CA2561743C - Lithium secondary battery with high power - Google Patents
Lithium secondary battery with high power Download PDFInfo
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- CA2561743C CA2561743C CA2561743A CA2561743A CA2561743C CA 2561743 C CA2561743 C CA 2561743C CA 2561743 A CA2561743 A CA 2561743A CA 2561743 A CA2561743 A CA 2561743A CA 2561743 C CA2561743 C CA 2561743C
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B7/00—Special arrangements or measures in connection with doors or windows
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- E06B7/22—Sealing arrangements on wings or parts co-operating with the wings by means of elastic edgings, e.g. elastic rubber tubes; by means of resilient edgings, e.g. felt or plush strips, resilient metal strips
- E06B7/23—Plastic, sponge rubber, or like strips or tubes
- E06B7/2305—Plastic, sponge rubber, or like strips or tubes with an integrally formed part for fixing the edging
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- C01G45/00—Compounds of manganese
- C01G45/12—Complex oxides containing manganese and at least one other metal element
- C01G45/1221—Manganates or manganites with trivalent manganese, tetravalent manganese or mixtures thereof
- C01G45/1242—Manganates or manganites with trivalent manganese, tetravalent manganese or mixtures thereof of the type (Mn2O4)-, e.g. LiMn2O4 or Li(MxMn2-x)O4
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- C01G51/00—Compounds of cobalt
- C01G51/40—Complex oxides containing cobalt and at least one other metal element
- C01G51/42—Complex oxides containing cobalt and at least one other metal element containing alkali metals, e.g. LiCoO2
- C01G51/44—Complex oxides containing cobalt and at least one other metal element containing alkali metals, e.g. LiCoO2 containing manganese
- C01G51/54—Complex oxides containing cobalt and at least one other metal element containing alkali metals, e.g. LiCoO2 containing manganese of the type (Mn2O4)-, e.g. Li(CoxMn2-x)O4 or Li(MyCoxMn2-x-y)O4
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- C01G53/00—Compounds of nickel
- C01G53/40—Complex oxides containing nickel and at least one other metal element
- C01G53/42—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2
- C01G53/44—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2 containing manganese
- C01G53/50—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2 containing manganese of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2
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- C01G53/42—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2
- C01G53/44—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2 containing manganese
- C01G53/54—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2 containing manganese of the type (Mn2O4)-, e.g. Li(NixMn2-x)O4 or Li(MyNixMn2-x-y)O4
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- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B7/00—Special arrangements or measures in connection with doors or windows
- E06B7/16—Sealing arrangements on wings or parts co-operating with the wings
- E06B7/22—Sealing arrangements on wings or parts co-operating with the wings by means of elastic edgings, e.g. elastic rubber tubes; by means of resilient edgings, e.g. felt or plush strips, resilient metal strips
- E06B7/23—Plastic, sponge rubber, or like strips or tubes
- E06B7/2314—Plastic, sponge rubber, or like strips or tubes characterised by the material
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/30—Three-dimensional structures
- C01P2002/32—Three-dimensional structures spinel-type (AB2O4)
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- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/40—Electric properties
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- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2600/00—Mounting or coupling arrangements for elements provided for in this subclass
- E05Y2600/60—Mounting or coupling members; Accessories therefor
- E05Y2600/626—Plates or brackets
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
- E05Y2800/10—Additional functions
- E05Y2800/12—Sealing
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The present invention provides a non-aqueous electrolyte-based high power lithium secondary battery having a long-term service life and superior safety at both room temperature and high temperature, even after repeated high-current charging and discharging, wherein the battery comprises a mixture of a particular lithium manganese-metal composite oxide (A) having a spinet structure and a particular lithium nickel-manganese-cobalt composite oxide (B) having a layered structure, as a cathode active material.
Description
LITHIUM SECONDARY BATTERY WITH HIGH POWER
FIELD OF THE INVENTION
The present invention relates to a non-aqueous electrolyte-based high power lithium secondary battery having a long-term service life and superior safety at both room temperature and high temperature, even after repeated high-current charge and discharge.
BACKGROUND OF THE INVENTION
Recently, strict control and regulation of vehicle emissions, in many countries including the USA and Europe, has accelerated development of electric vehicles (EVs) and hybrid electric vehicles (HEVs) using internal combustion engines and batteries as power sources, thereby partially entering commercialization.
Currently, batteries that can be utilized in EVs or HEVs are high power batteries and for example, Ni-MH secondary batteries, safety of which was verified, are commercially available. In addition, development of lithium secondary batteries having output density and energy density superior to Ni-MH secondary batteries is also actively underway.
However, lithium secondary batteries far use in EVs require not only high energy density and capability to exert Iarge power output within a short period of time, but also a long-term service life of more than 10 years even under severe conditions in which high current charge/discharge cycles are repeated within a short term, thus necessitating remarkably superior safety and long-term service life properties compared to conventional small-size lithium secondary batteries.
Lithium ion batteries that have been used in conventional small size batteries generally employ a layered structure of lithium cobalt composite oxide as a cathode material and graphite-based material as an anode material. However, the main constitutional element of the lithium cobalt composite oxide, cobalt, is very expensive and is not suitable for use in electric vehicles due to safety concerns.
Therefore, as the cathode material of lithium ion batteries for EVs, lithium manganese composite oxide having a spinet structure made up of manganese is ideal in terms of both cost and safety.
However, the lithium manganese composite oxide, upon high-temperature and high current chargeldischarge, undergoes elution of manganese ions into an electrolyte due to the influence of the electrolyte, thus resulting in degradation of battery properties and performance. Thus, there is a need for measures to prevent such problems. In addition, the lithium manganese composite oxide has drawbacks such low charge density as compared to conventional lithium cobalt composite oxide or lithium nickel composite oxide. Thus, there is a limit to charge density of the battery and in order to enter practical use as the powder source of EVs, HEVs, etc., specific designs of the battery to overcome such disadvantages should be effected together.
In order to alleviate the above-mentioned respective disadvantages, various studies and attempts to prepare electrodes using a mixed cathode active material have been made. For example, Japanese Patent Publication Laid-open Nos. 2002-110253 and 2003-168430 disclose techniques utilizing a mixture of lithium manganese oxide and/or lithium cobalt oxide, and lithium nickel-manganese-cobalt composite oxide (B) to
FIELD OF THE INVENTION
The present invention relates to a non-aqueous electrolyte-based high power lithium secondary battery having a long-term service life and superior safety at both room temperature and high temperature, even after repeated high-current charge and discharge.
BACKGROUND OF THE INVENTION
Recently, strict control and regulation of vehicle emissions, in many countries including the USA and Europe, has accelerated development of electric vehicles (EVs) and hybrid electric vehicles (HEVs) using internal combustion engines and batteries as power sources, thereby partially entering commercialization.
Currently, batteries that can be utilized in EVs or HEVs are high power batteries and for example, Ni-MH secondary batteries, safety of which was verified, are commercially available. In addition, development of lithium secondary batteries having output density and energy density superior to Ni-MH secondary batteries is also actively underway.
However, lithium secondary batteries far use in EVs require not only high energy density and capability to exert Iarge power output within a short period of time, but also a long-term service life of more than 10 years even under severe conditions in which high current charge/discharge cycles are repeated within a short term, thus necessitating remarkably superior safety and long-term service life properties compared to conventional small-size lithium secondary batteries.
Lithium ion batteries that have been used in conventional small size batteries generally employ a layered structure of lithium cobalt composite oxide as a cathode material and graphite-based material as an anode material. However, the main constitutional element of the lithium cobalt composite oxide, cobalt, is very expensive and is not suitable for use in electric vehicles due to safety concerns.
Therefore, as the cathode material of lithium ion batteries for EVs, lithium manganese composite oxide having a spinet structure made up of manganese is ideal in terms of both cost and safety.
However, the lithium manganese composite oxide, upon high-temperature and high current chargeldischarge, undergoes elution of manganese ions into an electrolyte due to the influence of the electrolyte, thus resulting in degradation of battery properties and performance. Thus, there is a need for measures to prevent such problems. In addition, the lithium manganese composite oxide has drawbacks such low charge density as compared to conventional lithium cobalt composite oxide or lithium nickel composite oxide. Thus, there is a limit to charge density of the battery and in order to enter practical use as the powder source of EVs, HEVs, etc., specific designs of the battery to overcome such disadvantages should be effected together.
In order to alleviate the above-mentioned respective disadvantages, various studies and attempts to prepare electrodes using a mixed cathode active material have been made. For example, Japanese Patent Publication Laid-open Nos. 2002-110253 and 2003-168430 disclose techniques utilizing a mixture of lithium manganese oxide and/or lithium cobalt oxide, and lithium nickel-manganese-cobalt composite oxide (B) to
-2-enhance recovery output. These techniques, however, suffer from problems associated with inferior cycle life span of the lithium manganese oxide and limited improvement of safety.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to solve the above problems, and other technical problems that have yet to be resolved.
Specifically, an object of the present invention is to provide a cathode active material for a secondary battery, comprising a mixture of a lithium manganese-metal composite oxide (A) having a spinel structure and composed of a particular metal element composition and a lithium nickel-manganese-cobalt composite oxide (B) having a layered structure and composed of a particular metal element composition, such that the cathode active material has superior safety and a long-term service life at both room temperature and high temperature due to improved properties of lithium manganese oxide, even after repeated high current charge and discharge.
Another object of the present invention is to provide a lithium secondary battery comprising the above-mentioned cathode active material. Such a lithium secondary battery may be preferably used as high power, large capacity batteries, in particular, for electric vehicles (EVs) and hybrid electric vehicles (HEVs).
In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a cathode active material for a secondary battery, comprising a lithium manganese-metal composite oxide (A) having a spinet structure and represented by the following General Formula 1 and a lithium
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to solve the above problems, and other technical problems that have yet to be resolved.
Specifically, an object of the present invention is to provide a cathode active material for a secondary battery, comprising a mixture of a lithium manganese-metal composite oxide (A) having a spinel structure and composed of a particular metal element composition and a lithium nickel-manganese-cobalt composite oxide (B) having a layered structure and composed of a particular metal element composition, such that the cathode active material has superior safety and a long-term service life at both room temperature and high temperature due to improved properties of lithium manganese oxide, even after repeated high current charge and discharge.
Another object of the present invention is to provide a lithium secondary battery comprising the above-mentioned cathode active material. Such a lithium secondary battery may be preferably used as high power, large capacity batteries, in particular, for electric vehicles (EVs) and hybrid electric vehicles (HEVs).
In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a cathode active material for a secondary battery, comprising a lithium manganese-metal composite oxide (A) having a spinet structure and represented by the following General Formula 1 and a lithium
-3-nickel-manganese-cobalt composite oxide (B) having a layered structure and represented by the following General Formula 2:
General Formula 1 Ll1+xMn2-x-yMy~4 wherein, 0 < x < 0.2;
0<y<O.l;and M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Ti, V, Zr and Zn.
General Formula 2 Lil_aNibMn~Co,-b_~02 wherein, -0.1 <_ a <_ 0.1;
0.3<b<0.5;and 0.3 < c < 0.5.
General Formula 1 Ll1+xMn2-x-yMy~4 wherein, 0 < x < 0.2;
0<y<O.l;and M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Ti, V, Zr and Zn.
General Formula 2 Lil_aNibMn~Co,-b_~02 wherein, -0.1 <_ a <_ 0.1;
0.3<b<0.5;and 0.3 < c < 0.5.
-4-In accordance with another aspect of the present invention, there is provided a lithium secondary battery comprising the above-mentioned cathode active material-containing cathode, an anode, a separator and an electrolyte.
Hereinafter, the present invention will be further described.
The present invention is characterized by use of a mixture of a lithium manganese-metal composite oxide (A), wherein a portion of manganese in the lithium manganese oxide having a spinet structure is substituted with other elements, and a lithium nickel-manganese-cobalt composite oxide (B) having a layered structure and a particular metal element composition, as the cathode active material.
Particularly, in the lithium nickel-manganese-cobalt composite oxide (B), the above-mentioned composition ratio ranges of nickel (Ni), manganese (Mn) and cobalt (Co), as will be clearly confirmed in the following examples and comparative examples, are essential with respect to high temperature cycle characteristics and capacity retention characteristics, and safety of the battery.
In the lithium manganese-metal composite oxide (A), among cathode active materials in accordance with the present invention, substitution of Mn with other metals (M=Al, Mg, Ni, Co, Fe, Ti, V, Zr or Zn) further improves high temperature cycle characteristics, as compared to the metal element-unsubstituted lithium manganese oxide. This is because substitution of Mn3'~ with other metals lowers the concentration of Mn3+ directly associated with dissolution of Mn at a high temperature, causing the Jahn-Teller effect, thereby forming a structurally stable oxide.
The metal (M) is preferably selected from the group consisting of Mg, Al, Co and Ni.
-S-In the lithium manganese-metal composite oxide (A), when x is greater than 0, lithium ions replace a portion of Mn3+, which leads to a decrease of a structurally unstable element, i.e., Mn3+, capable of causing the Jahn-Teller effect, and also inhibits elution of trivalent manganese into the electrolyte. On the other hand, where x is below 0, high-temperature cycle characteristics of the battery become poor. In addition, where x is greater than 0.2, the concentration of trivalent manganese ions involved in capacity of the active material remarkably decreases, in the lithium manganese-metal composite oxide (A), which in turn results in decreased charge density of the active material.
In any case, even though it is possible to improve high-temperature cycle characteristics and capacity retention characteristics of the battery, to some degree, by controlling the composition ratio of constitutional elements in the lithium manganese-metal composite oxide (A), there is a limit in respect to high-temperature stability and charge density of the battery. Therefore, the present invention employs, in admixture with the composite oxide (A), an active material, namely, lithium nickel-manganese-cobalt composite oxide (B), which is more stable and thus, it is expected, will increase service life.
The inventors of the present invention have found that the acidity (pH) increases as the weight ratio of lithium nickel-manganese-cobalt composite oxide (B) in such a mixed cathode active material increases. Therefore, it is assumed that such increase of pH assists in improving the service life of the battery by inhibiting elution of manganese ions due to the influence of the electrolyte in the battery, which was a disadvantage exhibited by the lithium manganese-metal composite oxide (A).
Upon considering safety and service life of the battery at high temperature, the pH
of the cathode active material is preferably in the range of 8.9 to 10.4.
Particularly, in order to secure acceptable battery safety, the mixing ratio between the lithium manganese-metal composite oxide (A) and lithium nickel-manganese-cobalt composite oxide (B) in the cathode active material of the present invention is preferably such that the lithium manganese-metal composite oxide (A) S exceeds 50% by weight. This fact can be confirmed in the following examples and comparative examples that will be illustrated below. More preferred mixing ratio is such that the weight ratio of the lithium manganese-metal composite oxide (A) is in the range of 80 to 95%, relative to the total mixture.
Methods of preparing lithium metal composite oxides by varying the composition of metal elements, such as the lithium manganese-metal composite oxide (A) and lithium nickel-manganese-cobalt composite oxide (B), are well known in the art and thus will not be described herein.
Further, in accordance with a further aspect of the present invention, there is provided a lithium secondary battery, comprising an electrode assembly composed of 1 S the above-mentioned cathode active material-containing cathode, an anode and a separator, and a non-aqueous electrolyte.
The lithium secondary battery in accordance with the present invention may be broadly divided into, for example, a jelly-roll type and stacking type, depending upon an electrode assembly form. In addition, the lithium secondary battery may be broadly divided into cylindrical, prismatic and pouch type batteries, depending upon the external shape thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 schematically shows a stacking type electrode assembly that can be used in the lithium secondary battery in accordance with the present invention;
FIG. 2 schematically shows a lithium secondary battery in which the stacking type electrode assembly of FIG. 1 is contained in a pouch type case;
FIG. 3 is a graph showing cycle life span characteristics at 50°C of batteries prepared in Examples 7 and 8, and Comparative Examples 3 and 4, respectively;
and FIG. 4 is a graph showing high current chargefdischarge cycle life span characteristics at room temperature of batteries prepared in Examples 11 and 15, and Comparative Examples 5 and 6, respectively.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The present invention will now be described in detail with reference to the preferred embodiments arid accompanying drawings.
FIG. 1 schematically illustrates an exemplary stacking type electrode assembly that can be used in the lithium secondary battery in accordance with the present invention, and FIG. 2 schematically illustrates an exemplary lithium secondary battery in which such a stacking type electrode assembly is contained in a pouch type case.
_g_ Referring to FIGS. 1 and 2, the stacking type electrode assembly has a structure in which a thin sheet-like cathode 1 and anode 2 are positioned adjacent to each other with a separator 3 placed therebetween. As the outer case for the battery, aluminum laminated sheets used in conventional lithium polymer batteries may be employed. The present invention may be applied to any internal structure type of batteries, regardless of stacking or winding type.
The cathode 1 is, for example, fabricated by applying a mixture of the cathode active material in accordance with the present invention, a conductive material and a binder to a cathode current collector, followed by drying. If desired, a filler may be further added to the above mixture.
The cathode current collector is generally fabricated to have a thickness of about 3 to 500 wm. There is no particular limit to cathode current collectors, so long as they have high conductivity without causing chemical changes -in the battery.
As examples of cathode current collectors, mention may be made of stainless steel, aluminum, nickel, titanium, sintered carbon, and aluminum or stainless steel surface-treated with carbon, nickel, titanium or silver. The current collector may be fabricated to have micro irregularities on the surface thereof so as to enhance adhesiveness to the cathode active material. In addition, the current collector may take various forms including films, sheets, foils, nets, porous structures, foams and non-woven fabrics.
The conductive material utilized in the present invention is typically added in an amount of 1 to 50°to by weight, based on the total weight of the mixture including the cathode active material. There is no particular limit to the conductive agent, so long as it has suitable conductivity without causing chemical changes in the battery.
As examples of conductive materials, mention may be made of graphite such as natural or artificial graphite; carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black and thermal black; conductive fibers such as carbon fibers and metal f hers; carbon fluoride; metal powder such as aluminum or nickel powder; conductive whiskers such as zinc oxide and potassium titanate;
conductive metal oxides such as titanium oxide; polyphenylene derivatives and the like.
The binder is an ingredient assisting in bonding between the active material and conductive material, and in binding to current collectors. The binder utilized in the present invention is typically added in an amount of 1 to 50% by weight, based on the total weight of the mixture including the cathode active material. As examples of the binder, mention may be made of polyfluorovinylidene, polyvinyl alcohols, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, recycled cellulose, polyvinyl pyrollidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-dime terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluoro rubber and various copolymers.
The filler is an ingredient that inhibits cathode expansion and is optionally employed. There is no particular limit to the filler, so long as it does not cause chemical changes in the battery and is also a fibrous material. As examples of the filler, there may be used olefin polymers such as polyethylene and polypropylene; and fibrous materials such as glass fiber and caxbon fiber.
The anode 2 is fabricated by applying an anode material to an anode current collector, followed by drying. If necessary, other components such as conductive materials and binders, as described above, may be further added.
The anode current collector is generally fabricated to have a thickness of 3 to 500 Vim. There is no particular limit to anode current collectors, so long as they have suitable conductivity without causing chemical changes in the battery. As examples of anode current collectors, mention may be made of copper, stainless steel, aluminum, nickel, titanium, sintered carbon, copper or stainless steel surface-treated with carbon, nickel, titanium or silver, and aluminum-cadmium alloys. Similar to the cathode S current collector, the anode current collector may also be fabricated to form micro irregularities on the surface thereof so as to enhance adhesiveness to the anode active material. In addition, the anode current collector may take various forms including films, sheets, foils, nets, porous structures, foams and non-woven fabrics.
As examples of the anode active materials utilizable in the present invention, mention may be made of carbon such as non-graphitizing carbon and graphite-based carbon; metal composite oxides such as LiXFe203 (0<_x_1), LixW02 (0<_x<_1) and SnXMeI_XMe'YOZ (Me: Mn, Fe, Pb, Ge; Me': Al, B, P, Si, group I, II and III
elements of the Periodic Table, halogen atoms; 0<x51; 1 <y53; 1 Sz58); lithium metals;
lithium alloys; silicon-based alloys; tin alloys; metal oxides such as SnO, Sn02, PbO, Pb02, Pb203, Pb304, Sb2O3, Sb2O4, Sb2O5, GeO, Ge02, Bi2O3, Bi2O4, and Bi2Os;
conductive polymers such as polyacetylene; and Li-Co-Ni-based materials.
The separator 3 is disposed between the cathode 1 and anode 2. As the separator, an insulating thin film having high ion permeability and mechanical strength is used. The separator typically has a pore diameter of 0.01 to 10 win and a thickness of
Hereinafter, the present invention will be further described.
The present invention is characterized by use of a mixture of a lithium manganese-metal composite oxide (A), wherein a portion of manganese in the lithium manganese oxide having a spinet structure is substituted with other elements, and a lithium nickel-manganese-cobalt composite oxide (B) having a layered structure and a particular metal element composition, as the cathode active material.
Particularly, in the lithium nickel-manganese-cobalt composite oxide (B), the above-mentioned composition ratio ranges of nickel (Ni), manganese (Mn) and cobalt (Co), as will be clearly confirmed in the following examples and comparative examples, are essential with respect to high temperature cycle characteristics and capacity retention characteristics, and safety of the battery.
In the lithium manganese-metal composite oxide (A), among cathode active materials in accordance with the present invention, substitution of Mn with other metals (M=Al, Mg, Ni, Co, Fe, Ti, V, Zr or Zn) further improves high temperature cycle characteristics, as compared to the metal element-unsubstituted lithium manganese oxide. This is because substitution of Mn3'~ with other metals lowers the concentration of Mn3+ directly associated with dissolution of Mn at a high temperature, causing the Jahn-Teller effect, thereby forming a structurally stable oxide.
The metal (M) is preferably selected from the group consisting of Mg, Al, Co and Ni.
-S-In the lithium manganese-metal composite oxide (A), when x is greater than 0, lithium ions replace a portion of Mn3+, which leads to a decrease of a structurally unstable element, i.e., Mn3+, capable of causing the Jahn-Teller effect, and also inhibits elution of trivalent manganese into the electrolyte. On the other hand, where x is below 0, high-temperature cycle characteristics of the battery become poor. In addition, where x is greater than 0.2, the concentration of trivalent manganese ions involved in capacity of the active material remarkably decreases, in the lithium manganese-metal composite oxide (A), which in turn results in decreased charge density of the active material.
In any case, even though it is possible to improve high-temperature cycle characteristics and capacity retention characteristics of the battery, to some degree, by controlling the composition ratio of constitutional elements in the lithium manganese-metal composite oxide (A), there is a limit in respect to high-temperature stability and charge density of the battery. Therefore, the present invention employs, in admixture with the composite oxide (A), an active material, namely, lithium nickel-manganese-cobalt composite oxide (B), which is more stable and thus, it is expected, will increase service life.
The inventors of the present invention have found that the acidity (pH) increases as the weight ratio of lithium nickel-manganese-cobalt composite oxide (B) in such a mixed cathode active material increases. Therefore, it is assumed that such increase of pH assists in improving the service life of the battery by inhibiting elution of manganese ions due to the influence of the electrolyte in the battery, which was a disadvantage exhibited by the lithium manganese-metal composite oxide (A).
Upon considering safety and service life of the battery at high temperature, the pH
of the cathode active material is preferably in the range of 8.9 to 10.4.
Particularly, in order to secure acceptable battery safety, the mixing ratio between the lithium manganese-metal composite oxide (A) and lithium nickel-manganese-cobalt composite oxide (B) in the cathode active material of the present invention is preferably such that the lithium manganese-metal composite oxide (A) S exceeds 50% by weight. This fact can be confirmed in the following examples and comparative examples that will be illustrated below. More preferred mixing ratio is such that the weight ratio of the lithium manganese-metal composite oxide (A) is in the range of 80 to 95%, relative to the total mixture.
Methods of preparing lithium metal composite oxides by varying the composition of metal elements, such as the lithium manganese-metal composite oxide (A) and lithium nickel-manganese-cobalt composite oxide (B), are well known in the art and thus will not be described herein.
Further, in accordance with a further aspect of the present invention, there is provided a lithium secondary battery, comprising an electrode assembly composed of 1 S the above-mentioned cathode active material-containing cathode, an anode and a separator, and a non-aqueous electrolyte.
The lithium secondary battery in accordance with the present invention may be broadly divided into, for example, a jelly-roll type and stacking type, depending upon an electrode assembly form. In addition, the lithium secondary battery may be broadly divided into cylindrical, prismatic and pouch type batteries, depending upon the external shape thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 schematically shows a stacking type electrode assembly that can be used in the lithium secondary battery in accordance with the present invention;
FIG. 2 schematically shows a lithium secondary battery in which the stacking type electrode assembly of FIG. 1 is contained in a pouch type case;
FIG. 3 is a graph showing cycle life span characteristics at 50°C of batteries prepared in Examples 7 and 8, and Comparative Examples 3 and 4, respectively;
and FIG. 4 is a graph showing high current chargefdischarge cycle life span characteristics at room temperature of batteries prepared in Examples 11 and 15, and Comparative Examples 5 and 6, respectively.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The present invention will now be described in detail with reference to the preferred embodiments arid accompanying drawings.
FIG. 1 schematically illustrates an exemplary stacking type electrode assembly that can be used in the lithium secondary battery in accordance with the present invention, and FIG. 2 schematically illustrates an exemplary lithium secondary battery in which such a stacking type electrode assembly is contained in a pouch type case.
_g_ Referring to FIGS. 1 and 2, the stacking type electrode assembly has a structure in which a thin sheet-like cathode 1 and anode 2 are positioned adjacent to each other with a separator 3 placed therebetween. As the outer case for the battery, aluminum laminated sheets used in conventional lithium polymer batteries may be employed. The present invention may be applied to any internal structure type of batteries, regardless of stacking or winding type.
The cathode 1 is, for example, fabricated by applying a mixture of the cathode active material in accordance with the present invention, a conductive material and a binder to a cathode current collector, followed by drying. If desired, a filler may be further added to the above mixture.
The cathode current collector is generally fabricated to have a thickness of about 3 to 500 wm. There is no particular limit to cathode current collectors, so long as they have high conductivity without causing chemical changes -in the battery.
As examples of cathode current collectors, mention may be made of stainless steel, aluminum, nickel, titanium, sintered carbon, and aluminum or stainless steel surface-treated with carbon, nickel, titanium or silver. The current collector may be fabricated to have micro irregularities on the surface thereof so as to enhance adhesiveness to the cathode active material. In addition, the current collector may take various forms including films, sheets, foils, nets, porous structures, foams and non-woven fabrics.
The conductive material utilized in the present invention is typically added in an amount of 1 to 50°to by weight, based on the total weight of the mixture including the cathode active material. There is no particular limit to the conductive agent, so long as it has suitable conductivity without causing chemical changes in the battery.
As examples of conductive materials, mention may be made of graphite such as natural or artificial graphite; carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black and thermal black; conductive fibers such as carbon fibers and metal f hers; carbon fluoride; metal powder such as aluminum or nickel powder; conductive whiskers such as zinc oxide and potassium titanate;
conductive metal oxides such as titanium oxide; polyphenylene derivatives and the like.
The binder is an ingredient assisting in bonding between the active material and conductive material, and in binding to current collectors. The binder utilized in the present invention is typically added in an amount of 1 to 50% by weight, based on the total weight of the mixture including the cathode active material. As examples of the binder, mention may be made of polyfluorovinylidene, polyvinyl alcohols, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, recycled cellulose, polyvinyl pyrollidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-dime terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluoro rubber and various copolymers.
The filler is an ingredient that inhibits cathode expansion and is optionally employed. There is no particular limit to the filler, so long as it does not cause chemical changes in the battery and is also a fibrous material. As examples of the filler, there may be used olefin polymers such as polyethylene and polypropylene; and fibrous materials such as glass fiber and caxbon fiber.
The anode 2 is fabricated by applying an anode material to an anode current collector, followed by drying. If necessary, other components such as conductive materials and binders, as described above, may be further added.
The anode current collector is generally fabricated to have a thickness of 3 to 500 Vim. There is no particular limit to anode current collectors, so long as they have suitable conductivity without causing chemical changes in the battery. As examples of anode current collectors, mention may be made of copper, stainless steel, aluminum, nickel, titanium, sintered carbon, copper or stainless steel surface-treated with carbon, nickel, titanium or silver, and aluminum-cadmium alloys. Similar to the cathode S current collector, the anode current collector may also be fabricated to form micro irregularities on the surface thereof so as to enhance adhesiveness to the anode active material. In addition, the anode current collector may take various forms including films, sheets, foils, nets, porous structures, foams and non-woven fabrics.
As examples of the anode active materials utilizable in the present invention, mention may be made of carbon such as non-graphitizing carbon and graphite-based carbon; metal composite oxides such as LiXFe203 (0<_x_1), LixW02 (0<_x<_1) and SnXMeI_XMe'YOZ (Me: Mn, Fe, Pb, Ge; Me': Al, B, P, Si, group I, II and III
elements of the Periodic Table, halogen atoms; 0<x51; 1 <y53; 1 Sz58); lithium metals;
lithium alloys; silicon-based alloys; tin alloys; metal oxides such as SnO, Sn02, PbO, Pb02, Pb203, Pb304, Sb2O3, Sb2O4, Sb2O5, GeO, Ge02, Bi2O3, Bi2O4, and Bi2Os;
conductive polymers such as polyacetylene; and Li-Co-Ni-based materials.
The separator 3 is disposed between the cathode 1 and anode 2. As the separator, an insulating thin film having high ion permeability and mechanical strength is used. The separator typically has a pore diameter of 0.01 to 10 win and a thickness of
5 to 300 Vim. As separators that can be used in the present invention, mention may be made of olefin polymers such as chemically resistant and hydrophobic polypropylene;
and sheets or non-woven fabrics made of glass fiber or polyethylene. When a solid electrolyte such as a polymer is employed as the electrolyte, the solid electrolyte may also serve as both the separator and electrolyte.
The non-aqueous electrolyte containing lithium salt is composed of a non-aqueous electrolyte and lithium. As the non-aqueous electrolyte, a non-aqueous electrolyte solution, organic solid electrolyte, inorganic solid electrolyte, etc. may be utilized.
As the non-aqueous electrolyte solution, for example, mention may be made of non-protic organic solvents such as N-methyl-2-pyrollidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma-butyro lactone, 1,2-dimethoxy ethane, tetrahydro Franc, 2-methyl tetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane, acetonitrile, nitromethane, methyl formate, methyl acetate, phosphoric acid triester, trimethoxy methane, dioxolane derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, ether, methyl propionate, ethyl propionate, etc.
As examples of the organic solid electrolyte utilized in the present invention, mention may be made of polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate polymers, poly agitation lysine, polyester sulfone, polyvinyl alcohol, poly(vinylidene fluoride), polymers containing ionic dissociation groups, etc.
As examples of the inorganic solid electrolyte utilized in the present invention, mention may be made of nitrides, halides and sulphates of lithium such as Li3N, LiI, Li5NI2, Li3N-LiI-LiOH, LiSiOa, LiSi04-LiI-LiOH, Li2SiS3, Li4SiOa, Li4Si04-LiI-LiOH, Li3P04-LiZS-SiS2, etc.
The lithium salt is a material that is readily soluble in non-aqueous electrolyte and may include, for example, LiCI, Liar, LiI, LiC104, LiBF4, LiBIQCIio, LiPF6, LiCF3S03, LiCF3C02, LiAsF6, LiSbF6, LiA1C14, CH3S03Li, CF3S03Li, (CF3S02)2NLi, lithium chloroborate, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate, imide, etc.
Additionally, in order to improve charge/discharge characteristics and flame retardancy, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexamethylphosphoric triamide, nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinone, N,N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salts, pyrrole, 2-methoxy ethanol, aluminum trichloride and the like may be added to the non-aqueous electrolyte. If necessary, in order to impart incombustibility, the non-aqueous electrolyte may further include halogen-containing solvents such as carbon tetrachloride and ethylene trifluoride. In addition, the non-aqueous electrolyte may further include carbon dioxide gas in order to improve high temperature preservability.
EXAMPLES
I S Now, the present invention will be described in more detail with reference to the following Examples. These examples are provided only for illustrating the present invention and should not be construed as limiting the scope and sprit of the present invention.
Example 1 Lithium manganese-metal composite oxide (A) of Li,,iMnl,BSAlo.osOa ~d lithium nickel-manganese-cobalt composite oxide (B) of LiNio,4Mno,4Coo,202 were mixed in a weight ratio of 90:10. 1.25 g of the resulting mixture was added to 25 mL of triple distilled water, which was then subjected to ultra-sonication for 30 min, followed by measuring pH using a pH meter. The results are shown in Table 1 below.
Examples 2 through 5 Experiments were repeated using the same procedure as in Example 1, except that the mixing ratio of Lil,lMnI,BSAIo.os~a to LiNio,4Mno,4Coo.202 was varied, and the pH of the thus-obtained product was measured. The results are shown in Table 1 below.
Comparative Example 1 An experiment was repeated using the same procedure as in Example 1, except that the mixing ratio (by weight) of Lil,iMy.ssAlo.os~a to LiNio,aMno,aCoo,202 was 100:0, and the pH of the thus-obtained product was measured. The results are shown in Table 1 below.
Comparative Example 2 An experiment was repeated using the same procedure as in Example 1, except that the mixing ratio (by weight) of, Lil,lMnl.as~'~lo.os~a to LiNio,4Mno.4Coo,202 was 0:100, and the pH of the thus-obtained product was measured. The results are shown in Table 1 below.
[Table 1 ]
Mixing weight ratio of I pH
LiLiMW .ssAlo.osDa to LiNio.aMl'~o.aCoo.2~z Example 1 90:10 9.8 Example 2 80:20 10.2 Example 3 50:50 10.4 Example 4 30:70 10.6 Example 5 20:80 10.7 Comp. Example 1 100:0 8.9 Comp. Example 2 0:100 10.9 Example 6 In the same manner as in Example 1, LiI.IMn1.85Alo.osDa ~d LiNio.aMno.aCoo.202 were mixed in a weight ratio of 90:10 to prepare a cathode active material. The cathode active material, carbon black and, as a binder, polyvinylidene fluoride (PVDF), in a weight ratio of 85:10:5 were mixed in an organic solvent, NMP, to prepare a slurry. The resulting slurry was applied to both sides of aluminum foil having a thickness of 20 ~m and dried to prepare a cathode. A button type battery was assembled using the thus-prepared cathode, a lithium metal as an anode, a porous polyethylene film as a separator, and a 1M LiPF6 EC/EMC solution as an electrolyte.
In order to evaluate high-temperature service life of the thus-prepared battery, the battery was subjected to 50 charge/discharge cycles at a current density of 0.2 C and a temperature of 50°C. Discharge capacity retention rate of the battery was calculated according to the following Equation 1. The results are shown in Table 2 below.
E4uation 1 Discharge capacity retention rate (%) _ (discharge capacity after 100 charge/discharge cycles l discharge capacity after 1 chargeldischarge cycle) x 100 * Note: 100 chargeldischarge cycles is set to find optimal condition for relative comparison.
Examples 7 through 10 Batteries were assembled using the same procedure as in Example 6, except that the mixing ratio (by weight) of Li~,~Mnl,8sAlo,osGa to LiNio.4Mno.aCoo.2G2 was controlled as listed in Table 2 below, and high temperature service life of the batteries was evaluated. The results are shown in Table 2 below and FIG. 3, respectively.
Comparative Example 3 A battery was assembled using the same procedure as in Example 6, except that the mixing ratio (by weight) of Lil.lMnl.asAlo.os~a to LiNio.aMno.aCoo.242 was 100:0, and high temperature service life of the battery was evaluated. The results are shown in Table 2 below and FIG. 3, respectively.
Comparative Examt~le 4 A battery was assembled using the same procedure as in Example 6, except that the mixing ratio (by weight) of Li~,~Mnl.gsAlo.os~a to LiNio,4Mno,4Coo.202 was 0:100, and high temperature service life of the battery was evaluated. The results are shown in Table 2 below and FIG. 3, respectively.
[Table 2]
Mixing weight Discharge Capacity ratio of Lil.,Mnl.ssAlo.os4acapacity increase Capacity relative to retention to Li per gram LiNio rate(%) manganese-4Mno,4Coo.202 after . 100 cycles(fig) metal composite in cathode activeat material 50C oxide (A) (%) Example 90:10 93 111.7 6.2
and sheets or non-woven fabrics made of glass fiber or polyethylene. When a solid electrolyte such as a polymer is employed as the electrolyte, the solid electrolyte may also serve as both the separator and electrolyte.
The non-aqueous electrolyte containing lithium salt is composed of a non-aqueous electrolyte and lithium. As the non-aqueous electrolyte, a non-aqueous electrolyte solution, organic solid electrolyte, inorganic solid electrolyte, etc. may be utilized.
As the non-aqueous electrolyte solution, for example, mention may be made of non-protic organic solvents such as N-methyl-2-pyrollidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma-butyro lactone, 1,2-dimethoxy ethane, tetrahydro Franc, 2-methyl tetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane, acetonitrile, nitromethane, methyl formate, methyl acetate, phosphoric acid triester, trimethoxy methane, dioxolane derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, ether, methyl propionate, ethyl propionate, etc.
As examples of the organic solid electrolyte utilized in the present invention, mention may be made of polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate polymers, poly agitation lysine, polyester sulfone, polyvinyl alcohol, poly(vinylidene fluoride), polymers containing ionic dissociation groups, etc.
As examples of the inorganic solid electrolyte utilized in the present invention, mention may be made of nitrides, halides and sulphates of lithium such as Li3N, LiI, Li5NI2, Li3N-LiI-LiOH, LiSiOa, LiSi04-LiI-LiOH, Li2SiS3, Li4SiOa, Li4Si04-LiI-LiOH, Li3P04-LiZS-SiS2, etc.
The lithium salt is a material that is readily soluble in non-aqueous electrolyte and may include, for example, LiCI, Liar, LiI, LiC104, LiBF4, LiBIQCIio, LiPF6, LiCF3S03, LiCF3C02, LiAsF6, LiSbF6, LiA1C14, CH3S03Li, CF3S03Li, (CF3S02)2NLi, lithium chloroborate, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate, imide, etc.
Additionally, in order to improve charge/discharge characteristics and flame retardancy, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexamethylphosphoric triamide, nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinone, N,N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salts, pyrrole, 2-methoxy ethanol, aluminum trichloride and the like may be added to the non-aqueous electrolyte. If necessary, in order to impart incombustibility, the non-aqueous electrolyte may further include halogen-containing solvents such as carbon tetrachloride and ethylene trifluoride. In addition, the non-aqueous electrolyte may further include carbon dioxide gas in order to improve high temperature preservability.
EXAMPLES
I S Now, the present invention will be described in more detail with reference to the following Examples. These examples are provided only for illustrating the present invention and should not be construed as limiting the scope and sprit of the present invention.
Example 1 Lithium manganese-metal composite oxide (A) of Li,,iMnl,BSAlo.osOa ~d lithium nickel-manganese-cobalt composite oxide (B) of LiNio,4Mno,4Coo,202 were mixed in a weight ratio of 90:10. 1.25 g of the resulting mixture was added to 25 mL of triple distilled water, which was then subjected to ultra-sonication for 30 min, followed by measuring pH using a pH meter. The results are shown in Table 1 below.
Examples 2 through 5 Experiments were repeated using the same procedure as in Example 1, except that the mixing ratio of Lil,lMnI,BSAIo.os~a to LiNio,4Mno,4Coo.202 was varied, and the pH of the thus-obtained product was measured. The results are shown in Table 1 below.
Comparative Example 1 An experiment was repeated using the same procedure as in Example 1, except that the mixing ratio (by weight) of Lil,iMy.ssAlo.os~a to LiNio,aMno,aCoo,202 was 100:0, and the pH of the thus-obtained product was measured. The results are shown in Table 1 below.
Comparative Example 2 An experiment was repeated using the same procedure as in Example 1, except that the mixing ratio (by weight) of, Lil,lMnl.as~'~lo.os~a to LiNio,4Mno.4Coo,202 was 0:100, and the pH of the thus-obtained product was measured. The results are shown in Table 1 below.
[Table 1 ]
Mixing weight ratio of I pH
LiLiMW .ssAlo.osDa to LiNio.aMl'~o.aCoo.2~z Example 1 90:10 9.8 Example 2 80:20 10.2 Example 3 50:50 10.4 Example 4 30:70 10.6 Example 5 20:80 10.7 Comp. Example 1 100:0 8.9 Comp. Example 2 0:100 10.9 Example 6 In the same manner as in Example 1, LiI.IMn1.85Alo.osDa ~d LiNio.aMno.aCoo.202 were mixed in a weight ratio of 90:10 to prepare a cathode active material. The cathode active material, carbon black and, as a binder, polyvinylidene fluoride (PVDF), in a weight ratio of 85:10:5 were mixed in an organic solvent, NMP, to prepare a slurry. The resulting slurry was applied to both sides of aluminum foil having a thickness of 20 ~m and dried to prepare a cathode. A button type battery was assembled using the thus-prepared cathode, a lithium metal as an anode, a porous polyethylene film as a separator, and a 1M LiPF6 EC/EMC solution as an electrolyte.
In order to evaluate high-temperature service life of the thus-prepared battery, the battery was subjected to 50 charge/discharge cycles at a current density of 0.2 C and a temperature of 50°C. Discharge capacity retention rate of the battery was calculated according to the following Equation 1. The results are shown in Table 2 below.
E4uation 1 Discharge capacity retention rate (%) _ (discharge capacity after 100 charge/discharge cycles l discharge capacity after 1 chargeldischarge cycle) x 100 * Note: 100 chargeldischarge cycles is set to find optimal condition for relative comparison.
Examples 7 through 10 Batteries were assembled using the same procedure as in Example 6, except that the mixing ratio (by weight) of Li~,~Mnl,8sAlo,osGa to LiNio.4Mno.aCoo.2G2 was controlled as listed in Table 2 below, and high temperature service life of the batteries was evaluated. The results are shown in Table 2 below and FIG. 3, respectively.
Comparative Example 3 A battery was assembled using the same procedure as in Example 6, except that the mixing ratio (by weight) of Lil.lMnl.asAlo.os~a to LiNio.aMno.aCoo.242 was 100:0, and high temperature service life of the battery was evaluated. The results are shown in Table 2 below and FIG. 3, respectively.
Comparative Examt~le 4 A battery was assembled using the same procedure as in Example 6, except that the mixing ratio (by weight) of Li~,~Mnl.gsAlo.os~a to LiNio,4Mno,4Coo.202 was 0:100, and high temperature service life of the battery was evaluated. The results are shown in Table 2 below and FIG. 3, respectively.
[Table 2]
Mixing weight Discharge Capacity ratio of Lil.,Mnl.ssAlo.os4acapacity increase Capacity relative to retention to Li per gram LiNio rate(%) manganese-4Mno,4Coo.202 after . 100 cycles(fig) metal composite in cathode activeat material 50C oxide (A) (%) Example 90:10 93 111.7 6.2
6 Example 80:20 93.7 117.5 11.7
7 Example 50:50 94.3 134.0 27.4
8 Example 30:70 94.9 149.1 41.7
9 Example 20:80 95.3 156.6 48.9 Comp. 100:0 91.2 105.2 0 Example Comp. p;100 95.7 168.2 59.9 Example 5 As can be seen from Tables 1 and 2, upon mixing the lithium manganese-metal composite oxide (A) of Li i+XMn2-X-yMyGa ~d the lithium nickel-manganese-cobalt composite oxide (B) of Lil_aNibMn~Co~_b_°02, a pH of the cathode active material increases as the mixing ratio of the composite oxide (B) increases. It is believed that such an increase of pH inhibits elution of manganese ions from the spinel structure
10 composite oxide (A) into the electrolyte, thereby leading to increased service life of the battery at high temperatures. In addition, it can be seen that due to admixing with the lithium nickel-manganese-cobalt composite oxide (B), it is also possible to solve problems associated with low charge density, disadvantageously exhibited by the spinet -1?-structure lithium manganese-metal composite oxide (A). Although the cathode active material of Comparative Example 4 exhibits superior discharge capacity retention, this active material suffers from safety problems, as will be seen from Comparative Example 6.
Example 11 A lithium manganese-metal composite oxide (A) of Li,,~Mnl.gsMgo.osGa ~d lithium nickel-manganese-cobalt composite oxide (B) of LiNili3Mn1i3Co1i302 were used in a weight ratio of 90:10 to prepare a cathode active material. The cathode active material, carbon black and as a binder, PVDF in a weight ratio of 85:10:5 were mixed in an organic solvent, NMP to prepare a slurry. The resulting slurry was applied to both sides of aluminum foil having a thickness of 20 ~cm and dried to prepare a cathode.
Spherical artificial graphite powder having high crystallinity and average particle size of 12 ~tm and the binder, PVDF were mixed in a weight ratio of 90:10, and then admixed in NMP to prepare a slurry. The resulting slurry was applied to copper foil having a thickness of 10 ~m and dried, followed by roll pressing to a thickness of 60 ~m so as to prepare an anode.
A stacked type lithium battery, as shown in FIG. 1, was fabricated using the thus-prepared cathode and anode, and a 1 M LiPF6 EC/EMC solution as an electrolyte.
When the lithium metal is used as the anode, it is difficult to confirm high power output higher than 5 C, due to slow diffusion rate of the lithium metal.
Therefore, using carbon as the anode, life span performance of the battery upon charge/discharge with high current pulse was tested.
In order to evaluate the life span performance of the battery upon charge/discharge with high current pulse, a large number of charge/discharge were repeated with current of SOA at room temperature and 40 to 60% DOD (Depth Of Discharge). High current charge/discharge discharge capacity retention rate of the S battery was calculated according to the following Equation 2. The results are shown in Table 3 below and FIG. 4, respectively:
Eauation High current charge/discharge discharge capacity retention rate (%) _ (discharge capacity at initial current density of 1 C l discharge capacity at current density of 1 C
after 50 A cycle charge/discharge) x 100 In addition, the battery safety was tested. The results are shown in Table 4 below. Safety testing of the battery was carried out by overcharging the battery to SOC
(State Of Charge) of 200 or 20 volts by high current of 32 A and confirming the presence of battery firing.
Examples 12 through 1 S
Batteries were assembled using the same procedure as in Example 11, except that a mixing ratio (by weight) of Li1_lMn1.85Mgo.os~a to L1N11i3Mri,i3C0,/3O2 was varied. High current pulse charge/discharge life span performance (high load discharge rate) of the batteries was evaluated and safety testing of the batteries was also carried out. The results are shown in the following Tables 3 and 4, and FIG. 4, respectively.
Comparative Example 5 A battery was assembled using the same procedure as in Example 11, except that the mixing ratio (by weight) of Lil.lMn,.gsMgo.os0a to LiNili3Mn1i3Co~i302 was 100:0. High current pulse charge/discharge life span performance (high load discharge rate) of the battery was evaluated and safety testing of the battery was carried out. The results are shown in the following Tables 3 and 4, and FIG. 4, respectively.
Comparative Example 6 A battery was assembled using the same procedure as in Example 11, except that the mixing ratio (by weight) of Lil.lMnl.asMgo.osGa to LiNil~3Mn»Co~i302 was 0:100. High current pulse charge/discharge life span performance (high load discharge rate) of the battery was evaluated and safety testing of the battery was carried out. The results are shown in the following Tables 3 and 4, and FIG. 4, respectively.
[Table 3]
Mixing weight ratio DischargeDischargeDischarge Discharge of Initial capacity capacity capacity capacity Lii.~MnI.BSMgo.os~adischarge retentionretentionretention retention to capacity rate (%) rate (%) rate (%) rate (%) LiNili3Mnv3Co,~02retentionafter after after 20000after in cathode activerate (%) cycles cycles cycles cycles material Example 11 (90:10)100 92 86 82 78 Example 12 (80:20)100 93 86 84 79 Example 13 (50:50)100 94 89 85 81 Example 14 (30:70)100 96 89 86 83 Example 1 S 100 96 91 87 82 (20:80) Comp. Example 100 92 82 75 73 ( 100:0) Comp. Example (0:100) As can be seen from Table 3, upon mixing the lithium manganese-metal composite oxide (A) and the lithium nickel-manganese-cobalt composite oxide (B), a high current charge/discharge life span of the battery increases as the mixing ratio of the 5 lithium nickel-manganese-cobalt composite oxide (B) increases. This is believed due to that, even though high current charge/discharge of the lithium secondary battery results in elevated temperature of the battery, a mixed electrode of the spinel structure lithium manganese-metal composite oxide (A) and layered structure lithium nickel-manganese-cobalt composite oxide (B) has a high pH and basically stable structure at high temperature, thereby having effects on increase of battery life span, as also shown in preceding examples.
[Table 4]
Mixing weight ratio of Lil.lMn1,85Mgo.osOa to Overcharge LiNiji3Mn,i3Co,i302 in cathode active material Example 11 90:10 No fire Example 12 80:20 No fire Example 13 50:50 Fire Example 14 30:70 Fire Example 15 20:80 Fire Comp. Example 100:0 No fire Comp. Example 0:100 Fire From the results of Table 4, it can be seen that in the weight mixing ratio of the lithium manganese-metal composite oxide (A) and lithium nickel-manganese-cobalt composite oxide (B), battery safety can be secured when the proportion of the composite oxide (A) exceeds 50%. This effect is believed due to safety of the spinel structure lithium manganese-metal composite oxide (A). Although, the cathode active material of Comparative Example 5 exhibited superior safety due to no fire in experiments, it suffers from a problem associated with low discharge capacity retention rate after charge/discharge cycles, as can be seen from Table 3.
Example 16 A battery was assembled using the same procedure as in Example 6, except that LiI.oBMn~,g~Alo.os~a was used as the lithium manganese-metal composite oxide (A), instead of Li,,~Mn1.85Alo.os~a~ and high temperature service life of the battery was evaluated. The results are shown in Table 5 below.
Comparative Example 7 A battery was assembled using the same procedure as in Example 16, except that LiI.oBMn~,920~ was used as the lithium manganese-metal composite oxide (A), instead of Lii.o8Mn1.8~Alo,osDa~ ~d high temperature service life of the battery was evaluated. The results are shown in Table 5.
[Table 5) Discharge capacity retention rate I Capacity /gram after 100 cycles at 50C (fig) (%) Example 16 92.3 104.3 Comp. Example 87.8 105.3 As can be seen from Table 5, due to substitution of Mn with other metal M, the lithium manganese-metal composite oxide (A) of Lit+xMnz-X-yMyOa [provided, 0<x<_0.2, 0<y<_0.1, and M is at least one element selected from the group consisting of Al, Mg, S Ni, Co, Fe, Ti, V, Zr and Zn] is more stable at high temperatures than the spinet structure Lil+XMnz-XOa (provided, 0<x<0.2) lithium manganese oxide without substitution of metal element. This is believed due to that the lithium manganese-metal composite oxide (A) in which Mn was substituted with other metal M results in relatively reduced elution of manganese ions at high temperatures, as compared to the lithium manganese oxide without substitution of metal element.
Examt~les 17 and 18 A cathode was prepared using the same procedure as in Example 11, except that in a lithium nickel-manganese-cobalt composite oxide (B) of Li,_aNibMn~Coi-b-X02, the composition ratio of nickel, cobalt, and manganese was controlled as described in Table 6 below. In order to verify safety of the cathode active material, DSC
(Differential Scanning Calorimetry) was performed. Onset temperature and calorie are shown in Table 6 below.
Comparative Examples 8 through 10 Experiments were repeated using the same procedure as in Example 11, except that in a lithium nickel-manganese-cobalt composite oxide (B) of Li~_aNibMn~Co,_b-c02, a composition ratio of nickel, cobalt and manganese was controlled as described in Table 6 below. The results are shown in Table 6 below.
[Table 6]
Ni~b~ Mn~~? CO(1-b-c)Tonset Delta H
Example 17 0.33 0.33 0.33 220 67 Example 18 0.4 0.4 0.2 260 SS
Comp. Example 0.15 0.15 0.7 190 210 Comp. Example 0 0 100 170 273 Comp. Example 0.5 0.5 0 290 48 As can be seen from Table 6, as the ratio of manganese increases and correspondingly the ratio of cobalt decreases in the lithium nickel-manganese-cobalt 10 composite oxide (B), onset temperature rises and calorie remarkably decreases. In particular, such changes are prominent when the composition of manganese is about 0.3. This fact means that safety of the cathode is improved because manganese in the material is less reactive at high temperature, as compared to cobalt. Although the cathode active material of Comparative Example 10 exhibits results of high onset temperature and low calorie, such an active material has high nickel content, thus disadvantageously causing swelling of the battery.
Example 19 A battery was assembled using the same procedure as in Example 11, except that a cathode active material was prepared using the lithium manganese-metal composite oxide (A) of Li~,~MnI,BSMgo.osOa and lithium nickel-manganese-cobalt composite oxide (B) of LiNiti3Mn1i3Co1i302 in a mixing ratio of 70:30, and safety testing of the battery was then carried out. The results are shown in Table 7 below.
Comparative Examt~le 11 A battery was assembled using the same procedure as in Example 11, except that a cathode active material was prepared using the lithium manganese-metal composite oxide (A) of Lil.~MnI.BSMgo.osOa ~d lithium nickel-manganese-cobalt composite oxide (B) of LiNio,lsMno.~sCooaOa in a mixing ratio of 70:30 and safety testing of the battery was carried out. The results are shown in Table 7 below.
Comparative Example 12 A battery was assembled using the same procedure as in Example 11, except that a cathode active material was prepared using the lithium manganese-metal composite oxide (A) of Lil,lMy.asMgo.osO4 and lithium nickel-manganese-cobalt composite oxide (B) of LiNio.3Mno,3Coo,402 in a mixing ratio of 70:30 and safety testing of the battery was carried out. The results are shown in Table 7 below.
[Table 7]
Mixing weight ratio Ni I Mn , Co I Overcharge Lil.iMnl.ssMgo.os~a to Lil_ aNibMncCo 1 _b-c4z Example 19 (70:30) 1/3 1/3 1/3 No fire Comp. Example 11 (?0:30) 0.15 0.15 0.7 Fire Comp. Example 12 (70:30) 0.3 0.3 0.4 Fire As can be seen from Table 7, even when the weight mixing ratio of the spinel structure lithium manganese-metal composite oxide (A) to the layered structure lithium nickel-manganese-cobalt composite oxide (B) is 70:30, if the composition ratio of Mn is less than 0.3, or the composition ratio of Co is greater than 0.4 in lithium nickel-manganese-cobalt composite oxide (B) of Li,_aNibMn~Col_b-cOz, it is impossible to secure safety of the battery. Therefore, in the mixture of the lithium manganese-metal composite oxide (A) and lithium nickel-manganese-cobalt composite oxide (B), particularly the composition ratio of nickel, cobalt and manganese in lithium nickel-manganese-cobalt composite oxide (B) is very important for safety of the battery.
INDUSTRIAL APPLICABILITY
As described above, a non-aqueous electrolyte-based secondary battery using a mixture of the particular lithium manganese-metal composite oxide (A) and particular lithium nickel-manganese-cobalt composite oxide (B) in accordance with the present invention, as a cathode active material, can secure safety of the battery and improve service life thereof even under high current, short period charge/discharge conditions and high temperature conditions.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
-2?-
Example 11 A lithium manganese-metal composite oxide (A) of Li,,~Mnl.gsMgo.osGa ~d lithium nickel-manganese-cobalt composite oxide (B) of LiNili3Mn1i3Co1i302 were used in a weight ratio of 90:10 to prepare a cathode active material. The cathode active material, carbon black and as a binder, PVDF in a weight ratio of 85:10:5 were mixed in an organic solvent, NMP to prepare a slurry. The resulting slurry was applied to both sides of aluminum foil having a thickness of 20 ~cm and dried to prepare a cathode.
Spherical artificial graphite powder having high crystallinity and average particle size of 12 ~tm and the binder, PVDF were mixed in a weight ratio of 90:10, and then admixed in NMP to prepare a slurry. The resulting slurry was applied to copper foil having a thickness of 10 ~m and dried, followed by roll pressing to a thickness of 60 ~m so as to prepare an anode.
A stacked type lithium battery, as shown in FIG. 1, was fabricated using the thus-prepared cathode and anode, and a 1 M LiPF6 EC/EMC solution as an electrolyte.
When the lithium metal is used as the anode, it is difficult to confirm high power output higher than 5 C, due to slow diffusion rate of the lithium metal.
Therefore, using carbon as the anode, life span performance of the battery upon charge/discharge with high current pulse was tested.
In order to evaluate the life span performance of the battery upon charge/discharge with high current pulse, a large number of charge/discharge were repeated with current of SOA at room temperature and 40 to 60% DOD (Depth Of Discharge). High current charge/discharge discharge capacity retention rate of the S battery was calculated according to the following Equation 2. The results are shown in Table 3 below and FIG. 4, respectively:
Eauation High current charge/discharge discharge capacity retention rate (%) _ (discharge capacity at initial current density of 1 C l discharge capacity at current density of 1 C
after 50 A cycle charge/discharge) x 100 In addition, the battery safety was tested. The results are shown in Table 4 below. Safety testing of the battery was carried out by overcharging the battery to SOC
(State Of Charge) of 200 or 20 volts by high current of 32 A and confirming the presence of battery firing.
Examples 12 through 1 S
Batteries were assembled using the same procedure as in Example 11, except that a mixing ratio (by weight) of Li1_lMn1.85Mgo.os~a to L1N11i3Mri,i3C0,/3O2 was varied. High current pulse charge/discharge life span performance (high load discharge rate) of the batteries was evaluated and safety testing of the batteries was also carried out. The results are shown in the following Tables 3 and 4, and FIG. 4, respectively.
Comparative Example 5 A battery was assembled using the same procedure as in Example 11, except that the mixing ratio (by weight) of Lil.lMn,.gsMgo.os0a to LiNili3Mn1i3Co~i302 was 100:0. High current pulse charge/discharge life span performance (high load discharge rate) of the battery was evaluated and safety testing of the battery was carried out. The results are shown in the following Tables 3 and 4, and FIG. 4, respectively.
Comparative Example 6 A battery was assembled using the same procedure as in Example 11, except that the mixing ratio (by weight) of Lil.lMnl.asMgo.osGa to LiNil~3Mn»Co~i302 was 0:100. High current pulse charge/discharge life span performance (high load discharge rate) of the battery was evaluated and safety testing of the battery was carried out. The results are shown in the following Tables 3 and 4, and FIG. 4, respectively.
[Table 3]
Mixing weight ratio DischargeDischargeDischarge Discharge of Initial capacity capacity capacity capacity Lii.~MnI.BSMgo.os~adischarge retentionretentionretention retention to capacity rate (%) rate (%) rate (%) rate (%) LiNili3Mnv3Co,~02retentionafter after after 20000after in cathode activerate (%) cycles cycles cycles cycles material Example 11 (90:10)100 92 86 82 78 Example 12 (80:20)100 93 86 84 79 Example 13 (50:50)100 94 89 85 81 Example 14 (30:70)100 96 89 86 83 Example 1 S 100 96 91 87 82 (20:80) Comp. Example 100 92 82 75 73 ( 100:0) Comp. Example (0:100) As can be seen from Table 3, upon mixing the lithium manganese-metal composite oxide (A) and the lithium nickel-manganese-cobalt composite oxide (B), a high current charge/discharge life span of the battery increases as the mixing ratio of the 5 lithium nickel-manganese-cobalt composite oxide (B) increases. This is believed due to that, even though high current charge/discharge of the lithium secondary battery results in elevated temperature of the battery, a mixed electrode of the spinel structure lithium manganese-metal composite oxide (A) and layered structure lithium nickel-manganese-cobalt composite oxide (B) has a high pH and basically stable structure at high temperature, thereby having effects on increase of battery life span, as also shown in preceding examples.
[Table 4]
Mixing weight ratio of Lil.lMn1,85Mgo.osOa to Overcharge LiNiji3Mn,i3Co,i302 in cathode active material Example 11 90:10 No fire Example 12 80:20 No fire Example 13 50:50 Fire Example 14 30:70 Fire Example 15 20:80 Fire Comp. Example 100:0 No fire Comp. Example 0:100 Fire From the results of Table 4, it can be seen that in the weight mixing ratio of the lithium manganese-metal composite oxide (A) and lithium nickel-manganese-cobalt composite oxide (B), battery safety can be secured when the proportion of the composite oxide (A) exceeds 50%. This effect is believed due to safety of the spinel structure lithium manganese-metal composite oxide (A). Although, the cathode active material of Comparative Example 5 exhibited superior safety due to no fire in experiments, it suffers from a problem associated with low discharge capacity retention rate after charge/discharge cycles, as can be seen from Table 3.
Example 16 A battery was assembled using the same procedure as in Example 6, except that LiI.oBMn~,g~Alo.os~a was used as the lithium manganese-metal composite oxide (A), instead of Li,,~Mn1.85Alo.os~a~ and high temperature service life of the battery was evaluated. The results are shown in Table 5 below.
Comparative Example 7 A battery was assembled using the same procedure as in Example 16, except that LiI.oBMn~,920~ was used as the lithium manganese-metal composite oxide (A), instead of Lii.o8Mn1.8~Alo,osDa~ ~d high temperature service life of the battery was evaluated. The results are shown in Table 5.
[Table 5) Discharge capacity retention rate I Capacity /gram after 100 cycles at 50C (fig) (%) Example 16 92.3 104.3 Comp. Example 87.8 105.3 As can be seen from Table 5, due to substitution of Mn with other metal M, the lithium manganese-metal composite oxide (A) of Lit+xMnz-X-yMyOa [provided, 0<x<_0.2, 0<y<_0.1, and M is at least one element selected from the group consisting of Al, Mg, S Ni, Co, Fe, Ti, V, Zr and Zn] is more stable at high temperatures than the spinet structure Lil+XMnz-XOa (provided, 0<x<0.2) lithium manganese oxide without substitution of metal element. This is believed due to that the lithium manganese-metal composite oxide (A) in which Mn was substituted with other metal M results in relatively reduced elution of manganese ions at high temperatures, as compared to the lithium manganese oxide without substitution of metal element.
Examt~les 17 and 18 A cathode was prepared using the same procedure as in Example 11, except that in a lithium nickel-manganese-cobalt composite oxide (B) of Li,_aNibMn~Coi-b-X02, the composition ratio of nickel, cobalt, and manganese was controlled as described in Table 6 below. In order to verify safety of the cathode active material, DSC
(Differential Scanning Calorimetry) was performed. Onset temperature and calorie are shown in Table 6 below.
Comparative Examples 8 through 10 Experiments were repeated using the same procedure as in Example 11, except that in a lithium nickel-manganese-cobalt composite oxide (B) of Li~_aNibMn~Co,_b-c02, a composition ratio of nickel, cobalt and manganese was controlled as described in Table 6 below. The results are shown in Table 6 below.
[Table 6]
Ni~b~ Mn~~? CO(1-b-c)Tonset Delta H
Example 17 0.33 0.33 0.33 220 67 Example 18 0.4 0.4 0.2 260 SS
Comp. Example 0.15 0.15 0.7 190 210 Comp. Example 0 0 100 170 273 Comp. Example 0.5 0.5 0 290 48 As can be seen from Table 6, as the ratio of manganese increases and correspondingly the ratio of cobalt decreases in the lithium nickel-manganese-cobalt 10 composite oxide (B), onset temperature rises and calorie remarkably decreases. In particular, such changes are prominent when the composition of manganese is about 0.3. This fact means that safety of the cathode is improved because manganese in the material is less reactive at high temperature, as compared to cobalt. Although the cathode active material of Comparative Example 10 exhibits results of high onset temperature and low calorie, such an active material has high nickel content, thus disadvantageously causing swelling of the battery.
Example 19 A battery was assembled using the same procedure as in Example 11, except that a cathode active material was prepared using the lithium manganese-metal composite oxide (A) of Li~,~MnI,BSMgo.osOa and lithium nickel-manganese-cobalt composite oxide (B) of LiNiti3Mn1i3Co1i302 in a mixing ratio of 70:30, and safety testing of the battery was then carried out. The results are shown in Table 7 below.
Comparative Examt~le 11 A battery was assembled using the same procedure as in Example 11, except that a cathode active material was prepared using the lithium manganese-metal composite oxide (A) of Lil.~MnI.BSMgo.osOa ~d lithium nickel-manganese-cobalt composite oxide (B) of LiNio,lsMno.~sCooaOa in a mixing ratio of 70:30 and safety testing of the battery was carried out. The results are shown in Table 7 below.
Comparative Example 12 A battery was assembled using the same procedure as in Example 11, except that a cathode active material was prepared using the lithium manganese-metal composite oxide (A) of Lil,lMy.asMgo.osO4 and lithium nickel-manganese-cobalt composite oxide (B) of LiNio.3Mno,3Coo,402 in a mixing ratio of 70:30 and safety testing of the battery was carried out. The results are shown in Table 7 below.
[Table 7]
Mixing weight ratio Ni I Mn , Co I Overcharge Lil.iMnl.ssMgo.os~a to Lil_ aNibMncCo 1 _b-c4z Example 19 (70:30) 1/3 1/3 1/3 No fire Comp. Example 11 (?0:30) 0.15 0.15 0.7 Fire Comp. Example 12 (70:30) 0.3 0.3 0.4 Fire As can be seen from Table 7, even when the weight mixing ratio of the spinel structure lithium manganese-metal composite oxide (A) to the layered structure lithium nickel-manganese-cobalt composite oxide (B) is 70:30, if the composition ratio of Mn is less than 0.3, or the composition ratio of Co is greater than 0.4 in lithium nickel-manganese-cobalt composite oxide (B) of Li,_aNibMn~Col_b-cOz, it is impossible to secure safety of the battery. Therefore, in the mixture of the lithium manganese-metal composite oxide (A) and lithium nickel-manganese-cobalt composite oxide (B), particularly the composition ratio of nickel, cobalt and manganese in lithium nickel-manganese-cobalt composite oxide (B) is very important for safety of the battery.
INDUSTRIAL APPLICABILITY
As described above, a non-aqueous electrolyte-based secondary battery using a mixture of the particular lithium manganese-metal composite oxide (A) and particular lithium nickel-manganese-cobalt composite oxide (B) in accordance with the present invention, as a cathode active material, can secure safety of the battery and improve service life thereof even under high current, short period charge/discharge conditions and high temperature conditions.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
-2?-
Claims (7)
1. A cathode active material for a secondary battery, comprising a lithium manganese-metal composite oxide (A) having a spinet structure and represented by the following general formula 1, and a lithium nickel-manganese-cobalt composite oxide (B) having a layered structure and represented by the following general formula 2:
Li1+x Mn2-x-y M y O4 ~~(1) Li1-a Ni b Mn c Co1-b-c O2 ~(2) wherein, 0 < x < 0.2;
0 < y < 0.1;
M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Ti, V, Zr and Zn;
-0.1 <= a <= 0.1;
0.3 < b < 0.5; and 0.3 < c < 0.5.
Li1+x Mn2-x-y M y O4 ~~(1) Li1-a Ni b Mn c Co1-b-c O2 ~(2) wherein, 0 < x < 0.2;
0 < y < 0.1;
M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Ti, V, Zr and Zn;
-0.1 <= a <= 0.1;
0.3 < b < 0.5; and 0.3 < c < 0.5.
2. The cathode active material according to claim 1, wherein the content of the lithium manganese-metal composite oxide (A) is greater than 50%, based on the total weight of the mixture.
3. The cathode active material according to claim 2, wherein the content of the lithium manganese-metal composite oxide (A) is in the range of 80 to 95%, based on the total weight of the mixture.
4. The cathode active material according to claim 1, wherein the pH of the active material is in the range of 8.9 to 10.4.
5. The cathode active material according to claim 1, wherein the metal (M) is selected from the group consisting of Mg, Al, Co and Ni.
6. A lithium secondary battery comprising the cathode active material according to any one of claims 1 through 5.
7. The lithium secondary battery according to claim 6, wherein the battery is used as a high power, large capacity power source.
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| KR10-2004-0021205 | 2004-03-29 | ||
| KR20040021205 | 2004-03-29 | ||
| PCT/KR2005/000909 WO2006004279A1 (en) | 2004-03-29 | 2005-03-29 | Lithium secondary battery with high power |
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| EP (4) | EP1730802B1 (en) |
| JP (1) | JP4637899B2 (en) |
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Families Citing this family (67)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006073253A (en) * | 2004-08-31 | 2006-03-16 | Sanyo Electric Co Ltd | Nonaqueous electrolyte battery |
| JP4794893B2 (en) * | 2005-04-12 | 2011-10-19 | パナソニック株式会社 | Non-aqueous electrolyte secondary battery |
| US8895187B2 (en) * | 2005-08-16 | 2014-11-25 | Lg Chem, Ltd. | Cathode active material and lithium secondary battery containing the same |
| KR100783294B1 (en) | 2005-08-16 | 2007-12-10 | 주식회사 엘지화학 | Positive electrode active material and lithium secondary battery containing the same |
| US8936873B2 (en) * | 2005-08-16 | 2015-01-20 | Lg Chem, Ltd. | Cathode active material and lithium secondary battery containing them |
| KR100783293B1 (en) | 2005-08-16 | 2007-12-10 | 주식회사 엘지화학 | Positive electrode active material and lithium secondary battery containing the same |
| CN100466343C (en) * | 2006-04-04 | 2009-03-04 | 北京中润恒动电池有限公司 | Positive electrode active material composition, positive electrode sheet and lithium ion battery |
| KR100801637B1 (en) * | 2006-05-29 | 2008-02-11 | 주식회사 엘지화학 | Positive electrode active material and lithium secondary battery containing the same |
| US20100028773A1 (en) * | 2007-03-05 | 2010-02-04 | Toyo Ink Mfg. Co., Ltd. | Composition for battery |
| CN101409347B (en) * | 2007-10-11 | 2011-01-12 | 比亚迪股份有限公司 | A kind of lithium ion battery negative plate and preparation method thereof |
| JP5322259B2 (en) * | 2008-02-06 | 2013-10-23 | Ｎｅｃエナジーデバイス株式会社 | Positive electrode for secondary battery and lithium secondary battery using the same |
| EP2092943A1 (en) | 2008-02-21 | 2009-08-26 | Universität Bern | Implantable access for removal and/or return of fluids |
| CN101960655A (en) * | 2008-03-04 | 2011-01-26 | 埃纳德尔公司 | Anode for lithium-ion cell and method of making the same |
| CN102187502B (en) * | 2008-10-22 | 2014-07-09 | 株式会社Lg化学 | Cathode active material with improved electrode efficiency and energy density |
| JP5599810B2 (en) * | 2008-11-07 | 2014-10-01 | イーグルピッチャー テクノロジーズ，エルエルシー | Non-aqueous cell is an amorphous or semi-crystalline copper-manganese oxide cathode material |
| EP2357692B1 (en) * | 2008-11-20 | 2014-09-24 | Lg Chem, Ltd. | Lithium secondary battery having improved characteristics |
| JP4948510B2 (en) * | 2008-12-02 | 2012-06-06 | トヨタ自動車株式会社 | All solid battery |
| US8663825B2 (en) * | 2009-03-05 | 2014-03-04 | Eaglepicher Technologies, Llc | End of life indication system and method for non-aqueous cell having amorphous or semi-crystalline copper manganese oxide cathode material |
| WO2010102239A1 (en) | 2009-03-05 | 2010-09-10 | Eaglepicher Technologies, Llc | End of life indication system and method for non-aqueous cell having amorphous or semi-crystalline copper manganese oxide cathode material |
| JP5528534B2 (en) | 2009-03-18 | 2014-06-25 | イーグルピッチャー テクノロジーズ，エルエルシー | Non-aqueous electrochemical cell having a mixture of at least three cathode materials |
| JP5599866B2 (en) * | 2009-04-06 | 2014-10-01 | イーグルピッチャー テクノロジーズ，エルエルシー | Thermal battery cathode material and battery containing the same |
| WO2010117954A1 (en) * | 2009-04-06 | 2010-10-14 | Eaglepicher Technologies, Llc | Thermal battery electrolyte compositions, electrode-electrolyte composites, and batteries including the same |
| KR101093705B1 (en) | 2009-04-29 | 2011-12-19 | 삼성에스디아이 주식회사 | Lithium secondary battery |
| JP5084802B2 (en) * | 2009-09-04 | 2012-11-28 | 株式会社日立製作所 | Lithium ion secondary battery |
| US8142933B2 (en) * | 2009-09-30 | 2012-03-27 | Conocophillips Company | Anode material for high power lithium ion batteries |
| JP5495300B2 (en) * | 2009-10-02 | 2014-05-21 | Ｎｅｃエナジーデバイス株式会社 | Lithium ion secondary battery |
| TWI399525B (en) * | 2009-10-09 | 2013-06-21 | Micro Star Int Co Ltd | Distance measurement device |
| DE102009049326A1 (en) * | 2009-10-14 | 2011-04-21 | Li-Tec Battery Gmbh | Cathodic electrode and electrochemical cell for this purpose |
| JP2011146152A (en) * | 2010-01-12 | 2011-07-28 | Toyota Motor Corp | Cathode paste and manufacturing method of cathode paste |
| US9077027B2 (en) * | 2010-03-04 | 2015-07-07 | Samsung Sdi Co., Ltd. | Electrode assembly and secondary battery using the same |
| DE102010011413A1 (en) * | 2010-03-15 | 2011-09-15 | Li-Tec Battery Gmbh | Cathodic electrode and electrochemical cell for dynamic applications |
| JP5961922B2 (en) * | 2010-05-31 | 2016-08-03 | 日産自動車株式会社 | Negative electrode for secondary battery and method for producing the same |
| US8652674B2 (en) | 2010-06-24 | 2014-02-18 | Eaglepicher Technologies, Llc | Thermal battery cathode materials containing nickel disulfide and batteries including same |
| JP5809870B2 (en) * | 2011-06-22 | 2015-11-11 | 富士フイルム株式会社 | Photoelectric conversion element, photoelectrochemical cell, and dye used in them |
| JP5970978B2 (en) | 2011-07-04 | 2016-08-17 | 日産自動車株式会社 | Positive electrode active material for electric device, positive electrode for electric device and electric device |
| US10355306B2 (en) | 2011-09-08 | 2019-07-16 | Eaglepicher Technologies, Llc | High rate and energy cathode material for lithium batteries |
| CN103403945B (en) * | 2012-02-29 | 2016-12-14 | 新神户电机株式会社 | Lithium ion battery |
| CN103636048B (en) * | 2012-02-29 | 2016-12-14 | 新神户电机株式会社 | Lithium ion battery |
| JP5621933B2 (en) * | 2012-02-29 | 2014-11-12 | 新神戸電機株式会社 | Lithium ion battery |
| JP5999307B2 (en) * | 2012-03-07 | 2016-09-28 | 日産自動車株式会社 | Positive electrode active material, positive electrode for electric device and electric device |
| EP2822083B1 (en) | 2012-04-20 | 2017-07-19 | LG Chem, Ltd. | Lithium secondary battery having improved rate characteristics |
| CN104205469B (en) | 2012-04-20 | 2018-03-20 | 株式会社Lg 化学 | Electrode for secondary battery and lithium secondary battery comprising same |
| CN104247136B (en) | 2012-04-20 | 2017-10-03 | 株式会社Lg 化学 | Secondary lithium batteries electrolyte and include the lithium secondary battery of electrolyte |
| EP2822082B1 (en) * | 2012-04-20 | 2017-12-20 | LG Chem, Ltd. | Electrolyte for secondary battery and lithium secondary battery including same |
| CN104488126B (en) * | 2012-08-01 | 2017-06-23 | 株式会社Lg 化学 | Electrode for secondary battery component and the lithium secondary battery comprising it |
| JP6035689B2 (en) | 2012-08-02 | 2016-12-07 | 日産自動車株式会社 | Method for producing non-aqueous organic electrolyte secondary battery |
| CN103904309B (en) * | 2012-12-24 | 2017-12-26 | 天津工业大学 | A kind of solid-solution material of the manganese containing NiTi and preparation method thereof |
| JP5605867B2 (en) * | 2013-01-29 | 2014-10-15 | Ｎｅｃエナジーデバイス株式会社 | Positive electrode for secondary battery and lithium secondary battery using the same |
| JP6510164B2 (en) * | 2013-03-29 | 2019-05-08 | 株式会社Ｇｓユアサ | Storage element and automotive storage battery system |
| KR101621410B1 (en) | 2013-09-11 | 2016-05-16 | 주식회사 엘지화학 | Lithium electrode and lithium secondary battery including the same |
| US10069143B2 (en) * | 2013-12-23 | 2018-09-04 | Uchicago Argonne, Llc | Cobalt-stabilized lithium metal oxide electrodes for lithium batteries |
| KR102344364B1 (en) * | 2014-02-13 | 2021-12-28 | 삼성에스디아이 주식회사 | Lithium battery |
| KR102344365B1 (en) * | 2014-02-13 | 2021-12-28 | 삼성에스디아이 주식회사 | Lithium battery |
| KR20150095451A (en) * | 2014-02-13 | 2015-08-21 | 삼성에스디아이 주식회사 | Lithium battery |
| KR102083712B1 (en) * | 2014-04-11 | 2020-03-02 | 가부시키가이샤 인비젼 에이이에스씨 재팬 | Flat-type secondary battery |
| WO2015156167A1 (en) * | 2014-04-11 | 2015-10-15 | 日産自動車株式会社 | Flat secondary battery |
| JP2016184521A (en) * | 2015-03-26 | 2016-10-20 | オートモーティブエナジーサプライ株式会社 | Nonaqueous electrolyte secondary battery |
| JP6164332B2 (en) * | 2015-04-28 | 2017-07-19 | 日亜化学工業株式会社 | Nickel-cobalt composite hydroxide particles and production method thereof, positive electrode active material for non-aqueous electrolyte secondary battery and production method thereof, and non-aqueous electrolyte secondary battery |
| US10862106B2 (en) | 2015-10-28 | 2020-12-08 | Samsung Electronics Co., Ltd. | Composite positive electrode active material, positive electrode including the same, and lithium battery including the positive electrode |
| JP6443416B2 (en) | 2016-09-13 | 2018-12-26 | トヨタ自動車株式会社 | Non-aqueous electrolyte secondary battery manufacturing method and non-aqueous electrolyte secondary battery |
| JP6859888B2 (en) | 2017-07-31 | 2021-04-14 | トヨタ自動車株式会社 | Lithium-ion secondary battery and its manufacturing method |
| JP6838521B2 (en) * | 2017-08-10 | 2021-03-03 | トヨタ自動車株式会社 | All-solid-state battery and negative electrode |
| CN110998930B (en) | 2017-08-14 | 2023-05-05 | 三井金属矿业株式会社 | Positive electrode active material for all-solid-state lithium secondary battery |
| US12614723B2 (en) * | 2017-08-28 | 2026-04-28 | Mitsui Kinzoku Company, Limited | Positive electrode active substance for all solid-state lithium secondary battery |
| CN111033828B (en) * | 2017-08-28 | 2023-03-24 | 三井金属矿业株式会社 | Positive electrode active material for all-solid-state lithium secondary battery |
| CN116666616B (en) * | 2022-02-21 | 2026-04-17 | 中国科学院宁波材料技术与工程研究所 | A cobalt-free layered oxide cathode material |
| CN116230918B (en) * | 2023-05-05 | 2023-10-10 | 宁德时代新能源科技股份有限公司 | Positive electrode material, positive electrode plate, battery and electric equipment |
Family Cites Families (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69504663T2 (en) * | 1994-06-10 | 1999-02-18 | Danionics A/S, Odense S | CATHODE MATERIAL FOR Li-SECONDARY BATTERIES AND METHOD AND PRECURSOR MATERIAL FOR THEIR PRODUCTION |
| US6103422A (en) * | 1995-12-26 | 2000-08-15 | Kao Corporation | Cathode active material and nonaqueous secondary battery containing the same |
| IT1283968B1 (en) * | 1996-03-29 | 1998-05-07 | Consiglio Nazionale Ricerche | RECHARGEABLE LITHIUM OR LITHIUM-ION BATTERY ABLE TO SUSTAIN PROLONGED CYCLING. |
| US5753202A (en) * | 1996-04-08 | 1998-05-19 | Duracell Inc. | Method of preparation of lithium manganese oxide spinel |
| JPH1092430A (en) * | 1996-09-20 | 1998-04-10 | Yuasa Corp | Lithium secondary battery |
| US6040089A (en) * | 1997-02-28 | 2000-03-21 | Fmc Corporation | Multiple-doped oxide cathode material for secondary lithium and lithium-ion batteries |
| JP3869605B2 (en) * | 1999-03-01 | 2007-01-17 | 三洋電機株式会社 | Nonaqueous electrolyte secondary battery |
| KR100326457B1 (en) * | 1999-03-10 | 2002-02-28 | 김순택 | A positive active material for a lithium secondary battery and a method of preparing the same |
| US6248477B1 (en) * | 1999-09-29 | 2001-06-19 | Kerr-Mcgee Chemical Llc | Cathode intercalation compositions, production methods and rechargeable lithium batteries containing the same |
| JP4159212B2 (en) * | 1999-11-12 | 2008-10-01 | 三洋電機株式会社 | Nonaqueous electrolyte secondary battery |
| JP4183374B2 (en) * | 2000-09-29 | 2008-11-19 | 三洋電機株式会社 | Nonaqueous electrolyte secondary battery |
| JP4876316B2 (en) * | 2001-01-26 | 2012-02-15 | 東ソー株式会社 | Novel lithium manganese composite oxide, method for producing the same, and use thereof |
| JP2002270247A (en) * | 2001-03-14 | 2002-09-20 | Osaka Gas Co Ltd | Non-aqueous secondary battery |
| JP2002289193A (en) * | 2001-03-27 | 2002-10-04 | Osaka Gas Co Ltd | Non-aqueous secondary battery |
| JP2003092108A (en) * | 2001-07-12 | 2003-03-28 | Mitsubishi Chemicals Corp | Positive electrode material for lithium secondary battery, positive electrode for lithium secondary battery, and lithium secondary battery |
| JP3631197B2 (en) | 2001-11-30 | 2005-03-23 | 三洋電機株式会社 | Nonaqueous electrolyte secondary battery |
| JP4404179B2 (en) * | 2001-12-06 | 2010-01-27 | ソニー株式会社 | Positive electrode active material and secondary battery using the same |
| WO2003063275A1 (en) * | 2002-01-08 | 2003-07-31 | Sony Corporation | Positive plate active material and nonaqueous electrolyte secondary cell using same |
| US7691535B2 (en) * | 2002-03-27 | 2010-04-06 | Gs Yuasa Corporation | Active substance of positive electrode and non-aqueous electrolyte battery containing the same |
| JP2004139743A (en) * | 2002-08-21 | 2004-05-13 | Sanyo Electric Co Ltd | Nonaqueous electrolyte secondary battery |
| JP4731106B2 (en) * | 2002-09-30 | 2011-07-20 | 三洋電機株式会社 | Nonaqueous electrolyte secondary battery |
| JP4518821B2 (en) * | 2003-03-26 | 2010-08-04 | 三洋電機株式会社 | Nonaqueous electrolyte secondary battery electrode and method for producing the same |
| JP5142452B2 (en) * | 2003-09-29 | 2013-02-13 | 三洋電機株式会社 | Non-aqueous electrolyte secondary battery charge / discharge control method |
| KR100578877B1 (en) * | 2004-03-12 | 2006-05-11 | 삼성에스디아이 주식회사 | Lithium secondary battery |
| JP4726423B2 (en) * | 2004-03-17 | 2011-07-20 | 三洋電機株式会社 | Positive electrode material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery |
-
2005
- 2005-03-28 US US11/091,072 patent/US7476467B2/en active Active
- 2005-03-29 EP EP05789669A patent/EP1730802B1/en not_active Expired - Lifetime
- 2005-03-29 KR KR1020050026213A patent/KR100595897B1/en not_active Expired - Lifetime
- 2005-03-29 BR BRPI0508238A patent/BRPI0508238B8/en not_active IP Right Cessation
- 2005-03-29 TW TW094109896A patent/TWI339913B/en not_active IP Right Cessation
- 2005-03-29 EP EP11175941.1A patent/EP2398099B1/en not_active Expired - Lifetime
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- 2005-03-29 EP EP11175940.3A patent/EP2398098B1/en not_active Expired - Lifetime
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- 2005-03-29 EP EP11175939.5A patent/EP2398097B1/en not_active Expired - Lifetime
- 2005-03-29 CN CN2005800099336A patent/CN1938883B/en not_active Expired - Lifetime
- 2005-03-29 JP JP2007504892A patent/JP4637899B2/en not_active Expired - Lifetime
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| EP1730802A4 (en) | 2010-07-07 |
| BRPI0508238B8 (en) | 2023-01-10 |
| CA2561743A1 (en) | 2006-01-12 |
| EP2398098B1 (en) | 2016-12-28 |
| WO2006004279A1 (en) | 2006-01-12 |
| EP2398098A1 (en) | 2011-12-21 |
| EP2398099B1 (en) | 2014-12-24 |
| EP1730802A1 (en) | 2006-12-13 |
| BRPI0508238A (en) | 2007-07-17 |
| RU2315395C1 (en) | 2008-01-20 |
| JP4637899B2 (en) | 2011-02-23 |
| US20050271943A1 (en) | 2005-12-08 |
| EP2398097B1 (en) | 2014-11-05 |
| US7476467B2 (en) | 2009-01-13 |
| CN1938883A (en) | 2007-03-28 |
| TW200541141A (en) | 2005-12-16 |
| EP2398097A1 (en) | 2011-12-21 |
| JP2007531216A (en) | 2007-11-01 |
| CN1938883B (en) | 2010-06-16 |
| KR20060044953A (en) | 2006-05-16 |
| KR100595897B1 (en) | 2006-07-03 |
| EP1730802B1 (en) | 2012-03-14 |
| BRPI0508238B1 (en) | 2015-09-08 |
| TWI339913B (en) | 2011-04-01 |
| EP2398099A1 (en) | 2011-12-21 |
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