WO2005069410A1 - リチウム二次電池用負極及びリチウム二次電池 - Google Patents
リチウム二次電池用負極及びリチウム二次電池 Download PDFInfo
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- WO2005069410A1 WO2005069410A1 PCT/JP2004/000301 JP2004000301W WO2005069410A1 WO 2005069410 A1 WO2005069410 A1 WO 2005069410A1 JP 2004000301 W JP2004000301 W JP 2004000301W WO 2005069410 A1 WO2005069410 A1 WO 2005069410A1
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- secondary battery
- negative electrode
- lithium secondary
- graphite particles
- graphite
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a negative electrode for a lithium secondary battery and a lithium secondary battery. More specifically, high capacity, rapid charge / discharge characteristics and cycle characteristics suitable for use in portable devices, electric vehicles, power storage, etc. U lithium secondary battery and it Technology related to the negative electrode to obtain
- the negative electrode of the conventional lithium secondary battery is, for example, natural graphite particles, artificial graphite particles obtained by graphitizing graphite, organic polymer materials, artificial graphite particles obtained by graphitizing pitch and the like, graphite particles obtained by pulverizing these, There is a spherical graphite obtained by graphitizing Mesov X carbon. These graphite particles are mixed with an organic binder and an organic solvent to form a graphite paste, the graphite paste is applied to the surface of a copper foil, the solvent is dried, and the resultant is used for a U.sub.th secondary battery. Used as a negative electrode
- the present invention provides a negative electrode suitable for a lithium secondary battery having excellent rapid charge / discharge characteristics and cycle characteristics, and further provides a negative electrode suitable for a high capacity lithium secondary battery. It is Invention 7T
- the present invention is a negative electrode for lithium secondary battery having a mixture layer comprising graphite particles and an organic binder on a current collector, which is measured by X-ray diffraction of the mixture layer Of the negative electrode for lithium ion secondary batteries with an average diffraction intensity ratio (0 0 2) / (1 1 0) of less than 500
- the present invention relates to a negative electrode for a thymium secondary battery.
- the average particle diameter of the graphite particles is 1 to 100 m
- the crystallite size L c (0 0 2) of the crystal in the C-axis direction is 500 onss
- the present invention relates to a lithium secondary battery comprising the negative electrode for a lithium secondary battery of the present invention according to any one of the above (1) to (3) and a positive electrode containing a lithium compound. .
- the present invention relates to the lithium secondary battery according to the above (4), wherein the lithium compound contains at least Ni.
- FIG. 1 is a schematic partial sectional view showing an example of a lithium secondary battery according to the present invention.
- FIG. 2 is a schematic view of a lithium secondary battery used to measure the charge / discharge capacity and the discharge capacity retention rate in the example of the present invention.
- the negative electrode for a lithium secondary battery of the present invention is a negative electrode for a lithium secondary battery having a mixture layer comprising graphite particles and an organic binder on a current collector, which comprises graphite particles and an organic binder.
- the diffraction intensity ratio (0 0 2) / (1 1 0) measured by X-ray diffraction of the mixture layer containing the adhesive is It is characterized by being less than 5 0 0.
- the diffraction intensity ratio (0 0 2) / (1 1 0) is preferably 1 0 to 5 0 0, more preferably 1 0-4 0 0, further preferably 1 0 to It is preferably in the range of 300, particularly preferably 500 to 200.
- the diffraction intensity ratio (0 0 2) / (1 10) of the mixture layer of the graphite particles and the organic binder is obtained by X-ray diffraction using Cu Ka aray as an X-ray source.
- setting the diffraction intensity ratio (0 0 2) / (1 1 0) to 500 or less means, for example, the particle diameter of the graphite particles, and the pressing pressure at the time of producing the negative electrode. It is possible by adjusting the force, the thermal expansion coefficient of the raw material of the graphite particles, etc. B113 ⁇ 4. In addition, if the number of pieces inside the graphite particle is adjusted appropriately, etc.
- the adjustment can also be made by suppressing the shape change or destruction of particles when producing the negative electrode.
- the density of the mixture layer containing the graphite particles and the organic binder on the current collector is 1 ⁇ 50 to 1
- the density is: 1 • 5 5 to 1.
- Graphite particles and organic binder on current collector in the negative electrode of the present invention The energy density per volume of the lithium secondary battery obtained using this negative electrode can be increased by increasing the density of the mixture layer containing. If the density of the mixture layer containing the graphite particles and the organic binder is less than 1.50 g / cm 3 , the energy density per volume of the resulting Timumn secondary battery tends to be small.
- the density of the mixture layer containing the graphite particles and the binder after integration is appropriately adjusted, for example, by the pressure at the time of integration molding, or the clearance of a device such as a roll press. be able to.
- L c (0 0 2) is preferably 5 0 0 0 0 0 5 or more ⁇ 0, 8 0
- the interlayer distance d (002) of the crystal of the graphite particles is preferably 3.38 or less, more preferably 3.37 or less, and 3.3 or less. 6 It is further preferred that it is less than the ong strome. Also, it is preferable to have a near perfect graphite structure.
- the interlaminar distance d (0 0 2) of the crystal is 3.3 8 8 If it exceeds, the discharge capacity tends to decrease.
- the L c (0 0 2) and d (0 0 2) can be measured by X-ray wide-angle diffraction.
- the graphite particles used in the negative electrode for lithium secondary battery of the present invention have a diffraction intensity ratio (0 0 2) / (1 10) may be set to 500 or less, for example, graphite in the form of flakes, spherical graphite, graphite in which the particle shape is modified by mechanical treatment, or a plurality of materials are mixed. Although it can be used, it is preferable to use a plurality of flat primary particles and a secondary graphite particle in which the primary particles are assembled or bonded such that the orientation planes are not parallel. These are used alone or in combination of two or more.
- flat particles are those having a shape having a major axis and a minor axis and are not completely spherical. For example, those having a scaly shape, a scaly shape, or a lump of a part are included in this.
- the flat surface in the shape of each particle in other words, the flatmost surface as the orientation plane, is a plurality of flat particles. Gathers or bonds the respective orientation planes in a fixed direction without forming a graphite particle, which means that particles of each other, for example, a pitcher, etc.
- the state in which the particles are chemically linked via the ashed carbonaceous matter is that the particles do not chemically TO each other, but due to their shape etc. In the process of manufacturing the negative electrode, it means that the shape is maintained as an assembly. From the viewpoint of mechanical strength, preferred is the one with the same resistance.
- the graphite particles used in the present invention preferably have an aspect ratio of 5 or less, more preferably 1.25, and 1.2. In the case of ⁇ 3, it is more preferable, and in the case of 1.3-2.5, it is particularly preferable.
- Graphite particles having an aspect ratio of 5 or less may be secondary particles in which a plurality of primary particles are gathered or combined, or one particle may be applied with mechanical force to obtain an aspect ratio. The shape may be changed so as to be 5 or less, and further, it may be manufactured by combining these.
- the diffraction intensity ratio (0 0 2) / (1 10 0) measured by X-ray diffraction of the mixture layer containing the graphite particles of the negative electrode and the organic binder is large. There is a tendency to be easily broken, and as a result, the rapid charge / discharge characteristics and cycle characteristics of the obtained lithium secondary battery tend to be deteriorated.
- this aspect ratio is 1.
- the conductivity of the produced negative electrode tends to be lowered due to the decrease in the contact area between particles.
- the haze ratio in the present invention represented by AZB, is 0 in the present invention.
- the thickness is set to the length B in the minor axis direction.
- the graphite particles used in the present invention are preferably those which withstand mechanical processing with little change in shape, breakage, etc. of the graphite particles in the process of producing the negative electrode.
- the shape change or destruction of the graphite particle occurs, the X-ray of the mixture layer containing the graphite particle of the negative electrode and the organic binder due to the increase of the specific surface area and the orientation of the graphite particle on the electrode.
- the diffraction intensity ratio (0 0 2) / (1 10 0) measured by diffraction tends to be large, and as a result, the obtained lithium secondary battery Charge / discharge efficiency, thermal stability, rapid charge / discharge characteristics and cycle characteristics tend to be degraded.
- the primary particles of the graphite particles are observed, for example, when observed by a scanning electron microscope (SEM) or the like. Particulate unit. Also, the next particle means a lump in which the primary particles are aggregated or bound.
- the number of flat primary particles in one secondary particle is preferably 3 or more, and more preferably 5 or more.
- the size of each flat primary particle is preferably 1 l OO m in particle diameter, preferably 5 80 nm, more preferably 5 50 m In the case of the above, it is more preferable that they are 2/3 or less of the average particle diameter of the aggregated or bound secondary particles.
- the aspect ratio of individual flat primary particles is preferably 100 or less, more preferably 50 or less, and still more preferably 20 or less.
- the preferable lower limit of the aspect ratio of the primary particles is 1.2 and it is preferable that they are not spherical.
- the specific surface area of the secondary particles is preferably 8 m 2 or less, more preferably 5 m 2 / g or less. If the secondary particles having a specific surface area of 8 m 2 Z g or less as graphite particles are used for the negative electrode, the rapid charge / discharge characteristics and cycle characteristics of the resulting lithium primary battery can be improved. Also, the irreversible capacity of the first cycle can be reduced. If the specific surface area exceeds 8 m 2 / g, the irreversible capacity of the first cycle of the resulting lithium primary battery tends to be large, the energy density is small, and the negative electrode is prepared. Tend to require a lot of dressings. From the viewpoint of the rapid charge / discharge characteristics, cycle characteristics, etc.
- the specific surface is further improved.
- the product is more preferably 1.5 to 5 m 2 Z g and particularly preferably 2 to 5 m 2 g.
- the specific surface area can be measured, for example, by the BET method using nitrogen gas adsorption.
- the method for producing the negative electrode for lithium secondary battery according to the present invention is not particularly limited.
- at least a graphitizable aggregate or graphite and a graphitizable binder are mixed and pulverized, and then the pulverized product is obtained.
- An amount of 0% by mass is mixed and fired to obtain graphite particles. Then, an organic binder and a solvent are added to the graphite particles and mixed, the mixture is applied to a current collector, and the solvent is dried. After removal, it can be manufactured by pressure integration.
- the graphitizable aggregate for example, cox, resin carbide, etc. can be used, but even if it is a powder material which can be graphitized, coke which is easy to graphitize such as needle coke is available. Powder is preferred. Is a co-one box to be used as an aggregate, the thermal expansion coefficient of 0 9 X 1 0 -.. 6 ⁇ 7 0 X 1 0 -. 6 Z ° C is laid like, 1 0 X 1
- Thermal expansion coefficient is, 0 9 X 1 0 -.
- mixed compound layer comprising graphite particles and organic binder on a current collector of the negative electrode for Lithium secondary batteries fabricated
- the thermal expansion coefficient 7 0 X 1 0 -.
- the particle size of the graphitizable aggregate or graphite is preferably smaller than the particle size of the graphite particles to be produced, and the average particle size is preferably 1 to 80 m, If the ratio o ⁇ 50 m in 1 note is more preferable, it is particularly preferable if 5 to 50 zm.
- the graphitizable aggregate or graphite has an apex ratio of preferably 1250, more preferably in the range of 1.5 to 300. If it is in the range of 100, it is more preferable, 2 to
- the range of 5 is particularly preferable.
- the aspect ratio measurement is
- binders for example, organic materials such as tar, pitch, thermosetting resin, and thermoplastic resin are preferable. It is preferable to add 5 to 80% by weight to the graphitizable aggregate or graphite, and more preferable to add 10 to 80% by weight. The addition of 20 to 80% by weight is further preferable, and the addition of 30 to 80% by weight is particularly preferable. When the amount of binder is too large or too small, the aspect ratio and specific surface area of the produced graphite particles tend to be large.
- the method of mixing graphitizable aggregate or graphite and binder is not particularly limited, and can be carried out using, for example, a binder. Also, mixing at a temperature above the softening point of the binder is preferred. Specifically, in the case of binder, stirring, etc., 50 to 300 ° C. is preferable, and in the case of thermosetting resin, 20 to 180 is preferable. .
- the particle size of the pulverized product is preferably 1 to 100 / zm, and more preferably 580 m. 5 to 50 / xm is more preferable ⁇ 10 to 30 m is particularly preferable.
- the particle size of the pulverized material exceeds 100 m, the specific surface area of the obtained graphite particles tends to be large, and when it is less than 1 m, mixed ⁇ containing graphite particles of the negative electrode obtained and an organic binder Object layer (0 0 2)
- the ratio of (1 1 0) tends to be large.
- the volatile matter content of the pulverized material is preferably 0.55 wt%, more preferably less than 12.0 wt%, and still more preferably 5200 wt%.
- the volatile content can be determined, for example, from the weight loss value when the powder is heated at 800 for 10 minutes.
- the graphitization catalyst to be mixed with the pulverized material is not particularly limited as long as it has a function as a graphitization catalyst, but, for example, metals such as iron, 2-sorkel, titanium-cin, hom Graphitizing catalysts such as carbides and oxides can be used. Of these, iron or ketonic compounds are preferred. Also, carbide is preferred as the chemical structure of the compound.
- the addition amount of these graphitization catalysts is preferably 150% by weight, if the total amount of ground matter and graphitization catalyst mixed with the graphitization catalyst is 100% by weight, and if it is 530% by weight, More preferred is 720 wt.%, And even more preferred. If the amount of the graphitization catalyst is less than 1% by weight, the growth of crystallization of the produced graphite particles is not only deteriorated, but the specific surface area tends to be large, and if it exceeds ⁇ ⁇ 0 or 50% by weight
- the graphitization catalyst used in the present invention is preferably in the form of powder, preferably in the form of powder having an average particle diameter of 0.10 nm, preferably in the range of 1 to 100 m.
- the mixture is fired and graphitized.
- the mixture of the ground product and the graphitized catalyst may be formed into a predetermined shape by a press or the like and then fired. .
- the molding pressure is preferably about 13.0 MPa.
- the baking is preferably performed under the condition that the mixture is difficult to oxidize, for example, in a nitrogen atmosphere, an argon atmosphere The method of baking in air
- the temperature of graphitization is preferably 200 ° C. or higher, more preferably 250 ° C. or higher, and more preferably 2700 ° C.
- the temperature is 2800 to 3200 ° C.
- the graphitization temperature is low, the development of the graphite crystal is poor, and the discharge capacity tends to be low, and the graphitization catalyst added with it tends to remain in the produced graphite particles. If a large amount of graphitized catalyst remains in the produced graphite particles, the discharge capacity per weight of the graphite particles tends to decrease. If the graphitization temperature is too high, the graphite tends to sublime.
- the apparent density of the molded product after graphitization is preferably 165 g Z cm 3 or less, and 1.5 5 g Z cm 3 rather than the preferred Ri by equal to or less than, 1. 5 0 g Z cm 3 rather than the preferred in La is equal to or less than, 1. AS g Z cm 3 particularly preferred arbitrariness equal to or less than.
- the lower limit is preferably 1. OO g Z cm 3 or more. If the apparent density of the shaped product after graphitization exceeds 165 cm 3 , the specific surface area of the produced graphite particles tends to be large.
- the apparent density of the shaped product after graphitization is less than 1.0 O g Z cm 3 , (0 0 2) / of the mixture layer containing the graphite particles of the negative electrode and the organic binder obtained. Not only the ratio tends to increase (110), but also the handleability of the shaped product after graphitization tends to decrease. In addition, the furnace filling weight at the time of graphitization tends to decrease and the graphitization processing efficiency to deteriorate.
- the apparent density of the shaped product after graphitization can be calculated from the measured values of the weight and volume of the shaped product after graphitization.
- the apparent density of the molded product after graphitization may be adjusted, for example, by appropriately adjusting the particle size of the ground product to be mixed with the graphitization catalyst and the pressure when molding into a predetermined shape using a press or the like. You can change it.
- the resultant is pulverized, and the particle size is adjusted to form graphite particles forming a negative electrode.
- the pulverizing method is not particularly limited, and examples thereof include impact pulverizing methods such as a jet mill, a hammer mill, and a pin mill.
- the average particle diameter of the graphite particles after powdering is preferably 1 to 100 nm ⁇ , 5 to 5
- 0 m force s is preferable, 10 to 30 m is particularly preferable o
- the average particle size exceeds 100 m, it is easy to form unevenness on the surface of the negative electrode to be produced
- the average particle diameter can be measured, for example, by a laser single diffraction particle size distribution meter.
- the obtained graphite particles are mixed with an organic 7 ⁇ n agent and a solvent to prepare a mixture, and after appropriately adjusting the viscosity, the mixture is coated on a current collector and dried, and then the current collection is carried out.
- organic binder examples include polyethylene, polyethylene, ethylene propylene terpolymer, butadiene rubber ethylene rubber, butyl rubber, and high molecular weight ⁇ -compound having a large ion conductivity. These are used alone or in combination of two or more. 0
- high-molecular compounds having high ion conductivity examples include, but are not limited to, polyvinyl chloride, polyethylene oxide F, polyhydropolin, polyphasic resin, polyacrylic ⁇ 2 Etc is used.
- the mixing ratio of the graphite particles to the organic binder is preferably such that the organic binder is used in an amount of 0.5 to 20 parts by weight with respect to 100 parts by weight of the graphite particles.
- ⁇ is preferably used in combination with a thickener.
- the amount of solvent is particularly limited. If the viscosity is adjusted to the desired viscosity, it is preferable to use 30000 parts by weight with respect to 1000 parts by weight of the mixture, which may be used alone or in combination of two or more. Used in combination
- the current collector for example, a foil of nickel, copper or the like, or a metal current collector such as mesh can be used. Integration can be carried out by, for example, a forming method such as a roll press. The pressure for integration may be about 12000 ⁇ a.
- the negative electrode thus obtained is used in a U-type thimble secondary battery.
- the lithium secondary battery of the present invention comprises a positive electrode containing a lithium compound and
- the negative electrode of the present invention is provided, for example, it is possible to place the positive electrode and the negative electrode opposite to each other via the separator and inject the electrolyte. Compared to lithium secondary batteries using the negative electrode of this type, it has high capacity, excellent cycle characteristics and rapid charge / discharge characteristics.
- the positive electrode of Lithium secondary battery of the present invention is not particularly limited in its material including Lithium reduction ⁇ compounds, for example L i N i ⁇ 2 L i
- C oo 2 L i M n 2 0 4 etc. can be used alone or as a mixture, or a U-tim compound in which a part of elements such as C o N i M n is substituted by different elements is used It is also possible.
- lithium compounds containing at least C o are preferred, and it is preferable that N It is more preferable if it is a meat.
- the positive electrode used in the lithium secondary battery according to the present invention contains at least Co and Ni.
- the positive electrode containing C o and N i may be a mixture of L i N i 0 2 and L i c O 2 O 2 , or a lithium compound in which the N i element and / or the C o element is substituted.
- a lithium secondary battery using a lithium compound usually containing Ni for the positive electrode has the problem of a decrease in discharge voltage.
- a lithium secondary battery manufactured by combining the positive electrode and the negative electrode according to the present invention Batteries are preferable because they can suppress the decrease in discharge voltage and improve energy density.
- the U lithium secondary battery generally includes an electrolytic solution containing a lithium compound as well as a positive electrode and a negative electrode.
- an electrolyte for example, L i C 1
- Lithium carbonates such as CH 3 S L 3 L i, CF a SO a L i etc., ethylene carbonate, jetyl carbonate, dimethyl carbonate, methyl ether-pone, propylene-pone, So-called organic electrolytes or solids or polymers dissolved in non-aqueous solvents such as polyethylene glycols, pyrochlores in the mouth, dimethyl ether, tetrahydrofuran, tetrafluoroethylene, etc. It is possible to use gelled so-called polymer electrolytes. These are used alone or in combination of two or more.
- an additive that shows a decomposition reaction at the time of initial charge of the lithium secondary battery to the electrolytic solution.
- the additive include vinylene carbonate, biphenyl, propane / ⁇ and the like, and the addition amount thereof is preferably 0.01% to 5% by weight.
- a nonwoven fabric mainly composed of a polyethylene such as polyethylene and polypropylene, a cloth, a microporous film, or a combination thereof can be used.
- a microporous film having a volume void ratio of 80% or more is preferable.
- the thickness is preferably 5 to 40 / m, more preferably 8 to 30 m,
- 10 to 25 m is particularly preferred. If the thickness is less than 5 m, the thermal stability of the 'J lithium secondary battery tends to decrease, and if it exceeds 40 m, the energy density and rapid charge / discharge characteristics tend to decrease. When the positive and negative electrodes of the lithium secondary battery to be manufactured are not in direct contact with each other, it is necessary to use a separator.
- FIG. 1 shows a schematic front view of a partial cross section of an example of a cylindrical lithium secondary battery.
- a thin plate-shaped positive electrode 1 and a similarly processed negative electrode 2 are laminated via a separator 3 such as a polyethylene microporous film.
- the container is sealed, and the container is sealed by inserting the container into a battery can 7 made of metal or the like.
- the positive electrode 1 is joined to the positive electrode lid 6 through the positive electrode tab 4, and the negative electrode 2 is joined to the battery bottom through the negative electrode tab 5.
- the positive electrode lid 6 is fixed to the battery can (positive electrode can) 7 by a gasket 8.
- Example 8 Example 8
- the mixture is pulverized to an average particle size of 25 m, and 80 parts by weight of the powder and 20 parts by weight of silicon carbide having an average particle size of 25 am are mixed in a blender, and the mixture is It was placed in a mold, pressed at 100 MP a, and formed into a rectangular solid.
- the compact was heat-treated at 1000 in a nitrogen atmosphere, and further heat-treated at 300 ° C. in a nitrogen atmosphere to obtain a graphite compact. Furthermore, the graphite compact was pulverized to obtain graphite particles.
- the average particle diameter was determined to be the average particle diameter at 50% D using a laser diffraction particle size distribution analyzer (Shimadzu Corporation product name: S A L D — 300).
- the interlayer distance d (0 0 2) was measured using an X-ray diffractometer, C u- ⁇ ⁇ -ray was made monochromatic with Ni foil, and high purity silicon was used as a standard substance.
- the specific surface area was calculated according to the BET method by measuring nitrogen adsorption at a liquid nitrogen temperature by a multipoint method using a product name product A S A P 2 0 10 0.
- the (1002) and (110) diffraction peaks of the mixture layer of the graphite particles and the organic binder obtained from the test electrode (negative electrode) were measured with an X-ray diffractometer, and each peak top was measured. From the strength, the (7) (0 0 2) / (1 0 0) strength ratio was measured. Table 1 shows the results.
- the X-ray source Cu K fringe Z 4 0 KV Z 2 0 m A, step width 0.02 °.
- the prepared sample electrode (negative electrode) was punched out to a size of 2 cm 2 and subjected to constant current charge / discharge by the three-terminal method, and the charge / discharge capacity and the discharge capacity retention ratio were measured as described below.
- Figure 2 shows a schematic of the lithium secondary battery used in this measurement. Evaluation of the sample electrode (negative electrode) is beaker-type glass cell 9 Remind as in FIG.
- Table 1 shows the results of each measurement.
- Example 2 Example 1 and Example 1 except that the density of the mixture layer of graphite particles and PVDF was changed to 1.4 g / cm 3 by changing the pressure of the vertical press to 2 3 MP a instead of 1 OMP a.
- a test electrode negative electrode was prepared in the same manner, and in the same manner as in Example 1, (0.02) / (110) intensity ratio, discharge capacity per unit volume, 100 cycles. The discharge capacity maintenance rate after that, and the discharge capacity maintenance rate at a discharge current of 6.0 mA ⁇ cm 2 were measured. Table 1 shows the measurement results.
- a test electrode (negative electrode) was prepared in the same manner as in Example 1, except that the density of the mixture layer of graphite particles and PVDF was changed to 1.
- SS g Z cm 3 by setting the pressure of the vertical press to 3 IMP a.
- the intensity ratio, discharge capacity per unit volume, discharge capacity retention rate after 100 cycles, discharge current 6 The discharge capacity retention rate at 0 mA / cm 2 was measured. Table 1 shows the measurement results.
- the test electrode (negative electrode) was prepared in the same manner as in Example 1 except that the density of the mixture layer of the graphite particles and the PVDF was changed to 1.5 cm 3 by setting the pressure of the vertical press to 5 OMP a.
- the intensity ratio, the discharge capacity per unit volume, the discharge capacity retention ratio after 100 cycles, and the discharge current were prepared in the same manner as in Example 1.
- the discharge capacity retention rate at 0 mA cm 2 was measured. Table 1 shows the measurement results.
- a test electrode (negative electrode) was prepared in the same manner as in Example 1, except that the density of the mixture layer of the graphite particles and the PVDF was changed to 1.5 gcm 3 by setting the pressure of the vertical press to 85 MP a. Made, and with Example 1 In the same manner, the (0.02) / (110) intensity ratio, the discharge capacity per unit volume, the discharge capacity retention ratio after 100 cycles, the discharge current 6.0 m AZ cm 2 The discharge capacity retention rate was measured. Table 1 shows the measurement results.
- a test electrode (negative electrode) was prepared in the same manner as in Example 1, except that the density of the mixture layer of the graphite particles and the PVDF was changed to 1.5 cm 3 by setting the pressure of the vertical press to 14 3 MP a.
- the intensity ratio, discharge capacity per unit volume, discharge capacity retention rate after 100 cycles, discharge current were prepared in the same manner as in Example 1. 6. 0 m was measured a Roh cm discharge capacity retention ratio of 2:00. Table 1 shows the measurement results.
- Scaled natural graphite particles were produced by crushing Chinese natural graphite with a jet mill.
- the average particle size, specific surface area, aspect ratio, d (0 0 2), L c (0 0 2) measurement results of the graphite particles are also shown in Table 1.
- the test electrode (negative electrode) was prepared in In the same manner as in Example 1, the intensity ratio, discharge capacity per unit volume, discharge capacity maintenance rate after 100 cycles, discharge current 6. 0 m A The discharge capacity retention rate at cm 2 was measured. Table 1 shows the measurement results.
- the density of the mixture layer of graphite particles and PVDF is 1.5 O g Z cm 3 except that the pressure of the vertical press is 27 MP a.
- a test electrode (negative electrode) was prepared in the same manner as in Example 7, and in the same manner as in Example 1, the intensity ratio, discharge capacity per unit volume, (0 0 2) / (1 0 0), 10 The discharge capacity maintenance rate after 0 cycles and the discharge capacity maintenance rate at a discharge current of 6.0 mA cm 2 were measured. Table 1 shows the measurement results.
- the test electrode was prepared in the same manner as in Example 7 except that the density of the mixture layer of graphite particles and PVDF was changed to 1.6 g Z cm 3 by setting the pressure of the vertical press to 42 MP a.
- the negative electrode is prepared, and in the same manner as in Example 1, the intensity ratio, the discharge capacity per unit volume, the discharge capacity retention after 100 cycles, the discharge capacity, and the discharge capacity per unit volume are obtained.
- the discharge capacity maintenance rate was measured at a current of 6.0 mA cm 2 . Table 1 shows the measurement results.
- the negative electrode for lithium secondary battery of the present invention is high in capacity, excellent in cycle characteristics and rapid discharge characteristics, and is suitable for use in lithium secondary batteries. It was done. Industrial Applicability
- a negative electrode for lithium secondary batteries excellent in cycle characteristics and rapid discharge characteristics can be obtained, which is suitable for use in high capacity lithium secondary batteries.
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Abstract
Description
Claims
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HUE04702821A HUE038917T2 (hu) | 2004-01-16 | 2004-01-16 | Negatív elektróda lítiumakkumulátorhoz, és lítiumakkumulátor |
KR1020147020515A KR20140108697A (ko) | 2004-01-16 | 2004-01-16 | 리튬 이차전지용 음극 및 리튬 이차전지 |
EP04702821.2A EP1720211B8 (en) | 2004-01-16 | 2004-01-16 | Negative electrode for lithium secondary battery and lithium secondary battery |
PCT/JP2004/000301 WO2005069410A1 (ja) | 2004-01-16 | 2004-01-16 | リチウム二次電池用負極及びリチウム二次電池 |
JP2005516947A JP4760379B2 (ja) | 2004-01-16 | 2004-01-16 | リチウム二次電池用負極及びリチウム二次電池 |
CNB2004800404550A CN100421285C (zh) | 2004-01-16 | 2004-01-16 | 锂二次电池用负极和锂二次电池 |
KR1020137002590A KR20130024968A (ko) | 2004-01-16 | 2004-01-16 | 리튬 이차전지용 음극 및 리튬 이차전지 |
CA002553707A CA2553707A1 (en) | 2004-01-16 | 2004-01-16 | Negative electrode for lithium secondary battery and lithium secondary battery |
US10/586,304 US7906240B2 (en) | 2004-01-16 | 2004-01-16 | Negative electrode for lithium secondary battery and lithium secondary battery |
KR1020117017253A KR20110092359A (ko) | 2004-01-16 | 2004-01-16 | 리튬 이차전지용 음극 및 리튬 이차전지 |
KR1020067014989A KR101074210B1 (ko) | 2004-01-16 | 2006-07-25 | 리튬 이차전지용 음극 및 리튬 이차전지 |
US12/914,215 US10651458B2 (en) | 2004-01-16 | 2010-10-28 | Negative electrode for lithium secondary battery and lithium secondary battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/000301 WO2005069410A1 (ja) | 2004-01-16 | 2004-01-16 | リチウム二次電池用負極及びリチウム二次電池 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/586,304 A-371-Of-International US7906240B2 (en) | 2004-01-16 | 2004-01-16 | Negative electrode for lithium secondary battery and lithium secondary battery |
US12/914,215 Continuation US10651458B2 (en) | 2004-01-16 | 2010-10-28 | Negative electrode for lithium secondary battery and lithium secondary battery |
Publications (1)
Publication Number | Publication Date |
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WO2005069410A1 true WO2005069410A1 (ja) | 2005-07-28 |
Family
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Family Applications (1)
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PCT/JP2004/000301 WO2005069410A1 (ja) | 2004-01-16 | 2004-01-16 | リチウム二次電池用負極及びリチウム二次電池 |
Country Status (8)
Country | Link |
---|---|
US (2) | US7906240B2 (ja) |
EP (1) | EP1720211B8 (ja) |
JP (1) | JP4760379B2 (ja) |
KR (4) | KR20140108697A (ja) |
CN (1) | CN100421285C (ja) |
CA (1) | CA2553707A1 (ja) |
HU (1) | HUE038917T2 (ja) |
WO (1) | WO2005069410A1 (ja) |
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US9627682B2 (en) | 2012-12-26 | 2017-04-18 | Sanyo Electric Co., Ltd. | Negative electrode for nonaqueous electrolyte secondary batteries and nonaqueous electrolyte secondary battery including the same |
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JP2009238584A (ja) * | 2008-03-27 | 2009-10-15 | Hitachi Chem Co Ltd | リチウムイオン二次電池負極用炭素粒子、リチウムイオン二次電池用負極及びリチウムイオン二次電池 |
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KR101985979B1 (ko) * | 2012-03-30 | 2019-06-04 | 가부시키가이샤 무라타 세이사쿠쇼 | 전지, 전지용 음극, 전지 팩, 전자 장치, 전동 차량, 축전 장치, 및 전력 시스템 |
US9627682B2 (en) | 2012-12-26 | 2017-04-18 | Sanyo Electric Co., Ltd. | Negative electrode for nonaqueous electrolyte secondary batteries and nonaqueous electrolyte secondary battery including the same |
JP6206611B1 (ja) * | 2017-03-03 | 2017-10-04 | Tdk株式会社 | 負極およびリチウムイオン二次電池 |
JP2018147672A (ja) * | 2017-03-03 | 2018-09-20 | Tdk株式会社 | 負極およびリチウムイオン二次電池 |
Also Published As
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EP1720211A1 (en) | 2006-11-08 |
US20070190423A1 (en) | 2007-08-16 |
EP1720211B8 (en) | 2018-04-25 |
HUE038917T2 (hu) | 2018-12-28 |
KR20140108697A (ko) | 2014-09-12 |
CA2553707A1 (en) | 2005-07-28 |
CN1906780A (zh) | 2007-01-31 |
JP4760379B2 (ja) | 2011-08-31 |
KR101074210B1 (ko) | 2011-10-14 |
US7906240B2 (en) | 2011-03-15 |
US10651458B2 (en) | 2020-05-12 |
EP1720211A4 (en) | 2010-02-17 |
KR20110092359A (ko) | 2011-08-17 |
CN100421285C (zh) | 2008-09-24 |
EP1720211B1 (en) | 2018-03-07 |
KR20060129310A (ko) | 2006-12-15 |
US20110045353A1 (en) | 2011-02-24 |
KR20130024968A (ko) | 2013-03-08 |
JPWO2005069410A1 (ja) | 2007-08-23 |
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