WO2018236168A1 - Batterie secondaire au lithium - Google Patents

Batterie secondaire au lithium Download PDF

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Publication number
WO2018236168A1
WO2018236168A1 PCT/KR2018/007042 KR2018007042W WO2018236168A1 WO 2018236168 A1 WO2018236168 A1 WO 2018236168A1 KR 2018007042 W KR2018007042 W KR 2018007042W WO 2018236168 A1 WO2018236168 A1 WO 2018236168A1
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Prior art keywords
lithium
lithium metal
positive electrode
group
active material
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PCT/KR2018/007042
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English (en)
Korean (ko)
Inventor
박은경
장민철
윤석일
손병국
최정훈
정보라
Original Assignee
주식회사 엘지화학
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Priority claimed from KR1020180070926A external-priority patent/KR102093971B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to EP18819917.8A priority Critical patent/EP3550638A4/fr
Priority to JP2019549522A priority patent/JP2020510292A/ja
Priority to CN201880020644.3A priority patent/CN110476279B/zh
Priority to US16/474,303 priority patent/US11322731B2/en
Publication of WO2018236168A1 publication Critical patent/WO2018236168A1/fr

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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
    • 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
    • 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
    • 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
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • 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

Definitions

  • the present invention relates to a lithium secondary battery having an anode-free structure using a high irreversible anode material.
  • the lithium metal has a low redox potential (-3.045 V versus the standard hydrogen electrode) and a large weight energy density (3,860 mAhg -1 ), which is expected as a cathode material for high capacity secondary batteries.
  • lithium metal when used as a battery cathode, a battery is manufactured by attaching a lithium foil on a flat current collector. Lithium reacts explosively with water because it is highly reactive as an alkali metal and reacts with oxygen in the atmosphere It is difficult to manufacture and use in a general environment.
  • lithium metal when exposed to the atmosphere, it has an oxide film such as LiOH, Li 2 O, Li 2 CO 3 or the like as a result of oxidation.
  • the oxide film acts as an insulating film to lower the electrical conductivity and hinder the smooth movement of lithium ions, thereby increasing the electrical resistance.
  • the present invention provides a lithium secondary battery comprising a positive electrode, a negative electrode and a separator interposed therebetween and an electrolyte, wherein the negative electrode is moved from the highly irreversible positive electrode active material having an initial irreversible capacity of 50% And a lithium metal is formed on the negative electrode current collector.
  • the lithium metal formed on the anode current collector is formed through one charge at a voltage of 4.5V to 2.5V.
  • the cathode may further include a protective film on a surface in contact with the separation membrane.
  • the lithium secondary battery according to the present invention is coated in a state that it is shielded from the atmosphere through the process of forming the lithium metal layer on the anode current collector, the formation of the surface oxide film due to oxygen and moisture in the atmosphere of lithium metal can be suppressed And as a result, the cycle life characteristics are improved.
  • FIG. 1 is a schematic view of a lithium secondary battery manufactured according to a first embodiment of the present invention.
  • Li + lithium ions
  • FIG. 3 is a schematic diagram of a lithium secondary battery manufactured according to a first embodiment of the present invention after initial charging of the lithium secondary battery has been completed.
  • FIG. 4 is a schematic view of a lithium secondary battery manufactured according to a second embodiment of the present invention.
  • FIG. 5 is a schematic diagram showing the movement of lithium ions (Li + ) during the initial charging of a lithium secondary battery manufactured according to the second embodiment of the present invention.
  • FIG. 6 is a schematic view of a lithium secondary battery manufactured according to a second embodiment of the present invention after initial charging is completed.
  • FIG. 6 is a schematic view of a lithium secondary battery manufactured according to a second embodiment of the present invention after initial charging is completed.
  • FIG. 1 is a cross-sectional view of a lithium secondary battery manufactured according to a first embodiment of the present invention, and includes a cathode including a cathode current collector 11 and a cathode mixture 13; A negative electrode including an anode current collector 21; And a separator 30 and an electrolyte (not shown) interposed therebetween.
  • the negative electrode of the lithium secondary battery is usually formed on the negative electrode current collector 21.
  • the negative electrode current collector 21 is used alone to assemble the negative electrode pre-battery structure, ) Forms lithium metal (not shown) as a negative electrode mixture on the negative electrode current collector 21 to form a negative electrode having a structure of a known negative electrode current collector / negative electrode coater, Respectively.
  • the negative electrode pre-battery compartment may be a negative electrode-free battery in which no negative electrode is formed on the negative electrode current collector at the time of initial assembly, and a negative electrode may be formed on the negative electrode current collector, It can be a concept that includes all of the cells that are present.
  • the form of the lithium metal formed as the negative electrode mixture on the negative electrode collector may be a form in which the lithium metal is formed as a layer and a structure in which the lithium metal is not formed in the layer A structure in which particles are gathered in the form of particles).
  • the present invention will be described on the basis of the form of the lithium metal layer 23 formed of the lithium metal layer, but it is clear that the description does not exclude the structure in which the lithium metal is not formed of the layer.
  • FIG. 2 is a schematic diagram showing the movement of lithium ions (Li + ) upon initial charging of a lithium secondary battery manufactured in accordance with the first embodiment of the present invention, and FIG. After the initial charging of the secondary battery is completed.
  • lithium ions are removed from the positive electrode mixture 13 in the positive electrode 10, This passes through the separator 30 and moves toward the cathode current collector 21 and forms a cathode 20 by forming a lithium metal layer 23 purely composed of lithium on the cathode current collector 21.
  • the formation of the lithium metal layer 23 through such filling can reduce the thickness of the thin film layer compared to the negative electrode in which the lithium metal layer 23 is sputtered on the conventional anode current collector 21 or the lithium foil and the cathode current collector 21 are joined together. And it is advantageous that the control of the interface characteristics is very easy. In addition, since the bonding strength of the lithium metal layer 23 stacked on the anode current collector 21 is large and stable, there is no problem of being removed from the cathode current collector 21 due to ionization again through discharge.
  • the lithium metal since the lithium metal is not exposed to the atmosphere during the cell assembly process, the problem of problems such as formation of oxide film on the surface due to high reactivity of lithium itself and deterioration of lifetime of the lithium secondary battery due to the high reactivity It can be blocked at its source.
  • the lithium secondary battery having such a negative electrode free structure can be realized by various methods, but in the present invention, it is ensured by controlling the composition used for the positive electrode mix 13.
  • the positive electrode active material used in the present invention is not particularly limited as long as the positive electrode active material is a material capable of absorbing and desorbing lithium ions, A lithium transition metal oxide is typically used as a cathode active material capable of realizing a battery having excellent discharge efficiency.
  • lithium transition metal oxide a layered compound such as lithium cobalt oxide (LiCoO 2 ) or lithium nickel oxide (LiNiO 2 ), which contains two or more transition metals and is substituted with, for example, at least one transition metal;
  • LiCoO 2 lithium cobalt oxide
  • LiNiO 2 lithium nickel oxide
  • a lithium nickel oxide, a spinel-based lithium nickel manganese composite oxide, a spinel-based lithium manganese oxide in which a part of Li is substituted with an alkaline earth metal ion, an olivine-based lithium metal phosphate, and the like is not limited to these.
  • the lithium transition metal oxide is used for the positive electrode material mixture 13 together with a binder and a conductive material as a positive electrode active material.
  • the lithium source for forming the lithium metal layer 23 becomes the lithium transition metal oxide. That is, when the lithium ion in the lithium transition metal oxide is charged in a voltage range within a certain range, the lithium ion is desorbed to form the lithium metal layer 23 on the anode current collector 21.
  • the lithium ion in the lithium transition metal oxide is not easily released or the lithium metal layer 23 can not be formed due to the absence of lithium that can be involved in charging and discharging at the operating voltage level, and only the lithium transition metal oxide
  • the irreversible capacity is largely lowered and the capacity and lifetime characteristics of the lithium secondary battery are deteriorated.
  • the initial charge capacity is 200 mAh / g or more
  • a lithium metal compound which is a highly irreversible substance having an initial irreversible capacity of 30% or more.
  • the term 'high irreversible substance' referred to in the present invention may be used in the same manner as 'high capacity irreversible substance' in other terms.
  • irreversible capacity (first cycle charge capacity - first cycle discharge capacity) of the first cycle of charge and discharge may be large.
  • the irreversible capacity of the generally used cathode active material is about 2 to 10% of the initial charging capacity.
  • the lithium metal compound as the highly irreversible material that is, the initial irreversible capacity is 30% or more, preferably 50% Lithium metal compounds may be used together.
  • the lithium metal compound may have an initial charge capacity of 200 mAh / g or more, preferably 230 mAh / g or more. The use of such a lithium metal compound serves as a lithium source capable of forming the lithium metal layer 23 while enhancing the irreversible capacity of the lithium transition metal oxide as the cathode active material.
  • the lithium metal compound represented by the present invention can be represented by the following chemical formulas (1) to (8).
  • a ⁇ 1 and M 1 is at least one element selected from the group consisting of Mn, Fe, Co, Cu, Zn, Mg and Cd)
  • M 2 is P, B, C, Al, Sc, Sr, Ti, V, Zr, Mn, Fe, Co, Cu, Zn, Cr, Mg, Nb, Mo, and Cd.
  • M < 4 > is at least one element selected from the group consisting of Cu and Ni).
  • 0.5, -0.1? H? 0.5 and M 5 is at least one element selected from the group consisting of Mn, Fe, Co, Cu, Zn, Mg and Cd to be)
  • M 6 is at least one element selected from the group consisting of Cr, Al, Ni, Mn, and Co.
  • M 7 is at least one element selected from the group consisting of Cr, Al, Ni, Mn, and Co
  • M 8 represents an alkaline earth metal
  • k / (k + m + n) is from 0.10 to 0.40
  • m / (k + m + n) is 0.20 to 0.50
  • n / (k + m + n) is 0.20 to 0.50.
  • the lithium metal compounds represented by Chemical Formulas 1 to 8 differ in irreversible capacity depending on the structure thereof, and they can be used singly or in combination, and serve to increase the irreversible capacity of the cathode active material.
  • the irreversible capacity of the high irreversible substance represented by the general formulas (1) and (3) varies depending on the kind thereof.
  • the irreversible capacity is as shown in Table 1 below.
  • the lithium metal compound represented by the general formula (2) preferably belongs to the space group Immm.
  • the Ni, M composite oxide forms a planar tetrahedral coordination (Ni, M) O4 and the side (Side formed with OO) and forms a primary chain.
  • the lithium metal compound of formula (8) has an alkaline earth metal content of 30 to 45 atomic% and a nitrogen content of 30 to 45 atomic%. When the content of the alkaline earth metal and the content of nitrogen are within the above ranges, the thermal characteristics and lithium ion conduction characteristics of the compound of Formula 1 are excellent.
  • M / (k + m + n) is in the range of 0.30 to 0.45, for example, 0.31 to 0.33, n / (k + m + n) is 0.30 to 0.45, for example, 0.31 to 0.33.
  • a is 0.5 to 1
  • b is 1
  • c is 1 according to an embodiment of the present invention.
  • the positive electrode mixture (13) according to the present invention requires that the content of the positive electrode active material and the lithium metal compound be limited. That is, the parameters influenced by the content of the lithium metal compound are the thickness of the lithium metal layer 23 and the loading amount in the cathode active material, and they are in a trade-off relationship with each other.
  • the positive electrode mixture 13 of the present invention is used in a weight ratio of the positive electrode active material: lithium metal compound of 1: 9 to 9: 1, 2: 8 to 8: 2, 3: 7 to 7:
  • the lithium metal compound is used within 70% of the total weight of the positive electrode mixture.
  • the cathode active material: lithium metal compound in a weight ratio range of 9: 1 to 3: 7.
  • the positive electrode mixture of the present invention has a loading amount of 1 to 10 mAh / cm 2 , preferably a loading amount of 2 to 10 mAh / cm 2 , more preferably 3 to 10 mAh / cm < 2 & gt ;.
  • the lithium secondary battery of the present invention can form a secondary battery in which lithium is formed on the cathode after the first charge using the positive electrode mixture as described above.
  • the lithium metal compounds of the above Chemical Formulas 1 to 8 are characterized in that irreversible capacity of the anode is controlled so that capacity recovery of 90% or more after the over discharge test can be achieved without decreasing the capacity of the battery.
  • the lithium metal compound releases 1 mole or more of lithium ions upon first cycle charging and can store and release lithium ions of 1 mole or less in the first cycle discharge and subsequent cycles. Therefore, when the lithium metal compound is added to the positive electrode, Li is formed in the negative electrode by the irreversible capacity of the positive electrode, so that an excess amount of excess Li can be formed by the desired amount in the first cycle.
  • the cathode active material according to the present invention includes a lithium transition metal oxide and a lithium metal compound represented by the following general formula (1) to (8), and the form thereof is not particularly limited as long as lithium can be irreversibly released from the lithium metal sulfur compound no.
  • the cathode active material and the lithium metal compound may be dispersed in the cathode mixture 13 in a mixed state with each other, or may be formed into a core-shell structure.
  • the core may be a cathode active material or a lithium metal compound
  • the shell may be a lithium metal or a cathode active material.
  • these mixture forms can form the core and the shell, respectively.
  • the shell may be formed as a single layer or multiple layers.
  • lithium ions can easily be desorbed from the lithium metal compound by charging the battery.
  • the lithium metal compound may be applied on the collector in a state mixed with the cathode active material.
  • a first coating layer including a cathode active material is coated on the current collector, and a coating layer containing a lithium metal compound may be coated on the first coating layer.
  • the first coating layer is composed of a cathode active material, a conductive material, and a binder
  • the second coating layer is composed of a lithium metal compound, a conductive material, and a binder, It can be converted into an irreversible state in the activation process and act as a protective layer of the first coating layer.
  • the second coating layer is thermally and electrochemically stable in the form of a metal sulfur compound in which lithium is exfoliated from the lithium metal compound, thereby protecting the first coating layer by suppressing side reactions of the electrode and the electrolyte.
  • the positive electrode active material having such simple mixing and core-shell structure is used in accordance with the above-mentioned contents.
  • LixVO of a material for example a known to increase the irreversible capacity, Li 3 Fe 2 (PO 4 ) 3, Li 3 Fe 2 (SO 4) 3 , Li 3 V (PO 4 ) 3 , or a material such as MnO 2 , MoO 3 , VO 2 , V 2 O 5 , V 6 O 13 , Cr 3 O 8 , CrO 2 , Al 2 O 3 , ZrO 2 , 4 , SiO 2 , TiO 2 , and MgO may be additionally used.
  • a material for example a known to increase the irreversible capacity
  • Li 3 Fe 2 (PO 4 ) 3, Li 3 Fe 2 (SO 4) 3 Li 3 V (PO 4 ) 3
  • a material such as MnO 2 , MoO 3 , VO 2 , V 2 O 5 , V 6 O 13 , Cr 3 O 8 , CrO 2 , Al 2 O 3 , ZrO 2 , 4 , SiO 2 , TiO 2 , and MgO
  • These materials are used in an amount of not more than 60 parts by weight, not more than 50 parts by weight, preferably not more than 40 parts by weight, based on 100 parts by weight of the cathode active material.
  • the charging range for forming the lithium metal layer 23 is one charging at 0.01 to 0.2 C in the voltage range of 4.5 to 2.5V. If the charging is performed below the above range, the formation of the lithium metal layer 23 becomes difficult. On the other hand, if the charging is carried out above the above range, damage of the cell occurs, It does not.
  • the lithium metal layer 23 thus formed forms a uniform continuous or discontinuous layer on the cathode current collector 21.
  • the anode current collector 21 when the anode current collector 21 is in the form of a foil, it may have a continuous thin film form, and when the anode current collector 21 has a three-dimensional porous structure, the lithium metal layer 23 may be discontinuously formed . That is, the discontinuous layer is distributed discontinuously, and a region where the lithium metal layer 23 exists and a region where the lithium metal layer 23 does not exist exist in a specific region, and a region where the lithium metal layer 23 is not present exists in the region where the lithium compound exists And the region in which the lithium metal layer 23 is present is distributed without continuity, by distributing the region where the lithium metal layer 23 is present, such as an island type.
  • the lithium metal layer 23 formed through such charging and discharging has a thickness of at least 50 nm and not more than 100 mu m, and preferably 1 mu m to 50 mu m for the function as a cathode. If the thickness is less than the above range, the life of the battery charge / discharge cycle is drastically reduced. On the other hand, when the thickness exceeds the above range, the lifetime characteristics and the like are stable, but the energy density of the battery is lowered.
  • the lithium metal layer 23 proposed in the present invention can be manufactured as a negative electrode-free battery without lithium metal at the time of assembling the battery, so that compared with the lithium secondary battery assembled using the conventional lithium foil, No or little oxide layer is formed on the lithium metal layer 23 due to the reactivity. Thus, degradation of life of the battery due to the oxidation layer can be prevented.
  • the lithium metal layer 23 is moved by the filling of the highly irreversible material, which can form a more stable lithium metal layer 23 as compared with the case where the lithium metal layer 23 is formed on the anode.
  • a lithium metal is attached on the anode, a chemical reaction between the anode and the lithium metal may occur.
  • the positive electrode mixture 13 contains the above-mentioned positive electrode active material and a lithium metal compound.
  • the positive electrode mixture 13 further includes a conductive material, a binder, and other additives commonly used in lithium secondary batteries .
  • the conductive material is used to further improve the conductivity of the electrode active material.
  • a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskers such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Polyphenylene derivatives and the like can be used.
  • a binder may be further included for bonding the positive electrode active material, the lithium metal compound, and the conductive material to the current collector.
  • the binder may include a thermoplastic resin or a thermosetting resin.
  • a thermoplastic resin for example, there may be mentioned polyethylene, polypropylene, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), styrene-butadiene rubber, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, vinylidene fluoride- Hexafluoropropylene copolymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, ethylene-tetrafluoroethylene copolymer, polychlorotrifluoroethylene, vinylidene fluoride-pentafluoropropylene copolymer, propylene-tetrafluoroethylene copolymer Ethylene-chlorotrifluoroethylene cop
  • the filler is optionally used as a component for suppressing the expansion of the electrode, and is not particularly limited as long as it is a fibrous material without causing a chemical change in the battery.
  • an olefin polymer such as polyethylene or polypropylene, or a fibrous material such as glass fiber or carbon fiber is used.
  • the positive electrode mixture (13) of the present invention is formed on the positive electrode collector (11).
  • the cathode current collector is generally made to have a thickness of 3 to 500 mu m.
  • the cathode current collector 11 is not particularly limited as long as it has high conductivity without causing chemical change in the lithium secondary battery.
  • Examples of the cathode current collector 11 include stainless steel, aluminum, nickel, titanium, sintered carbon, Surface-treated with carbon, nickel, titanium, silver, or the like may be used.
  • the cathode current collector 11 may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric having fine irregularities formed on its surface so as to increase the adhesive force with the cathode active material.
  • the method of applying the positive electrode mixture 13 on the current collector may be a method of uniformly dispersing the electrode mixture slurry on the current collector using a doctor blade or the like, a method of die casting, a comma coating method, a screen printing method, and the like.
  • the electrode mixture slurry may be formed on a separate substrate and then bonded to the current collector by a pressing or lamination method, but the present invention is not limited thereto.
  • the negative electrode collector 21 constituting the negative electrode is generally made to have a thickness of 3 ⁇ to 500 ⁇ .
  • the anode current collector 21 is not particularly limited as long as the anode current collector 21 in which the lithium metal layer 23 can be formed by charging is conductive and does not cause a chemical change in the lithium secondary battery.
  • Examples of the surface treatment include surface treatment of surfaces of copper, stainless steel, aluminum, nickel, titanium, sintered carbon, copper or stainless steel with carbon, nickel, titanium or silver, or aluminum-cadmium alloy.
  • the anode current collector 21 may be formed in various shapes such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric having fine irregularities on its surface.
  • a protective film 55 may be additionally formed on a surface of the negative electrode in contact with the separator 60. Specifically, a protective film 55 may be formed on the surface of the anode current collector 51 in contact with the separator 60 in the cathode.
  • the lithium metal layer 23 is formed so that lithium ions transferred from the positive electrode mixture 43 pass through the protective film 55 and are formed on the negative electrode collector 51 do.
  • the protective film 55 may be any material capable of smoothly transferring lithium ions, and may be a material used for a lithium ion conductive polymer and / or an inorganic solid electrolyte. If necessary, the protective film 55 may further include a lithium salt have.
  • the lithium ion conductive polymer there may be mentioned, for example, polyethylene oxide (PEO), polyacrylonitrile (PAN), polymethylmethacrylate (PMMA), polyvinylidene fluoride (PVDF), polyvinylidene fluoride- (PVDF-HFP), LiPON, Li 3 N, LixLa 1 -x TiO 3 (0 ⁇ x ⁇ 1) and Li 2 S-GeS-Ga 2 S 3 ,
  • PEO polyethylene oxide
  • PAN polyacrylonitrile
  • PMMA polymethylmethacrylate
  • PVDF polyvinylidene fluoride
  • PVDF-HFP polyvinylidene fluoride-
  • LiPON Li 3 N
  • LixLa 1 -x TiO 3 (0 ⁇ x ⁇ 1
  • Li 2 S-GeS-Ga 2 S 3 Li 2 S-GeS-Ga 2 S 3
  • the present invention is not limited thereto, and any polymer having lithium ion conductivity may be used without limitation
  • the formation of the protective film 55 using the lithium ion conductive polymer is accomplished by preparing a coating solution in which the lithium ion conductive polymer is dissolved or swollen in a solvent and then coating the negative electrode current collector 51.
  • the method for applying the anode current collector 51 may be selected from known methods or a new suitable method in view of the characteristics of the material and the like.
  • the polymer protective layer composition is dispersed on a current collector and uniformly dispersed using a doctor blade or the like.
  • a method of performing the distribution and dispersion processes in a single process may be used.
  • various coating methods such as dip coating, gravure coating, slit die coating, spin coating, comma coating, bar coating, reverse roll coating reverse roll coating, screen coating, cap coating and the like.
  • the anode current collector 51 is the same as that described above.
  • the drying process may be performed on the protective film 55 formed on the anode current collector 51.
  • the drying process may be a heat treatment at a temperature of 80 to 120 ° C, depending on the type of the solvent used in the lithium ion conductive polymer Or by hot air drying or the like.
  • the solvent to be used is preferably similar to the lithium ion conductive polymer in terms of solubility index, and has a low boiling point. This is because the mixing can be made uniform and then the solvent can be easily removed.
  • a solvent such as N, N-dimethylacetamide (DMAc), dimethyl sulfoxide (DMSO), N, N-dimethylformamide (DMF) acetone, tetrahydrofuran, methylene chloride, chloroform, dimethylformamide, N-methyl-2-pyrrolidone (NMP) Cyclohexane, water or a mixture thereof can be used as a solvent.
  • the lithium ion conductive polymer may further include a material used for this purpose in order to further increase the lithium ion conductivity.
  • the inorganic solid electrolyte is a ceramic-based material, a crystalline or amorphous and crystalline materials can be used, Thio-LISICON (Li 3. 25 Ge 0 .25 P 0. 75 S 4), Li 2 S-SiS 2, LiI- Li 2 S-SiS 2 , LiI-Li 2 SP 2 S 5 , LiI-Li 2 SP 2 O 5 , LiI-Li 3 PO 4 -P 2 S 5 , Li 2 SP 2 S 5 , Li 3 PS 4 , Li 7 P 3 S 11 , Li 2 OB 2 O 3 , Li 2 OB 2 O 3 -P 2 O 5 , Li 2 OV 2 O 5 -SiO 2 , Li 2 OB 2 O 3 , Li 3 PO 4 , Li 2 O -Li 2 WO 4 -B 2 O 3 , LiPON, LiBON, Li 2 O-SiO 2, LiI, Li 3 N, Li 5 La 3 Ta 2 O12, Li 7 La 3 Zr 2 O 12,
  • the inorganic solid electrolyte may be mixed with known materials such as a binder and applied in a thick film form through slurry coating. Further, if necessary, the thin film type can be applied through a deposition process such as sputtering.
  • the slurry coating method used may be appropriately selected based on the coating method, the drying method and the content of the solvent mentioned above for the lithium ion conductive polymer.
  • the protective film 55 comprising the above-described lithium ion conductive polymer and / or inorganic solid electrolyte facilitates the formation of the lithium metal layer 23 by increasing the lithium ion transfer rate and at the same time, the lithium metal layer 23 / The effect of suppressing or preventing the generation of lithium dendrite generated when the whole 51 is used as a cathode can be secured at the same time.
  • the thickness of the protective film 55 is required to be limited.
  • the thickness of the protective film 55 may be preferably 10 nm to 50 ⁇ , more preferably 100 nm to 50 ⁇ , and most preferably 1 ⁇ to 50 ⁇ . If the thickness of the protective film 55 is less than the above range, the side reaction and the exothermic reaction between lithium and the electrolyte, which are increased under the conditions of overcharging or high-temperature storage, can not be effectively suppressed and safety can not be improved.
  • the composition of the protective film 55 In the case of the ion conductive polymer, a long time is required for the composition of the protective film 55 to be impregnated or swelled by the electrolytic solution, and the movement of the lithium ion is lowered, thereby deteriorating the overall battery performance.
  • the rechargeable lithium battery of the second embodiment has the same structure as that of the first embodiment except for the protective film 55.
  • the lithium secondary battery includes a cathode 40, a cathode 50, separators 30 and 60 interposed therebetween, and an electrolyte (not shown)
  • the separation membranes 30 and 60 may be omitted.
  • the separators 30 and 60 may be made of a porous substrate.
  • the porous substrate may be any porous substrate commonly used in an electrochemical device.
  • a polyolefin porous film or a nonwoven fabric may be used , And is not particularly limited thereto.
  • the separation membranes 30 and 60 according to the present invention are not particularly limited in their materials and physically separate the positive and negative electrodes and have an electrolyte and an ion permeability and are usually made of a lithium secondary battery as separators 30 and 60
  • Any material may be used without particular limitation, but it is preferably a porous, nonconductive or insulating material, particularly a material having a low resistance against ion movement of the electrolytic solution and an excellent ability to impregnate the electrolytic solution.
  • a polyolefin-based porous membrane or nonwoven fabric may be used, but it is not particularly limited thereto.
  • polyolefin-based porous film examples include polyolefin-based polymers such as polyethylene, polypropylene, polybutylene, and polypentene, such as high-density polyethylene, linear low-density polyethylene, low-density polyethylene and ultra-high molecular weight polyethylene, One can say.
  • polyolefin-based polymers such as polyethylene, polypropylene, polybutylene, and polypentene, such as high-density polyethylene, linear low-density polyethylene, low-density polyethylene and ultra-high molecular weight polyethylene, One can say.
  • the nonwoven fabric may contain, in addition to the polyolefin-based nonwoven fabric, a polyphenylene oxide, a polyimide, a polyamide, a polycarbonate, a polyethyleneterephthalate, a polyethylene naphthalate, Polybutyleneterephthalate, polyphenylenesulfide, polyacetal, polyethersulfone, polyetheretherketone, polyester, and the like may be used alone or in combination of two or more.
  • the nonwoven fabric may be a spunbond or a meltblown fiber composed of long fibers.
  • the nonwoven fabric may be a porous web.
  • the thickness of the separation membrane (30, 60) is not particularly limited, but is preferably in the range of 1 to 100 mu m, more preferably in the range of 5 to 50 mu m. If the thickness of the separation membranes 30 and 60 is less than 1 ⁇ , the mechanical properties can not be maintained. If the separation membranes 30 and 60 are more than 100 ⁇ , the separation membranes 30 and 60 serve as a resistance layer, thereby deteriorating the performance of the battery.
  • the pore size and porosity of the separation membrane (30, 60) are not particularly limited, but the pore size is preferably 0.1 to 50 ⁇ m and the porosity is preferably 10 to 95%. If the pore size of the separator 30 or 60 is less than 0.1 ⁇ m or the porosity is less than 10%, the separator 30 or 60 acts as a resistive layer. If the pore size exceeds 50 ⁇ m or the porosity is 95% The mechanical properties can not be maintained.
  • the electrolyte of the lithium secondary battery is a lithium salt-containing electrolyte, which is a non-aqueous electrolyte consisting of a non-aqueous organic solvent electrolyte and a lithium salt, and may include, but is not limited to, an organic solid electrolyte or an inorganic solid electrolyte.
  • non-aqueous organic solvent examples include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, gamma-butyrolactone, -Dimethoxyethane, 1,2-diethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, 4-methyl-
  • the organic solvent may be selected from the group consisting of diethyl ether, formamide, dimethylformamide, dioxolane, acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivative, Dimethyl-2-imidazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, ethers, methyl propionate, ethyl propionat
  • the electrolyte salt contained in the non-aqueous electrolyte is a lithium salt.
  • the lithium salt can be used without limitation as those conventionally used in an electrolyte for a lithium secondary battery.
  • the lithium salt anion F -, Cl -, Br - , I -, NO 3 -, N (CN) 2 -, BF 4 -, ClO 4 -, PF 6 -, (CF 3) 2 PF 4 -, (CF 3) 3 PF 3 -, (CF 3) 4 PF 2 -, (CF 3) 5 PF -, (CF 3) 6 P -, CF 3 SO 3 -, CF 3 CF 2 SO 3 - , (CF 3 SO 2) 2 N -, (FSO 2) 2 N -, CF 3 CF 2 (CF 3) 2 CO -, (CF 3 SO 2) 2 CH -, (SF 5) 3 C -, ( CF 3 SO 2) 3 C - from the group consisting of -, CF 3
  • organic solvent included in the non-aqueous electrolyte examples include those commonly used in electrolytes for lithium secondary batteries, such as ether, ester, amide, linear carbonate, cyclic carbonate, etc., Can be used. Among them, a carbonate compound which is typically a cyclic carbonate, a linear carbonate, or a mixture thereof may be included.
  • cyclic carbonate compound examples include ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, Propylene carbonate, 2,3-pentylene carbonate, vinylene carbonate, vinylethylene carbonate, and halides thereof, or a mixture of two or more thereof.
  • halides include, but are not limited to, fluoroethylene carbonate (FEC) and the like.
  • linear carbonate compound examples include any one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethyl methyl carbonate (EMC), methyl propyl carbonate and ethyl propyl carbonate And mixtures of two or more of them may be used as typical examples, but the present invention is not limited thereto.
  • ethylene carbonate and propylene carbonate which are cyclic carbonates in the carbonate-based organic solvent, are high-viscosity organic solvents having a high dielectric constant and can dissociate the lithium salt in the electrolyte more easily.
  • cyclic carbonates can be used as dimethyl carbonate and diethyl carbonate When a low viscosity, low dielectric constant linear carbonate is mixed in an appropriate ratio, an electrolyte having a higher electric conductivity can be produced.
  • any one selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methyl propyl ether and ethyl propyl ether or a mixture of two or more thereof may be used , But is not limited thereto.
  • ester in the organic solvent examples include methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate,? -Butyrolactone,? -Valerolactone,? -Caprolactone,? -Valerolactone and? -Caprolactone, or a mixture of two or more thereof, but the present invention is not limited thereto.
  • the injection of the nonaqueous electrolyte solution can be performed at an appropriate stage of the manufacturing process of the electrochemical device according to the manufacturing process and required properties of the final product. That is, it can be applied before assembling the electrochemical device or in the final stage of assembling the electrochemical device.
  • organic solid electrolyte examples include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, Polymers containing ionic dissociation groups, and the like can be used.
  • a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, Polymers containing ionic dissociation groups, and the like can be used.
  • Examples of the inorganic solid electrolyte include Li 3 N, LiI, Li 5 NI 2 , Li 3 N-LiI-LiOH, LiSiO 4 , LiSiO 4 -LiI-LiOH, Li 2 SiS 3 , Li 4 SiO 4 , Nitrides, halides and sulfates of Li such as Li 4 SiO 4 -LiI-LiOH and Li 3 PO 4 -Li 2 S-SiS 2 can be used.
  • non-aqueous electrolytes may be used in the form of, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, glyme, N, N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxyethanol, aluminum trichloride and the like are added It is possible.
  • a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further added to impart nonflammability, or a carbon dioxide gas may be further added to improve high-temperature storage characteristics.
  • the shape of the above-described lithium secondary battery is not particularly limited and may be, for example, a jelly-roll type, a stack type, a stack-folding type (including a stack-Z-folding type), or a lamination- Stack-folding type.
  • An electrode assembly in which the positive electrode, the separator, and the negative electrode are sequentially stacked is prepared, and then inserted into a battery case. Then, an electrolyte is injected into the upper part of the case and sealed with a cap plate and a gasket to assemble a lithium secondary battery .
  • the lithium secondary battery can be classified into various types of batteries such as a lithium-sulfur battery, a lithium-air battery, a lithium-oxide battery, and a lithium total solid battery depending on the type of the anode material and the separator used.
  • Coin type, pouch type, etc. and can be divided into a bulk type and a thin film type depending on the size.
  • the structure and the manufacturing method of these cells are well known in the art, and detailed description thereof will be omitted.
  • the lithium secondary battery according to the present invention can be used as a power source for a device requiring a high capacity and a high rate characteristic.
  • the device include a power tool which is powered by an electric motor and moves; An electric vehicle including an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and the like; An electric motorcycle including an electric bike (E-bike) and an electric scooter (Escooter); An electric golf cart; And a power storage system, but the present invention is not limited thereto.
  • the slurry composition prepared above was coated on a current collector (Al Foil, thickness 20 ⁇ ) and dried at 130 ⁇ for 12 hours to prepare respective positive electrodes.
  • a copper current collector was used for the anode current collector 21.
  • the electrode assembly was manufactured through the separation membrane of porous polyethylene between the anode and the anode current collector 21 manufactured in the above (1), and the electrode assembly was placed inside the case. Then, an electrolyte was injected to manufacture the lithium secondary battery Respectively. At this time, And 1% by weight of LiPF 6 and 2% by weight of VC (Vinylene Carbonate) in an organic solvent having a volume ratio of 1: 2: 1 of ethylene carbonate (EC): diethyl carbonate (DEC) Respectively.
  • VC Vinyl Carbonate
  • the slurry composition prepared above was coated on a current collector (Al Foil, thickness 20 ⁇ ) and dried at 130 ⁇ for 12 hours to prepare respective positive electrodes.
  • a copper current collector was used for the anode current collector 21.
  • the electrode assembly was manufactured through the separation membrane of porous polyethylene between the anode and the anode current collector 21 manufactured in the above (1), and the electrode assembly was placed inside the case. Then, an electrolyte was injected to manufacture the lithium secondary battery Respectively. At this time, And 1% by weight of LiPF 6 and 2% by weight of VC (Vinylene Carbonate) in an organic solvent having a volume ratio of 1: 2: 1 of ethylene carbonate (EC): diethyl carbonate (DEC) Respectively.
  • VC Vinyl Carbonate
  • LFP LiFePO 4
  • LMO LiMnO 2
  • C1 to C2 Super-P: binder
  • the slurry composition prepared above was coated on a current collector (Al Foil, thickness 20 ⁇ ) and dried at 130 ⁇ for 12 hours to prepare respective positive electrodes.
  • a copper current collector was used for the anode current collector 21.
  • An electrode assembly is manufactured through a porous polyethylene separator between the anode and the anode current collector 21 manufactured in the above (1), and the electrode assemblies are placed in the case. Then, the following electrolytes A to C are respectively electrolytically mixed To prepare a lithium secondary battery.
  • DOL DME was prepared by dissolving 1 M of LiFSI and 2% by weight of LiNO 3 in an organic solvent having a volume ratio of 1: 1, using Electrolyte A as electrolyte B (EC) described in Example 1 of KR publication No. 2016-0138120 (PC, LiBF 4 1M, FEC 20%) described in Example 4 of KR publication No. 2016-0138120 was used as the electrolytic solution C, and the electrolytic solution C was used as the electrolytic solution B as the electrolytic solution B (DEC, 1: 1 vol.% LiBF 4 1M) Respectively.
  • a positive electrode was prepared in the same manner as in Example B-3. Specifically, LCO (LiCoO 2 ): Super-P: binder (PVdF) was mixed at a weight ratio of 95: 2.5: 2.5 to 30 ml of N-methyl-2-pyrrolidone, (LiMnO 2 ) was added so as to have a weight ratio of 30% to LCO. Then, each was mixed with a paste face mixer for 30 minutes to prepare a slurry composition.
  • LCO LiCoO 2
  • PVdF Super-P: binder
  • the slurry composition prepared above was coated on a current collector (Al Foil, thickness 20 ⁇ ) and dried at 130 ⁇ for 12 hours to prepare respective positive electrodes.
  • EO PEO
  • LiTFSI lithium bis (trifluoromethanesulfonyl) imide
  • the solution for forming a protective film was coated on a copper current collector and dried at 80 DEG C for 6 hours to form a protective film (thickness: 10 mu m) on the copper current collector.
  • An electrode assembly was fabricated between the anode prepared in (1) and the anode current collector 21 in (2) through a porous polyethylene separator. After the electrode assembly was positioned inside the case, Free battery. At this time, And 1% by weight of LiPF 6 and 2% by weight of VC (Vinylene Carbonate) in an organic solvent having a volume ratio of 1: 2: 1 of ethylene carbonate (EC): diethyl carbonate (DEC) Respectively.
  • Example 5 Preparation of anode-free battery with a LiPON protective film
  • a positive electrode was prepared in the same manner as in Example B-3. Specifically, LCO (LiCoO 2 ): Super-P: binder (PVdF) was mixed at a weight ratio of 95: 2.5: 2.5 to 30 ml of N-methyl-2-pyrrolidone, (LiMnO 2 ) was added so as to have a weight ratio of 30% to LCO. Then, each was mixed with a paste face mixer for 30 minutes to prepare a slurry composition.
  • LCO LiCoO 2
  • PVdF Super-P: binder
  • the slurry composition prepared above was coated on a current collector (Al Foil, thickness 20 ⁇ ) and dried at 130 ⁇ for 12 hours to prepare respective positive electrodes.
  • a coating layer was formed by sputtering for 25 minutes using a Li 3 PO 4 target in a vacuum chamber in an N 2 atmosphere. It was confirmed that the thickness of the surface coating layer was controlled according to the deposition time, and a protective film (thickness: 0.2 ⁇ ) was formed on the copper current collector. The thickness of the coating layer formed on the surface of the coating layer was confirmed using a scanning electron microscope.
  • An electrode assembly was fabricated between the anode prepared in (1) and the anode current collector 21 in (2) through a porous polyethylene separator. After the electrode assembly was positioned inside the case, Free battery. . At this time, And 1% by weight of LiPF 6 and 2% by weight of VC (Vinylene Carbonate) in an organic solvent having a volume ratio of 1: 2: 1 of ethylene carbonate (EC): diethyl carbonate (DEC) Respectively.
  • a negative electrode pre-battery having an ordinary positive electrode without the use of L2N was prepared.
  • LCO LiCoO 2
  • Super-P binder (PVdF) was mixed at a weight ratio of 95: 2.5: 2.5 to 30 ml of N-methyl-2-pyrrolidone, To prepare a slurry composition. The weight of the LCO added at this time was 15 g.
  • the slurry composition prepared above was coated on a current collector (Al Foil, thickness 20 ⁇ ) and dried at 130 ⁇ for 12 hours to prepare a positive electrode.
  • a copper current collector was used for the anode current collector 21.
  • a lithium secondary battery was prepared by preparing an electrode assembly between the positive electrode and the negative electrode prepared in the above (1) through a separator of porous polyethylene, placing the electrode assembly in the case, and injecting electrolyte. At this time, And 1% by weight of LiPF 6 and 2% by weight of VC (Vinylene Carbonate) in an organic solvent having a volume ratio of 1: 2: 1 of ethylene carbonate (EC): diethyl carbonate (DEC) Respectively.
  • LiPF 6 and VC Vinyl Carbonate
  • VC Vinyl Carbonate
  • LiFePO 4 was used as a positive electrode, and lithium secondary carbonate containing fluorine-containing organic compound fluoroethylene carbonate and inorganic salt sodium fluorofluoroborate borate A battery was produced.
  • LiFePO4, acetylene black and PVDF were mixed in a ratio of 90: 5: 5, and a positive electrode slurry was prepared using NMP as a solvent.
  • An anode current collector (rolled copper foil collector) was used.
  • L2N high irreversible anode additive
  • the negative electrode pre-battery prepared in A1 to A9 and Comparative Example 1 of Example 1 was charged.
  • / CV 5% current cut at 1C
  • discharge 0.1 C / C 3 V to prepare a lithium secondary battery having a lithium metal layer 23 formed thereon.
  • the capacity per unit area Li and the initial discharge capacity The initial discharge capacity expression ratio relative to the available capacity of the active material, the number of cycles at the time of reaching 80% of the initial capacity, and the number of cycles of the 50% remaining capacity of the initial discharge capacity.
  • the lithium metal layer 23 formed at this time was confirmed using a scanning electron microscope (JSM-7610F, JEOL).
  • the available capacity of LCO was 150 mAh / g
  • the available capacity of L2N was 110 mAh / g.
  • LMO high irreversible positive electrode additive
  • the negative electrode pre-battery prepared in B1 to B9 of Example 2 and Comparative Example 1 were charged into CC / CV (5% current cut at 1C) and discharge 0.1 C / C 3 V to prepare a lithium secondary battery having a lithium metal layer 23 formed thereon.
  • the capacity per unit area Li and the initial discharge capacity The initial discharge capacity expression ratio relative to the available capacity of the active material, the number of cycles at the time of reaching 80% of the initial capacity, and the number of cycles of the 50% remaining capacity of the initial discharge capacity.
  • the lithium metal layer 23 formed at this time was confirmed using a scanning electron microscope (JSM-7610F, JEOL). At this time, the available capacity of the LCO was 150 mAh / g, and the available capacity of the LMO was 100 mAh / g.
  • Example 2B-1 0.9 0.1 0.45 144.4 99.6 28 42
  • Example 2B-2 0.8 0.2 0.84 139.5 99.6 45
  • Example 2B-3 0.7 0.3 1.22 134.5 99.6 66
  • Example 2B-4 0.6 0.4 1.60 129.6 99.7 81 105
  • Example 2B-5 0.5 0.5 1.98 124.7 99.7 112 146
  • Example 2B-6 0.4 0.6 2.37 119.7 99.8 150 194
  • Example 2B-7 0.3 0.7 2.75 114.8 99.8 167 226
  • Example 2B-8 0.2 0.8 3.13 109.9 99.9 172 2
  • the negative electrode pre-battery prepared in C1 to C2 of Example 3 and Comparative Example 2 were charged 0.1 C, 4.25 (5% current cut at 1 C) and discharge 0.1 C / C 3 V to prepare a lithium secondary battery having a lithium metal layer 23,
  • the initial discharge capacity, the initial discharge capacity expression ratio relative to the available capacity of the active material, the number of cycles at the time of reaching 80% of the initial capacity, and the number of cycles of 50% of the initial discharge capacity were measured and recorded in Table 2 below.
  • the lithium metal layer 23 formed at this time was confirmed using a scanning electron microscope (JSM-7610F, JEOL). At this time, the usable capacity of LFP was calculated to be 150 mAh / g, and the usable capacity of LMO was calculated to be 100 mAh / g.
  • C-1 to C-2 represent the difference in the composition of the cathode active material mixture described in Example 3 above.
  • the negative electrode pre-charged cells prepared in Examples 2 to 4 and 1 were charged at 0.1 C, 4.25 V at 5% current cut at 1 C,
  • the number of cycles of the remaining capacity of 50% of the initial discharge capacity were measured and recorded in Table 2 below.
  • the lithium metal layer 23 formed at this time was confirmed using a scanning electron microscope (JSM-7610F, JEOL).
  • the available capacity of the LCO was 150 mAh / g
  • the available capacity of the LMO was 100 mAh / g.
  • * B-3 represents the mixed composition of the cathode active material described in Example 2 above.

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Abstract

La présente invention concerne une batterie secondaire au lithium qui est préparée en tant que batterie sans anode et qui a un métal lithium formé sur un collecteur de courant d'anode au moyen d'une charge. La batterie secondaire au lithium a un métal lithium formé sur le collecteur de courant d'anode tout en étant isolé de l'atmosphère. Par conséquent, un film d'oxyde de surface (couche native), qui est formé sur une anode existante, n'est pas sensiblement produit et, par conséquent, la dégradation en efficacité de batterie et des caractéristiques de durée de vie dues à ce fait peut être empêchée.
PCT/KR2018/007042 2017-06-21 2018-06-21 Batterie secondaire au lithium WO2018236168A1 (fr)

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EP18819917.8A EP3550638A4 (fr) 2017-06-21 2018-06-21 Batterie secondaire au lithium
JP2019549522A JP2020510292A (ja) 2017-06-21 2018-06-21 リチウム二次電池
CN201880020644.3A CN110476279B (zh) 2017-06-21 2018-06-21 锂二次电池
US16/474,303 US11322731B2 (en) 2017-06-21 2018-06-21 Lithium secondary battery

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KR10-2017-0078607 2017-06-21
KR10-2018-0070926 2018-06-20
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CN109728291A (zh) * 2018-12-29 2019-05-07 哈尔滨工业大学 一种高比能锂金属电池
CN109950528A (zh) * 2019-04-17 2019-06-28 天津瑞晟晖能科技有限公司 薄膜锂电池及其制备方法、正极薄膜材料、正极薄膜、正极组件及其制备方法、用电器
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CN113871725A (zh) * 2021-09-28 2021-12-31 洛阳储变电系统有限公司 一种无负极锂二次电池
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CN114335686A (zh) * 2021-12-29 2022-04-12 中南大学 一种基于双功能LiMnO2的无负极锂金属电池制备方法
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EP3605678A4 (fr) * 2017-12-27 2020-06-03 Lg Chem, Ltd. Batterie secondaire au lithium
US11283064B2 (en) 2017-12-27 2022-03-22 Lg Energy Solution, Ltd. Lithium secondary battery
CN109728291A (zh) * 2018-12-29 2019-05-07 哈尔滨工业大学 一种高比能锂金属电池
CN109950528A (zh) * 2019-04-17 2019-06-28 天津瑞晟晖能科技有限公司 薄膜锂电池及其制备方法、正极薄膜材料、正极薄膜、正极组件及其制备方法、用电器
CN115443554A (zh) * 2021-03-26 2022-12-06 株式会社Lg新能源 锂二次电池的正极和锂二次电池
CN113871725A (zh) * 2021-09-28 2021-12-31 洛阳储变电系统有限公司 一种无负极锂二次电池
CN114335686A (zh) * 2021-12-29 2022-04-12 中南大学 一种基于双功能LiMnO2的无负极锂金属电池制备方法

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