CN110649322A - Method for manufacturing high-specific-energy lithium ion battery - Google Patents

Method for manufacturing high-specific-energy lithium ion battery Download PDF

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Publication number
CN110649322A
CN110649322A CN201910835059.5A CN201910835059A CN110649322A CN 110649322 A CN110649322 A CN 110649322A CN 201910835059 A CN201910835059 A CN 201910835059A CN 110649322 A CN110649322 A CN 110649322A
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lithium
battery
preparing
silicon
lithium salt
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杜洪彦
宁宏军
赵海刚
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Henan Henan Qingxin Energy Industry Co Ltd
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Henan Henan Qingxin Energy Industry Co Ltd
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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
    • H01M10/058—Construction or manufacture
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0568—Liquid materials characterised by the solutes
    • 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
    • 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
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
    • 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
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/386—Silicon or alloys based on silicon
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/523—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron for non-aqueous cells
    • 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
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
    • 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
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • 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
    • 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

Abstract

The invention discloses a manufacturing method of a high-specific energy lithium ion battery, which comprises the following steps: the method comprises the steps of preparing a battery anode, preparing a battery cathode, preparing electrolyte and preparing the battery, wherein a high-voltage lithium cobaltate (LiCoO2) is used as an anode material, the charging voltage of the material is more than 4.35V, and the material is convenient to charge quickly, a silicon-based material is used as a cathode material, and one or more of Vinylene Carbonate (VC), fluoroethylene carbonate (FEC), lithium difluorophosphate (LiPO2F2) and 1-fluoro-silane are added into the electrolyte, so that the energy density of the power lithium battery is remarkably improved, and the cycle life is prolonged.

Description

Method for manufacturing high-specific-energy lithium ion battery
Technical Field
The invention relates to the field of battery manufacturing, in particular to a manufacturing method of a high-specific-energy lithium ion battery.
Background
With the development of electric vehicles, the bottleneck of the electric vehicles is the performance of the battery, the problem of poor cruising ability caused by poor performance of the battery used at present generally exists, and the service life of the battery is short, so that the use cost of the electric vehicles of consumers is high.
For example, CN201010104506.9 is a method for manufacturing a lithium ion battery, comprising the following steps: firstly, removing an oxide layer on the surface of a positive electrode current collector of the lithium ion battery by using corrosive liquid; coating a layer of conductive film on the surface of the positive current collector of the lithium ion battery; thirdly, manufacturing a positive pole piece of the lithium ion battery on the basis of the materials; and fourthly, matching the positive electrode of the lithium ion battery with a corresponding negative plate and winding the positive electrode into a pole group, and filling electrolyte and sealing after the pole group is arranged in the battery shell.
Above-mentioned patent product can't promote battery performance, and to this kind of condition, this patent aims at providing a high specific energy lithium ion battery's manufacturing method, can show the energy density who improves power lithium cell, improves the duration of a journey ability of battery, prolongs the cycle life of battery simultaneously.
Disclosure of Invention
A method for manufacturing a high specific energy lithium ion battery comprises the following steps:
(1) preparing a battery anode: taking high-voltage lithium cobaltate (LiCoO2) as positive electrode slurry, and extruding and coating the positive electrode slurry on the surface of a positive electrode material to form a battery positive electrode;
(2) preparing a battery cathode: taking a silicon-based material as negative electrode slurry, extruding and coating the silicon-based material on the surface of a negative electrode material to form a battery negative electrode, wherein the silicon-based material comprises carbon-coated nano silicon (nano-Si @ C), a silicon monoxide carbon composite material (SiO @ C), a silicon nanowire (Si nanowire/SS), a variable oxygen type silicon monoxide carbon composite material (SiOx @ C) and an amorphous silicon alloy (amorphus SiM);
(3) preparing an electrolyte: adding one or more of Vinylene Carbonate (VC), fluoroethylene carbonate (FEC), lithium difluorophosphate (LiPO2F2) and 1-fluorosilane into electrolyte lithium salt to prepare a mixed lithium salt solution;
(4) preparing a battery: assembling the battery anode and the battery prepared in the steps (1) and (2) into an aluminum-plastic packaging shell, injecting the electrolyte prepared in the step (3) into the aluminum-plastic packaging shell, and sealing the aluminum-plastic packaging shell to obtain the novel lithium ion battery.
Preferably, the positive electrode material in the step (1) is a carbon-coated aluminum foil.
Preferably, the negative electrode material in the step (2) is a microporous aluminum foil.
Preferably, the electrolyte lithium salt composition of step (3) includes a primary lithium salt and a secondary lithium salt.
Preferably, the primary lithium salt is lithium hexafluorophosphate.
Preferably, the secondary lithium salt is any one or more of lithium tetrafluoroborate, lithium bis (oxalato) borate and lithium bis (fluorosulfonyl) imide.
Preferably, the secondary lithium salt is lithium tetrafluoroborate, lithium bis (oxalato) borate, lithium bis (fluorosulfonyl) imide.
Has the advantages that: the invention provides a manufacturing method of a high-specific energy lithium ion battery, which comprises the following steps: preparing a battery anode, preparing a battery cathode, preparing electrolyte and preparing the battery, wherein the anode material uses high-voltage lithium cobaltate (LiCoO2), the charging voltage of the material is more than 4.35V, and the material is convenient to charge quickly, the cathode material uses a silicon-based material, one or more of Vinylene Carbonate (VC), fluoroethylene carbonate (FEC), lithium difluorophosphate (LiPO2F2) and 1-fluoro-silane are added into the electrolyte, so that the energy density of the power lithium battery is obviously improved, the cycle life is prolonged, the anode material in the step (1) is a carbon-coated aluminum foil which can be used as a reliable conductive carrier and can effectively improve the energy density after being coated with a film material, the cathode material in the step (2) is a microporous aluminum foil which can effectively embed the silicon-based material into the cathode material, the material is prevented from falling off, the electrolyte lithium salt component in the step (3) comprises a main lithium salt and a secondary lithium salt, the defect of a single lithium salt can be overcome by mixing multiple electrolyte lithium salts, the service life of the battery is effectively prolonged, the main lithium salt is lithium hexafluorophosphate, the main lithium salt is a battery lithium salt mainly used at present, so the source is wide, the manufacturing cost of the battery can be saved, the secondary lithium salt is any one or more of lithium tetrafluoroborate, lithium bis (oxalato) borate and lithium bis (fluorosulfonylimide), the secondary lithium salt can supplement and overcome the disadvantages of the lithium hexafluorophosphate, the performance of the electrolyte is more stable, the service life of the electrolyte is effectively prolonged, and the performance of the battery is improved.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1:
a method for manufacturing a high specific energy lithium ion battery comprises the following steps:
(1) preparing a battery anode: high-voltage lithium cobaltate (LiCoO2) is used as anode slurry, and is extruded and coated on the surface of the carbon-coated aluminum foil of the anode material to form the anode of the battery;
(2) preparing a battery cathode: taking a silicon-based material as negative electrode slurry, extruding and coating the silicon-based material on the surface of a microporous aluminum foil of a negative electrode material to form a battery negative electrode, wherein the silicon-based material comprises carbon-coated nano silicon (nano-Si @ C), a silicon monoxide carbon composite material (SiO @ C), a silicon nanowire (Si nanowire/SS), a variable oxygen type silicon monoxide carbon composite material (SiOx @ C) and an amorphous silicon alloy (amorphus Sim);
(3) preparing an electrolyte: adding Vinylene Carbonate (VC) and 1-fluorosilane into electrolyte lithium salt, wherein the electrolyte lithium salt comprises main lithium salt and secondary lithium salt, the main lithium salt is lithium hexafluorophosphate, and the secondary lithium salt is lithium tetrafluoroborate, lithium bis (oxalato) borate and lithium bis (fluorosulfonyl) imide to prepare a mixed lithium salt solution;
(4) preparing a battery: assembling the battery anode and the battery prepared in the steps (1) and (2) into an aluminum-plastic packaging shell, injecting the electrolyte prepared in the step (3) into the aluminum-plastic packaging shell, and sealing the aluminum-plastic packaging shell to obtain the novel lithium ion battery.
Example 2:
a method for manufacturing a high specific energy lithium ion battery comprises the following steps:
(1) preparing a battery anode: high-voltage lithium cobaltate (LiCoO2) is used as anode slurry, and is extruded and coated on the surface of the carbon-coated aluminum foil of the anode material to form the anode of the battery;
(2) preparing a battery cathode: taking a silicon-based material as negative electrode slurry, extruding and coating the silicon-based material on the surface of a microporous aluminum foil of a negative electrode material to form a battery negative electrode, wherein the silicon-based material comprises carbon-coated nano silicon (nano-Si @ C), a silicon monoxide carbon composite material (SiO @ C), a silicon nanowire (Si nanowire/SS), a variable oxygen type silicon monoxide carbon composite material (SiOx @ C) and an amorphous silicon alloy (amorphus Sim);
(3) preparing an electrolyte: adding Vinylene Carbonate (VC), fluoroethylene carbonate (FEC), lithium difluorophosphate (LiPO2F2) and 1-fluorosilane into electrolyte lithium salt, wherein the electrolyte lithium salt comprises a main lithium salt and a secondary lithium salt, the main lithium salt is lithium hexafluorophosphate, the secondary lithium salt is lithium tetrafluoroborate, lithium bis (oxalato) borate and lithium bis (fluorosulfonyl) imide, and preparing a mixed lithium salt solution;
(4) preparing a battery: assembling the battery anode and the battery prepared in the steps (1) and (2) into an aluminum-plastic packaging shell, injecting the electrolyte prepared in the step (3) into the aluminum-plastic packaging shell, and sealing the aluminum-plastic packaging shell to obtain the novel lithium ion battery.
Example 3:
a method for manufacturing a high specific energy lithium ion battery comprises the following steps:
(1) preparing a battery anode: high-voltage lithium cobaltate (LiCoO2) is used as anode slurry, and is extruded and coated on the surface of the carbon-coated aluminum foil of the anode material to form the anode of the battery;
(2) preparing a battery cathode: taking a silicon-based material as negative electrode slurry, extruding and coating the silicon-based material on the surface of a microporous aluminum foil of a negative electrode material to form a battery negative electrode, wherein the silicon-based material comprises carbon-coated nano silicon (nano-Si @ C), a silicon monoxide carbon composite material (SiO @ C), a silicon nanowire (Si nanowire/SS), a variable oxygen type silicon monoxide carbon composite material (SiOx @ C) and an amorphous silicon alloy (amorphus Sim);
(3) preparing an electrolyte: adding fluoroethylene carbonate (FEC), lithium difluorophosphate (LiPO2F2) and 1-fluorosilane into electrolyte lithium salt, wherein the electrolyte lithium salt comprises a main lithium salt and a secondary lithium salt, the main lithium salt is lithium hexafluorophosphate, and the secondary lithium salt is lithium tetrafluoroborate, lithium bisoxalato borate and lithium bisfluorosulfonylimide to prepare a mixed lithium salt solution;
(4) preparing a battery: assembling the battery anode and the battery prepared in the steps (1) and (2) into an aluminum-plastic packaging shell, injecting the electrolyte prepared in the step (3) into the aluminum-plastic packaging shell, and sealing the aluminum-plastic packaging shell to obtain the novel lithium ion battery.
The cells prepared in each example were extracted for analysis and compared to the prior art to yield the following data:
Figure BDA0002189322940000051
Figure BDA0002189322940000061
according to the data in the table, when the parameters of the embodiment 2 are used, the process parameters of the manufacturing method of the high specific energy lithium ion battery are 159Wh/kg in energy density, 5 years in service life, 400 times in recycling and 1.5h in charging time, while the prior art standards are 150Wh/kg in energy density, 4 years in service life, 300 times in recycling and 2h in charging time.
The invention provides a manufacturing method of a high-specific energy lithium ion battery, which comprises the following steps: preparing a battery anode, preparing a battery cathode, preparing electrolyte and preparing the battery, wherein the anode material uses high-voltage lithium cobaltate (LiCoO2), the charging voltage of the material is more than 4.35V, and the material is convenient to charge quickly, the cathode material uses a silicon-based material, one or more of Vinylene Carbonate (VC), fluoroethylene carbonate (FEC), lithium difluorophosphate (LiPO2F2) and 1-fluoro-silane are added into the electrolyte, so that the energy density of the power lithium battery is obviously improved, the cycle life is prolonged, the anode material in the step (1) is a carbon-coated aluminum foil which can be used as a reliable conductive carrier and can effectively improve the energy density after being coated with a film material, the cathode material in the step (2) is a microporous aluminum foil which can effectively embed the silicon-based material into the cathode material, the material is prevented from falling off, the electrolyte lithium salt component in the step (3) comprises a main lithium salt and a secondary lithium salt, the defect of a single lithium salt can be overcome by mixing various electrolyte lithium salts, the service life of the battery is effectively prolonged, the main lithium salt is lithium hexafluorophosphate, the main lithium salt is a battery lithium salt mainly used at present, so the source is wide, the manufacturing cost of the battery can be saved, the secondary lithium salt is any one or more of lithium tetrafluoroborate, lithium bis (oxalato) borate and lithium bis (fluorosulfonylimide), the secondary lithium salt is lithium tetrafluoroborate, lithium bis (oxalato) borate and lithium bis (oxalato) borate, the secondary lithium salt can supplement and overcome the disadvantage of lithium hexafluorophosphate, the performance of the electrolyte is more stable, the service life of the electrolyte is effectively prolonged, and the performance of the battery is improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims (7)

1. A method of manufacturing a high specific energy lithium ion battery, the method steps comprising:
(1) preparing a battery anode: taking high-voltage lithium cobaltate (LiCoO2) as positive electrode slurry, and extruding and coating the positive electrode slurry on the surface of a positive electrode material to form a battery positive electrode;
(2) preparing a battery cathode: taking a silicon-based material as negative electrode slurry, extruding and coating the silicon-based material on the surface of a negative electrode material to form a battery negative electrode, wherein the silicon-based material comprises carbon-coated nano silicon (nano-Si @ C), a silicon monoxide carbon composite material (SiO @ C), a silicon nanowire (Si nanowire/SS), a variable oxygen type silicon monoxide carbon composite material (SiOx @ C) and an amorphous silicon alloy (amorphusSiM);
(3) preparing an electrolyte: adding one or more of Vinylene Carbonate (VC), fluoroethylene carbonate (FEC), lithium difluorophosphate (LiPO2F2) and 1-fluorosilane into electrolyte lithium salt to prepare a mixed lithium salt solution;
(4) preparing a battery: assembling the battery anode and the battery prepared in the steps (1) and (2) into an aluminum-plastic packaging shell, injecting the electrolyte prepared in the step (3) into the aluminum-plastic packaging shell, and sealing the aluminum-plastic packaging shell to obtain the novel lithium ion battery.
2. The method according to claim 1, wherein the positive electrode material in step (1) is a carbon-coated aluminum foil.
3. The method according to claim 1, wherein the negative electrode material in step (2) is microporous aluminum foil.
4. The method of claim 1, wherein the step (3) of preparing the electrolyte lithium salt composition includes a primary lithium salt and a secondary lithium salt.
5. The method of claim 4, wherein the primary lithium salt is lithium hexafluorophosphate.
6. The method of claim 4, wherein the secondary lithium salt is any one or more of lithium tetrafluoroborate, lithium bis (oxalato) borate, and lithium bis (fluorosulfonyl) imide.
7. The method of claim 6, wherein the secondary lithium salt is lithium tetrafluoroborate, lithium bis oxalato borate, lithium bis fluorosulfonylimide.
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