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A kind of preparation method of lithium titanate lithium ion battery

A lithium-ion battery and lithium titanate technology, which is applied in the field of electrochemistry, can solve the problems of lithium titanate being easy to inflate, etc., and achieve the effects of improving wetting performance, suppressing gas generation, and improving electrochemical performance

Active Publication Date: 2015-11-25
HUNAN GAOYUAN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a preparation method of lithium titanate lithium ion battery, by adding electrolyte solutions with different components in different process stages, and adopting two activations, degassing after multiple charges and discharges under high temperature conditions Sealing and other methods to solve the problem of easy inflation of lithium titanate

Method used

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  • A kind of preparation method of lithium titanate lithium ion battery
  • A kind of preparation method of lithium titanate lithium ion battery
  • A kind of preparation method of lithium titanate lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Preparation of the positive electrode plate: Lithium nickel cobalt manganese oxide (LiCo 1 / 3 Ni 1 / 3 Mn 1 / 3 O 2 ), conductive carbon black (Super-P), and polyvinylidene fluoride (PVDF) are mixed with N,N-dimethylpyrrolidone (NMP) in a certain proportion, and stirred uniformly to obtain a slurry for coating the positive electrode sheet. Then, the slurry is uniformly coated on the positive electrode current collector (aluminum foil) in a certain width, and the positive electrode sheet is prepared by cold pressing and slicing (that is, the positive electrode sheet is cut and cut to the required size).

[0038] The preparation of the negative electrode: Lithium titanate (Li 4 Ti 5 O 12 ) Is the negative electrode active material, with the binder polyvinylidene fluoride (PVDF), conductive carbon black (Super-P), and the additive phosphor flake graphite in a mass ratio of 90:4:5:1, and N,N-dimethyl NMP and the like are mixed to prepare a negative electrode slurry, and the current ...

Embodiment 2

[0048] Preparation of the positive electrode plate: Lithium manganate (Li 2 MnO 4 ), conductive carbon black (Super-P), and polyvinylidene fluoride (PVDF) are mixed with N,N-dimethylpyrrolidone (NMP) in a certain proportion, and stirred uniformly to obtain a slurry for coating the positive electrode sheet. Then, the slurry is uniformly coated on the positive electrode current collector (aluminum foil) in a certain width, and the positive electrode sheet is prepared by cold pressing and slicing (that is, the positive electrode sheet is cut and cut to the required size).

[0049] The preparation of the negative electrode: Lithium titanate (Li 4 Ti 5 O 12 ) Is the negative electrode active material, with the binder polyvinylidene fluoride (PVDF), conductive carbon black (Super-P), additive phosphor flake graphite in a mass ratio of 90:5:3:2, and N,N-dimethyl NMP and the like are mixed to prepare a negative electrode slurry, and the current collector is aluminum foil, which is coated ...

Embodiment 3

[0059] The preparation of the positive electrode plate: Lithium cobalt oxide (LiCoO 2 ), conductive carbon black (Super-P), and polyvinylidene fluoride (PVDF) are mixed with N,N-dimethylpyrrolidone (NMP) in a certain proportion, and stirred uniformly to obtain a slurry for coating the positive electrode sheet. Then, the slurry is uniformly coated on the positive electrode current collector (aluminum foil) in a certain width, and the positive electrode sheet is prepared by cold pressing and slicing (that is, the positive electrode sheet is cut and cut to the required size).

[0060] The preparation of the negative electrode: Lithium titanate (Li 4 Ti 5 O 12 ) Is the negative electrode active material, with the binder polyvinylidene fluoride (PVDF), conductive carbon black (Super-P), additive phosphor flake graphite in a mass ratio of 90:5:3:2, and N,N-dimethyl NMP and the like are mixed to prepare a negative electrode slurry, and the current collector is aluminum foil, which is coa...

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Abstract

The invention discloses a preparation method of a lithium titanate lithium ion battery. The negative electrode active material in the negative electrode diaphragm of the battery is lithium titanate. During the liquid injection, the electrolyte solution containing ionic liquid and functional additives is injected for the first time, and the first pre-charge activation is performed, and the commercial lithium-ion battery electrolyte is injected for the second time, and the second activation is performed, and it is charged and discharged at high temperature After the cycle, a pumping and sealing step is performed to obtain a lithium ion battery. The present invention uses two activations. The purpose of the second activation is to further strengthen the properties of the solid electrolyte film (SEI) formed for the first time, so as to facilitate the formation of a stable and dense SEI film on the surface of the negative electrode, which can effectively inhibit the lithium titanate lithium ion battery. Generate gas during charging and discharging, and significantly improve the cycle life and fast charging and discharging performance of the battery.

Description

Technical field [0001] The invention relates to a method for preparing a lithium ion battery using lithium titanate as a negative electrode active material, and belongs to the field of electrochemistry. Background technique [0002] Lithium-ion secondary battery, as a kind of green environmental protection battery, has the advantages of high working voltage, high specific energy and long cycle life. It has been developed rapidly in recent years. It is used in notebook computers, digital cameras, mobile phones, MP3, MP4, electric bicycles, electric bicycles, etc. The applications in mobile devices such as motorcycles and electric cars are becoming more and more widespread. With the rapid development of large-scale energy storage and power equipment such as hybrid electric vehicles, pure electric vehicles, base station energy storage, grid energy storage, etc., the scope of application is also expanding, and the single capacity of batteries is getting higher and higher. The safety...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M10/0567H01M10/058H01M10/4242Y02E60/10Y02P70/50
Inventor 唐杰雄李阳春
Owner HUNAN GAOYUAN BATTERY