Preparation method for lithium titanate lithium ion battery

A lithium ion battery, lithium titanate technology, applied in the field of electrochemistry, can solve the problem of lithium titanate being prone to gas swelling, and achieve the effects of improving wettability, improving fast charge-discharging performance and cycle performance, and inhibiting gas swelling.

Active Publication Date: 2014-02-19
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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  • Preparation method for lithium titanate lithium ion battery
  • Preparation method for lithium titanate lithium ion battery
  • Preparation method for lithium titanate lithium ion battery

Examples

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Effect test

Embodiment 1

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

[0038] Preparation of negative electrode sheet: Lithium titanate (Li 4 Ti 5 o 12 ) is the negative electrode active material, and the binder polyvinylidene fluoride (PVDF), conductive carbon black (Super-P), additive phosphorus flake graphite in a mass ratio of 90:4:5:1, and N,N-dimethyl Pyrrolidone (NMP) was mixed and prepared into negative electrode slurry, and the current collector ...

Embodiment 2

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

[0049] Preparation of negative electrode sheet: Lithium titanate (Li 4 Ti 5 o 12 ) is the negative electrode active material, and the binder polyvinylidene fluoride (PVDF), conductive carbon black (Super-P), additive phosphorus flake graphite in a mass ratio of 90:5:3:2, and N,N-dimethyl Pyrrolidone (NMP) was mixed and prepared into negative electrode slurry, and the current collector was aluminum foil, which was coa...

Embodiment 3

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

[0060] Preparation of negative electrode sheet: Lithium titanate (Li 4 Ti 5 o 12 ) is the negative electrode active material, and the binder polyvinylidene fluoride (PVDF), conductive carbon black (Super-P), additive phosphorus flake graphite in a mass ratio of 90:5:3:2, and N,N-dimethyl Pyrrolidone (NMP) was mixed and prepared into negative electrode slurry, and the current collector was aluminum foil, which was coated accordi...

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Abstract

The invention discloses a preparation method for a lithium titanate lithium ion battery. A cathode active substance in a cathode diaphragm of the battery is lithium titanate. During liquid injection, an electrolyte containing ionic liquid and a functional additive is injected for the first time, primary pre-charging and activation are carried out, a commercial lithium ion battery electrolyte is injected for the second time, then secondary activation is carried out, and high temperature charge-discharge cycles and air extracting sealing are carried out so as to obtain the lithium ion battery. According to the invention, activation is carried out twice, the objective of secondary activation is to further reinforce the properties of a solid electrolyte interphase (SEI) film formed at the first time, so formation of a stable and compact SEI film on the surface of a cathode is facilitated, generation of gas in the processes of charging and discharging of the lithium titanate lithium ion battery can be effectively inhibited, and the cycle life and rapid charging and discharging performance of the battery are improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery using lithium titanate as a negative electrode active material, belonging to the field of electrochemistry. Background technique [0002] Lithium-ion secondary battery, as a green 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 widely used in mobile devices such as motorcycles and electric vehicles. With the rapid development of large-scale energy storage and power equipment such as hybrid electric vehicles, pure electric vehicles, base station energy storage, and grid energy storage, the scope of application is also expanding, and the battery cell capacity is getting higher and higher. The safety performance of the secondary battery puts forward higher requirements. [0003] At present, commercial lithium-ion batteries mainly use graphite-based negative electrode materials. LiC 6 ...

Claims

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Application Information

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