Lithium titanate battery cell capable of inhibiting flatulence and preparation method thereof

A technology of lithium titanate and negative electrode lithium titanate is applied in the field of lithium titanate battery cells that suppress flatulence and its preparation, and can solve problems such as battery performance impact, so as to reduce the risk of gas production, avoid direct contact reactions, and reduce flatulence problems. Effect

Pending Publication Date: 2020-05-08
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a lithium titanate battery cell and its preparation method for suppressing flatulence, so as to solve the problem of battery flatulence affecting battery performance in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The Lot2 batch of materials is prepared according to the cell preparation method in the summary of the invention, and the steps are as follows:

[0031] (1) After lithium titanate is baked at 120°C for 12 hours, it is mixed with SP, CNT, PVDF, Gr, Li 2 CO 3 Mix the slurry, and obtain the lithium titanate pole piece after coating and rolling;

[0032] (2) Spray Al on the surface of the lithium titanate pole piece 2 o 3 The slurry is sprayed with a thickness of 0.5um, and after drying, a negative electrode lithium titanate pole piece with an insulating layer is obtained;

[0033] (3) The negative lithium titanate pole piece obtained in step (2) is wound / stacked, assembled, welded / packaged with the positive pole piece and the diaphragm after being slit, and the lithium titanate battery cell is obtained;

[0034] (4) Lithium titanate cells were vacuum-baked at 90°C for 48 hours, followed by primary liquid injection (the liquid injection volume was 80% of the total liqui...

Embodiment 2

[0036] The Lot2 batch of materials is prepared according to the cell preparation method in the summary of the invention, and the steps are as follows:

[0037] (1) After lithium titanate is baked at 120°C for 12 hours, it is mixed with SP, CNT, PVDF, Gr, Li 2 CO 3 Mix the slurry, and obtain the lithium titanate pole piece after coating and rolling;

[0038] (2) spray calcium phosphate slurry on the surface of the lithium titanate pole piece, the spraying thickness is 0.5um, obtain the negative electrode lithium titanate pole piece with insulating layer after drying;

[0039] (3) The negative lithium titanate pole piece obtained in step (2) is wound / stacked, assembled, welded / packaged with the positive pole piece and the diaphragm after being slit, and the lithium titanate battery cell is obtained;

[0040] (4) Lithium titanate cells were vacuum-baked at 90°C for 48 hours, followed by primary liquid injection (the liquid injection volume was 80% of the total liquid injection ...

Embodiment 3

[0042]The Lot2 batch of materials was prepared according to the cell preparation method in the content of the invention, and the steps were as follows: (1) Lithium titanate was baked at 120°C for 12 hours, and mixed with SP, CNT, PVDF, Gr, Li 2 CO 3 Mix the slurry, and obtain the lithium titanate pole piece after coating and rolling;

[0043] (2) spray calcium phosphate slurry on the surface of the lithium titanate pole piece, the spraying thickness is 1.0um, and obtain the negative electrode lithium titanate pole piece with insulating layer after drying;

[0044] (3) The negative lithium titanate pole piece obtained in step (2) is wound / stacked, assembled, welded / packaged with the positive pole piece and the diaphragm after being slit, and the lithium titanate battery cell is obtained;

[0045] (4) Lithium titanate cells were vacuum-baked at 90°C for 48 hours, followed by primary liquid injection (the liquid injection volume was 80% of the total liquid injection volume), for...

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PUM

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Abstract

The invention discloses a lithium titanate battery cell capable of inhibiting flatulence and a preparation method thereof. The preparation method comprises the steps that mixing lithium titanate, a conductive agent, a binder and an additive capable of inhibiting flatulence into slurry to prepare a lithium titanate pole piece; carrying out spraying treatment on the lithium titanate pole piece, spraying an insulating layer on the surface of the lithium titanate pole piece, slitting, and carrying out winding/laminating and other processes on the slit lithium titanate pole piece, a positive plateand a diaphragm to prepare a lithium titanate battery cell; and carrying out the procedures of liquid injection, formation, aging and the like on the lithium titanate battery cell to obtain the lithium titanate battery cell. According to the invention, the additive for inhibiting flatulence is introduced into the raw material components of the lithium titanate pole piece, so that the formation ofa compact SEI film is promoted on the surface of the lithium titanate material, and battery flatulence is reduced; and the insulating layer is sprayed on the surface of the lithium titanate pole pieceto isolate the lithium titanate material from an electrolyte, so that direct contact reaction is avoided, and the risk of gas production is reduced. In addition, the formation and aging processes areimproved, the moisture in the environment is strictly controlled, and the lithium titanate battery cell with excellent performance is prepared.

Description

technical field [0001] The invention belongs to the technical field of lithium titanate electric cores, in particular to a lithium titanate electric core capable of suppressing flatulence and a preparation method thereof. Background technique [0002] Lithium titanate material can be used as the negative electrode material of the battery. Lithium titanate battery can achieve a cycle life of tens of thousands of cycles and a rate charge and discharge performance higher than 30C, and has excellent safety performance. It is comparable in terms of cycle, rate and safety. Compared with traditional graphite anode materials, it has huge advantages; however, lithium titanate batteries face the problem of battery flatulence during the commercialization process, and battery flatulence will cause bubbles between the positive and negative electrodes inside the battery, causing + Migration is difficult, and dead lithium areas appear, resulting in reduced capacity and worsened cycle perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M10/0525H01M10/058H01M10/44
CPCH01M4/1391H01M4/131H01M10/0525H01M10/058H01M10/446H01M2004/027Y02E60/10Y02P70/50
Inventor 刘宏强安敏俊周巨奎
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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