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Battery shell, preparation method hereof, lithium ion battery and lithium supplementing method thereof

A lithium-ion battery and battery shell technology, which is applied in the manufacture of electrolyte batteries, charging/discharging of secondary batteries, secondary batteries, etc., can solve the problems of electrolyte performance impact, inaccurate lithium supplementation, and battery safety without any help , to achieve the effect of improving operational safety, improving cycle performance and energy density, and improving operational safety

Active Publication Date: 2019-10-25
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is cumbersome, may affect the performance of the electrolyte, and does not contribute to improving battery safety
[0008] However, the above lithium supplementation methods all have imprecise lithium supplementation, or do not help to improve battery safety.

Method used

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  • Battery shell, preparation method hereof, lithium ion battery and lithium supplementing method thereof

Examples

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Effect test

Embodiment 1

[0067] The present embodiment provides a battery case, which includes a case, a lithium-replenishing layer on the inner surface of the case, and a protective layer on the lithium-replenishing layer.

[0068] The shell is an aluminum shell with a thickness of 0.7 mm.

[0069] The lithium replenishing layer is composed of lithium powder, acetylene black and polyvinylidene fluoride, wherein the mass ratio of lithium powder, acetylene black and polyvinylidene fluoride is 90:5:5. The thickness of the lithium-supplementing layer is 100 μm.

[0070] The protective layer is a high molecular polymer protective layer, and the high molecular polymer is polystyrene. The thickness of the protective layer is 8 μm.

[0071] This embodiment also provides a method for preparing the battery case, the specific method is:

[0072] Under a nitrogen atmosphere, mix lithium powder, acetylene black and polyvinylidene fluoride in N-methylpyrrolidone to obtain a lithium-containing slurry, coat the l...

Embodiment 2

[0080] The present embodiment provides a battery case, which includes a case, a lithium-replenishing layer on the inner surface of the case, and a protective layer on the lithium-replenishing layer.

[0081] The shell is an aluminum shell with a thickness of 1 mm.

[0082] The lithium replenishing layer is composed of lithium powder, acetylene black and polyvinylidene fluoride, wherein the mass ratio of lithium powder, acetylene black and polyvinylidene fluoride is 88:6:6. The thickness of the lithium-supplementing layer is 200 μm.

[0083] The protective layer is a high molecular polymer protective layer, and the high molecular polymer is polyvinyl chloride. The thickness of the protective layer is 10 μm.

[0084] This embodiment also provides a method for preparing the battery case, the specific method is:

[0085] Under a nitrogen atmosphere, mix lithium powder, acetylene black and polyvinylidene fluoride in N-methylpyrrolidone to obtain a lithium-containing slurry, coat...

Embodiment 3

[0093] The present embodiment provides a battery case, which includes a case, a lithium-replenishing layer on the inner surface of the case, and a protective layer on the lithium-replenishing layer.

[0094] The shell is an aluminum shell with a thickness of 0.5 mm.

[0095] The lithium supplement layer is composed of lithium powder, Ketjen black and styrene-butadiene rubber, wherein the mass ratio of lithium powder, Ketjen black and styrene-butadiene rubber is 92:4:4. The thickness of the lithium-supplementing layer is 10 μm.

[0096] The protective layer is a high molecular polymer protective layer, and the high molecular polymer is polyethylene-polyvinyl acetate copolymer. The thickness of the protective layer is 5 μm.

[0097] This embodiment also provides a method for preparing the battery case, the specific method is:

[0098] Under a nitrogen atmosphere, mix lithium powder, ketjen black, and styrene-butadiene rubber in a formula amount in methyl ethyl ketone to obtai...

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Abstract

The invention provides a battery shell, a preparation method thereof, a lithium ion battery and a lithium supplementing method thereof. The battery shell comprises a shell body, a lithium supplementing layer positioned on the inner surface of the shell body and a protective layer positioned on the lithium supplementing layer. The method comprises the steps of 1) preparing lithium-containing slurry, and coating the lithium-containing slurry on the inner surface of the shell body to obtain a lithium supplementing layer; and 2) coating the protective layer raw material slurry on the lithium supplementing layer to prepare a protective layer, and obtaining the battery shell. The battery shell provided by the invention has a lithium supplementing function, and can realize accurate lithium supplementation through accurately controlling the thickness of the lithium supplementing layer; and the protective layer on the lithium supplementing layer can plays a role of packaging so as to prevent the lithium supplementing layer from oxidized, the third electrode can be cancelled when the battery shell is used for preparing the lithium ion battery, the safety is improved, and the energy density of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a battery case and a preparation method thereof, a lithium ion battery and a lithium replenishment method thereof. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Lithium-ion batteries pursue high energy density, and increasing capacity is one of the ways to increase energy density. [0003] The first coulombic efficiency of the positive and negative electrode materials of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M10/0525H01M10/058H01M10/42H01M10/44
CPCH01M10/0525H01M10/058H01M10/4235H01M10/446H01M50/116H01M50/124Y02E60/10Y02P70/50
Inventor 宋贺黄天翔华秉杨林沃荣梁正峰
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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