A kind of battery case and preparation method thereof, lithium ion battery and lithium replenishment method thereof

A lithium-ion battery and battery case technology, which is used in the manufacture of electrolyte batteries, charging/discharging of secondary batteries, secondary batteries, etc., can solve the problems of no help in battery safety, influence of electrolyte performance, and inaccurate lithium replenishment. , to achieve the effect of improving operation safety, improving cycle performance and energy density, and simple operation

Active Publication Date: 2022-05-27
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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  • A kind of battery case and preparation method thereof, lithium ion battery and lithium replenishment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] This embodiment provides a battery case, the battery case 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, and its thickness is 0.7mm.

[0069] The lithium supplement 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 supplementary 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 preparation method of the battery case, and the specific method is as follows:

[0072] Under a nitrogen atmosphere, the formula amounts of lithium powder, acetylene black and polyvinylidene fluoride are mixed in N-methylpyrrolidone t...

Embodiment 2

[0080] This embodiment provides a battery case, the battery case 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, and its thickness is 1 mm.

[0082] The lithium supplementing 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 supplementary 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 preparation method of the battery case, and the specific method is as follows:

[0085] Under a nitrogen atmosphere, the formula amounts of lithium powder, acetylene black and polyvinylidene fluoride are mixed in N-methylpyr...

Embodiment 3

[0093] This embodiment provides a battery case, the battery case 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, and its thickness is 0.5mm.

[0095] The lithium replenishing 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 supplementary layer is 10 μm.

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

[0097] This embodiment also provides a preparation method of the battery case, and the specific method is as follows:

[0098] Under a nitrogen atmosphere, the formula amounts of lithium powder, Ketjen black and styrene-butadiene rubber are mixe...

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Abstract

The invention provides a battery shell and a preparation method thereof, a lithium ion battery and a lithium replenishing method thereof. The battery casing includes a casing, a lithium supplementary layer located on the inner surface of the casing, and a protective layer located on the lithium supplementary layer. The method includes: 1) preparing a lithium-containing slurry, and coating the lithium-containing slurry on the inner surface of the shell to obtain a lithium-replenishing layer; 2) coating the protective layer raw material slurry on the lithium-replenishing layer to prepare a protective layer. layer to obtain the battery case. The battery case provided by the invention has the function of replenishing lithium, and can realize accurate lithium replenishment through precise control of the thickness of the lithium replenishing layer; the protective layer on the lithium replenishing layer can play a role of encapsulation and prevent the oxidation of the lithium replenishing layer, and the battery case is used to prepare Lithium-ion batteries can eliminate the third electrode, improve safety, and increase the energy density of the battery.

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 replenishing method thereof. Background technique [0002] A 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 charging and discharging, Li + Intercalation and deintercalation back and forth between two electrodes: when charging, Li + It is deintercalated from the positive electrode and 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 improve energy density. [0003] The first coulombic efficiency of the positive and negative electrode materials of lithium ion bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/126H01M10/0525H01M10/058H01M10/42H01M10/44
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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