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Nondestructive lithium-supplementing composite diaphragm as well as preparation method and application thereof

A technology of composite diaphragm and lithium supplementation, applied in the direction of final product manufacturing, sustainable manufacturing/processing, batteries, etc., can solve the problems of restricting applications, high decomposition voltage, etc., solve safety problems, avoid heat shrinkage, improve mechanical strength and The effect of heat resistance

Active Publication Date: 2022-05-27
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, organic lithium-supplementing materials usually have a relatively high decomposition voltage, which is beyond the stable electrochemical window range of commercial electrolytes (below 4.4V vs. Li / Li + ), which severely restricts their application in batteries, but unfortunately, there is currently no related technology to solve this problem

Method used

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  • Nondestructive lithium-supplementing composite diaphragm as well as preparation method and application thereof
  • Nondestructive lithium-supplementing composite diaphragm as well as preparation method and application thereof
  • Nondestructive lithium-supplementing composite diaphragm as well as preparation method and application thereof

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preparation example Construction

[0020] The present invention also provides a method for preparing a non-destructive lithium-replenishing composite separator, wherein the non-destructive lithium-replenishing composite separator includes: a base film layer and a functional layer, and the functional layer is formed by coating, dipping or filling in the lithium-replenishing slurry. The base film layer is dried and prepared, and the lithium-replenishing slurry contains: an organic lithium-replenishing agent, a catalyst, a conductive agent, a binder and a solvent, wherein the organic lithium-replenishing agent is a lithium carbon oxide compound , the catalyst is a transition metal carbide.

[0021] The solvent can be a solvent commonly used in the art, for example, one or more of N-methylpyrrolidone, tetrahydrofuran, dimethylformamide, water and absolute ethanol. The present invention does not limit the amount of the solvent, as long as the lithium-replenishing slurry can be mixed uniformly.

[0022] The drying m...

Embodiment 1

[0027] 0.1 g of an organic lithium supplementing agent, 0.5 g of a conductive agent, and 0.3 g of a catalyst are mixed uniformly, and then uniformly mixed with 0.1 g of polyvinylidene fluoride and 2 ml of N-methylpyrrolidone to obtain a lithium supplementary slurry for use.

[0028] The obtained lithium-replenishing slurry is coated on a polypropylene PP film, then vacuum-dried at 100° C. for 12 hours, and then rolled to obtain the non-destructive lithium-replenishing composite separator A1 of the present invention.

Embodiment 2

[0030] 0.5g of organic lithium-supplementing agent, 0.3g of conductive agent, and 0.1g of catalyst were mixed uniformly, and then uniformly mixed with 0.1g of polyvinylidene fluoride and 2ml of N-methylpyrrolidone to obtain a lithium-supplementary slurry for use.

[0031] The obtained lithium-replenishing slurry is coated on a polypropylene PP film, then vacuum-dried at 120° C. for 5 hours, and then rolled to obtain the non-destructive lithium-replenishing composite separator A2 of the present invention.

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Abstract

The invention provides a lossless lithium supplement composite diaphragm, which is characterized in that the lossless lithium supplement composite diaphragm comprises a substrate film layer and a functional layer, the functional layer comprises an organic lithium supplement agent, a catalyst, a conductive agent and a binder, the organic lithium supplement agent is a lithium carbon oxide compound, and the catalyst is a transition metal carbide. According to the lossless lithium-supplementing composite diaphragm provided by the invention, the decomposition potential of the organic lithium-supplementing material can be reduced to 4.4 V or below.

Description

technical field [0001] The present invention relates to a non-destructive lithium-replenishing composite diaphragm and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been used in 3C electronic products and electric vehicles due to their advantages of high energy density, long cycle life and no memory effect. Lithium-ion batteries are mainly composed of positive and negative electrode sheets, separators, electrolytes and shells. The main function of the separators is to avoid short-circuits caused by direct contact between positive and negative electrodes, and at the same time provide a transmission channel for lithium ion migration. The performance of the separator directly determines the performance of the battery, but the current commercial polyethylene or polypropylene separator will have obvious shrinkage deformation when the temperature exceeds 150 °C, which will easily lead to the contact between the positive and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/446H01M50/449H01M50/403H01M10/0525H01M10/42
CPCH01M50/446H01M50/449H01M50/403H01M10/0525H01M10/4235H01M2220/10H01M2220/20Y02P70/50
Inventor 谢佳刘猛闯李书萍
Owner HUAZHONG UNIV OF SCI & TECH
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