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Lithium ion battery diaphragm and preparation method and application thereof

A lithium-ion battery and separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of slow seepage rate and long seepage time, improve interface performance, increase seepage speed, and improve Effects of wettability and liquid uptake

Inactive Publication Date: 2020-11-13
DONGGUAN CHUANGMING BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide a lithium-ion battery diaphragm and its preparation method and application, aiming to solve the problems of relatively long liquid seepage time and slow liquid seepage rate of composite diaphragms coated with ceramic coating layers in the prior art

Method used

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  • Lithium ion battery diaphragm and preparation method and application thereof
  • Lithium ion battery diaphragm and preparation method and application thereof
  • Lithium ion battery diaphragm and preparation method and application thereof

Examples

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preparation example Construction

[0035] The second aspect of the embodiment of the present application provides a method for preparing a lithium-ion battery separator, comprising the following steps:

[0036] S01. mixing lignin and its derivatives with a binder to obtain a coating material;

[0037] S02. Coating the coating material on at least one surface of the separator substrate and drying it to obtain a lithium-ion battery separator.

[0038] The preparation method of the lithium-ion battery diaphragm provided in the second aspect of the present application is simple and easy to operate. The coating material is mixed and coated on at least one surface of the diaphragm substrate, and then dried. The preparation method The materials are easy to obtain, the production method is environment-friendly, and the production process is simple and controllable.

[0039] Specifically, in the above step S01, the lignin and its derivatives are mixed with the binder to obtain the coating material, wherein the lignin a...

Embodiment 1

[0066] Lithium-ion battery separator and preparation method thereof

[0067] The lithium-ion battery separator provided includes a separator substrate and a coating provided on at least one surface of the separator substrate; wherein, the material of the coating is selected from lignin; and the thickness of the coating is 3 μm.

[0068] A preparation method for a lithium-ion battery diaphragm, comprising the steps of:

[0069] Mix the lignin with the binder, the mass ratio of the lignin to the binder is 95:5 to obtain the coating material,

[0070] placing the diaphragm substrate on a coating machine, and coating the coating material on at least one surface of the diaphragm substrate at normal temperature to obtain a first diaphragm substrate,

[0071] The first separator substrate was placed at a temperature of 45° C. for vacuum drying for 24 hours to obtain a lithium ion battery separator.

[0072] Preparation of lithium-ion batteries

[0073] Grind the positive elect...

Embodiment 2

[0078] Lithium-ion battery separator and preparation method thereof

[0079] The lithium-ion battery separator provided includes a separator substrate and a coating provided on at least one surface of the separator substrate; wherein, the material of the coating is selected from lignosulfonate; the thickness of the coating is 4 μm.

[0080] A preparation method for a lithium-ion battery diaphragm, comprising the steps of:

[0081] Mix the lignin with the binder, the mass ratio of the lignosulfonate to the binder is 97:3 to obtain the coating material,

[0082] placing the diaphragm substrate on a coating machine, and coating the coating material on at least one surface of the diaphragm substrate at normal temperature to obtain a first diaphragm substrate,

[0083] The first separator substrate was placed at a temperature of 44° C. for vacuum drying for 25 hours to obtain a lithium-ion battery separator.

[0084] Preparation of lithium-ion batteries

[0085] Grind the posi...

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Abstract

The invention provides a lithium ion battery diaphragm. The lithium ion battery diaphragm comprises a diaphragm base material and a coating arranged on at least one surface of the diaphragm base material, wherein the material of the coating is selected from lignin and derivatives thereof; lignin and derivatives thereof are phenolic polymers, the molecular structure contains oxo-phenylpropanol or derivative structural units thereof, a three-dimensional structure can be formed in the polymerization process, and the coating layer with the three-dimensional structure can expand the transportationand storage channels of the electrolyte, so that the seepage speed of the electrolyte is increased; meanwhile, lignin and derivatives thereof contain hydroxyl functional groups, have high polarity, and can be used as a coating material to improve the lyophilic performance of the lithium ion battery diaphragm to an electrolyte and improve the interface performance of the diaphragm, so that the wettability and the liquid absorption rate of the diaphragm to the electrolyte are improved, and the safety performance of the lithium ion battery is further improved.

Description

technical field [0001] The application belongs to the technical field of batteries, and in particular relates to a lithium-ion battery diaphragm, a preparation method of a lithium-ion battery diaphragm, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and uses a non-aqueous electrolyte solution. It has the following advantages: (1) high energy density; (2) large output power; (3) no memory effect , easy to use and maintain; (4) low self-discharge; (5) wide operating temperature range; (6) fast charging and discharging speed, therefore, lithium-ion batteries are widely used in consumer electronics products, electric vehicle products, military products, aviation products and other fields. [0003] Lithium-ion batteries are composed of positive and negative electrodes, electrolytes, and separators. Among them, the separator is the core compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 赵斯琦赵悠曼
Owner DONGGUAN CHUANGMING BATTERY TECH
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