Lithium ion battery separator, preparation method thereof and lithium ion battery

A technology for lithium ion batteries and separators, applied in the field of lithium ion battery separators and their preparation, can solve problems such as damage to the separators, and achieve the effects of reducing thermal shrinkage rate, reducing capacity decay, and being difficult to fall off.

Inactive Publication Date: 2018-08-17
BEIJING NAT BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Later, ceramic-coated separators appeared, but ceramics are a material with strong heat-resistant shrinkage. When they are coated with lithium battery separator materials that

Method used

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  • Lithium ion battery separator, preparation method thereof and lithium ion battery
  • Lithium ion battery separator, preparation method thereof and lithium ion battery
  • Lithium ion battery separator, preparation method thereof and lithium ion battery

Examples

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Example Embodiment

[0071] According to a second aspect of the present invention, there is provided a method for preparing a lithium ion battery separator, which includes the following steps:

[0072] Coat the cyclodextrin polymer slurry uniformly on the PP / PE / PP porous membrane substrate to form a cyclodextrin polymer layer, and then obtain a lithium ion battery separator after drying;

[0073] The cyclodextrin polymer slurry includes a cyclodextrin polymer and water.

[0074] The cyclodextrin polymer slurry is obtained by dissolving or dispersing a cyclodextrin cross-linked polymer in water, and can form a gel state fluid. Preferably, the viscosity of the cyclodextrin polymer slurry is 50-500 mPa·s, for example, 50 mPa· s, 100mPa·s, 120mPa·s, 150mPa·s, 200mPa·s, 300mPa·s, 400mPa·s, or 500mPa·s.

[0075] The cyclodextrin polymer is preferably a cyclodextrin cross-linked polymer, which is obtained after the main cyclodextrin is cross-linked by an appropriate cross-linking agent. The source of the cyclode...

Example Embodiment

[0101] Example 1

[0102] A lithium ion battery separator includes a Celguard 16 μm separator substrate and a cyclodextrin polymer layer on the surface of the Celguard 16 μm separator substrate. The thickness of the cyclodextrin polymer layer is 1 μm.

[0103] The preparation method of lithium ion battery separator includes the following steps:

[0104] (1) Dissolve 0.5 parts by weight of binder, 3 parts by weight of aqueous dispersant and 0.1 parts by weight of surfactant in 50 parts by weight of water to obtain solution A;

[0105] (2) Dissolve 25 parts by weight of the cyclodextrin polymer in the remaining 50 parts by weight of water to obtain solution B;

[0106] (3) Mix solution A and solution B uniformly to obtain a cyclodextrin polymer slurry;

[0107] (4) The cyclodextrin polymer slurry is uniformly coated on one side of the Celguard 16 μm separator substrate, and after drying, a lithium ion battery separator coated with a cyclodextrin polymer layer is obtained.

Example Embodiment

[0108] Example 2

[0109] A lithium ion battery separator includes a Celguard 10 μm separator substrate and a cyclodextrin polymer layer on the surface of the Celguard 10 μm separator substrate. The thickness of the cyclodextrin polymer layer is 0.5 μm.

[0110] The preparation method of lithium ion battery separator includes the following steps:

[0111] (1) Dissolve 2 parts by weight of binder, 0.1 parts by weight of aqueous dispersant and 2 parts by weight of surfactant in 30 parts by weight of water to obtain solution A;

[0112] (2) Dissolve 10 parts by weight of cyclodextrin polymer in the remaining 30 parts by weight of water to obtain solution B;

[0113] (3) Mix solution A and solution B uniformly to obtain a cyclodextrin polymer slurry;

[0114] (4) The cyclodextrin polymer slurry is uniformly coated on one side of the Celguard 10 μm separator substrate, and after drying, a lithium ion battery separator coated with a cyclodextrin polymer layer is obtained.

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Abstract

The invention discloses a lithium ion battery separator, a preparation method thereof and a lithium ion battery, and relates to the technical field of lithium ion batteries. The lithium ion battery separator comprises a PP/PE/PP porous film substrate and a cyclodextrin polymer layer. The preparation method of the lithium ion battery separator comprises the following steps of uniformly coating cyclodextrin polymer paste on the PP/PE/PP porous film substrate to form a cyclodextrin polymer layer, and obtaining the lithium ion battery separator after drying, wherein the cyclodextrin polymer pastecomprises a cyclodextrin polymer and water. By the lithium ion battery separator and the preparation method thereof, the defects that a traditional separator matrix material is not resistant to high temperature and is poor in safety and a ceramic coating separator is easy to damage are overcome, the cyclodextrin polymer layer of the lithium ion battery is difficult to fall off, and the coated separator has relatively good electrochemical performance and mechanical property, is low in thermal shrinkage rate and good in safety and is suitable for high-rate charging and discharging.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery diaphragm, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion battery is a secondary battery with high energy density. With the development of the times, its cost has gradually decreased and its application has been promoted, especially in the fields of electric vehicles and energy storage. The safety of lithium-ion batteries restricts its further development and application. [0003] The diaphragm is an important component of the lithium-ion battery. The main function of the diaphragm in the lithium-ion battery is to separate the positive and negative electrodes of the battery and prevent the two poles from contacting and short-circuiting. It is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which dire...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417
CPCH01M10/0525H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 魏彦聪郭伟吴丛笑张景舒赵冬梅文哲泽栗瑞芹
Owner BEIJING NAT BATTERY TECH
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