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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 are easy to shrink, the two-layer interface is produced due to long-term exposure to a large difference in thermal shrinkage stress. Necessary strain causes diaphragm damage

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

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preparation example Construction

[0071] According to a second aspect of the present invention, a kind of preparation method of lithium-ion battery separator is provided, comprising the following steps:

[0072] Uniformly coat the cyclodextrin polymer slurry on the PP / PE / PP porous film substrate to form a cyclodextrin polymer layer, and obtain a lithium-ion battery separator after drying;

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

[0074] The cyclodextrin polymer slurry is obtained by dissolving or dispersing the cyclodextrin cross-linked polymer in water, and can form a gel state fluid. The viscosity of the cyclodextrin polymer slurry is preferably 50-500mPa·s, such as 50mPa·s 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 cyclodextrin cross...

Embodiment 1

[0102] A lithium ion battery separator, comprising 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 being 1 μm.

[0103] A preparation method for a lithium-ion battery diaphragm, comprising the following steps:

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

[0105] (2) Dissolving 25 parts by weight of 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 cyclodextrin polymer slurry;

[0107] (4) The cyclodextrin polymer slurry was uniformly coated on one side of the Celguard 16 μm separator substrate, and dried to obtain a lithium ion battery separator coated with a cyclodextrin polymer layer.

Embodiment 2

[0109] A lithium ion battery separator, comprising 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 being 0.5 μm.

[0110] A preparation method for a lithium-ion battery diaphragm, comprising the following steps:

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

[0112] (2) Dissolving 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 cyclodextrin polymer slurry;

[0114] (4) The cyclodextrin polymer slurry is evenly coated on one side of the Celguard 10 μm separator substrate, and dried to obtain a lithium ion battery separator coated with a cyclodextrin polymer layer.

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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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