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Composite coating diaphragm for lithium ion battery and lithium ion battery

A lithium-ion battery and composite coating technology, which is applied to secondary batteries, battery pack components, separators/films/diaphragms/spacers, etc., can solve the problems of low hardness of the diaphragm, poor safety, short circuit of the battery, etc. Achieve high safety performance and simple structure

Pending Publication Date: 2020-05-29
CALB CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The soft ceramic lithium-ion battery separator has low hardness, and it is easy to be pierced by lithium dendrites in the polyolefin microporous membrane base layer during use, resulting in a short circuit of the battery and poor safety.

Method used

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  • Composite coating diaphragm for lithium ion battery and lithium ion battery
  • Composite coating diaphragm for lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The lithium-ion battery of the present embodiment uses the composite coating diaphragm, as figure 1 As shown, it includes a diaphragm substrate 1 and a composite coating 2 disposed on one side of the diaphragm substrate 1; the composite coating 2 includes a silica coating 3 disposed on the diaphragm substrate 1 and a silica coating 3 disposed on the silica coating 3 The first boehmite coating 4 on the top; the lithium-ion battery composite coating separator also includes a second boehmite coating 5 disposed on the other side of the separator substrate 1 . The separator substrate was an unmodified PE film with a thickness of 9 μm; the thickness of the silica coating was 2.5 μm, and the thickness of the first boehmite coating was 1.0 μm. The thickness of the second boehmite coating was 3.0 μm. The particle size of the silica in the silica coating is 0.1 μm, the particle size of the boehmite in the first boehmite coating is 2.2 μm, and the particle size of the boehmite in...

Embodiment 2

[0035] The composite coating separator for lithium ion batteries of this embodiment differs from Example 1 of the composite coating separator for lithium ion batteries only in that the thickness of the silicon dioxide coating is 3.0 μm, and the thickness of the first boehmite coating is The thickness is 0.5 μm, the thickness of the second boehmite coating is 3.5 μm, the particle size of silicon dioxide in the silica coating is 1.2 μm, and the particle size of boehmite in the first boehmite coating is 0.1 μm, the particle size of boehmite in the second boehmite coating is 2.2 μm.

[0036] The preparation method of the composite coating separator for lithium ion batteries in this embodiment is the same as that in Example 1 of the composite coating separator for lithium ion batteries.

Embodiment 3

[0038]The lithium-ion battery composite coating diaphragm of the present embodiment comprises a diaphragm substrate and a composite coating disposed on one side of the diaphragm; the composite coating comprises a silica coating disposed on the diaphragm substrate and a silica coating disposed on the silica coating The first boehmite coating on the layer; the lithium-ion battery composite coating diaphragm also includes a second boehmite coating disposed on the other side of the diaphragm substrate. The separator substrate is an unmodified PE film with a thickness of 9 μm; the thickness of the silica coating is 2.5 μm, the thickness of the first boehmite coating is 1.0 μm, and the thickness of the second boehmite coating is 3.0 The particle size of the silica in the μm silica coating is 1 μm, the particle size of the boehmite in the first boehmite coating is 1.2 μm, and the particle size of the boehmite in the second boehmite coating is 0.1 μm.

[0039] The preparation method ...

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Abstract

The invention relates to a composite coating diaphragm for a lithium ion battery and a lithium ion battery and belongs to the technical field of lithium ion batteries. The composite coating diaphragmfor the lithium ion battery comprises a diaphragm base material and a composite coating arranged on one surface of the diaphragm base material; the composite coating comprises a silicon dioxide coating arranged on the diaphragm base material and a first boehmite coating arranged on the silicon dioxide coating. The silicon dioxide coating of the composite coating diaphragm for the lithium ion battery can avoid the problems of performance attenuation and safety of the battery due to the fact that the diaphragm is punctured after lithium dendrites continuously and quickly grow; the first boehmitecoating which coats on the surface of the silicon dioxide coating prevents the silicon dioxide from reacting with metal lithium on the surface of a negative electrode before the lithium dendrites appear, and therefore, the excessive loss of the effective lithium of the battery can be prevented, and the further growth of the lithium dendrites can be delayed, the service life of the battery is effectively prolonged, and the safety accidents of the battery are reduced.

Description

technical field [0001] The invention relates to a composite coating diaphragm for a lithium ion battery and a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have high energy density, especially power batteries. Ensuring battery safety is the key to battery production and application. During the use of lithium-ion batteries, the formation of lithium dendrites is difficult to completely avoid, and there are many uncertain factors affecting their formation, which is a potential hidden danger during the use of batteries. [0003] Li dendrite growth is one of the fundamental issues affecting the safety and stability of Li-ion batteries. The growth of lithium dendrites will lead to the instability of the electrode and electrolyte interface during the cycle of lithium-ion batteries, destroying the generated solid electrolyte interface (SEI) film, and the growth of lithium dendrites will continue ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525
CPCH01M10/0525H01M50/409Y02E60/10
Inventor 贾海王海文张海峰白莉戴静闻
Owner CALB CO LTD
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