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Diaphragm

A diaphragm and base film technology, applied in the field of new power supplies, can solve the problems of not being able to provide storage electrolyte space and high temperature resistance, single particle size, and inapplicability, and achieve the effects of light weight, low surface density, and large porosity

Inactive Publication Date: 2015-05-20
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the current separator, the ceramic used as the coating uses a single particle size, resulting in a high density and low porosity situation
It cannot provide enough space for storing electrolyte and high temperature resistance, and cannot be applied to the high-end and light 3C digital products and power vehicles that are currently developing at a high speed.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] A separator comprising a base film and a coating; the coating coats the surface of the base film. The coating is composed of first ceramic particles and second ceramic particles; the median particle size of the first ceramic particles is 600nm, and the specific surface area is 27m 2 / g; the median diameter of the second ceramic particle is 100nm, and the specific surface area is 39m 2 / g. Ceramic particles are non-spherical particles. The weight ratio of the first ceramic particles is 65, and the weight ratio of the second ceramic particles is 35. The thickness of the coating is 1.5um. The base film is made of polyethylene. The ceramic particles are a mixture of alumina, silica, zirconia, aluminum nitride, boron nitride and silicon nitride.

Embodiment 2

[0021] A separator comprising a base film and a coating; the coating coats the surface of the base film. The coating is composed of first ceramic particles and second ceramic particles; the median particle size of the first ceramic particles is 1000nm, and the specific surface area is 17m 2 / g; the median diameter of the second ceramic particle is 400nm, and the specific surface area is 29m 2 / g. Ceramic particles are non-spherical particles. The weight ratio of the first ceramic particles is 75, and the weight ratio of the second ceramic particles is 25. The thickness of the coating is 10um. The base film is made of polypropylene. The ceramic particles are a mixture of alumina, silica, zirconia, aluminum nitride, boron nitride and silicon nitride.

Embodiment 3

[0023] A separator comprising a base film and a coating; the coating coats the surface of the base film. The coating is composed of first ceramic particles and second ceramic particles; the median particle size of the first ceramic particles is 800nm, and the specific surface area is 22m 2 / g; the median diameter of the second ceramic particle is 250nm, and the specific surface area is 34m 2 / g. Ceramic particles are non-spherical particles. The weight ratio of the first ceramic particles is 70, and the weight ratio of the second ceramic particles is 30. The thickness of the coating is 5um. The base film is made of polypropylene. The ceramic particles are a mixture of alumina, silica, zirconia, aluminum nitride, boron nitride and silicon nitride.

[0024] Effect comparison: compare the separator of the present invention with the current conventional base film in terms of air permeability, porosity, tensile strength, thermal shrinkage and battery performance:

[0025] 1. ...

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Abstract

The invention relates to a diaphragm. The diaphragm comprises a base film and a coating; the coating is coated on the surface of the base film; and the coating is composed of ceramic particles with two or more than two particle sizes. The diaphragm has the advantages of low surface density, high porosity, provision of enough electrolyte storage space, and high temperature resistance.

Description

technical field [0001] The invention relates to the technical field of novel power supplies, in particular to a diaphragm. technical background [0002] With the advancement of information, materials and energy technologies, lithium-ion batteries have become a hot spot in the research of new power supply technologies due to their advantages such as high specific energy, long cycle life, no memory effect, safety and reliability, and fast charging and discharging. A lithium-ion battery consists of a positive electrode, a negative electrode, an electrolyte, a diaphragm, and a battery case. [0003] Among them, the separator, as the "third pole" of the battery, is one of the key inner components in the lithium-ion battery. The separator is located between the positive and negative electrodes of the lithium-ion battery and is the most critical part of the lithium-ion battery. The main function of the battery separator is to separate the positive and negative electrodes in the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/434H01M50/443H01M50/489H01M50/491
CPCY02E60/10
Inventor 李晓明
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD