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Diaphragm of electrochemical power supply and preparation method thereof

An electrochemical and diaphragm technology, applied in the field of electrochemical power supply, can solve the problems of low safety performance of electrochemical power supply, no flame retardant performance, low heat resistance temperature, etc., achieve high safety performance, improve skeleton structure, and have wide application prospects Effect

Inactive Publication Date: 2014-02-12
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a heat-resistant diaphragm in the prior art for the defects that the electrochemical power source has a low heat-resistant temperature and the internal materials of the battery do not have flame-retardant properties, resulting in low safety performance of the electrochemical power source. Separator for electrochemical power source with improved temperature, flame retardant effect and thus significantly enhanced safety performance of electrochemical power source and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A diaphragm for electrochemical power sources, comprising a diaphragm base formed of polyethylene and a flame-retardant layer coated on the surface of the diaphragm base, wherein the flame-retardant layer is made of polytetrafluoroethylene and aluminum hydroxide powder with a particle size of 500nm Bulk composition, the thickness of the flame retardant layer is 7 μm. The preparation process of the diaphragm of the electrochemical power supply is as follows:

[0030] Accurately weigh 100g of acetone and place it in a container, add 10g of polytetrafluoroethylene to the acetone, stir until a uniform polytetrafluoroethylene acetone solution is formed; The aluminum hydroxide powder is stirred evenly to obtain a coating suspension; the diaphragm matrix formed by polyethylene is immersed in the above coating suspension, and it is lifted at a constant speed after standing for 30 minutes; the polythene coated with the suspension The ethylene diaphragm substrate was dried in fl...

Embodiment 2

[0032] A diaphragm for electrochemical power sources, comprising a diaphragm base formed of polyethylene and a flame-retardant layer coated on the surface of the diaphragm base, wherein the flame-retardant layer is made of polytetrafluoroethylene and boehmite powder with a particle size of 500nm Bulk composition, the thickness of the flame retardant layer is 7 μm. The preparation process of the diaphragm of the electrochemical power supply is as follows:

[0033] Accurately weigh 100g of acetone and place it in a container, add 10g of polytetrafluoroethylene to the acetone, stir until a uniform polytetrafluoroethylene acetone solution is formed; The boehmite powder is stirred evenly to obtain a suspension for coating; the diaphragm matrix formed by polyethylene is immersed in the suspension for coating, and it is lifted at a constant speed after standing for 30 minutes; the polythene coated with the suspension is The ethylene diaphragm substrate was dried in flowing dry nitro...

Embodiment 3

[0035] A separator for an electrochemical power source, comprising a separator substrate formed of polypropylene and a flame-retardant layer coated on the surface of the separator substrate, wherein the flame-retardant layer is composed of polyvinyl alcohol and boehmite powder with a particle size of 500nm Body and aluminum hydroxide powder, the thickness of the flame retardant layer is 8μm. The preparation process of the diaphragm of the electrochemical power supply is as follows:

[0036] Accurately weigh 50g of chloroform and 50g of acetone and place them in a container, add 2g of polyvinyl alcohol to the mixed solution of chloroform and acetone, stir until a uniform polyvinyl alcohol solution is formed; add 5g of particle size to the above polyvinyl alcohol solution Boehmite powder with a particle size of 500nm and 5g of aluminum hydroxide powder with a particle size of 500nm are stirred evenly to obtain a coating suspension; the surface of the diaphragm base formed by pol...

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Abstract

The invention belongs to the technical field of electrochemical power supply, and discloses a diaphragm of an electrochemical power supply and a preparation method thereof. The diaphragm of an electrochemical power supply comprises a diaphragm substrate formed by polyolefin, and a fire-retardant layer which is coated on the diaphragm substrate and contains inorganic powder, wherein the inorganic powder is composed of boehmite and / or aluminium hydroxide. The preparation method comprises the following steps: preparing coating suspension containing the inorganic powder mentioned above, then evenly coating the suspension on two sides of a diaphragm substrate formed by polyolefin, and drying the diaphragm substrate by baking to form a fire-retardant layer on the surface of the diaphragm substrate so as to obtain the diaphragm of electrochemical power supply. The fire-retardant inorganic powder coated on the surface of the diaphragm substrate not only can improve the heat resistant temperature of the diaphragm, but also enables the diaphragm to have a fire-retardant effect, and provides a double safety guarantees for an electrochemical power supply. The diaphragm of an electrochemical power supply has the advantages of simple and practicable preparation technology, low-cost and available raw material, and convenient promotion and application in the field of power supply production.

Description

technical field [0001] The invention belongs to the technical field of electrochemical power sources, and relates to a diaphragm of high-safety electrochemical power sources and a preparation method thereof. Background technique [0002] With the development of human productivity, more and more cars are driving in the streets and alleys of cities and villages. The popularity of automobiles has brought great convenience to people's lives, but the accompanying problems have become more and more serious. The consumption of non-renewable energy such as petroleum continues to accelerate, and the impact of vehicle exhaust emissions on the environment continues to expand. At present, in order to solve these problems, people propose to develop electric vehicles to replace traditional vehicles. The key to the implementation of this idea lies in whether there is a power battery with sufficient energy density, power density, long enough cycle life, and safe and reliable power battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01G9/02B32B27/06C08J7/04C08L23/00C08L23/06C08L23/12H01M50/446
CPCH01G11/52H01G11/84H01M50/446H01M50/403Y02E60/10
Inventor 周明杰袁贤阳王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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