Organic-inorganic composite lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery and inorganic composite technology, which is applied to battery components, chemical instruments and methods, circuits, etc., can solve the problems that the diaphragm is easy to be melted by high temperature, explode, and discharge power is large, and achieve micropore penetration and high temperature good stability effect
CN103682218AInactive Publication Date: 2014-03-26SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
Publication Date
2014-03-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an organic-inorganic composite lithium ion battery diaphragm and a preparation method thereof. The diaphragm is a composite membrane formed by reinforcing organic resin by inorganic particles, wherein the inorganic particles account for 0.1 percent by mass to 20 percent by mass and the organic resin accounts for 10 percent by mass to 70 percent by mass. Preparation of the diaphragm comprises the following steps of: firstly, stirring the organic resin, the inorganic particles and a diluent according to a certain proportion at a temperature of 150 to 280 DEG C to form homogeneous solution; then carrying out hot-pressing on the obtained homogeneous solution at a temperature of 150 to 220 DEG C to form a flat sheet membrane with a thickness of 20 to 1,000 micron; cooling the flat sheet membrane to the room temperature by adopting water bath with a temperature of 0-100 DEG C or at a cooling speed of 0-200 DEG C / min; finally, carrying out operation of firstly stretching and then extracting or firstly extracting and then stretching and drying processing on the cooled flat sheet membrane. The diaphragm provided by the invention has the advantages of easiness for controlling the porosity, adjustability for the aperture, micropore penetration, good high-temperature stability and the like.
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Description

technical field

[0001] The invention relates to a lithium-ion battery diaphragm and a preparation method thereof, in particular to an organic-inorganic composite lithium-ion battery diaphragm and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique

[0002] Since the lithium-ion battery was successfully developed, it has been widely used in the fields of mobile phones, portable computers, cameras, video cameras and other electronic products due to its excellent performance such as high working voltage, high energy density, low pollution, and no memory effect. In recent years, some emerging fields such as hybrid vehicles, electric vehicles, and aircraft models have put forward higher requirements for lithium-ion batteries. Due to the potential explosion hazard of lithium-ion batteries, especially in the use of high-power lithium-ion batteries, its safety is more severely challenged. How to obtain lithium-ion batteries w...

Claims

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