Preparation method and application of polyolefin/nanocrystalline cellulose composite membrane

A nanocrystal, composite diaphragm technology, applied in the direction of separators/films/diaphragms/spacers, structural parts, electrical components, etc., can solve the complex phase inversion method, the inorganic coating of the composite strength of the diaphragm is easy to fall off, and the hidden dangers of safety, etc. problems, to achieve the effect of improving puncture resistance and tensile strength, ensuring ionic conductivity, and not easy to fall off
CN105185940BInactive Publication Date: 2018-10-09XUCHENG FUJIAN SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XUCHENG FUJIAN SCI & TECH
Publication Date
2018-10-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to the field of diaphragm materials, in particular to a preparation method and application of a polyolefin / nanocrystalline cellulose composite diaphragm. The preparation method includes the following steps: (1) Preparation of nanocrystalline cellulose sodium dispersion; ( 2) Surface pretreatment of the matrix membrane; (3) Coating treatment of the modified porous membrane; the polyolefin / nanocrystalline cellulose composite diaphragm of the present invention is applied in the field of lithium-ion batteries. The nanocrystalline cellulose of the present invention is to adjust the length of the nanocrystalline cellulose by changing the formula of acid hydrolysis, and improve the porosity and ion conductivity of the composite diaphragm. The present invention uses LBL technology, which can be coated on the surface of the modified porous membrane by adjusting The thickness of the composite diaphragm can be changed by the number of times of coating, and the nanocrystalline cellulose has good mechanical strength, thereby greatly improving the puncture resistance and tensile strength of the composite diaphragm and the heat resistance of the matrix film.
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Description

technical field

[0001] The invention relates to the field of diaphragm materials, in particular to a preparation method and application of a polyolefin / nanocrystalline cellulose composite diaphragm. Background technique

[0002] Lithium-ion batteries are considered to be one of the most promising forms of new energy power due to their excellent electrical properties such as high energy density, long cycle life, and high voltage, and have become a research hotspot in today's second-generation batteries. Computers, cameras, video cameras, electric vehicles, electric bicycles, large power supplies and other fields. In the structure of lithium batteries, although the separator does not participate in the battery reaction, it is one of the key inner components. The lithium-ion battery separator is generally a porous polymer film, which connects and separates the positive and negative electrode materials. It is an electronic insulator, but allows lithium ions to pass through quic...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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