Preparation method of lithium ion battery diaphragm

A technology for lithium ion batteries and separators, which is applied in the field of preparation of lithium ion battery separators, can solve the problems of difficulty in dispersion, easy agglomeration, and difficulty in uniformly dispersing the separator matrix, and achieves good rate performance and cycle performance, and the effect of improving puncture strength.
CN104953071AInactive Publication Date: 2015-09-30CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2015-09-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method of a lithium ion battery diaphragm. The preparation method comprises the following steps: (1) preparing a graphene nanosheet dispersion liquid of which the concentration is lower than or equal to 0.1 g / L; (2) preparing polymer particles of which the particle diameters are smaller than or equal to 600 nm; (3) uniformly mixing the polymer particles, the graphene nanosheet dispersion liquid and a polymer to prepare a polymer, polymer particle and graphene co-mixed casting solution; (4) treating the casting solution according to an immersion precipitation method, so as to obtain a polymer, polymer particle and graphene lithium ion battery diaphragm. The diaphragm prepared according to the preparation method is suitable for different battery material systems, is 4.6V or higher in decomposition voltage, and has the advantages that the porosity rate and the ionic conductivity are respectively 30 percent and 50 percent or higher than those of a pure polymer diaphragm, the puncture strength is improved by 46 percent, and all the service performances are superior.
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Description

technical field

[0001] The invention relates to a preparation method of a lithium ion battery diaphragm. Background technique

[0002] Lithium-ion batteries have become one of the most important chemical power sources in contemporary times due to their advantages such as high energy density, high output voltage, long cycle life, and environmental friendliness. At present, in addition to being widely used in mobile communications, digital products and other fields, lithium-ion batteries are gradually becoming an important power supply system in the fields of energy storage and electric vehicles. In lithium-ion batteries, the separator mainly plays the role of isolating positive and negative electrode materials and conducting lithium ions. The performance of the separator directly determines the cycle performance and safety performance of lithium-ion batteries.

[0003] Lithium-ion batteries, especially power lithium-ion batteries, have stricter requirements on separator perf...

Claims

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