Battery diaphragm and preparation method thereof, lithium ion battery and electric vehicle

A battery diaphragm and base film technology, applied in secondary batteries, battery components, circuits, etc., can solve the problems of uneven distribution of pore structure, low surface porosity of battery diaphragm, and poor thermal shrinkage resistance of the diaphragm. Low shrinkage, improved strength, and the effect of preventing short-circuiting of the positive and negative electrodes of the battery

Active Publication Date: 2021-11-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defects of low surface porosity, uneven distribution of pore structure, and poor thermal shrinkage resistance of the separator in the prior art, the present invention provides a battery separator, which includes a polymer fiber layer, Wherein, the polymer fiber layer contains polymer fibers, and the polymer fibers contain cross-linked polymers, and the cross-linked polymers are made of modified polyethylene terephthalate and acrylic polymers. cross-linked;

Method used

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  • Battery diaphragm and preparation method thereof, lithium ion battery and electric vehicle
  • Battery diaphragm and preparation method thereof, lithium ion battery and electric vehicle

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preparation example Construction

[0044] A second aspect, the present invention also provides a method for preparing a battery separator, wherein the method comprises the steps of:

[0045] (1) A polyethylene terephthalate surface modified to contain hydroxyl and / or carboxyl, or made with a carbon-carbon double to obtain a modified polyethylene terephthalate;

[0046] (2) the modified polyethylene terephthalate and acrylic polymer blend is formed by melt-spinning a polymer fiber layer.

[0047] According to the present invention, as described above for polyethylene terephthalate modified method have been fully described, in order to avoid unnecessary repetition, where not repeated herein.

[0048] Wherein, in step (1), the silane coupling agent and the weight ratio of polyethylene terephthalate ester is 0.05: 1 to 0.5: 1, the silane coupling agent and polyethylene terephthalate the weight ratio of alcohol esters within the above range, the modified polyethylene terephthalate with a suitable number can be hydroxy...

Embodiment 1

[0083] Battery separator was prepared as follows:

[0084](1) First polyethylene terephthalate with 0.1mol / L of a silane coupling agent, 3-acryloxypropyl trimethoxysilane is N, N- dimethylformamide solution at 60 deg.] C processing 2h, to obtain a modified polyethylene terephthalate. The amount of the silane coupling agent and the hydroxyl group content such that polyethylene glycol esters of carboxyl group content of the surface acid Table 2.

[0085] (2) prepared in Step (1) obtained in polyethylene terephthalate modified with butyl acrylate esters - obtained by mixing a copolymer of hydroxyethyl acrylate polymer fiber layer composition. Wherein the modified polyethylene terephthalate content of 90 wt% butyl acrylate, - hydroxyethyl acrylate copolymer in an amount of 10 wt%. 200 ℃ heated and melted, and then on the surface side of the base film PE electrospinning was dried at 60 deg.] C for 2 hours and dried on the other surface spinning at 60 deg.] C using the same method and...

Embodiment 2

[0088] (1) First polyethylene terephthalate with 0.2mol / L of a silane coupling agent 3-methacryloxypropyl trimethoxy silane N, N- dimethyl formamide at 50 ℃ treatment at 3h, to obtain a modified polyethylene terephthalate. The amount of the silane coupling agent and the hydroxyl group content such that polyethylene glycol esters of carboxyl group content of the surface acid Table 2.

[0089] (2) the step of polyethylene terephthalate modified with butyl acrylate (1) obtained in Preparation - hydroxyethyl acrylate copolymer and mixing sodium hexametaphosphate, wherein the modified polyethylene terephthalate ethylene glycol content of 85 wt% butyl acrylate - hydroxyethyl acrylate copolymer in an amount of 10 wt%, the content of the dispersant is 5 wt%. Then heated at 200 ℃ melted, and electrostatic spinning on one surface of the base film of PE, was dried at 60 deg.] C for 2 hours and dried on the other surface spinning at 60 ℃ dried for 24 hours by the same method, obtained batte...

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Abstract

The invention relates to the technical field of battery materials, and discloses a battery diaphragm and a preparation method thereof, a lithium ion battery and an electric vehicle. The battery separator includes a polymer fiber layer, wherein the polymer fiber layer contains polymer fibers, and the polymer fibers contain cross-linked polymers, and the cross-linked polymers are made of modified polyethylene terephthalate Glycol ester and acrylate polymer are cross-linked; wherein, the modified polyethylene terephthalate contains hydroxyl and / or carboxyl groups, or the modified polyethylene terephthalate has There are carbon-carbon double bonds. The battery separator provided by the invention has good thermal shrinkage resistance, many and evenly distributed pores, good air permeability, and can meet the safety and electrochemical performance requirements of lithium batteries.

Description

Technical field [0001] Technical Field The present invention relates to a battery material, particularly relates to a battery separator and a method for preparing a battery separator of the thus prepared battery separator, and a lithium ion battery comprising the battery separator, and a lithium ion battery including an electric vehicle. Background technique [0002] The main role of the separator is the battery positive and negative poles spaced apart, to prevent a short circuit contact with the poles, in addition to having a function of electrolyte ions can pass, it directly affects the performance of the battery separator of the battery capacity, cycle characteristics and safety performance , a separator having excellent properties important role in improving the overall performance of the battery. [0003] CN20161006843A discloses a lithium ion battery separator ceramic slurry Specifically, the lithium ion battery separator comprising a ceramic base film and a coating on one ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/44H01M50/411H01M50/491H01M50/403H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 高磊刘荣华单军
Owner BYD CO LTD
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