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Lithium-ion secondary battery, separator and preparation method thereof

A technology of secondary batteries and separators, applied in secondary batteries, battery pack components, circuits, etc., to avoid combustion and explosion, reduce deformation problems, and avoid short circuits

Active Publication Date: 2015-12-02
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems existing in the background technology, the object of the present invention is to provide a lithium-ion secondary battery and its separator and preparation method, the separator has good physical and mechanical properties, high temperature resistance and bonding performance, can effectively Improve the safety and deformation of lithium-ion secondary batteries

Method used

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  • Lithium-ion secondary battery, separator and preparation method thereof
  • Lithium-ion secondary battery, separator and preparation method thereof
  • Lithium-ion secondary battery, separator and preparation method thereof

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preparation example Construction

[0029] The preparation method of the separator of the lithium ion secondary battery according to the second aspect of the present invention is used to prepare the separator of the lithium ion secondary battery according to the first aspect of the present invention, comprising the steps of: (1) mixing an organic solvent, The catalyst is added to a three-port reaction kettle with a temperature sensor, a condensing reflux pipe, and a stirring paddle, and then the first monomer, the second monomer, and the third monomer are added to the three-port reaction kettle while stirring, and the reaction is stirred at room temperature. Then heat up and continue to stir the reaction to obtain the A section with isocyanate groups at the end; (2) add the aprotic polar solvent to another three-port reaction kettle with a temperature sensor, a condensing reflux pipe, and a stirring paddle and heat up, and then to the In another three-port reactor, add the fourth monomer and the fifth monomer whi...

Embodiment 1

[0044] 1. Preparation of separator for lithium-ion secondary batteries

[0045] (1) Add 200 mass parts of rectified organic solvent methyl ethyl ketone and 0.1 mass part of catalyst organotin into a three-port reaction kettle with a temperature sensor, a condensation reflux pipe, and a stirring paddle, and then stir in the three-port reaction kettle Add 500 parts by mass of polyester diol (the first monomer) with a weight average molecular weight of 2000 and 33.50 parts by mass of 2,2-dimethylolpropionic acid (the third monomer), then slowly drop 111.15 parts by mass of iso For pherone diisocyanate (the second monomer), first stir and react at room temperature for 1 h, then stir and react at 80°C for 4 h to obtain segment A with an isocyanate group at the end;

[0046] (2) At the same time, add the aprotic polar solvent N-methylpyrrolidone of 3.2 parts by mass of rectification into another three-port reactor with a temperature sensor, a condensing reflux pipe, and a stirring p...

Embodiment 2

[0059] Lithium-ion secondary batteries were prepared according to the method of Example 1, except that in the step of preparing the separator of lithium-ion secondary batteries (i.e. step 1), the first monomer was 250 parts by mass of polyether disulfide with a weight-average molecular weight of 1000. alcohol, the second monomer is 84.10 parts by mass of hexamethylene diisocyanate, the fourth monomer is 1.80 parts by mass of p-phenylenediamine, and the fifth monomer is 2.23 parts by mass of 1,4,5,8-naphthalene Tetraformic dianhydride; the thickness of the porous substrate is 8 μm, the thickness of the coating on one side is 3 μm.

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Abstract

The invention provides a lithium ion secondary battery as well as an isolating membrane and a preparation method of the isolating membrane. The isolating membrane comprises a porous substrate and a coating, wherein the coating is arranged on the at least one side of the porous substrate. The coating contains polyurethane with the structure shown in formula 1; the polyurethane is formed by a section A with isocyanate group at the tail end and a section B with amido at the tail end which have reaction between the isocyanate group and the amido so as to generate urea bond; in the polyurethane, m and n are integers which are larger than or equal to 1; the section A is generated by the reaction among monomers R1, R2 and R3; the section B is generated by the reaction between monomers R4 and R5. The lithium ion secondary battery comprises the isolating membrane. The isolating membrane has good physical and mechanical properties, high temperature resistance and adhesive property, and effectively improves the safety of the lithium ion secondary battery and solves the problems of the deformation of the lithium ion secondary battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion secondary battery, a separator and a preparation method thereof. Background technique [0002] Today, with the rapid development of science and technology, various mobile electronic devices are widely used in human life, and lithium secondary batteries have also rapidly developed into an important industry in the field of secondary batteries. Lithium-ion secondary batteries far exceed other secondary batteries in terms of specific capacity, memory effect, cycle life, and environmental protection, so they are called "ultimate batteries". However, there are still some problems in existing lithium-ion secondary batteries. [0003] (1) In terms of safety: due to the lack of physical and mechanical strength of the separator and the large number of holes, once lithium is deposited on the negative plate, the separator is easily penetrated by lithium dendrites, resulting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/423
CPCY02E60/122H01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 申红光牛少军谈时程晟伍永彬
Owner NINGDE AMPEREX TECH
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