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Lithium ion secondary battery as well as isolating membrane and preparation method of isolating membrane

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

Active Publication Date: 2014-07-02
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 as well as isolating membrane and preparation method of isolating membrane
  • Lithium ion secondary battery as well as isolating membrane and preparation method of isolating membrane
  • Lithium ion secondary battery as well as isolating membrane and preparation method of isolating membrane

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preparation example Construction

[0030] The method for preparing a separator for a lithium-ion secondary battery according to the second aspect of the present invention is used to prepare the separator for a 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 monomer R is added to the three-port reaction kettle while stirring. 1 , R 2 , R 3 , Stir the reaction at room temperature, then raise the temperature and continue to stir the reaction to obtain a segment A with an isocyanate group at the end; (2) Add the aprotic polar solvent to another three-port reaction kettle with a temperature sensor, a condensing reflux tube, and a stirring paddle and heat up, and then add monomer R to the other three-port reactor while stirring 4 , R 5 And react to obtain segment B with amine group...

Embodiment 1

[0045] 1. Preparation of separator for lithium-ion secondary batteries

[0046] (1) Add 200 parts by mass of the rectified organic solvent butanone and 0.1 parts by mass of the catalyst organotin into a three-port reaction kettle with a temperature sensor, a condensation reflux pipe, and a stirring paddle, and then pour it into the three-port reaction kettle while stirring Add 500 mass parts weight-average molecular weight and be 2000 polyester diols (monomer R 1 ) and 33.50 parts by mass of 2,2-dimethylolpropionic acid (monomer R 3 ), and then slowly drop 111.15 parts by mass of isophorone diisocyanate (monomer R 2 ), first stirring the reaction at room temperature for 1 h, and then stirring the reaction at 80 ° C for 4 h to obtain a segment A with an isocyanate group at the end;

[0047] (2) At the same time, add 3.2 parts by mass of the rectified aprotic polar solvent N-methylpyrrolidone into another three-port reactor with a temperature sensor, a condensing reflux pipe, ...

Embodiment 2

[0060] 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 monomer R 1 250 parts by mass of polyether diol with a weight average molecular weight of 1000, R 2 is 84.10 parts by mass of hexamethylene diisocyanate, R 4 is 1.80 parts by mass of p-phenylenediamine, R 5 2.23 parts by mass of 1,4,5,8-naphthalene tetracarboxylic dianhydride; the thickness of the porous substrate is 8 μm, and the thickness of the coating on one surface 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 insufficient 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, resul...

Claims

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Application Information

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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