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Lithium sulfonate terpolymer and preparation method thereof

A technology of terpolymer and lithium sulfonate, which is applied in the fields of lithium sulfonate terpolymer and its preparation, lithium ion polymer and its preparation, to achieve high energy density, no memory effect, and good safety performance

Active Publication Date: 2021-01-22
JINCHUANGJING NEW MATERIAL TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, due to the introduction of a large number of carbon-hydrogen bonds (C-H) in the above-mentioned copolymerization process, its stability is not as high as the carbon-fluorine bond (C-F) in the PVDF structure. Therefore, the chemical stability and other properties of the copolymer obtained in this way are better. Lower than the corresponding index of PVDF homopolymer

Method used

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  • Lithium sulfonate terpolymer and preparation method thereof
  • Lithium sulfonate terpolymer and preparation method thereof
  • Lithium sulfonate terpolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] This embodiment provides a lithium sulfonate terpolymer.

[0088] A kind of lithium sulfonate terpolymer provided by the present embodiment is to comprise:

[0089] Polyvinylidene fluoride structural unit (A) composed of x molar parts of vinylidene fluoride monomer, vinylbenzyl structural unit (B) composed of y molar parts of vinylbenzyl monomer and z molar parts of perfluorovinyl ether sulfonate Perfluorovinyl ether sulfonate lithium structural unit (C) three compound structural units composed of lithium acid lithium monomer; and

[0090] The copolymer has the following general structural formula:

[0091]

[0092] in:

[0093] Among the vinylbenzyl structural units, which:

[0094] R 1 -H, -Br, -Cl, -CF 3 、-CH 3 ;

[0095] R 2 -H, -Br, -C=O, -CH 3 ,-O-CH 3 ;

[0096] R 3 -H, -Br, -CH 2 Br, -COOH, -Ph, -CH 3 ,-O-CH 3 ;

[0097] In the lithium perfluorovinyl ether sulfonate structural unit, which:

[0098] m is an integer from 0 to 10, and n is an in...

Embodiment 2

[0117] This embodiment provides a preparation method of lithium sulfonate terpolymer.

[0118] A kind of preparation method of lithium sulfonate terpolymer provided by the present embodiment comprises the following steps:

[0119] In the reaction device, vinylidene fluoride monomer, vinylbenzyl monomer and Perfluorovinyl ether sulfonate lithium monomer and initiator are copolymerized into the lithium sulfonate terpolymer by a polymerization reaction method, and the reaction formula is:

[0120]

[0121] Further, in the above preparation method:

[0122] The reaction device adopts a high-pressure reactor;

[0123] The steps of adding vinylidene fluoride monomer, vinylbenzyl monomer, perfluorovinyl ether sulfonate lithium monomer and initiator respectively include:

[0124] In the high-pressure reactor, first add vinylbenzyl monomer, perfluorovinyl ether sulfonate lithium monomer and initiator, repeatedly evacuate to remove oxygen, and then fill vinylidene fluoride monomer...

example 1

[0153] In a high-pressure reactor with a tolerance of 10MPa, add the structural formula CH 2 =CH-C 6 h 5 The vinyl benzyl monomer, and the structural formula is Lithium perfluorovinyl ether sulfonate monomer and benzoyl peroxide initiator, repeatedly evacuated to remove oxygen, and then filled with structural formula CH under nitrogen atmosphere 2 = CF 2 Vinylidene fluoride gas;

[0154] in:

[0155] The structural formula is CH 2 = CF 2 The polyvinylidene fluoride structural unit composed of vinylidene fluoride gas has a structural formula of CH 2 =CH-C 6 h 5 Vinylbenzyl structural units composed of vinylbenzyl monomers, and the structural formula is F 2 C=CF-OCF 2 (CF 3 ) CF-SO 3 Li + The mole fraction ratio of the three perfluorovinyl ether sulfonate lithium structural units formed by the perfluorovinyl ether sulfonate lithium monomer is:

[0156] Vinylidene fluoride structural unit: vinylbenzyl structural unit: perfluorovinyl ether sulfonate lithium structu...

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Abstract

The invention discloses a lithium sulfonate terpolymer and a preparation method thereof. The lithium sulfonate terpolymer comprises a polyvinylidene fluoride structural unit, a vinyl benzyl structuralunit and a perfluorovinyl ether lithium sulfonate structural unit, the preparation method comprises the following steps: respectively adding a vinylidene fluoride monomer, a vinyl benzyl monomer, a perfluorovinyl ether lithium sulfonate monomer and an initiator into a reaction device, and carrying out one-step copolymerization by virtue of a polymerization reaction method. According to the invention, the advantage structure of polyvinylidene fluoride is retained, enough mechanical strength and thermal stability of the copolymer are ensured, the defects of the existing PVDF as a polymer lithium ion battery material are overcome by introducing a lithium ion high-efficiency transmission structural unit, a polar group and a large number of super-stable structural units, the transmission efficiency of lithium ions is optimized, and the battery performance is improved. The ionic conductivity of the lithium battery is improved, the polarization of the battery in the charging process is reduced, the charging and discharging performance of the battery is improved, and a new material and a new method are provided for further development and application of the lithium battery.

Description

technical field [0001] The invention relates to a lithium ion polymer and a preparation method thereof, in particular to a lithium sulfonate terpolymer and a preparation method thereof, and belongs to the technical field of lithium ion polymer battery production and manufacture. Background technique [0002] Polymer lithium-ion battery has the characteristics of small size, light weight, high energy density, small self-discharge, no memory effect, good safety performance, and can be made into any shape. It has become the most advanced rechargeable battery today. At present, the world's main technology Powerful countries are conducting vigorous research and development. [0003] Lithium polymer batteries are mainly composed of positive electrodes, negative electrodes, and separator paper. In currently developed lithium polymer batteries, polymer materials are mainly used in positive electrodes and electrolytes. [0004] Polyvinylidene fluoride (English abbreviation: PVDF) is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F216/14C08F212/12C08F212/14C08F212/08H01M10/0525H01M10/0565
CPCC08F214/222H01M10/0525H01M10/0565H01M2300/0025C08F216/1475C08F212/12C08F212/21C08F212/18C08F212/20C08F212/08Y02E60/10
Inventor 景浩
Owner JINCHUANGJING NEW MATERIAL TECH SHANGHAI
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