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Lithium carbonate terpolymer and preparation method thereof

A technology of lithium carbonate terpolymer and copolymer, applied in the field of lithium carbonate terpolymer and its preparation, lithium ion polymer and its preparation, can solve the problem of capacity deterioration, peeling of electrode adhesive layer, reduction of PVDF phase Capacitance and other problems to achieve the effect of increasing the adsorption capacity

Active Publication Date: 2022-06-24
JINCHUANGJING NEW MATERIAL TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, although the addition of a conductive agent can effectively improve the electrochemical performance of the material, it will reduce the compatibility of PVDF with other materials, weaken the bonding force of the polymer material itself and the durability of the bonding force, and cause the electrode adhesive The layer is easily peeled off partly or completely from the current collector, the load characteristics are deteriorated, and problems such as capacity degradation occur

Method used

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  • Lithium carbonate terpolymer and preparation method thereof
  • Lithium carbonate terpolymer and preparation method thereof
  • Lithium carbonate terpolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] This embodiment provides a lithium carbonate terpolymer.

[0085] A kind of lithium carbonate terpolymer provided by the present embodiment is to comprise:

[0086] Polyvinylidene fluoride structural unit (A) composed of x mole parts of vinylidene fluoride monomer, vinylbenzyl structural unit (B) composed of y mole parts of vinylbenzyl monomer, and z mole parts of vinyl-alkyl carbonate A copolymer of vinyl-alkyl lithium carbonate structural units (C) composed of three compound structural units composed of lithium monomers; and

[0087] The copolymer has the following general structural formula:

[0088]

[0089] in:

[0090] In the vinylbenzyl monomer, it:

[0091] R 1 For -H, -Br, -Cl, -CF 3 , -CH 3 ;

[0092] R 2 For -H, -Br, -C=O, -CH 3 , -O-CH 3 ;

[0093] R 3 For -H, -Br, -CH 2 Br, -COOH, -Ph, -CH 3 , -O-CH 3 ;

[0094] In the vinyl-alkyl lithium carbonate monomer: n is an integer greater than or equal to 1; and

[0095] The respective molar fra...

Embodiment 2

[0112] This embodiment provides a preparation method of a lithium carbonate terpolymer.

[0113] A preparation method of a lithium carbonate terpolymer provided by the present embodiment comprises the following steps:

[0114] In the reaction device, vinylidene fluoride monomer, vinylbenzyl monomer and ethylene were added according to the respective mole fractions of polyvinylidene fluoride structural unit, vinylbenzyl structural unit and vinyl-alkyl lithium carbonate structural unit. The base-alkyl lithium carbonate monomer and the initiator are copolymerized by the polymerization reaction method to make the lithium carbonate terpolymer, and its reaction formula is:

[0115]

[0116] Further, in the above-mentioned preparation method:

[0117] The reaction device adopts a high pressure reactor;

[0118] In the step of adding vinylidene fluoride monomer, vinylbenzyl monomer, vinyl-alkyl lithium carbonate monomer and initiator respectively, it specifically includes:

[01...

example 1

[0147] In an autoclave with a tolerance of 10MPa, the structural formula of CH is added. 2 =CH-C 6 H 5 of vinylbenzyl monomers, and the structural formula CH 2 =CH-C 2 H 4 -COOLi + The vinyl-alkyl lithium carbonate monomer and benzoyl peroxide initiator are repeatedly evacuated to remove oxygen, and then, under a nitrogen atmosphere, the structural formula is CH 2 =CF 2 of vinylidene fluoride gas;

[0148] in:

[0149] by the structural formula CH 2 =CF 2 The polyvinylidene fluoride structural unit composed of the vinylidene fluoride gas, the structural formula is CH 2 =CH-C 6 H 5 The vinylbenzyl structural unit of the vinylbenzyl monomer, and the structural formula CH 2 =CH-C 2 H 4 -COOLi + The molar fraction ratio of the vinyl-alkyl lithium carbonate structural units constituted by the vinyl-alkyl lithium carbonate monomer is:

[0150] Vinylidene fluoride structural unit: vinylbenzyl structural unit: vinyl-alkyl lithium carbonate structural unit=0.55:0.30:0....

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Abstract

A kind of lithium carbonate terpolymer and preparation method thereof, described lithium carbonate terpolymer has included polyvinylidene fluoride structural unit, vinylbenzyl structural unit and vinyl-alkyl lithium carbonate structural unit; Preparation method comprises : In a reaction device, vinylidene fluoride monomer, vinylbenzyl monomer, vinyl-alkyllithium carbonate monomer and initiator are respectively added, and one-step copolymerization is formed by a polymerization reaction method. The present invention retains the advantageous structure of polyvinylidene fluoride and ensures that the copolymer has sufficient mechanical strength and thermal stability. By introducing polar groups such as vinyl benzyl groups, a large number of ester bonds and carbonic acid bonds into the copolymer, It overcomes the shortcomings of the existing PVDF as a polymer lithium-ion battery material, optimizes the transmission efficiency of lithium ions, improves the ion conductivity of lithium batteries, reduces the polarization of the battery during charging, and improves the charging of the battery. The discharge performance provides new materials and methods for the further development and application of lithium batteries.

Description

technical field [0001] The invention relates to a lithium ion polymer and a preparation method thereof, in particular to a lithium carbonate terpolymer and a preparation method thereof, and belongs to the technical field of lithium ion polymer battery production and manufacture. Background technique [0002] Lithium-ion polymer battery is the most advanced rechargeable battery today. It 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. Science and technology powerhouses are conducting vigorous research and development. [0003] Lithium-ion polymer batteries are mainly composed of positive electrodes, negative electrodes, and separator paper. In the currently developed lithium-ion polymer batteries, polymer materials are mainly used in positive electrodes and electrolytes. [0004] The polymer material polyvinylidene fluoride (English abbreviation: PVDF) i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/22C08F212/08C08F212/12C08F212/14C08F218/00H01M10/0525H01M10/0565
CPCC08F214/225H01M10/0525H01M10/0565H01M2300/0025C08F212/12C08F218/00C08F212/08C08F212/21C08F212/18C08F212/20Y02E60/10
Inventor 景浩
Owner JINCHUANGJING NEW MATERIAL TECH SHANGHAI
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