Vinylidene fluoride copolymer and preparation method thereof

A technology of vinylidene fluoride and copolymer, which is applied in the field of vinylidene fluoride-vinyl alcohol-perfluorovinyl ether sulfonate lithium terpolymer and its preparation field, which can solve the problem of poor compatibility and ion transmission efficiency of blended PVDF Low-level problems, to achieve the effect of optimizing lithium ion transmission efficiency, optimizing ion transmission efficiency, and improving chemical stability

Pending Publication Date: 2021-02-02
氟金(上海)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of low ion transmission efficiency and poor compatibility of blended PVDF at the service temperature of existing PVDF, and

Method used

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  • Vinylidene fluoride copolymer and preparation method thereof
  • Vinylidene fluoride copolymer and preparation method thereof
  • Vinylidene fluoride copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A preparation method of vinylidene fluoride copolymer, the steps are as follows:

[0054] (1) Add vinyl acetate (vinyl ester monomer), perfluorovinyl ether sulfonate lithium monomer and copolymerization initiator benzoyl peroxide into a high-pressure closed reactor (withstand pressure 10MPa), vacuumize and fill with nitrogen , the structure of lithium perfluorovinyl ether sulfonate monomer is:

[0055]

[0056] (2) Under the protection of nitrogen, the vinylidene fluoride monomer CH 2 = CF 2 , keep the pressure at 1.5MPa, slowly raise the temperature to 100°C for 24 hours, and stir the reactants during the whole reaction process, wherein the molar ratio of perfluorovinyl ether sulfonate lithium monomer, vinyl ester monomer and vinylidene fluoride monomer is 1:0.15:0.20;

[0057] (3) be cooled to room temperature, open the high-pressure airtight reactor and emit unreacted gas to obtain the terpolymer emulsion;

[0058] (4) After the terpolymer emulsion is demulsif...

Embodiment 2

[0060] A preparation method of a vinylidene fluoride copolymer, which is basically the same as in Example 1, except that the vinyl ester monomer is vinyl benzoate, perfluorovinyl ether sulfonate lithium monomer, vinyl ester monomer and vinylidene fluoride The molar ratio of ethylene monomer is 1:0.15:0.25.

Embodiment 3

[0062] A preparation method of vinylidene fluoride copolymer, which is basically the same as Example 1, except that the molar ratio of perfluorovinyl ether sulfonate lithium monomer, vinyl ester monomer and vinylidene fluoride monomer is 1:0.15 :0.30.

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Abstract

The invention discloses a vinylidene fluoride copolymer and a preparation method thereof, wherein the molecular structural formula of the vinylidene fluoride copolymer is defined in the specification,and in the formula, the unit A is a vinylidene fluoride structural unit, the unit B is a vinyl alcohol structural unit, the C unit is a perfluorovinyl ether lithium sulfonate structural unit, m is aninteger from 0 to 10, and n is an integer from 1 to 6. The preparation method comprises the following steps: copolymerizing a vinylidene fluoride monomer, a vinyl ester monomer and a perfluorovinyl ether lithium sulfonate monomer by a one-step method, and adding alkali for hydrolysis to obtain the vinylidene fluoride copolymer. The preparation method disclosed by the invention is simple in process and low in cost, and provides a new technical thought for PVDF modification; and the prepared vinylidene fluoride copolymer has high ion transmission efficiency, does not have the defect of poor compatibility of blended PVDF, and has great application prospects.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a vinylidene fluoride copolymer and a preparation method thereof, in particular to a vinylidene fluoride-vinyl alcohol-perfluorovinyl ether sulfonate lithium terpolymer and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is a homopolymer of vinylidene fluoride (VDF), with a fluorine content of 59%, and the repeating unit of its molecular chain is -CH 2 -CF 2 - The alternate arrangement of groups, this special molecular structure determines that PVDF fluororesin has the characteristics of both fluorine-containing resin and general-purpose resin, and has good chemical stability, good thermal stability, and excellent electrochemical performance. It is widely used as Lithium battery materials Cathode material, binder, negative electrode material and battery separator. However, the lithium battery is accompanied by the cyclic interc...

Claims

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Application Information

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IPC IPC(8): C08F216/14C08F218/08C08F214/22
CPCC08F216/1475C08F218/08C08F214/222
Inventor 景浩
Owner 氟金(上海)新材料有限公司
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