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Vinylidene fluoride terpolymer and preparation method thereof

A vinylidene fluoride terpolymer, vinylidene fluoride technology, applied in electrical components, circuits, battery electrodes, etc., can solve the problems of low ion transmission efficiency, poor compatibility of blended PVDF, etc., and achieve the effect of reducing costs

Active 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 provide a PVDF composite material with good compatibility and high ion transmission efficiency

Method used

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  • Vinylidene fluoride terpolymer and preparation method thereof
  • Vinylidene fluoride terpolymer and preparation method thereof
  • Vinylidene fluoride terpolymer and preparation method thereof

Examples

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Embodiment 1

[0048] A preparation method of vinylidene fluoride terpolymer, the steps are as follows:

[0049] (1) Add vinyl acetate (vinyl ester monomer), vinyl lithium carbonate monomer CH 2 =CH-CH 2 -COOLi + and copolymerization initiator benzoyl peroxide and vacuumize and charge nitrogen;

[0050] (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 vinyl lithium carbonate monomer, vinyl ester monomer and vinylidene fluoride monomer is 1:0.15 :0.20;

[0051] (3) be cooled to room temperature, open the high-pressure airtight reactor and emit unreacted gas to obtain the terpolymer emulsion;

[0052] (4) After the terpolymer emulsion is demulsified by the ethanol solution, it is washed several times to remove the emulsifier and unreacted monomers, dried and dissolved in the alcohol solutio...

Embodiment 2

[0054] A preparation method of vinylidene fluoride terpolymer, which is basically the same as Example 1, except that the vinyl ester monomer is vinyl benzoate, vinyl lithium carbonate monomer, vinyl ester monomer and vinylidene fluoride monomer The molar ratio of the body is 1:0.15:0.25.

Embodiment 3

[0056] A preparation method of vinylidene fluoride terpolymer, which is basically the same as Example 1, except that the molar ratio of vinyl lithium carbonate 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 terpolymer and a preparation method thereof, wherein the molecular structural formula of the vinylidene fluoride terpolymer 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 unit C is a vinyl lithium carbonate structural unit, and n is greater than or equal to 1. The preparation method comprises the following steps: copolymerizing a vinylidene fluoride monomer, a vinyl ester monomer and a vinyl lithium carbonate monomer by a one-step method, and adding alkali for hydrolysis to obtain the vinylidene fluoride terpolymer. 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 terpolymer 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 novel lithium battery material and a preparation method thereof, in particular to a vinylidene fluoride-vinyl alcohol-vinyl lithium carbonate terpolymer and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is a homopolymer of vinylidene fluoride (VDF), and the repeating unit of its molecular chain is -CH 2 -CF 2 - Alternate arrangement of groups, with good chemical stability, good thermal stability, excellent electrochemical performance is widely used as lithium battery material positive electrode material, negative electrode material and battery separator. The migration process of lithium ions has an important impact on the working efficiency of lithium batteries. The positive and negative electrodes of the battery are made of polymer materials with good lithium intercalation and extraction cycle performance. Therefore, highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F220/04C08F218/08C08F8/12C08F218/10C08F2/22C08F218/00H01M4/62
CPCC08F2/22C08F8/12C08F214/225C08F220/04C08F218/24H01M4/623H01M4/624C08F218/08C08F218/10Y02E60/10
Inventor 景浩
Owner 氟金(上海)新材料有限公司
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