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Polyelectrolyte material for lithium battery application and preparation method thereof

A technology of polyelectrolyte and lithium battery, applied in lithium battery, non-aqueous electrolyte battery, secondary battery, etc., to achieve the effect of improving chemical stability, regulating ionic conductivity, and avoiding the use of emulsifiers

Active Publication Date: 2022-06-24
氟金(上海)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Polyelectrolyte material for lithium battery application and preparation method thereof
  • Polyelectrolyte material for lithium battery application and preparation method thereof
  • Polyelectrolyte material for lithium battery application and preparation method thereof

Examples

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Embodiment 1

[0078] This embodiment provides a polymer electrolyte material for lithium battery applications.

[0079] A polyelectrolyte material for lithium battery applications provided in this embodiment includes:

[0080] Polyvinylidene fluoride structural unit (A) composed of x mole parts of vinylidene fluoride monomer, chlorotrifluoroethylene structural unit (B) composed of y mole parts of chlorotrifluoroethylene monomer, and z mole parts of perfluorovinyl ether sulfonic acid A polymer electrolyte material composed of three compound structural units of perfluorovinyl ether sulfonate lithium structural unit (C) composed of lithium acid monomer; and

[0081] The polyelectrolyte material has the following general structural formula:

[0082]

[0083] in:

[0084] In the lithium perfluorovinyl ether sulfonate structural unit, it:

[0085] m is an integer from 0 to 10, and n is an integer from 0 to 6;

[0086] The respective molar fractions of the polyvinylidene fluoride structural...

Embodiment 2

[0099] This embodiment provides a method for preparing a polymer electrolyte material for lithium battery applications.

[0100] A method for preparing a polymer electrolyte material for lithium battery applications provided in this embodiment includes the following steps:

[0101] In the reaction device, vinylidene fluoride monomer, chlorotrifluoroethylene monomer and The lithium perfluorovinyl ether sulfonate monomer and the initiator are copolymerized by the polymerization reaction method to prepare the polyelectrolyte material for lithium battery applications, and the reaction formula is:

[0102]

[0103] Further, in the above-mentioned preparation method:

[0104] The reaction device is an autoclave;

[0105] The step of adding vinylidene fluoride monomer, chlorotrifluoroethylene monomer, perfluorovinyl ether sulfonate lithium monomer and initiator respectively, specifically includes:

[0106] In the autoclave, firstly add chlorotrifluoroethylene monomer, lithium p...

example 1

[0134] In an autoclave with a tolerance of 10MPa, add the structural formula of CF 2 The chlorotrifluoroethylene monomer of =CFCl, and the structural formula is The perfluorovinyl ether sulfonate lithium 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;

[0135] in:

[0136] by the structural formula CH 2 =CF 2 The polyvinylidene fluoride structural unit composed of the vinylidene fluoride gas, the structural formula is CF 2 The chlorotrifluoroethylene structural unit constituted by the chlorotrifluoroethylene monomer of =CFCl, and the structural unit of which the structural formula is F 2 C=CF-OCF 2 (CF 3 )CF-SO 3 Li + The molar fraction ratio of the three perfluorovinyl ether sulfonate lithium structural units composed of the perfluorovinyl ether sulfonate lithium monomer is:

[0137] Structural unit of vinylidene fluoride: Struc...

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Abstract

A polyelectrolyte material for lithium battery applications and a preparation method thereof, the polyelectrolyte material includes polyvinylidene fluoride structural units, chlorotrifluoroethylene structural units and perfluorovinyl ether sulfonate lithium structural units; the preparation method includes : In a reaction device, vinylidene fluoride monomer, chlorotrifluoroethylene monomer, perfluorovinyl ether sulfonate lithium monomer and initiator are respectively added, and the reaction method is used for one-step copolymerization. The invention retains the advantageous structure of polyvinylidene fluoride, ensures that the polyelectrolyte material has sufficient mechanical strength and thermal stability, and overcomes the existing problems by introducing efficient lithium ion transport structural units, polar groups and a large number of ultra-stable structural units. There are deficiencies in PVDF as a polymer lithium-ion battery material, which optimizes the transmission efficiency of lithium ions, improves the ionic conductivity of lithium batteries, reduces the polarization of the battery during charging, and improves the charge and discharge performance of the battery. It 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 polymer electrolyte material for lithium battery applications and a preparation method thereof, belonging to the technical field of lithium ion polymer battery production and manufacture. Background technique [0002] The 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 major 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 the currently developed lithium polymer batteries, polymer materials are mainly used in positive electrodes and electrolytes. [0004] Polymer materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/22C08F214/24C08F216/14H01M10/052H01M10/0565
CPCC08F214/222H01M10/052H01M10/0565C08F214/242C08F216/1475Y02E60/10
Inventor 景浩
Owner 氟金(上海)新材料有限公司
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