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Polyelectrolyte material applicable to lithium battery and preparation method of polyelectrolyte material

A technology of polyelectrolyte and lithium battery, applied in lithium battery, non-aqueous electrolyte battery, secondary battery, etc., to avoid chemical degradation, improve charge and discharge performance, and reduce polarization

Active Publication Date: 2021-01-12
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 applicable to lithium battery and preparation method of polyelectrolyte material
  • Polyelectrolyte material applicable to lithium battery and preparation method of polyelectrolyte material
  • Polyelectrolyte material applicable to lithium battery and preparation method of polyelectrolyte material

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Embodiment 1

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

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

[0080] A polyvinylidene fluoride structural unit (A) composed of x molar parts of vinylidene fluoride monomer, a chlorotrifluoroethylene structural unit (B) composed of y molar parts of chlorotrifluoroethylene monomer, and z molar parts of perfluorovinyl ether sulfonate A polyelectrolyte 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 perfluorovinyl ether sulfonate lithium structural unit, it:

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

[0086] The respective mole fractions of the polyvinylidene fluoride structural unit,...

Embodiment 2

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

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

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

[0102]

[0103] Further, in the above preparation method:

[0104] The reaction device is an autoclave;

[0105] The steps of adding vinylidene fluoride monomer, chlorotrifluoroethylene monomer, perfluorovinyl ether sulfonate lithium monomer and initiator respectively include:

[0106] In the high-pressure reactor, first add chlorotrifluoroethylene monomer, perfluorovinyl ether sulfonate lithium mo...

example 1

[0134] In a high-pressure reactor with a tolerance of 10MPa, add the structural formula CF 2 = the chlorotrifluoroethylene monomer of CFCl, 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;

[0135] in:

[0136] The structural formula is CH 2 = CF 2 The polyvinylidene fluoride structural unit composed of vinylidene fluoride gas, the structural formula is CF 2 The chlorotrifluoroethylene structural unit that the chlorotrifluoroethylene monomer of =CFCl is formed, and be F by structural formula 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:

[0137] Vinylidene fluoride structural unit: chlorotrifluoroethylene structural unit: p...

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Abstract

The invention discloses a polyelectrolyte material applicable to a lithium battery and a preparation method of the polyelectrolyte material. The polyelectrolyte material comprises a polyvinylidene fluoride structural unit, a chlorotrifluoroethylene structural unit and a perfluorovinyl ether lithium sulfonate structural unit. The preparation method comprises the following steps: respectively addinga vinylidene fluoride monomer, a chlorotrifluoroethylene monomer, a perfluorovinyl ether lithium sulfonate monomer and an initiator into a reaction device, and carrying out one-step copolymerizationby virtue of a polymerization reaction method. According to the invention, the advantage structure of polyvinylidene fluoride is retained, so the sufficient mechanical strength and the sufficient thermal stability of the polyelectrolyte material are ensured; and an efficient lithium ion transmission structure unit, a polar group and a large number of the ultra-stable structure units are introducedso as to overcome the defects of the existing PVDF serving as a polymer lithium ion battery material, optimize lithium ion transmission efficiency, improve the ionic conductivity of the lithium battery, decrease the polarization of the battery in the charging process and enhance the charging and discharging performance of the battery; 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 polyelectrolyte 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] 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 (Eng...

Claims

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Application Information

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Patent Type & Authority Applications(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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