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Lithium sulfonate-containing ionic copolymer and preparation method thereof

An ionic copolymer and lithium sulfonate-containing technology are applied in the fields of lithium sulfonic acid-containing copolymer and its preparation, lithium ion polymer and its preparation to reduce polarization, improve charge-discharge performance, and avoid the use of emulsifiers Effect

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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  • Lithium sulfonate-containing ionic copolymer and preparation method thereof
  • Lithium sulfonate-containing ionic copolymer and preparation method thereof
  • Lithium sulfonate-containing ionic copolymer and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0081] This embodiment provides a lithium ion copolymer containing sulfonate.

[0082] A kind of sulfonate-containing lithium ion copolymer provided by the present embodiment comprises:

[0083] Polyvinylidene fluoride structural unit (A) composed of x molar parts of vinylidene fluoride monomer, acrylate structural unit (B) composed of y molar parts of acrylate monomer and z molar parts of perfluorovinyl ether sulfonate lithium monomer The perfluorovinyl ether sulfonate lithium structural unit (C) is a copolymer composed of three compound structural units; and

[0084] The copolymer has the following general structural formula:

[0085]

[0086] in:

[0087] In the acrylate structural unit, it:

[0088] R is H or CH 3 ;

[0089] In the perfluorovinyl ether sulfonate lithium structural unit, it:

[0090] n is an integer from 0 to 5, and p is an integer from 1 to 8;

[0091] The respective mole fractions of the polyvinylidene fluoride structural unit, the acrylate stru...

Embodiment 2

[0103] This embodiment provides a preparation method of a lithium ion copolymer containing sulfonate.

[0104] A kind of preparation method that present embodiment provides lithium ion copolymer containing sulfonic acid, comprises the steps:

[0105] In the reaction device, vinylidene fluoride monomers, acrylate monomers and perfluorovinyl groups were added according to the respective molar fractions of polyvinylidene fluoride structural units, acrylate structural units and lithium perfluorovinyl ether sulfonate structural units. Lithium ether sulfonate monomer and initiator are copolymerized into the lithium sulfonate-containing copolymer by means of a polymerization reaction, and the reaction formula is:

[0106]

[0107] Further, in the above preparation method:

[0108] The reaction device is an autoclave;

[0109] The steps of adding vinylidene fluoride monomer, acrylate monomer, perfluorovinyl ether sulfonate lithium monomer and initiator respectively include:

[0...

example 1

[0138] In a high-pressure reactor with a tolerance of 10MPa, add the structural formula CH 2 =CH-COO(CH 2 ) 2 -CH 3 acrylate monomers,

[0139] and the structure 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;

[0140] in:

[0141] The structural formula is CH 2 = CF 2 The polyvinylidene fluoride structural unit composed of vinylidene fluoride gas has a structural formula of CH 2 =CH-COO(CH 2 ) 2 -CH 3 The acrylate structural unit composed of acrylate monomers, and the structural formula is The mole fraction ratio of the three perfluorovinyl ether sulfonate lithium structural units formed by the perfluorovinyl ether sulfonate lithium monomer is:

[0142] Vinylidene fluoride structural unit: acrylate structural unit: lithium perfluorovinyl ether sulfonate structural unit = 0.55: 0.05: 0.20...

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Abstract

The invention discloses a lithium sulfonate-containing ionic copolymer and a preparation method thereof. The lithium sulfonate-containing ionic copolymer comprises x mole parts of a polyvinylidene fluoride structural unit (A) composed of vinylidene fluoride monomers, y mole parts of an acrylate structural unit (B) composed of acrylate monomers and z mole parts of a perfluorovinyl ether lithium sulfonate structural unit (C) composed of perfluorovinyl ether lithium sulfonate monomers. The copolymer composed of the three compound structural units retains the advantage structure of polyvinylidenefluoride, so enough mechanical strength and thermal stability of the copolymer are ensured; by introducing a lithium ion high-efficiency transmission structural unit, a polar group and a large numberof super-stable structural units, the defects of the existing PVDF used as a polymer lithium ion battery material are overcome, the transmission efficiency of lithium ions is optimized, the ionic conductivity of a lithium battery is improved, the polarization of the battery in the charging process is reduced, and the charging and discharging performance of the battery is improved; 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 sulfonic acid-containing lithium ion copolymer and a preparation method thereof, and belongs 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 (English abbr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F216/14C08F220/18
CPCC08F214/222C08F214/225C08F220/1803C08F216/1475C08F220/1805
Inventor 景浩
Owner 氟金(上海)新材料有限公司
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