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Hydrophilic lithium sulfonate terpolymer and preparation method thereof

A terpolymer and lithium sulfonate technology are applied in the fields of hydrophilic lithium sulfonate terpolymer and its preparation, lithium ion polymer and its preparation, and can solve the problems of low chemical stability and low performance of the copolymer, and the like, Achieve the effect of improving charge and discharge performance, improving chemical stability, and reducing polarization

Active Publication Date: 2021-01-29
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, a large number of carbon-hydrogen bonds (C-H) are introduced during the copolymerization process, and its stability is not as high as the carbon-fluorine bond (C-F) in the PVDF structure. The chemical stability of the copolymer obtained in this way is lower than that of the original PVDF homopolymer. performance

Method used

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  • Hydrophilic lithium sulfonate terpolymer and preparation method thereof
  • Hydrophilic lithium sulfonate terpolymer and preparation method thereof
  • Hydrophilic lithium sulfonate terpolymer and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0077] This embodiment provides a hydrophilic lithium sulfonate terpolymer.

[0078] It should be noted:

[0079] The monomer compounds involved in this example are all commercially available.

[0080] A kind of hydrophilic lithium sulfonate terpolymer provided by the present embodiment comprises:

[0081] Polyvinylidene fluoride structural unit (A) composed of x molar parts of vinylidene fluoride monomer, vinylpyrrolidone structural unit (B) composed of y molar parts of vinylpyrrolidone monomer and z molar parts of lithium perfluorovinyl ether sulfonate The perfluorovinyl ether sulfonate lithium structural unit (C) three kinds of compound structural units of the copolymer formed;

[0082] And the copolymer has the following general structural formula:

[0083]

[0084] in:

[0085] The respective mole fractions of polyvinylidene fluoride structural unit, vinylpyrrolidone structural unit and perfluorovinyl ether sulfonate lithium structural unit are respectively:

[00...

Embodiment 2

[0101] This embodiment provides a preparation method of a hydrophilic lithium sulfonate terpolymer.

[0102] It should be noted:

[0103] The reaction device, monomer compound, initiator, emulsifier, demulsifier, and organic solvent involved in this example are all commercially available.

[0104] A preparation method of hydrophilic lithium sulfonate terpolymer, comprising the steps of:

[0105] In the reaction device, vinylidene fluoride monomer, vinylpyrrolidone monomer, lithium perfluorovinyl ether sulfonate and initiator are respectively added, and the hydrophilic lithium sulfonate terpolymer is produced by copolymerization by polymerization reaction method;

[0106] Its reaction formula is:

[0107]

[0108] Further, in the above preparation method:

[0109] The reaction device is a high-pressure reactor;

[0110]The steps of adding vinylidene fluoride monomer, vinylpyrrolidone monomer, lithium perfluorovinyl ether sulfonate and initiator respectively include:

[...

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Abstract

The invention discloses a hydrophilic lithium sulfonate terpolymer and a preparation method thereof. The hydrophilic lithium sulfonate terpolymer is a copolymer containing a polyvinylidene fluoride structural unit composed of vinylidene fluoride monomers, a vinyl pyrrolidone structural unit composed of vinyl pyrrolidone monomers and a perfluorovinyl ether lithium sulfonate structural unit. The preparation method comprises the following steps: respectively adding a vinylidene fluoride monomer, a vinyl pyrrolidone monomer, lithium perfluorovinyl ether sulfonate and an initiator into a reaction device, and carrying out one-step copolymerization by adopting a polymerization reaction method. According to the invention, the structural advantages of polyvinylidene fluoride are retained, the existing defects are overcome, and the chemical stability is improved; by introducing the ion efficient transmission structure unit, the transmission efficiency of lithium ions is optimized, the ionic conductivity of the lithium battery is improved, the polarization of the battery in the charging process can be reduced, and the charging and discharging performance is improved; hydrophilic groups are introduced to improve hydrophilicity, so that the adsorption capacity of the electrolyte and the migration rate of lithium ions are improved.

Description

technical field [0001] The invention relates to a lithium ion polymer and a preparation method thereof, in particular to a hydrophilic lithium sulfonate terpolymer and a preparation method thereof, and belongs to the technical field of lithium ion polymer battery production and manufacture. Background technique [0002] Lithium polymer battery is the most advanced rechargeable battery today. At present, major scientific and technological powers in the world are conducting vigorous research and development. [0003] Polymer lithium-ion batteries have 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. At the same time, because the electrolyte of existing lithium-ion rechargeable batteries is relatively Many, high flammability, difficult to guarantee safety, and lithium-ion polymer rechargeable batteries use porous polymer materials as electrolytes, reducing the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F226/10C08F216/14
CPCC08F214/222C08F226/10C08F216/1475
Inventor 景浩
Owner 氟金(上海)新材料有限公司
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