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Polyvinylidene fluoride-based terpolymer and preparation method thereof

A technology of polyvinylidene fluoride and terpolymer, applied in the field of lithium ion polymer and its preparation, based on polyvinylidene fluoride terpolymer and its preparation, to increase adsorption capacity, reduce polarization, improve chemical The effect of stability

Active Publication Date: 2021-03-16
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

[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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  • Polyvinylidene fluoride-based terpolymer and preparation method thereof
  • Polyvinylidene fluoride-based terpolymer and preparation method thereof
  • Polyvinylidene fluoride-based terpolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] This embodiment provides a terpolymer based on polyvinylidene fluoride.

[0084] A kind of terpolymer based on polyvinylidene fluoride provided in this embodiment is to comprise:

[0085] Polyvinylidene fluoride structural unit (A) composed of x molar parts of vinylidene fluoride monomer, acrylamide structural unit (B) composed of y molar parts of acrylamide monomer and z molar parts of lithium perfluorovinyl ether sulfonate Perfluorovinyl ether sulfonate lithium structural unit (C) composed of monomers is a copolymer composed of three compound structural units; and

[0086] The copolymer has the following general structural formula:

[0087]

[0088] in:

[0089] In the acrylamide structural unit, it:

[0090] R is -H, -CH 3 、-CH(CH 3 ) 2 、-CH 2 CH 3 ,-(CH 2 ) 3 -OCH 3 、-CH 2 -OH, -(CH 2 ) 11 -CH 3 , -(CH 2 ) 3 -N(CH 3 ) 2 、-C(CH 3 ) 3 、-CH(CH 3 ) 2 、-CH 2 C 6 h 5 、-C 6 h 5 any of the

[0091] In the perfluorovinyl ether sulfonate lithiu...

Embodiment 2

[0107] This example provides a method for preparing a polyvinylidene fluoride-based terpolymer.

[0108] A kind of preparation method based on polyvinylidene fluoride terpolymer provided by the present embodiment comprises the following steps:

[0109] In the reaction device, add vinylidene fluoride monomer, acrylamide monomer and perfluoro Lithium vinyl ether sulfonate monomer and initiator are copolymerized by a polymerization reaction method to form the polyvinylidene fluoride-based terpolymer, and its reaction formula is:

[0110]

[0111] Further, in the above preparation method:

[0112] The reaction device is an autoclave;

[0113] In the step of adding vinylidene fluoride monomer, acrylamide monomer and perfluorovinyl ether sulfonate lithium monomer and initiator respectively, specifically include:

[0114] In the high-pressure reactor, first add acrylamide monomer, perfluorovinyl ether sulfonate lithium monomer and initiator, repeatedly evacuate to remove oxygen...

example 1

[0141] In a high-pressure reactor with a tolerance of 10MPa, add the structural formula CH 2 =CH-CONH 2 The acrylamide monomer, 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;

[0142] in:

[0143] 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-CONH 2 The acrylamide structural unit composed of the acrylamide monomer, and the structural formula is F 2 C=CF-OCF 2 CF(CF 3 )-OCF 2 CF 2 -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:

[0144] Vinylidene fluoride structural unit: acrylamide structural unit: perfluorovinyl ether sulfonate lithi...

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Abstract

The invention relates to a polyvinylidene fluoride-based terpolymer and a preparation method thereof. The polyvinylidene fluoride-based terpolymer comprises a polyvinylidene fluoride structural unit,an acrylamide structural unit and a perfluorovinyl ether lithium sulfonate structural unit, the preparation method comprises the following steps: respectively adding a vinylidene fluoride monomer, anacrylamide monomer, a perfluorovinyl ether lithium sulfonate monomer and an initiator into a reaction device, and carrying out one-step copolymerization by virtue of a polymerization reaction method.According to the invention, the advantage structure of polyvinylidene fluoride is retained, enough mechanical strength and thermal stability of the copolymer are ensured, the defects of the existing PVDF as a polymer lithium ion battery material are overcome by introducing a lithium ion high-efficiency transmission structural unit, a polar group and a large number of super-stable structural units,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 is reduced, 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 polyvinylidene fluoride-based terpolymer 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 (English abbreviation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F220/56C08F216/14C08F220/54H01M10/0525H01M10/0565
CPCC08F214/227H01M10/0565H01M10/0525C08F220/56C08F216/1475C08F220/54Y02E60/10
Inventor 景浩
Owner 氟金(上海)新材料有限公司
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