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Self-supporting lithium ionic cell gel polymer electrolyte, special polymer and preparation method and application thereof

A technology of lithium ion battery and gel polymer, which is applied in the field of lithium ion battery gel polymer electrolyte and its preparation, can solve the problems of unsatisfactory electrochemical stability window and the like, achieves good environmental protection effect and good electrochemical stability , the effect of short operation time

Active Publication Date: 2010-12-08
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ionic conductivity of the three published patents (applications) has just reached 10 -3 S cm -1 , the electrochemical stability window is still not ideal, the highest is only 4.8V (vs.Li / Li + )

Method used

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  • Self-supporting lithium ionic cell gel polymer electrolyte, special polymer and preparation method and application thereof
  • Self-supporting lithium ionic cell gel polymer electrolyte, special polymer and preparation method and application thereof
  • Self-supporting lithium ionic cell gel polymer electrolyte, special polymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) The monomer methyl methacrylate (MMA) used in the polymerization, acrylonitrile (AN) and vinyl acetate (VAc) are all analytically pure. The synthetic route of the polymer is as follows figure 1 shown. Before the experiment, the monomer was distilled to remove the inhibitor hydroquinone. The specific method of polymerization test is as follows: 2 Under the protection of the atmosphere, the emulsifier sodium lauryl sulfate that is 1.5% by mass percentage is added into the deionized water that is 65% by mass percentage for dissolving, then add the monomer MMA that is 33.3% by mass percentage, AN and VAc (MMA, AN and VAc mass ratio are 1: 4: 1), stir evenly, add the initiator sodium persulfate that is 0.2% mass percent with constant pressure funnel at 55 ℃ and react (adding in two times), stirring speed is controlled at 1000r / min; After 6 hours of reaction, a white emulsion is obtained, and the white emulsion is poured into 1 times the above reaction volume, and the ...

Embodiment 2

[0047] (1) Pretreatment monomer MMA, AN and VAc according to Example 1. The specific method of polymerization test is as follows: 2 Under the atmosphere protection, the emulsifier potassium lauryl sulfate that is 3% by mass is added to the deionized water that is 61.6% by mass to dissolve, then add the monomer MMA that is 35% by mass, AN and VAc (MMA, AN and VAc mass ratio are 2: 8: 1), stir evenly, add the initiator potassium persulfate that is 0.4% mass percent with constant pressure funnel under 60 ℃ and react (add in two times), stirring speed is controlled at 800r / min; After 7 hours of reaction, a white emulsion is obtained, and the white emulsion is poured into 1 times the above reaction volume, and the mass concentration is 3.5% Al 2 (SO 4 ) 3 Stir in the solution to break the emulsion, and then wash with deionized water at a temperature of 60°C for 3 times, and then with absolute ethanol for 3 times to remove any incompletely reacted monomer or emulsifier. The obta...

Embodiment 3

[0051] (1) Pretreatment monomer MMA, AN and VAc according to Example 1. The specific method of polymerization test is as follows: 2 Under the protection of the atmosphere, the emulsifier lauryl ammonium sulfate that is 1% by mass is added to 68.65% deionized water for dissolution, and then 30% by mass of monomers MMA, AN and VAc (MMA, AN and VAc mass ratio are 4: 8: 1), stir evenly, add the initiator ammonium persulfate that is 0.35% mass percent with constant pressure funnel under 60 ℃ and react (adding in two times), stirring speed is controlled at 800r / min; After 6.5 hours of reaction, a white emulsion is obtained, and the white emulsion is poured into 1.5 times the above reaction volume, and the mass concentration is 3.5% Al 2 (SO 4 ) 3 Stir in the solution to break the emulsion, then wash with deionized water at a temperature of 60°C for 4 times, and then wash with absolute ethanol for 4 times to remove any incompletely reacted monomer or emulsifier. The obtained whit...

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Abstract

The invention discloses a self-support lithium ion battery gel polymer electrolyte and a preparation method and application thereof. In the invention, firstly, by the emulsion polymerization of methyl methacrylate, acrylonitrile and vinylacetatemonomer, a terpolymer is obtained; polymer powder is dissolved into N-N dimethylformamide to obtain sticky gel which is coated on a glass plate, the gel is put in a sink to trigger the phase transition, and is further dried to obtain the self-support lithium ion battery gel polymer film; and a film is soaked in the electrolyte so as to obtain the gel polymer electrolyte. The ionic conductivity of the gel polymer electrolyte is as high as 3.48 x 10<-3>S.cm<-1> at the room temperature, the electrochemical stabilization window can reach 5.6V (vs.Li / Li< + >), and the transference number of lithium ions reaches 0.51. The electrolyte and the preparation method and application thereof have the advantages that the material is easily available, and the electrolyte and the preparation method and application thereof are suitably for the industrialized production of lithium ion polymers.

Description

technical field [0001] The invention belongs to the technical field of preparation of gel polymer electrolytes, in particular to a self-supporting lithium ion battery gel polymer electrolyte with polymer poly(methyl methacrylate-acrylonitrile-vinyl acetate) as a matrix and Its preparation method and application. Background technique [0002] Among all commercial rechargeable batteries, lithium-ion batteries have the advantages of the highest energy density, high working voltage, long cycle life, and low self-discharge, so they are more widely used than other rechargeable batteries. However, lithium-ion batteries face serious safety issues due to the use of liquid electrolytes containing flammable organic solvents. This problem can be solved by using a solid electrolyte (SPE) that does not contain any solvent molecules. However, the ionic conductivity of SPE at room temperature is only 1×10 -5 S cm -1 , about three orders of magnitude lower than commercial liquid electrol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/14C08F220/44C08F218/08C08J5/18C08L33/20H01M10/40H01M6/16
CPCY02E60/122Y02E60/10
Inventor 廖友好李伟善饶睦敏周代营
Owner SOUTH CHINA NORMAL UNIVERSITY