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Self-supporting lithium ion battery gel polymer electrolyte and preparation method thereof

A lithium-ion battery, gel polymer technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of unsatisfactory electrochemical stability window, unsatisfactory ionic conductivity, and narrow applicable temperature range. Excellent liquid absorption and liquid holding capacity, good electrochemical stability, high production efficiency

Active Publication Date: 2009-04-15
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these matrices have some defects due to the use of the same monomer for polymerization: poor mechanical properties when the ionic conductivity is high, and low ionic conductivity when the mechanical strength is high
[0003] The Chinese invention patent with the application number 200710025612.6 discloses "a method for preparing a semi-interpenetrating network gel polymer electrolyte film", but the electrochemical stability window is still not ideal, only 4.6V (vs.Li / Li + ), the applicable temperature range is also narrow
The Chinese invention patent with the application number 200610043125.8 discloses "a method for preparing nano-silica / polymethyl methacrylate gel polymer electrolyte by one-step polymerization initiation". Although the mechanical strength is relatively ideal, the ionic conductivity is still not ideal. The highest is only 3.44×10 -4 S cm -1

Method used

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  • Self-supporting lithium ion battery gel polymer electrolyte and preparation method thereof
  • Self-supporting lithium ion battery gel polymer electrolyte and preparation method thereof
  • Self-supporting lithium ion battery gel polymer electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Polymer electrolyte without added nanoparticles:

[0032] (1) The monomers n-butyl methacrylate (BMA) and styrene (St) used in the polymerization are both analytically pure. Before the experiment, the monomers are distilled to remove the polymerization inhibitor hydroquinone. The following other examples all performed this treatment on the monomer before the reaction.

[0033] In N 2 Under the protection of the atmosphere, add 1.5 parts by mass of emulsifier sodium lauryl sulfate into 64.7 parts by mass of deionized water to dissolve, stir for 0.5 hours and add 33.5 parts by mass of monomer BMA and St (wherein the mass ratio of BMA and St is 1:1), while raising the temperature to 58°C. After reacting for 0.5 hours, add 0.3 parts of sodium persulfate (dissolved in 40ml of deionized water) with a constant pressure funnel, and control the titration speed, which is preferably 1~2s / drop. At the same time, adjust the speed of the stirrer. It is 500r / min. After 9 hours of reaction...

Embodiment 2

[0038]Polymer electrolyte without added nanoparticles:

[0039] (1) Under the protection of Ar atmosphere, add 1.3 parts by mass of emulsifier potassium lauryl sulfate to 63 parts by mass of deionized water to dissolve, and after stirring for 0.5 hours, add 35.3 parts by mass in sequence Parts of the monomers BMA and St (wherein the mass ratio of BMA and St is 2:1), while raising the temperature to 60°C. After 1 hour of reaction, use a constant pressure funnel to add 0.4 parts by mass of the initiator potassium persulfate (dissolved in 50ml of deionized water), and control the titration rate. It is advisable to use 1~2s / drop. The speed is set to 550r / min. After 7 hours of reaction, an egg white emulsion is obtained, and the egg white emulsion is poured into 1.5 times the above reaction volume, Al 2 (SO 4 ) 3 Stir and demulsify in a solution of 4 parts by mass, then wash 5 times with deionized water at 60°C and 10 times with deionized water at room temperature to obtain a white pol...

Embodiment 3

[0043] (1) In N 2 Under atmosphere protection, add 2 parts by mass of emulsifier sodium lauryl sulfate to 64.7 parts by mass of deionized water to dissolve, stir for 0.5 hours and add 32 parts by mass of monomer BMA and St (wherein the mass ratio of BMA and St is 1:1), while raising the temperature to 58°C. After reacting for 0.5 hours, add 0.3 parts of sodium persulfate (dissolved in 40ml of deionized water) with a constant pressure funnel, and control the titration speed, which is preferably 1~2s / drop. At the same time, adjust the speed of the stirrer. It is 500r / min. After 9 hours of reaction, an egg white emulsion is obtained, and the egg white emulsion is poured into 1 times the above reaction volume, Al 2 (SO 4 ) 3 Stir and demulsify the solution with 3 parts by mass, then wash 4 times with deionized water at a temperature of 58°C and 8 times with deionized water at room temperature to obtain a white polymer; place the obtained white polymer in a vacuum drying oven Dry at 55...

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Abstract

The invention discloses a self-supported lithium ion battery gel polymer electrolyte and a preparation method thereof. In the invention, at first, a multi-polymer is obtained by polymerizing the latexes of a methacrylic acid N-Butyl Acetate monomer and a styrene monomer of different proportions; then under the condition of ultrasonic, 10 to 30 minutes after a certain amount of nanometer particles are dispersed in a tetrahydrofuran solvent, the powder of the polymer is dissolved into the liquor to obtain ropy gel; a self-supported lithium ion battery gel polymer membrane is obtained by a phase transfer method; the membrane is dipped into the electrolyte, thus obtaining the gel polymer electrolyte. The gel polymer electrolyte is good in thermal stability, has a high decomposition temperature, is simple in preparation technique and is suitable for the industrial production of the lithium ions of the polymer, with the raw materials easily gotten.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a self-supporting gel polymer electrolyte for lithium ion batteries and a preparation method thereof. Background technique [0002] A new type of lithium ion battery developed on the basis of liquid lithium ion battery-gel polymer lithium ion battery, due to the use of polymer matrix, the liquid organic solvent is directly converted into gel state, which has high safety performance and circulation Good performance, long storage life, wide operating temperature range, large specific energy and no memory effect. As the core part of gel polymer lithium ion batteries-the research of gel polymer electrolyte (GPE) has attracted attention at home and abroad. So far, many polymers used as GPE matrix have been reported, such as polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), polymethylmethacrylate (PMMA), polyethylene oxide (PEO), polychloride Vinyl (PVC) etc. However, due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/40C08J5/18C08L33/10C08K3/36C08K3/22C08K3/24C08K3/34C08F220/18
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 廖友好饶睦敏李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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