Preparation method of lithium ion battery gel polymer electrolyte

A gel polymer and lithium-ion battery technology, which is applied in the field of lithium-ion batteries, can solve the problems of low ion conductivity, poor mechanical properties, and unsatisfactory ion conductivity, so as to improve liquid absorption capacity and liquid retention capacity, Effect of improving ionic conductivity and mechanical properties, good ionic conductivity and electrochemical stability

Active Publication Date: 2013-11-27
ADVANCED ELECTRONICS ENERGY LIMITED GUANGDONG +1
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  • Abstract
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Problems solved by technology

However, there are inevitably some defects in the polymerization of the same monomer: when the ionic conductivity is high, the mechanical properties are not good, and when the mechanical strength is high, the ionic conductivity is low
For example, the invention patent with the application number 200610043125.8 discloses "the method for preparing nano-silica / polymethyl methacrylate gel polymer electrolyte by one-step polymerization initiation", although the gel polymer electrolyte made has a good space Stability and mechanical properties, but its ionic conductivity is still not ideal, the highest is only 3.44×10-4 S cm-1

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  • Preparation method of lithium ion battery gel polymer electrolyte
  • Preparation method of lithium ion battery gel polymer electrolyte
  • Preparation method of lithium ion battery gel polymer electrolyte

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preparation example Construction

[0034] A preparation method of a lithium ion battery gel polymer electrolyte, comprising the following steps: using methyl methacrylate, acrylonitrile and ethyl acrylate as functional monomers, and preparing polymer poly(methyl methacrylate) by emulsion polymerization -acrylonitrile-ethyl acrylate); dissolve the polymer in N-N dimethylformamide, add a pore-forming agent whose mass is 0-5% of N-N dimethylformamide, coat it on the support, and use phase transfer The method prepares a porous gel polymer film; immersing the gel polymer film in the lithium ion battery electrolyte to obtain the lithium ion battery gel polymer electrolyte.

[0035] Preferably, the mass ratio of methyl methacrylate, acrylonitrile and ethyl acrylate is (1-5):(1-5):1.

[0036] Preferably, the pore-forming agent is at least one of polyethylene glycol, polyvinylpyrrolidone, and urea. More preferably, the pore forming agent is polyethylene glycol 400 (PEG400).

[0037] Preferably, the support body is pol...

Embodiment 1

[0055] (1) in N 2 Under the atmosphere, add 1 mass part of potassium lauryl sulfate to 66.9 mass parts of deionized water to dissolve, add 32 mass parts of monomers MMA, AN and EA, MMA: AN: EA (mass ratio) = 1: 5:1, stir evenly, raise the temperature to 55°C, dissolve 0.1 parts by mass of potassium persulfate in 40 mL of deionized water, and add in several times within 0.5 hours of reaction at a speed of 1-2 s / drop with a syringe; 1000rpm continued to stir and react for 8 hours to obtain a white emulsion;

[0056] (2) Prepare an aluminum sulfate aqueous solution with a concentration of 2wt%, pour the emulsion into 1 times the volume of aluminum sulfate aqueous solution, stir to break the emulsion, wash with 55°C deionized water for 3 times, then wash with absolute ethanol for 3 times, and finally use Wash with deionized water 3 times to obtain a white polymer; then dry the white polymer under vacuum at 55°C for 24 hours to obtain poly(methyl methacrylate-acrylonitrile-ethyl a...

Embodiment 2

[0060] (1) in N 2 Under the atmosphere, add 1.5 parts by mass of sodium lauryl sulfate to 68.35 parts by mass of deionized water to dissolve, add 30 parts by mass of MMA, AN and EA, MMA: AN: EA (mass ratio) = 4:2: 1. Stir evenly, raise the temperature to 60°C, dissolve 0.15 parts by mass of sodium persulfate in 60 mL of deionized water, and add in several times within 0.5 hours of reaction at a rate of 1-2 s / drop with a syringe; 800 rpm continuously Stirred and reacted for 6 hours to obtain a white emulsion;

[0061] (2) Prepare an aluminum sulfate aqueous solution with a concentration of 3wt%, pour the emulsion into 1 times the volume of aluminum sulfate aqueous solution, stir to break the emulsion, wash with 60°C deionized water for 4 times, then wash with absolute ethanol for 4 times, and finally use Wash with deionized water 4 times to obtain a white polymer; then dry the white polymer at 60°C in vacuum for 24 hours to obtain poly(methyl methacrylate-acrylonitrile-ethyl a...

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Abstract

The invention discloses a preparation method of a lithium ion battery gel polymer electrolyte. The preparation method comprises following steps: poly(methyl methacrylate-acrylonitrile-ethyl acrylate) is prepared by taking methyl methacrylate, acrylonitrile and ethyl acrylate as functional monomers; an appropriate amount of a pore forming agent is added; lithium ion battery gel polymer films supported by different supports are prepared by phase-transfer method; and the lithium ion battery gel polymer films are immersed into an electrolyte so as to obtain the lithium ion battery gel polymer electrolyte. The lithium ion battery gel polymer films possess excellent mechanical properties, liquid absorption capability and liquid retention capability. The lithium ion batteries assembled by using the lithium ion battery gel polymer electrolyte possess high ionic conductivity and electrochemistry stability. Deionized water is used as a solvent in the preparation, and no volatile organic solvent is used, so that no pollution on the environment is caused, and protection cost is low.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a preparation method of a gel polymer electrolyte for lithium ion batteries. Background technique [0002] Polymer lithium-ion batteries are the latest generation of lithium-ion batteries developed on the basis of liquid lithium-ion batteries. Gel electrolyte is a gel polymer network with a suitable microporous structure formed by polymers, plasticizers and lithium salts through certain methods, and uses liquid electrolyte molecules fixed in the microstructure to achieve ion conduction. In addition to the characteristics of liquid lithium-ion batteries, polymer lithium-ion batteries also have the following advantages: (1) There is no free electrolyte, which effectively avoids the leakage of organic electrolytes; (2) It can effectively prevent the formation of dendritic lithium metal. It will be possible to use metal lithium as the negative electrode, thereby greatly improvin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 孙聘陈光森李伟善艾群糸井俊树张栋省吉冈诚刘震徐士民
Owner ADVANCED ELECTRONICS ENERGY LIMITED GUANGDONG
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