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Method for polymerizing nano silicon dioxide/polymethyl methacrylate gel polymer electrolyte initiated by one-step method

A technology of polymethyl methacrylate gel and methyl methacrylate, which is applied in the interdisciplinary field of electricity and material science, can solve the problems of complex process, high viscosity of the system, environmental pollution, etc., and achieves simple process and improved stability. sexual effect

Inactive Publication Date: 2008-01-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are literature reports at home and abroad that SiO 2 Nanoparticles and PMMA are prepared by blending the gel polymer electrolyte. Usually, the blending method disperses the nanoparticles, which will make the viscosity of the system higher and the degree of dispersion of the nanoparticles will be lower. Some researchers also use other auxiliary solvents to reduce the viscosity of the system. However, more solvents need to be removed after fully mixed, which causes problems such as complex process and environmental pollution.

Method used

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  • Method for polymerizing nano silicon dioxide/polymethyl methacrylate gel polymer electrolyte initiated by one-step method
  • Method for polymerizing nano silicon dioxide/polymethyl methacrylate gel polymer electrolyte initiated by one-step method

Examples

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Effect test

Embodiment 1

[0025] 2.5g lithium perchlorate LiCiO 4 Dissolve in 27.5g propylene carbonate PC to make 1M·L -1 30g of organic solution; 20g methyl methacrylate, 0.05g azobisisobutyronitrile, 1.5g nano-SiO2, 30g organic electrolyte, fully mixed and stirred in an 80°C water bath for 2.5 hours, and poured the obtained colloidal electrolyte Form a thin film and dry it in a vacuum atmosphere at 60°C for 8 hours to obtain a silica / polymethyl methacrylate gel polymer electrolyte (1phr-SiO 2 / PMMA). And found that under this ratio, the silicon dioxide / polymethyl methacrylate (SiO 2 / PMMA) gel polymer electrolyte has good steric stability and mechanical properties, and well satisfies the requirement of ionic conductivity as an electrolyte for lithium-ion batteries.

Embodiment 2

[0027] 2.5g lithium perchlorate LiCiO 4 Dissolve in 27.5g propylene carbonate PC to make 1M·L -1 30g of organic solution; 20g methyl methacrylate, 0.05g dibenzoyl peroxide (BPO), 3g nano-SiO2, 30g organic electrolyte, fully mixed and stirred in an 80°C water bath for 2.5 hours to obtain colloidal electrolyte The solution was poured into a thin film, and dried in a vacuum atmosphere at 60°C for 8 hours to obtain a silica / polymethyl methacrylate gel polymer electrolyte (2phr-SiO 2 / PMMA). And found that under this ratio, the silicon dioxide / polymethyl methacrylate (SiO 2 / PMMA) gel polymer electrolyte has good steric stability and mechanical properties, and well satisfies the requirement of ionic conductivity as an electrolyte for lithium-ion batteries.

Embodiment 3

[0029] 2.5g lithium perchlorate LiCiO 4 Dissolve in 27.5g propylene carbonate PC to make 1M·L -1 30g of organic solution; 20g of methyl methacrylate, 0.05g of azobisisobutyronitrile, 5g of nano-SiO2, 30g of organic electrolyte, fully mixed and stirred in an 80°C water bath for 2.5 hours, and poured the obtained colloidal electrolyte into The film was dried under vacuum at 60°C for 8 hours to obtain a silica / polymethyl methacrylate gel polymer electrolyte (5phr-SiO 2 / PMMA). And found that under this ratio, the silicon dioxide / polymethyl methacrylate (SiO 2 / PMMA) gel polymer electrolyte has good steric stability and mechanical properties, and well meets the requirement of ionic conductivity as an electrolyte for lithium-ion batteries. The concrete properties of the gel electrolyte system that three kinds of embodiments obtain are as follows:

[0030]

[0031] ※All measured at 25℃

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Abstract

The invention relates to a one-step initiating polymerization method for preparing nano silica / polymethyl methacrylate gel polymer electrolyte, which is characterized in that: methyl methacrylate used as monomer and the nano silica used as modified particles are mixed directly with prepared lithium perchlorate / propylene carbonate (1mol / l of electrolyte solution used as solvent). The mixed solution is polymerized in water bath heating to 80 DEG C for 2.5 hours, and then reacted gel solution can form the gel electrolyte film after being poured onto a glass board and extending to become film with being dried for 8 hours in the temperature of 60 DEG C. The benefit effects of he invention are that the process of the method is simple and available; the gel solution can be prepared directly with the electrolyte solution being used as the solvent which can take away a large amount of polymerization heat generated by free radical polymerization; the prepared gel polymer electrolyte has satisfied ionic conductivity, and good space size stability and chemical and electro chemical stability.

Description

technical field [0001] The invention relates to a method for preparing nano silicon dioxide / polymethyl methacrylate gel polymer electrolyte by initiating polymerization in one step, and belongs to the interdisciplinary field of electricity and material science. Background technique [0002] In recent years, adding nanoparticles is the easiest way to improve the mechanical properties of gel electrolytes. Studies have found that adding ceramic powder or other inorganic fillers to gel electrolytes can not only make the electrolytes have satisfactory ionic conductivity and chemical stability. And electrochemical stability, but also has good mechanical properties, that is, dimensional stability. Commonly used nanoparticles are clay, SiO 2 , Zeolite, Al 2 o 3 Wait. [0003] There is a carbonyl side group in the unit of polymethyl methacrylate (PMMA), which has a strong effect on the oxygen in the carbonate plasticizer, so it can accommodate a large amount of liquid electrolyte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12C08K3/36C08F2/44C08F4/04
Inventor 马晓燕陈芳梁国正黄韵
Owner NORTHWESTERN POLYTECHNICAL UNIV
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