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Production method of hydrotalcite-modified polyvinylidene fluoride-based gel electrolyte

A technology of gel electrolyte and polyvinylidene fluoride, which is applied in the fields of chemical engineering and material science, can solve the problems of low mechanical strength, easy volatilization of plasticizers, and poor electrochemical stability, and achieve improved conductivity, good dispersion, and mechanical The effect of increasing strength

Inactive Publication Date: 2008-06-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, gel-type polymer electrolytes also have disadvantages such as low mechanical strength, volatile plasticizers, and poor electrochemical stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Will be dissolved with 0.2mol Mg(NO 3 ) 2 and 0.1mol Al(NO 3 ) 3 Slowly added dropwise to the aqueous solution in which 0.2mol sodium perfluorooctanoate was dissolved, and NaOH aqueous solution was added dropwise at the same time to maintain the system pH=10. in N 2 Under protection, react at 50°C for 12h, then age and crystallize at 80°C for 24h, filter with suction, wash with deionized water, and dry to obtain perfluorooctanoate-intercalated hydrotalcite. Add 0.5g of perfluorooctanoate intercalated hydrotalcite, 200g of deionized and 0.5g of sodium perfluorooctanoate emulsifier into the autoclave, seal it, replace it with high-purity nitrogen and vacuumize it, raise the temperature to 75°C, and press in a total of 100g of Vinyl fluoride monomer, add 1.0g potassium persulfate initiator in two times for polymerization, stop polymerization when the system pressure drops by 1.5MPa, recover unreacted monomer, discharge, condense, and dry to obtain hydrotalcite modified...

Embodiment 2

[0022] Will be dissolved with 0.2mol Mg(NO 3 ) 2 and 0.1mol Al(NO 3 ) 3 Slowly added dropwise to the aqueous solution in which 0.2mol sodium perfluorooctanoate was dissolved, and NaOH aqueous solution was added dropwise at the same time to maintain the system pH=10. in N 2Under protection, react at 60°C for 8 hours, then age and crystallize at 100°C for 18 hours, filter with suction, wash with deionized water, and dry to obtain perfluorooctanoate-intercalated hydrotalcite. Add 1.5g of perfluorooctanoate intercalated hydrotalcite, 250g of deionized and 1.0g of perfluorooctanoate sodium emulsifier into the autoclave, seal it, replace it with high-purity nitrogen and vacuumize it, raise the temperature to 55°C, and press in 15 times a total of 100g partial Vinyl fluoride monomer, add 2.50g potassium persulfate initiator in two times for polymerization, stop polymerization when the system pressure drops by 1.0MPa, recover unreacted monomer, discharge, condense, and dry to obta...

Embodiment 3

[0024] Will be dissolved with 0.2mol Mg(NO 3 ) 2 and 0.1mol Al(NO 3 ) 3 Slowly added dropwise to the aqueous solution in which 0.2mol sodium perfluorooctanoate was dissolved, and NaOH aqueous solution was added dropwise at the same time to maintain the system pH=10. in N 2 Under protection, react at 80°C for 2h, then age and crystallize at 150°C for 15h, filter with suction, wash with deionized water, and dry to obtain perfluorooctanoate-intercalated hydrotalcite. Add 3.0g of perfluorooctanoate intercalated hydrotalcite, 300g of deionized and 1.5g of sodium perfluorooctanoate emulsifier into the autoclave, seal it, replace it with high-purity nitrogen and vacuumize it, raise the temperature to 45°C, and continuously press in a total of 100g of vinylidene fluoride The monomer is polymerized with 1.0 g potassium persulfate-sodium thiosulfate initiator, and when the system pressure drops by 1.5 MPa, the polymerization is stopped, the unreacted monomer is recovered, discharged...

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Abstract

Production of hydrotalcite modified polyvinylidene fluoride gel electrolyte is carried out by preparing perfluoro-octanoic acid intercalation hydrotalcite by coprecipitation, polyvinylidene fluoride in-situ dispersion polymerizing under existence of perfluoro-octanoic acid intercalation to obtain hydrotalcite modified polyvinylidene fluoride composite resin, dissolving dispersing hydrotalcite modified polyvinylidene fluoride resin in dimethyl formamide containing lithium salt and cooling to obtain final product. It has better affinity, stripping performance and thermal stability, higher lithium ion conductibility and less plasticizer volatility.

Description

technical field [0001] The invention relates to a preparation method of a polyvinylidene fluoride-based gel electrolyte, in particular to a preparation method of a hydrotalcite-modified polyvinylidene fluoride-based gel electrolyte. The invention belongs to the technical fields of chemical engineering and material science. Background technique [0002] Polymer electrolytes are both electrolytes and separators between electrodes in chemical power sources such as lithium-ion batteries. Its application is in line with the development trend of light weight, safety, high efficiency and environmental protection to a certain extent. It has received great attention from all countries. [0003] Polymer electrolytes can be divided into all-solid polymer electrolytes and gel-type polymer electrolytes. Generally, the conductivity of all-solid polymer electrolytes is low, which makes it difficult to meet the practical requirements of lithium batteries. Gel-type polymer electrolytes ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/44C08F114/22C08L27/16C08K3/34
Inventor 包永忠黄志明翁志学
Owner ZHEJIANG UNIV