Process for preparing blended micrometer TiO2 polymer electrolyte

A polymer and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems affecting the performance of electrolyte membranes, electrolyte membrane inhomogeneity, high surface activity, etc., to facilitate absorption, improve mechanical properties, micro The effect of uniform hole distribution

Inactive Publication Date: 2005-08-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since both methods use nanomaterials as fillers, and nanomaterials have high surface activity and are not easy to disperse, resulting in the inhomogeneity of the electrolyte membrane, which affects the performance of the electrolyte membrane.

Method used

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  • Process for preparing blended micrometer TiO2 polymer electrolyte
  • Process for preparing blended micrometer TiO2 polymer electrolyte
  • Process for preparing blended micrometer TiO2 polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh PVDF-HFP (U.S. Elf atochem LBG-1) 3g and D 50 = 1.4 μm TiO 2 (Analytical pure) 0.13g was put into the Erlenmeyer flask, weighed 1.5g of deionized water and 30g of acetone, mixed them and added them to the polymer matrix PVDF-HFP and TiO 2 in the Erlenmeyer flask;

[0020] (2) The above mixture is placed in a water bath with a constant temperature of 60°C, heated and magnetically stirred for 2 hours, then cooled to room temperature while stirring, and a white viscous casting solution is obtained;

[0021] (3) After the above-mentioned casting solution is ultrasonically dispersed for 8 minutes, a milky white casting solution is obtained;

[0022] (4) casting the milky white casting solution in a mould, and obtaining a white uniform porous polymer electrolyte membrane after the solvent and non-solvent volatilize;

[0023] (5) placing the obtained porous polymer membrane in an oven at 50° C. for heat treatment for 6 hours;

[0024] (6) In a dry environment, im...

Embodiment 2

[0028] (1) Weigh PVDF-HFP (U.S. Elf atochem LBG-1) 3g and D 50 = 1.4 μm TiO 2 (Analytical pure) 0.08g is put into the Erlenmeyer flask, weighs 1.5g of deionized water, 30g of acetone, mixes and adds to the solution containing the polymer matrix PVDF-HFP and TiO 2 in the Erlenmeyer flask;

[0029] (2) Place the above mixture in a water bath with a constant temperature of 50°C, heat and magnetically stir for 4 hours, then cool to room temperature while stirring to obtain a white viscous casting solution;

[0030] (3) After the above-mentioned casting solution was ultrasonically dispersed for 16 minutes, a milky white casting solution was obtained;

[0031] (4) casting the milky white casting solution in a mould, and obtaining a white uniform porous polymer electrolyte membrane after the solvent and non-solvent volatilize;

[0032] (5) placing the obtained porous polymer film in an oven at 80° C. for heat treatment for 10 hours;

[0033] (6) In a dry environment, immerse the ...

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Abstract

The present invention relates to the preparation process of electrolyte for polymer lithium ion cell. The present invention uses micron level TiO2 powder as stuffing for polymer electrolyte film, and prepares PVDF-HFP base polymer electrolyte film via phase transfer process. In the weight ratio of PVDF-HFP to TiO2 in 9-49, weight ratio of PVDF-HFP to deionized water to acetone in 1 to 0.25-1.25 to 5-15, the mixture of solvent and non-solvent is added into the mixture of polymer matrix PVDF-HFP and micron stuffing TiO2 to obtain while homogeneous porous polymer film, which is then soaked in electrolyte liquid for lithium ion cell to obtain electrolyte film with ionic conducting performance and finally heat treated. The present invention has improved and stabilized pore structure of polymer electrolyte film and raised electrochemical performance and mechanical performance of electrolyte film.

Description

technical field [0001] The invention relates to a preparation method of a polymer electrolyte, in particular to the preparation of a polymer lithium ion battery electrolyte. Background technique [0002] Polymer lithium-ion battery not only has the characteristics of high voltage, high specific energy, long cycle life and environmental protection of liquid lithium-ion battery, but also can be made into thin, light and arbitrary shape battery because it adopts all-solid flexible packaging. This feature just meets the requirements of portable electrical appliances for light and thin power supplies. At present, the key technology of polymer lithium ion battery is the preparation of polymer electrolyte membrane. As the separator and electrolyte of lithium-ion batteries, polymer electrolytes should have the characteristics of high room temperature ionic conductivity, good electrode interface stability, wide electrochemical window and good mechanical properties. Polymer electrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08K3/22C08L101/00H01M10/40
CPCY02E60/122
Inventor 王新东刘伯文
Owner UNIV OF SCI & TECH BEIJING
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