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Compounded polymer electrolyte material and its preparation method

An electrolyte material and polymer technology, applied in the field of composite polymer electrolyte materials and their preparation, can solve problems such as low electrical conductivity, and achieve the effects of good mechanical properties, improved electrical conductivity and good thermal stability

Inactive Publication Date: 2005-05-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

An important trend is to develop all-solid polymer electrolytes to replace the current liquid-containing polymer electrolytes, but the use of composite polymer electrolytes prepared purely by adding inorganic powders also has the limitation of low conductivity.

Method used

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  • Compounded polymer electrolyte material and its preparation method
  • Compounded polymer electrolyte material and its preparation method
  • Compounded polymer electrolyte material and its preparation method

Examples

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Effect test

preparation example Construction

[0030] (3) Preparation of polymer electrolyte film

[0031] The composite polymer electrolyte is prepared by compounding the soaked inorganic oxide powder and the polymer lithium salt by a solution casting method. First, weigh PEO and LiClO 4 2% to 30% of the total weight percentage of the soaked inorganic mesoporous powder is ultrasonically dispersed in acetonitrile solvent for 10 minutes, and then the corresponding PEO and LiClO are added according to the molar ratio of O / Li of 8 to 16 4 , stirred until uniform, then poured the solution onto a polytetrafluoroethylene plate, evaporated the solvent, and then dried it in a vacuum oven to form a film.

Embodiment 1

[0033] (a) The mesoporous inorganic powder used in this example is mesoporous SiO 2 , first calcined at 500°C for 2 hours to remove the organic template for later use, referred to as MCM-41. The BET specific surface area of ​​MCM-41 is 965m 2 / g, the pore volume is 0.84cm 3 / g, the average pore diameter is 3nm (determined by XRD method). figure 1 Mesoporous SiO 2 (MCM-41) scanning electron micrograph, figure 2 Mesoporous SiO 2 (MCM-41) high-resolution transmission electron micrograph, image 3 Mesoporous SiO 2 (MCM-41) small angle XRD pattern;

[0034] (b) Prepare plasticizers EC and PC according to the weight percentage ratio of 1:1. Soak mesoporous inorganic powder MCM-41 in plasticizer EC / PC. Soaking time is 5 days, vacuum state, temperature is 150 ℃. Then take it out before the plasticizer remains and vacuum filter it, and continue drying in a drying oven at 50°C to remove the plasticizer on the surface. Figure 4Mesoporous SiO shown 2 (MCM-41) and EC / PC soake...

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Abstract

The invention relates to a composite polymer electrolyte material and a preparation method thereof, belonging to the technical field of electrolyte material preparation. The present invention uses high specific surface area mesoporous inorganic oxide powder as raw material, soaks the powder in a plasticizer for pretreatment, makes the plasticizer enter into the pores of nano inorganic matter, and then heats to remove the plasticizer on the surface of the inorganic powder, Only the plasticizer in the channels remains. Composite polymer electrolyte is prepared by compounding the composite powder and polymer lithium salt by simple solution casting method. Compared with the composite electrolyte prepared by simple equal amount of inorganic powder or simple equal amount of plasticizer, the electrical conductivity of the electrolyte film prepared by the inorganic filler treated by this method is significantly improved, and has good mechanical properties. It has the characteristics of good thermal stability, high interface stability and electrochemical stability. It can be applied to the preparation of secondary lithium ion batteries.

Description

technical field [0001] The invention relates to a polymer electrolyte material and a preparation method thereof, in particular to a composite polymer that can be applied in the fields of energy storage of new high-performance solid-state batteries, energy conversion of fuel cells, chemical sensors, electrochemical capacitors, etc. Electrolyte material and method for its preparation. Background technique [0002] Polymer electrolytes are especially suitable as electrolyte materials for lithium batteries due to their light weight, good viscoelasticity, and good film-forming properties. Polyoxyethylene (PEO) has attracted much attention due to its structural characteristics of easy ion conduction. However, the polymer electrolyte formed by PEO and alkali metal salt has a high crystallization phase at room temperature, and the formed electrolyte can only be used at high temperature. It can only be used under the environment, so its practical application is limited. The method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08K3/20C08L27/08C08L33/00C08L71/00
Inventor 南策文范丽珍
Owner TSINGHUA UNIV