Preparation of polymer solid electrolyte

Abstract

The invention discloses a method for preparing polymer solid electrolyte, which adopts mixed epoxy resin and nitrile rubber as a substrate of the solid electrolyte, dissolves the substrate and lithium perchlorate in tetrahydrofuran, and prepares the composite polymer solid electrolyte by a solution casting method. The method is simple to operate and easy to form a film, and the prepared polymer solid electrolyte can overcome the defects of difficult forming of gel type polymer electrolyte, complex film-making process of polymer / ionic liquid electrolyte, etc., and simultaneously can solve the safety problems of easy volatilization and easy leakage of electrolyte of a liquid lithium ion battery. The electrical conductivity of the prepared polymer solid electrolyte can reach 1.81*10<-4> S.cm<-1> at a temperature of 20 DEG C, improves by 3 to 4 times compared with pure nitrile rubber / lithium perchlorate polymer electrolyte, and is in the same level with the electrical conductivity of polymer electrolyte which is reported in literature and prepared by compositing the nitrile rubber and an ionic liquid. The prepared polymer solid electrolyte has stable performance at a temperature of less than 200 DEG C, and can meet the use requirement on the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a functional polymer material, in particular to a preparation method of a polymer solid electrolyte, which can be applied to lithium ion batteries. Background technique [0002] Polymer electrolytes are generally composed of polymer matrix and metal salts, which are suitable as electrolyte materials for lithium-ion batteries. Polyethylene oxide (PEO) is currently the most studied polymer electrolyte matrix material, however, the complexes of PEO and lithium salts have high crystallinity at room temperature, and the conductivity is only 10 -7 ~10 -8 S cm -1 , the method of adding organic liquid plasticizer is commonly used to reduce the crystallinity of PEO, but this will also destroy the mechanical properties of the electrolyte and increase its reactivity with lithium negative electrode materials, reducing battery life. At present, polymer solid electrolyte is an important development trend. In the p...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to prepare a polymer solid electrolyte, so that it can overcome the difficulties in forming gel-type polymer electrolytes and the complicated membrane-making process of polymer / ionic liquid electrolytes, and at the same time overcome the electrolysis of liquid lithium-ion batteries. The safety problem of liquid is volatile and easy to leak

Images