Alkyl silicyl lithium battery polymer electrolyte resistant to high voltage, preparation method and application thereof in all-solid-state lithium battery

Abstract

The invention relates to an alkyl silicyl lithium battery polymer electrolyte resistant to high voltage, a preparation method and application of the electrolyte in a lithium battery. The electrolyte comprises alkyl silicyl polymers, lithium salt, a porous supporting material and additives. Experiments show that the alkyl silicyl polymer electrolyte material has good film forming property and the mechanical strength is 0.5-300MPa; an electrochemical window of the electrolyte material is higher than 4.3V, and the electrolyte material has good compatibility with a high voltage cathode material; ionic conductivity at room temperature is 1*10<-5>S*cm<-1>-10<-3> S*cm<-1>, and a battery assembled by adopting the electrolyte material has excellent long cycle performance. The alkyl silicyl lithiumbattery polymer provided by the invention can be taken as a high-voltage-resistant electrolyte material. The invention also provides a preparation method of the polymer electrolyte and electrochemicalproperties of an all-solid-state lithium battery assembled by adopting the electrolyte provided by the invention.

Description

technical field [0001] The invention relates to a solid polymer electrolyte, in particular to a high-voltage-resistant alkylsilyl lithium battery polymer electrolyte, a preparation method and its application in an all-solid lithium battery. Background technique [0002] Due to the advantages of high energy density, low cost, and long cycle life, lithium batteries have always been the focus of scientific researchers and entrepreneurs. At present, lithium batteries have been widely used in people's daily life, such as power supply for mobile devices, notebook computers, electric and hybrid vehicles, and smart grids. [0003] At the same time, the development of lithium batteries is also facing huge challenges: First, the current commercial lithium batteries are not safe enough. As we all know, there are two main types of electrolytes used in commercial lithium batteries: one is liquid electrolyte and the other is gel electrolyte. The above two electrolytes have high ionic co...

AI Technical Summary

Problems solved by technology

However, the electrolyte film formation and mechanical properties are slightly insufficient

[0005] In summary, although all-solid polymer electrolytes have superior advantages and great application prospects, most of the currently reported all-solid polymer electrolytes are difficult to withstand high voltage, high ionic conductivity, good film-forming properties and high mechanical strength. requirements, it is difficult to apply commercially

Images