Solid electrolyte, solid lithium ion battery and preparation method of solid lithium ion battery

Abstract

The invention discloses a solid electrolyte, a solid lithium ion battery and a preparation method of the solid lithium ion battery. The solid electrolyte is a quaternary solid polymer electrolyte formed by crosslinking polyethylene oxide, bis(trifluoromethylsulfonyl)imide, branched chain polymethyl methacrylate and silicon dioxide in a molar ratio of (8-10): (1-2): (2-3): (1-2) under photo-initiation, and is a solid electrolyte adapted to a 4V high-voltage positive electrode material. The solid lithium ion battery comprises a 4V-grade elastic positive electrode layer, a solid electrolyte layerand an elastic negative electrode layer which are packaged by packaging films, and is an elastic solid lithium ion battery with 4V high-voltage output.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a solid electrolyte, a solid lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries (LIBs) have successfully occupied the electronic product market, but their performance in the field of electric vehicles (EV) is far from satisfactory. The main reason is that while LIBs meet the demand for high energy density, safety issues remain main problem. Frequent electric vehicle fire accidents have caused considerable concern about LIBs. Battery safety issues are caused by different reasons, such as overcharging, abuse, internal or external short circuit of the battery, etc., but these are more or less related to the use of volatile, flammable and toxic liquid organic carbonate-based electrolytes with lithium-ion batteries related. [0003] Compared with traditional liquid organic carbonate-based electrolytes, solid p...

AI Technical Summary

Problems solved by technology

However, the highest occupied molecular orbital (HOMO) of PEO is quite low, resulting in poor high-pressure oxidation stability of the ethylene oxide chain.

Therefore, solid polymer electrolytes based on PEO can only be limited to 3 V-level positive electrode materials. Therefore, the prepared solid-state lithium-ion batteries have low voltage and are difficult to assemble into high-power batteries suitable for electric vehicles, which limits the use of solid-state lithium-ion batteries in Applications in the field of electric vehicles