Ultraviolet-curing and semi-interpenetrating network-structure polycarbonate-based solid-state polymer electrolyte and preparation method thereof

Abstract

The invention discloses an ultraviolet-curing and semi-interpenetrating network-structure polycarbonate-based solid-state polymer electrolyte and a preparation method thereof. The ultraviolet-curing and semi-interpenetrating network-structure polycarbonate-based solid-state polymer electrolyte is characterized in that a crosslinking agent is automatically cross-linked to form a framework, polycarbonate is taken as a solid-state polymer substrate uniformly filled in the framework, a lithium salt is dispersed in the solid-state polymer substrate, the weight ratio of the lithium salt and the polycarbonate is (4:6)-(9:1), and the crosslinking agent accounts for 5-50% of total weight of the solid-state polymer electrolyte. The solid-state polymer electrolyte is simple in preparation method, high in room-temperature electrical conductivity and good in electrochemical and interface stability, can be self-supported and can be used as an electrolyte of a lithium ion battery, and the oxygenolysis potential is larger than 4.5V.

Description

technical field [0001] The invention relates to the field of electrolytes, in particular to a polycarbonate-based solid polymer electrolyte with an ultraviolet-cured semi-interpenetrating network structure and a preparation method thereof. Background technique [0002] In recent years, with the development of electric vehicles and grid energy storage, people's demand for high-safety, high-energy-density power batteries and energy storage systems has become more and more urgent. Among commercial electrochemical energy storage devices, lithium-ion batteries are undoubtedly the best choice. Lithium-ion batteries are widely used due to their high energy density, high working voltage, long cycle life, low self-discharge rate, no memory effect, fast charging and discharging, and environmental friendliness. However, traditional liquid lithium-ion secondary batteries Contains a large amount of organic electrolyte, which has the disadvantages of being volatile, flammable, and explos...

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Problems solved by technology

[0005] Polycarbonate is a new type of polymer electrolyte, which is characterized by the dissolution and dissociation of high-concentration lithium salts to achieve high room temperature conductivity. The problem with this type of electrolyte is that with the addition of a large amount of lithium salts, the electrolyte Significant deterioration of mechanical properties, unable to achieve self-support

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