Solid electrolyte precursor, lithium battery and preparation method

Abstract

The invention discloses a solid electrolyte precursor, a lithium battery and a preparation method. The solid electrolyte precursor comprises a lithium salt, a dispersing agent, an initiator and polymer monomers, the lithium salt, the initiator and the polymer monomer are dispersed in the dispersing agent; the polymer monomers comprise pentaerythritol tetraenoic acid esters and hydroxyl-containingstraight-chain enoic acid esters, the initiator can initiate polymerization of the polymer monomers, and the solid electrolyte precursor is in a solid state after polymerization of the polymer monomers. The solid electrolyte precursor can be polymerized in the battery, and the dispersing agent and the lithium salt in the solid electrolyte precursor are remained in the formed polymer, so that the ionic conductivity is favorably improved. And meanwhile, hydroxyl-containing straight-chain enoic acid esters and pentaerythritol tetraolefine acid esters are adopted for copolymerization, so that theionic conductivity can be further improved, and the interface impedance in the battery can be reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a solid electrolyte precursor, a lithium battery and a preparation method. Background technique [0002] Secondary batteries have become an important part of human daily production and life. Lithium-ion batteries are currently the most widely used secondary batteries. Traditional lithium-ion batteries usually use electrolytes for the migration and conduction of lithium ions. [0003] However, batteries that use electrolytes pose potential safety hazards. For example, a battery with added electrolyte may swell after a long period of use. In the event of a small probability event, such as impact, high temperature and other accidents, the battery may short circuit, catch fire or explode. This safety hazard has led to the further application of batteries in the field of large-scale energy storage. [0004] All-solid-state batteries are a way to solve the above safety hazards. A...

AI Technical Summary

Problems solved by technology

On the other hand, there is an interface between the solid electrolyte and the electrode material, and the conduction of ions at the interface is slow, resulting in a high interface impedance.

This limits the charge-discharge performance of all-solid-state batteries at larger rates

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