Preparation method of solid electrolyte

Abstract

The invention provides a preparation method of a solid electrolyte, which comprises the following steps: dispersing a lithium precursor and a central atom ligand in an organic solvent to form a reaction primary mixed solution; dispersing borate in an organic solvent to form a modified solution; mixing the reaction primary mixed solution with the modified solution, and drying to obtain an initial product; conducting grinding, cold pressing and heat treatment on the initial product to obtain the solid electrolyte. According to the preparation method provided by the invention, borate is used as adoping raw material to modify the sulfide solid electrolyte, and the B and O co-doped sulfide solid electrolyte can be obtained; in the doping modification process, sufficient mixing between the sulfide electrolyte raw material and borate is realized; the borate is completely decomposed at the phase-forming temperature of the sulfide electrolyte, so that the introduction of impurities or the residue of reactants is reduced, the ionic conductivity of the prepared sulfide solid electrolyte is remarkably improved, and the energy density of the all-solid-state battery is favorably exerted.

Description

technical field

[0001] The present application relates to the field of batteries, in particular to a method for preparing a solid electrolyte. Background technique

[0002] In recent years, with the rapid development of consumer electronics and electric vehicles, lithium-ion batteries have become the most widely used secondary battery technology in social life. However, with the rapid increase in the number of lithium-ion battery products, negative news about lithium-ion batteries smoking, catching fire and even exploding is endless. The safety and energy density of lithium-ion batteries need to be improved.

[0003] Traditional liquid lithium batteries are difficult to avoid battery safety accidents due to the volatile and flammable characteristics of liquid electrolytes. Therefore, solid electrolytes have attracted attention as an alternative product with higher safety performance. The existing solid electrolytes can be divided into three categories according to the mater...

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