A preparation method of solid electrolyte with surface coating and solid electrolyte battery

Abstract

The invention discloses a preparation method of a solid electrolyte with a surface coating. The preparation method comprises the steps of preparation of an LLZO ceramic chip, preparation of FS glue, formation of the solid electrolyte and the like. The invention further provides a solid-state electrolyte battery which comprises the solid electrolyte prepared by the preparation method of the solid electrolyte with the surface coating, and further comprises a positive electrode layer and a negative electrode layer which are arranged on the two sides of the solid electrolyte. The solid electrolyteprepared by the method has the advantages that firstly, an inorganic ceramic material is doped with Ga and Nb elements, so that the cubic phase structure of LLZO is stabilized, and the ionic conductivity is correspondingly improved; secondly, the two sides of the inorganic solid electrolyte are coated with the mixed fumed silica in the lithium ion electrolyte, so that the problem of interface contact is effectively solved, and the lithium ion conductivity of the lithium ion electrolyte is ensured; and the solid electrolyte of the solid electrolyte battery is prepared by the preparation methodof the solid electrolyte with the surface coating, and has the advantages of small interface impedance, high lithium ion conductivity and the like.

Description

technical field

[0001] The invention relates to the field of solid-state electrolyte batteries, in particular to a method for preparing a solid-state electrolyte with a surface coating and a solid-state electrolyte battery. Background technique

[0002] Among all energy conversion and storage systems, batteries are one of the most convenient devices for efficient energy utilization. With the development of lithium-ion battery technology, lithium-ion batteries have been widely used in 3C products, electric vehicles and other fields. At present, lithium-ion batteries still have disadvantages such as low energy density, poor safety, and short life.

[0003] When the negative electrode of the battery is replaced by metal lithium, because metal lithium has the lowest electrochemical potential (-3.04V) and a maximum of 3861mAh g -1 The mass-to-capacity ratio will greatly increase the energy density of the battery, but at the same time it will face the problem of lithium dendrite...

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