Preparation method of solid electrolyte and solid-state battery

Abstract

The invention relates to a preparation method of a solid electrolyte. The preparation method comprises the steps of preparing a base material; uniformly mixing the base material and an organic solvent, pouring on a stainless steel plate to form a liquid film, and drying to obtain a solid base film; depositing a solution of an ionic conductive material on the two surfaces of the solid base film to form an ionic conductive material layer so as to obtain an initial solid electrolyte; performing heat treatment on the initial solid electrolyte; and exposing the initial solid electrolyte subjected to heat treatment in air to form a pre-passivation layer, carrying out surface chemical reaction by using an inorganic acid solution, and forming a three-dimensional cross-linked LiF-LiCl (CF) modification layer on the end surface, which is away from the solid base film, of the ionic conductive material layer. The invention also relates to a solid-state battery. The solid-state battery comprises the solid-state electrolyte layer prepared by the preparation method.

Description

technical field [0001] The present invention relates to the field of batteries, especially the field of lithium ion batteries. More specifically, the present invention relates to a preparation method of a solid electrolyte and a solid state battery using the solid electrolyte. Background technique [0002] The preparation of electrolyte membrane (also known as diaphragm) is one of the core technologies of lithium-ion batteries. It plays a role in preventing positive / negative short circuit in the battery and providing ion transport channels during charging and discharging. The performance of the electrolyte membrane determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle performance, charge and discharge current density, and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. Compared with liquid lithium batteries, so...

AI Technical Summary

Problems solved by technology

At present, the solid-state electrolytes widely used in solid-state batteries are inorganic solid-state electrolytes, but the technical problems of the existing inorganic solid-state electrolytes are: 1. All-solid-state lithium batteries have severe interface effects between the positive electrode material and the solid-state electrolyte and The problem of element diffusion at the interface leads to a great increase in the interface impedance between the positive electrode and the solid electrolyte, which greatly affects the performance of the battery; 2. The ionic conductivity of the inorganic solid electrolyte is low, which cannot meet the high power output requirements of solid-state batteries