Direct compounding method of metal lithium electrode and inorganic solid electrolyte ceramic diaphragm

Abstract

The invention relates to a direct compounding method of a metal lithium electrode and an inorganic solid electrolyte ceramic diaphragm, and belongs to the field of electrochemical engineering and ceramic industry. According to the method, the surface tension of the lithium liquid is reduced by increasing the melting temperature; through a friction mode, meanwhile, an oxide layer on the surface ofthe lithium liquid and air pits formed in the micro surface of the ceramic diaphragm due to unevenness are destroyed. Fresh lithium liquid makes direct contact with the ceramic diaphragm body and theninfiltrates and spreads, and the problems that in a conventional method, the lithium liquid is difficult to infiltrate on the surface of the ceramic diaphragm, the solid / solid interface contact resistance of the metal lithium electrode and the inorganic solid electrolyte ceramic diaphragm is large, and the stability is poor are solved. According to the method, the direct compounding of the metallithium electrode and the inorganic solid electrolyte ceramic diaphragm is realized without depositing a transition infiltration layer on the surface of the ceramic diaphragm in advance in manners ofatomic deposition and the like, the process flow is simple, and the method is particularly suitable for a solid-state battery system taking metal lithium as a negative electrode and taking oxide inorganic solid electrolyte ceramic as a diaphragm.

Description

technical field [0001] The invention relates to a composite method of a metal lithium electrode and an inorganic solid electrolyte ceramic diaphragm, which belongs to the fields of electrochemical engineering and ceramic industry. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density and high specific power, and are developing rapidly and widely used. However, from small mobile phones to medium-sized electric vehicles to large-scale energy storage power stations, lithium-ion battery combustion and explosion safety accidents emerge in endlessly. Safety issues have undoubtedly become a major obstacle restricting the application of lithium-ion batteries. All-solid-state batteries use ceramic inorganic solid electrolytes to replace flammable and explosive organic electrolytes. It is considered the "ultimate" solution to battery safety issues and can fundamentally solve battery safety issues. Although it is difficult, it has become a ...

AI Technical Summary

Problems solved by technology

This method of surface atom deposition to modify the wetting layer will inevitably further increase the process difficulty and manufacturing cost of the battery, and increase the difficulty of popularization and application.

Not only that, the cycle stability of the reported Li|LLZO|Li symmetric batteries is not ideal, and there are still problems of lithium dendrite short circuit and solid / solid interface instability.

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