Method for improving lithium dendrite at solid electrolyte interface with carbon fluoride

Abstract

The invention discloses a method for improving lithium dendrite at a solid electrolyte interface with carbon fluoride. The method comprises the following steps: step 1, polishing a garnet electrolytesheet with sandpaper; and step 2, modifying the carbon fluoride on the polished surface of the garnet electrolyte sheet so as to obtain the garnet electrolyte sheet modified with the carbon fluoride.The garnet electrolyte sheet modified with the carbon fluoride prepared by the method can be used for assembling an all-solid-state battery based on an inorganic solid electrolyte. Compared with the methods in the prior art, the method has the following advantages: (1) the operation method is simple and reliable and the time consumption is short without using high-end instruments; and (2) the improvement efficiency is excellent and large-scale production is feasible.

Description

technical field

[0001] The invention belongs to the technical field of solid electrolytes, and relates to a method for improving the performance of a garnet type solid lithium ion battery by using carbon fluoride as an intermediate layer. Background technique

[0002] All-solid-state batteries (ASSBs) based on inorganic solid electrolytes offer higher safety, higher energy density, longer cycle life, and lower cost than conventional lithium-ion batteries. In addition, lithium dendrites may be suppressed due to the high shear modulus of such electrolytes. Among various Li-ion-conducting materials, cubic garnet solid-state electrolytes exhibit excellent stability to Li metal and superior Li-ion conductivity close to 1 ms cm at ambient temperature. -1 , so it is particularly attractive. However, the high resistance of the solid-solid electrode-electrolyte interface and the penetration of lithium dendrites hinder their practical applications. Adding an intermediate layer at t...

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