Method of coating solid electrolyte with electrode material, coating material, and electrode prepared using coating method

Abstract

The present invention provides a method for coating an electrode material with a solid electrolyte, an obtained coating material, an electrode prepared by using the coating material, and an all-solid-state battery obtained by using the electrode. The solid electrolyte material mainly aims at halide electrolyte, and comprises LiaMXb, M is one or more of Al, Ga, In, Sc, Y, La, Ho, Sc and the like, Xis one or more of F, Cl and Br, a is more than or equal to 0 and less than or equal to 10, b is more than or equal to 1 and less than or equal to 13, and the X is represented as Li3InCl6, Li3YCl6, Li3YBr6, Li3HoCl6, Li3ScCl6 and the like, and can also be a mixture for coating a solid electrolyte and a conductive agent. According to the invention, the contact between the electrolyte and the electrode material can be significantly improved, the porosity of the pole piece is reduced, the ionic conductivity of the solid electrolyte is not changed after an alkane solvent treatment process, an all-solid-state battery assembled by the electrode material containing the coating layer is simple in process, and the battery can exert high capacity and good rate capability and has a commercial prospect.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, and discloses a method for coating a solid electrolyte on an electrode material with a solvent, and an application of a material containing a coating layer in a battery. Background technique [0002] It has been reported in the literature that Li 3 InCl 6 , Li 3 YCl 6 , Li 3 YBr 6 , Li 3 HoCl 6 , Li 3 ScCl 6 The synthesis of halide solid-state electrolytes, and is used in the field of solid-state batteries. The synthesis method of this type of electrolyte is simple and can be synthesized by liquid phase method, for example: Li 3 InCl 6 Solid state electrolyte, and this type of material can be combined with the positive electrode material to form a coating material through a liquid phase coating method. [0003] Theoretically, the electrode material containing the electrolyte coating layer is more fully combined with the electrolyte and the battery material than the method o...

AI Technical Summary

Problems solved by technology

[0004] At present, battery materials are developing toward high specific capacity and high specific energy. High-nickel ternary materials are also one of the battery materials, but NCM811, NCA, etc. coated with halide electrolytes synthesized in situ with water or alcohols Materials, because moisture is easily introduced during the synthesis process, which greatly reduces the battery performance of the positive electrode material. Obviously, this method of water phase or alcohol in-situ synthesis is not suitable for water-sensitive materials such as NCM high-nickel materials and NCA.

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