Coating method for positive electrode material for sulfide solid-state battery

Abstract

The invention discloses a coating method of a positive electrode material for a sulfide solid-state battery. The method comprises the following steps: (1) placing a positive electrode material in a reaction chamber of ALD equipment; (2) when the temperature of the reaction chamber reaches a first set value, loading each precursor source to the reaction chamber through inert gas, and depositing a layer of fast ion conductor on the surface of the positive electrode material; (3) replacing the precursor source, continuously loading the sulfide electrolyte precursor source into the reaction chamber through the inert gas when the temperature of the reaction chamber reaches a second set value, and depositing a layer of sulfide solid electrolyte on the surface of the fast ion conductor layer; and (4) directly annealing the coated positive electrode material in an ALD reaction chamber, and naturally cooling to obtain the double-layer coated positive electrode material. The method provided by the invention is simple in process, the surface of the positive electrode material can be automatically and continuously coated with double coating layers in one step, and the deposited coating layers are uniform, conformal and controllable in thickness.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a coating method for a positive electrode material of a sulfide solid-state battery. Background technique [0002] All-solid-state batteries are one of the most promising next-generation energy storage devices with high safety, high energy density, and wide operating temperature window. Among them, sulfide solid-state electrolyte materials are the most promising materials for realizing high-performance all-solid-state batteries. Room-temperature Li-ion conductivities as high as 10 for several sulfide solid-state electrolytes -2 S cm -1 , such as Li 10 GeP 2 S 12 , Li 7 P 3 S 11 , Li 6 PS 5 Cl et al. The traditional commercial cathode material Li x MO 2 (M=Co, Ni, Mn), metal lithium anode, and sulfide solid-state electrolyte are assembled into an all-solid-state battery, resulting in a safer, higher energy density, and more stable lithium-ion...

AI Technical Summary

Problems solved by technology

Among them, the uniformity and integrity of the coating layer obtained by dry coating are poor, and it is difficult to ensure the uniformity of coating components; while the wet coating process is cumbersome and requires high solvents for coating materials

Especially for the coating of the sulfide electrolyte layer, the traditional dry coating cannot guarantee the uniformity and integrity of the coating layer. Usually, the electrolyte is attached to the surface of the matrix particles in the form of powder particles; while the wet coating process is complicated and it is difficult to guarantee The recrystallized sulfide electrolyte is evenly coated, and it is usually necessary to add other additives, such as film-forming agents or non-polar solvents, to assist the deposition of the sulfide electrolyte solution on the surface of the matrix particles

The above methods are difficult to achieve the best coating effect of sulfide electrolyte

In addition, the above-mentioned traditional coating method can only realize the coating of one coating layer at a time, and there are limitations

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