Device for producing composite active material powder and method for producing composite active material powder

Abstract

A device produces a composite active material powder by coating active material or composite particle surfaces, which are obtained by coating the active material particle surfaces with an oxide-based solid electrolyte, with a sulfide-based solid electrolyte. The device includes: a storage body having a cylindrical inner wall surface, and a rotating body disposed in an internal space surrounded by the storage body inner wall surface, having a rotating shaft aligned with the internal space central axis, and which includes blades. Each blade end part has such a tapered section on a front side in the rotating body rotation / movement direction, that a thickness of the blade gradually tapers toward a blade end side, and each blade end part has such a curved end surface on a back side in the rotating body rotation / movement direction, that the curved end surface faces the storage body inner wall surface and is generally parallel thereto.

Description

BACKGROUND OF THE INVENTION[0001]Technical Field[0002]The present invention relates to a device for producing a composite active material powder and a method for producing a composite active material powder.[0003]Background Art[0004]In the field of all-solid-state batteries, there is an attempt to improve the performance of all-solid-state batteries, focusing on an interface between the electrode active material and the solid electrolyte material.[0005]Examples of conventional methods for coating the surfaces of active material-containing particles with a sulfide-based solid electrolyte, include gas phase methods such as pulsed laser deposition (hereinafter may be referred to as PLD). However, the PLD method is generally slow in film-forming rate, so that it is remarkably low in productivity and is not practical. Also in the PLD method, the target of the sulfide-based solid electrolyte is turned into a plasma by laser irradiation. At this time, the composition of the sulfide-based s...

AI Technical Summary

Benefits of technology

The patent aims to provide a device and method for producing a composite active material powder that can reduce the internal resistance of a battery. The technical effect of the invention is the production of a more efficient and effective material that can improve the performance of batteries.

Problems solved by technology

However, the PLD method is generally slow in film-forming rate, so that it is remarkably low in productivity and is not practical.

At this time, the composition of the sulfide-based solid electrolyte may be changed and may not be maintained.

However, in such mixing / kneading methods using the medium, mechanical damage is applied in collision with the medium and, as a result, the surfaces of the active material-containing particles may be damaged.

However, the use of the conventional composite active material powder production device as disclosed in Patent Literature 1, is problematic in that the internal resistance of a battery using the thus-obtained composite active material powder is large.

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