Negative electrode active material, solid battery, and method for manufacturing negative electrode active material

Abstract

A negative electrode active material that is less prone to a decrease in pore size is provided. [Solution] The negative electrode active material of this disclosure comprises a plurality of Si-based particles. The Si-based particles comprise porous Si particles and a metal oxide film formed on at least a portion of the surface of the porous Si particles. The metal oxide film comprises at least one of Mg and Al elements.

Claims

1. Contains multiple Si-based particles, The Si-based particles include porous Si particles and a metal oxide film formed on at least a portion of the surface of the porous Si particles. The negative electrode active material wherein the metal oxide film contains at least one element Mg and element Al.

2. The negative electrode active material according to claim 1, wherein the metal oxide film is made of MgO.

3. The negative electrode active material according to claim 1, wherein the thickness of the metal oxide film is 3 nm to 8 nm.

4. It comprises a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode, The negative electrode has a negative electrode active material layer, A solid-state battery wherein the negative electrode active material layer contains the negative electrode active material described in claim 1.

5. Preparing multiple porous Si particles, A metal silicide is deposited onto the porous Si particles by physical vapor deposition in a non-oxidizing atmosphere to form a metal oxide film on at least a portion of the surface of the porous Si particles. Includes, A method for producing a negative electrode active material, wherein the metal silicide contains at least one element of Mg and element of Al.

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