Patent ID: 11967715
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC H

Claim 0:
1. A method for producing an active material comprising a silicon clathrate II type crystal phase, and having a composition represented by NaxSi136, wherein 1.98<x<2.54, the method comprising:
a preparing step of preparing an intermediate including a silicon clathrate II type crystal phase and having a composition represented by NaySi136, wherein 8≤y≤21,
an alloying step of obtaining an alloy compound by alloying the intermediate and a Li based material by mixing the intermediate and the Li based material,
a Li removing step of removing Li from the alloy compound by reacting the alloy compound with a Li extracting material, and obtaining a porous compound including a void inside a primary particle, and
a Na removing step of removing Na from the porous compound by a heat treatment.