US 12,431,490 B2
Active material, battery, and methods for producing these
Kazuhiro Suzuki, Hadano (JP); and Jun Yoshida, Mishima (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Apr. 17, 2023, as Appl. No. 18/301,340.
Application 18/301,340 is a division of application No. 17/329,480, filed on May 25, 2021, granted, now 11,894,551.
Claims priority of application No. 2020-098710 (JP), filed on Jun. 5, 2020.
Prior Publication US 2023/0253557 A1, Aug. 10, 2023
Int. Cl. H01M 4/38 (2006.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01)
CPC H01M 4/386 (2013.01) [H01M 4/0471 (2013.01); H01M 4/366 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for producing an active material, the method comprising:
a preparing step of preparing a Zintl compound including Na, Si, and Al, and including at least a Zintl phase,
a Na removing step of removing the Na from the Zintl compound, and forming an intermediate including a silicon clathrate type crystal phase, and
an Al removing step, after the Na removing step, of removing the Al from the intermediate so that a proportion of the Al to a total of the Si and the Al is 0.1 atm % or more and 1 atm % or less in the active material,
wherein the active material includes a silicon clathrate II type crystal phase as a main phase.