CPC H01M 4/386 (2013.01) [H01M 4/0471 (2013.01); H01M 4/366 (2013.01)] | 5 Claims |
1. An active material comprising at least Si and Al,
including a silicon clathrate type crystal phase, and
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 and the active material is represented by Nax (Si, Al)136, where 0≤x≤20.
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