| abstract |
PROBLEM TO BE SOLVED: To provide an active material excellent in cycle characteristics. An active material according to an embodiment includes a coating in which M is one or more elements selected from Si, Sn, Al, and Ti, and includes an M—O—C mixture; And a particle containing an element of M. The particle containing an element of M contains an element of M or an alloy containing an element of M, and the M-O-C mixture includes at least M, O, Including three elements of C, there is a point that satisfies 0.6 ≦ M / O ≦ 5 (molar ratio) and 0.002 ≦ M / C ≦ 0.1 (molar ratio) simultaneously. |