Abstract: A problem to be solved is to provide a metal powder having a variety of excellent performances, and, in order to solve such a problem, the present invention provides a metal powder that is composed of many spherical particles; that includes at least one of Ni, Fe, and Co, in which the total content (T.C.) of the Ni, the Fe, and the Co is 50 mass % or more; that has a cumulative 10 vol % particle size D10 of 1.0 ?m or more; and in which a value Y is 7.5 to 24.0 as calculated by the following mathematical equation: Y=D50×?×S, where D50 represents a cumulative 50 vol % particle size of the powder, ? represents a true density of the powder, and S represents a specific surface area of the powder.

Abstract: A problem to be solved is to provide a metal powder having a variety of excellent performances, and, in order to solve such a problem, the present invention provides a metal powder that is composed of many spherical particles; that includes at least one of Ni, Fe, and Co, in which the total content (T.C.) of the Ni, the Fe, and the Co is 50 mass % or more; that has a cumulative 10 vol % particle size D10 of 1.0 ?m or more; and in which a value Y is 7.5 to 24.0 as calculated by the following mathematical equation: Y=D50×?×S, where D50 represents a cumulative 50 vol % particle size of the powder, ? represents a true density of the powder, and S represents a specific surface area of the powder.

Abstract: Disclosed is a Si-based alloy anode material for lithium ion secondary batteries, including an alloy phase with a Si principal phase including Si and a compound phase including two or more elements, which includes a first additional element A selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb and Mg and a low-melting second additional element B selected from S, Se, Te, Sn, In, Ga, Pb, Bi, Zn, Al. This compound phase includes (i) a first compound phase including Si and the first additional element A; a second compound phase including the first additional element A and the second additional element B; and one or both of a third compound phase including two or more of the second additional elements B and a single phase of the second additional element B.

Abstract: Disclosed is a Si-based alloy anode material for lithium ion secondary batteries, including an alloy phase with a Si principal phase including Si and a compound phase including two or more elements, which includes a first additional element A selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb and Mg and a low-melting second additional element B selected from S, Se, Te, Sn, In, Ga, Pb, Bi, Zn, Al. This compound phase includes (i) a first compound phase including Si and the first additional element A; a second compound phase including the first additional element A and the second additional element B; and one or both of a third compound phase including two or more of the second additional elements B and a single phase of the second additional element B.