Nissan Motor Company Limited

Kei Kitaura

Manabu Watanabe

Nobutaka Chiba

Tohru Wada

Fumihiro Miki

A negative electrode active material having high cycle durability contains an alloy represented by the following chemical formula (1):SiSnMA&#x2003;&#x2003;(1)wherein M is Zn, A is unavoidable impurities, x, y, z, and a represent % by mass values, and in that case, 0&#x3c;x&#x3c;100, 0&#x3c;y&#x3c;100, 0&#x3c;z&#x3c;100, 0&#x2264;a&#x3c;0.5, and x+y+z+a=100, in which the half width of the diffraction peak of the (111) surface of Si in the range of 2&#x3b8;=24 to 33&#xb0; by X ray diffraction measurement of the alloy using CuK&#x3b1; ray is 0.7&#xb0; or more, and the x is more than 23 and less than 64, the y is 4 or more and less than 34, and the z is more than 0 and less than 65.

Negative electrode active material for electrical device

A negative electrode active material having high cycle durability contains an alloy represented by the following chemical formula (1):SiSnMA&#x2003;&#x2003;(1)(in the chemical formula (1), M is at least one metal selected from the group consisting of Ti, Zn, C, and combinations thereof, A is unavoidable impurities, x, y, z, and a represent % by mass values, and in that case, 0&#x3c;x&#x3c;100, 0&#x3c;y&#x3c;100, 0&#x3c;z&#x3c;100, 0&#x2264;a&#x3c;0.5, and x+y+z+a=100), in which the half width of the diffraction peak of the (111) surface of Si in the range of 2&#x3b8;=24 to 33&#xb0; by X ray diffraction measurement of the alloy using the CuK&#x3b1; ray is 0.7&#xb0; or more.

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Kanagawa, Japan

Kei Kitaura