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Yang Jun

Yasuo Takeda

A lithium secondary battery includes a negative electrode active material. The negative electrode active material includes a primary active material and a secondary active material. The primary active material is at least one member selected from the group consisting of carbonaceous materials, Sn, Sn alloys, Sn oxides, Al, Al alloys, Pb, Pb alloys, Si and Si oxides. The secondary active material includes a lithium nitride expressed by a composition formula, Li M N, in which &ldquo;M&rdquo; is at least one element selected from the group consisting of transition metals and &ldquo;x&rdquo; is 0<&ldquo;x&rdquo;&lE;0.7. In the lithium secondary battery, the negative electrode retention is relieved efficiently, the capacity is less likely to change suddenly, and the wasting of a positive electrode material is less.

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Tsu, Japan

Yang Jun