abstract |
A negative electrode active material contains a metal-displaced lithium-titanium oxide of a ramsdellite structure expressed by the formula Li (16/7)−x Ti (24/7)−y M y O 8 (where M is at least one metal element selected from the group consisting of Nb, Ta, Mo, and W, and x and y are respectively numbers in the range of 0<x<16/7 and 0<y<24/7). |