Negative electrode material for use in lithium secondary batteries, its manufacture, and lithium secondary batteries incorporating this material

摘要

A negative electrode material for use in lithium secondary batteries contains a negative electrode active material container made from an amorphous transition metal nitride containing lithium represented by the chemical formula Li1+xMyN, where M represents one or more elements selected from; a transition metal, group IIIA, group IVA, and group VA, and contains at least a transition metal, x is within the range from -0.2 to 2.0, and y is within the range from 0.1 to 0.6. A lithium secondary battery using this negative electrode material has a high energy density, a large charge-discharge capacity, and a long cycle life.