Nonaqueous electrolyte secondary cell and a tungsten or molybdenum substituted lithium positive electrode active material

摘要

A positive active material for nonaqueous electrolyte secondary batteries which has a higher capacity and improved thermal stability in a charged state and is less expensive compared to the current active material of LiCoO2 is provided by a lithium compound oxide having the formula:where M stands for one or two of W and Mo,the lithium compound oxide giving an X-ray diffraction pattern including a diffraction peak or peaks assigned to a compound oxide of Li and W and/or a compound oxide of Li and Mo, in addition to main diffraction peaks assigned to a hexagonal crystal structure.