ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery capable of achieving high safety, high in capacity, and excelling in electric characteristics such as a load characteristic and cycle life.

SOLUTION: This active material for this nonaqueous electrolyte secondary battery contains a lithium-containing transition metal oxide containing nickel and manganese, and having a closest packing structure of oxygen. In the active material, an atom ratio MLi/MTof the number MLiof moles of lithium to the number Mtof moles of the transition metal is larger than 1.0; the lithium-containing transition metal oxide has a crystalline structure belonging to hexagonal crystal; the X-ray diffraction image of the crystalline structure has a peak P003belonging to the (003) plane and a peak P104belonging to the (104) plane; the integral intensity ratio I003/I104of the peak P003to the peak P104reversibly changes in a region in the range of 0.7-1.5; and the change of the integral intensity ratio is linear and continuous.

COPYRIGHT: (C)2009,JPO&INPIT