MANUFACTURE OF POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a battery that has high specific capacity density of initial discharge and shows high capacity. SOLUTION: This positive electrode active material is an orthorhombic system lithium-containing manganese oxide that mainly belongs to a space group Pm2m and is expressed by a formula LiMnO2 . A cubic system lithium-containing manganese oxide that belongs to a space group Fd3m and is expressed by a formula LiMn2 O4 is used as a positive electrode material 5 which has a precursor of a lithium composite manganese oxide which is expressed by a formula Lix Mn2 O4 (0.54<=x<=0.59) and at least the chemical shift of which has a peak in the vicinity of 37 ppm when LiCl as the standard substance is set to 0 ppm in the measurement of a solid NMR spectrum using a lithium nucleus, in particular, an MAS/spin-echo method (combined use of a magic angle rotation method [measurement frequency: 155 MHz; the number of rotation: 15.5 kHz] and a spin-echo method).