Lithium nickel manganese cobalt based composite oxide powder for lithium secondary battery positive electrode material, method for producing the same, spray-dried powder, positive electrode for lithium secondary battery and lithium secondary battery using the same

摘要

PPROBLEM TO BE SOLVED: To provide a lithium-nickel-manganese-cobalt-based composite powder for a positive electrode material of a lithium secondary battery, which can simultaneously achieve improvement of load characteristics such as rate/output characteristics, cost reduction, resistance to high voltage, and high safety. PSOLUTION: This lithium-nickel-manganese-cobalt-based composite powder for a positive electrode material of a lithium rechargeable battery is represented by the following composition formula (I), formed by including a crystalline structure belonging to a layered structure, wherein, in powder X-ray diffraction measurement using a CuK-ray, when it is assumed that the half-value width of the (110) diffraction peak where a diffraction angle 2 is present around 64.5 is FWHM(110), 0.01FWHM(110)0.2 is satisfied. Li[LiSBz/(2+z)/SBä(NiSB(1+y)/2/SBMnSB(1-y)/2/SB)SB1-x/SBCoSBx/SB}SB2/(2+z)/SB]OSB2/SB...(I), where 0x0.1, -0.1y0.1, and (1-x)(0.05-0.98y)z(1-x)(0.15-0.88y). PCOPYRIGHT: (C)2008,JPO&INPIT