POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, METHOD FOR PRODUCTION THEREOF, AND LITHIUM SECONDARY BATTERY

摘要

There is provided a positive electrode active material for lithium secondary batteries which suppresses gelation when kneaded with a binder resin in producing a positive electrode material and provides excellent coating properties. The positive electrode active material for lithium secondary batteries comprises a lithium composite oxide represented by the following general formula (1) and a Ca atom contained in the lithium composite oxide. When the positive electrode active material is analyzed by X-ray diffraction using Cu- K± radiation as a radiation source, the intensity ratio (b/a) of (b) the diffraction peak at 2¸ = 18.7 ± 0.2° to (a) the diffraction peak at 2¸ = 37.4 ± 0.2° derived from CaO is from 10 to 150. Li x Ni 1-y-z Co y Me z O 2 (1) In the formula, Me represents a metal element having an atomic number of 11 or more other than Co and Ni; and x, y, and z are represented by the formulae 0.98 ‰¤ x ‰¤ 1.20, 0 < y ‰¤ 0.5, and 0 < z ‰¤ 0.5, respectively, provided that y + z < 1.