LITHIUM COMPOSITE COMPOUND PARTICLE POWDER, METHOD FOR PRODUCING SAME, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

The present invention aims to provide lithium composite compound particles which can exhibit good cycle characteristics and an excellent high-temperature storage property when used as a positive electrode active substance of a secondary battery, and a secondary battery using the lithium composite compound particles. The present invention relates to lithium composite compound particles having a composition represented by the compositional formula: LiNiCoMnMO, in which the lithium composite compound particles have an ionic strength ratio A (LiO/NiO- ) of not more than 0.5 and an ionic strength ratio B (LiCO+ /Ni) of not more than 20 as measured on a surface of the respective lithium composite compound particles using a time-of-flight secondary ion mass spectrometer.