1. A cathode active material for a lithium ion secondary battery, the cathode active material comprising a lithium transition metal-containing oxide configured by secondary particles each formed of a plurality of primary particles, wherein lanthanum compound particles each having a perovskite-type structure are dispersed on surfaces of the secondary particles and/or in gaps or grain boundaries between the primary particles, and the lanthanum compound particles have a cross-sectional average particle size of 0.70 μm or less.
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