Positive electrode active material for lithium ion battery, method of producing the same, electrode for lithium ion battery, and lithium ion battery

Abstract

Provided is a positive electrode active material for lithium ion batteries, which may be in the form of fine particles with good crystallinity and high purity by suppressing grain growth, and which is capable of improving the charge and discharge capacity and high-rate characteristics, a production method thereof, an electrode for lithium ion batteries, and a lithium ion battery. The positive electrode active material for lithium ion batteries of the invention is a positive electrode active material for lithium ion batteries which are formed from LiMPO4 (provided that, M represents one or more kinds selected from a group consisting of Mn, Co, and Ni). In an X-ray diffraction pattern, a ratio I(020)/I(200) of the X-ray intensity I(020) of a (020) plane around a diffraction angle 2θ of 29° to the X-ray intensity 1(200) of a (200) plane around a diffraction angle 2θ of 17° is 3.00 to 5.00, and a specific surface area is 15 m2/g to 50 m2/g.

Dependencies are inferred from the claim text.