POSITIVE ELECTRODE ACTIVE MATERIAL FOR NON-AQUEOUS SECONDARY BATTERY AND NON-AQUEOUS LITHIUM SECONDARY BATTERY

摘要

A lithium secondary battery (10) includes a positive electrode active material of lithium transition metal oxide which contains at least a nickel element and a manganese element as transition metals and for which, with respect to a diffraction peak A located at a diffraction angle 20 of 17° to 20° and a diffraction peak B located at a diffraction angle 2Θ of 43° to 46° from X-ray diffraction measurements, when the integrated intensity ratio is R1=IA/IB, the peak intensity ratio is RH=HA/HB, and the ratio between the integrated intensity ratio R1 and the peak intensity ratio RH is SF=RH/R1>> the SF satisfies 1.1≦SF≦2.2.

主权项

1. A positive electrode active material for a non-aqueous secondary battery, comprising:
a crystal particle of lithium transition metal oxide containing at least a nickel element and a manganese element as transition metals, and having a layered structure, wherein with respect to a first diffraction peak located at a diffraction angle 2θ of 17° to 20° and a second diffraction peak located at a diffraction angle 2θ of 43° to 46° when an X-ray diffraction measurement is performed on a crystal structure of the crystal particle using a Cu tube, when a first integrated intensity of the first diffraction peak is defined as IA, a second integrated intensity of the second diffraction peak is defined as IB, an integrated intensity ratio between the first integrated intensity and the second integrated intensity is defined as R1, a first height of the first diffraction peak is defined as HA, a second height of the second diffraction peak is defined as HB, and a peak intensity ratio between the first height and the second height is defined as RH, the following relationships are satisfied:
Ri=IA/IB RH=HA/HB SF=RH/RI, and1.1 respectively, the following relationships are satisfied:
RL=LH/LW, and1.3