Patent ID: 8728342
Filing Date: 2014-05-20
Classification: C01G,C01P,H01M,Y02E,Y10T

Abstract:
1. A cathode active material plate-like particle for a lithium secondary battery, the particle being in a polycrystalline form composed of numerous primary crystal grains having a layered rock salt structure, comprising: when t represents the thickness of the particle, d represents the size of the particle as measured in a direction orthogonal to the thickness direction which defines the thickness, and d/t represents an aspect ratio, the following relations: t≦30 μm and d/t≧2 are satisfied; lithium-intercalation-deintercalation-plane-oriented grains, which are primary crystal grains whose (003) plane is oriented so as to intersect a plate surface of the plate-like particle, are present in a dispersed state among numerous (003)-plane-oriented grains, which are primary crystal grains whose (003) plane is oriented in parallel with the plate surface of the plate-like particle; and the peak intensity ratio [003]/[104], which is the ratio of intensity of diffraction by the (003) plane to intensity of diffraction by the (104) plane, as obtained through X-ray diffractometry, is 10 to 100.