Tdk Corporation

Junpei Shitaba

Hideaki Seki

Masahiro Tsuchiya

Hiroyuki Miyabara

A positive electrode active material for a lithium ion secondary battery is lithium vanadium phosphate represented by a following composition expression (1) and in which a peak intensity ((002)/(201)) of a (002) plane normalized with respect to a peak intensity of a (201) plane and a peak intensity ((102)/(201)) of a (102) plane normalized with respect to a peak intensity of the (201) plane in an X-ray diffraction pattern satisfy 0.35&#x2264;(002)/(201)&#x2264;0.53 and 0.46&#x2264;(102)/(201)&#x2264;0.63, respectively, LiVOPO. . . (1).

Positive electrode active material for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and lithium ion secondary battery using the same

A positive electrode active material for lithium ion secondary battery includes: active material particles including one or more compounds including Li and a transition metal; and a coating layer coating at least a part of a surface of the active material particles. The coating layer includes at least one of graphene or multilayer graphene The coating layer has a Raman spectrum with a G band (a peak of 1530 cmto 1630 cm), a D band (a peak of 1300 cmto 1400 cm), and a 2D band (a peak of 2650 cmto 2750 cm). At least the intensity of the 2D band normalized by the intensity of the G band (2D/G) satisfies 0.05&#x2264;2D/G.

Positive electrode active material including lithium transition metal particles with graphene coating layer positive electrode and lithium ion secondary battery including the same

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Tokyo, Japan

Junpei Shitaba