ACTIVE MATERIAL AND MANUFACTURING METHOD THEREOF, NONAQUEOUS ELECTROLYTE BATTERY AND BATTERY PACK

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte battery with an improved cycle life, an active material used for the battery and a manufacturing method thereof, and a battery pack.SOLUTION: An active material comprises a titanium oxide compound having a crystal structure of monoclinic titanium dioxide and satisfies the formula I: S/(S+S)≤1.9 (I). In the formula, the Sis a peak area of a peak present in a region of 1430 cmto 1460 cmin an infrared diffuse reflection spectrum of the active material after adsorption and desorption of pyridine; the Sis a peak area of a peak present in a region of 1470 cmto 1500 cmin the infrared diffuse reflection spectrum; and the Sis a peak area of a peak present in a region of 1520 cmto 1560 cmin the infrared diffuse reflection spectrum.