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Abstract

Provided is a lithium titanate powder for an electrode of an energy storage device, an active material containing the same, and an energy storage device using the active material. The lithium titanate powder comprises Li₄Ti₅O₁₂ as a main component, and wherein, when a volume surface diameter calculated from specific surface area determined by the BET method is D_BET and a crystallite diameter calculated from half-peak width of (111) plane of Li₄Ti₅O₁₂ by the Scherrer equation is D_X, D_BET is 0.1 to 0.6 μm; D_X is larger than 80 nm; D_BET/D_X (μm/μm), ratio of D_BET to D_X, is 3 or less; M (wherein M is at least one type of metal element selected from a group consisting of Mg, Zn, Al, Ga, and In) is contained; and when atomic concentrations of the M and titanium at 5 nm inner positions from a surface of a lithium titanate particle are D1 (atm %) and Dti (atm %) respectively, and when atomic concentration of the M at 100 nm inner position from the lithium titanate particle surface is D2 (atm %), following formulas (I) and (II) are satisfied.

description='In-line Formulae' end='lead'D1/D2≧5  (I)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'0.02≦D1/Dti≦0.4  (II)description='In-line Formulae' end='tail'

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First Claim