| 摘要 |
An active material for a battery contains a Y2Ti2O5S2 crystalline phase, and has an IB/IA value of 0.3 or smaller and an IC/IA value of 0.15 or smaller, wherein IA, IC and IC are the peak intensity of the Y2Ti2O5S2 crystalline phase at 2θ=34.5°, the peak intensity of a Y2T2O7 crystalline phase at 2θ35.6°, and the peak intensity of TiS2 at 2θ=34.1°, respectively, that are measured by X-ray diffraction using CuKαradiation. The active material is synthesized by preparing a raw material composition containing TiS2, TiO2 and Y2O3 and having a molar ratio of TiS2 to Y2O3 of higher than 1 or containing TiS2, TiO2 and Y2O3 and having a molar ratio of TiO2 to Y2O3 of lower than 1, and heating the raw material composition. A positive or negative-electrode active material layer included in the battery may be contain the active material.
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