| 摘要 |
According to an embodiment, a method of manufacturing an active material is provided. The active material includes particles of a composite oxide of the general formula Ti 1±x Nb 2±y M z O 7-´ and a carbon-including phase. Here, 0 ‰¤ x ‰¤ 0.15, 0 ‰¤ y ‰¤ 0.3, 0.01 < z ‰¤ 0.2, and 0 < ´ < 0.3. M is at least one of Mg, Fe, Ni, Co, W, Ta, and Mo. The manufacturing method includes preparing a mixture by mixing in a liquid, a compound including Ti, a compound including Nb, a carbon source, and a compound including an element M, obtaining a precursor from the mixture, and calcining the precursor. The calcination is performed in a mixed atmosphere including nitrogen and oxygen, or argon and oxygen, with an oxygen concentration of 5% to 15%. |
