Positive electrode active material for sodium-ion secondary cell
AssigneeNippon Electric Glass Co., Ltd.
InventorsKei TSUNODA, Hideo YAMAUCHI
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Abstract
Provided is a novel positive-electrode active material for a sodium-ion secondary battery having an excellent discharge capacity. A positive-electrode active material for a sodium-ion secondary battery is made of a crystallized glass containing crystals represented by a general formula Nax(Ni1−a−bMaM′b)yP2Oz (where M and M′ are transition metal elements different from each other and each at least one transition metal element selected from the group consisting of Co, Mn, Cr, Fe, and Ti, and 0.6≤x≤4, 0.3≤y≤2.7, 6≤z≤7.5, 0<a≤0.9, and 0<b≤0.9 are satisfied).
Claims12
A positive-electrode active material for a sodium-ion secondary battery, the positive-electrode active material being made of a crystallized glass containing crystals represented by a general formula Nax(Ni1−a−bMaM′b)yP2Oz (where M and M′ are transition metal elements different from each other and each at least one transition metal element selected from the group consisting of Co, Mn, Cr, Fe, and Ti, and 0.6≤x≤4, 0.3≤y≤2.7, 6≤z≤7.5, 0<a≤0.9, and 0<b≤0.9 are satisfied).
A positive-electrode active material precursor glass for a sodium-ion secondary battery, the positive-electrode active material precursor glass containing, in terms of % by mole of the following oxides, 8 to 55% Na2O, 1 to 70% NiO, over 0 to 60% CoO+MnO+CrO+FeO+TiO2 (where at least two selected from among CoO, MnO, CrO, FeO, and TiO2 are contained), and 15 to 70% P2O5.
Dependencies are inferred from the claim text.