Active material, electrode, secondary battery, battery pack, and vehicle
AssigneeKabushiki Kaisha Toshiba
InventorsYasuhiro Harada, Yoshiaki Murata, Kazuki Ise, Norio Takami
Life of this patent
Estimating the term…
Abstract
According to one embodiment, provided is an active material including a crystal particle that includes a niobium-titanium composite oxide. A ratio ANb/ATi of a Nb abundance ANb to a Ti abundance ATi in the crystal particle satisfies 2.3≤ANb/ATi≤4.0. According to a powder X-ray diffraction spectrum using a Cu-Kα ray for the crystal particle, an intensity ratio Iβ/Iα of a peak intensity Iβ of a peak β appearing at 12.5°≤2θ≤13.0° to a peak intensity Iα of a peak α appearing at 8.5°≤2θ≤9.0° is within a range of 0.1<Iβ/Iα≤2.0.
Claims12
An active material comprising a crystal particle, the crystal particle comprising a niobium-titanium composite oxide,
- the crystal particle comprising an A-type niobium-titanium composite oxide phase and a B-type niobium-titanium composite oxide phase in a state of distribution where a boundary is not observed within a primary particle of the active material, and where the A-type niobium-titanium composite oxide phase and the B-type niobium-titanium composite oxide phase are homogenized at a molecular level within the crystal particle,
- a ratio ANb/ATi of a Nb abundance ANb to a Ti abundance ATi in the crystal particle satisfying 2.3≤ANb/ATi≤4.0, and
- according to a powder X-ray diffraction spectrum using a Cu-Kα ray for the crystal particle, an intensity ratio Iβ/Iα of a peak intensity Iβ of a peak β appearing at 12.5°≤2θ≤13.0° attributed to the B-type niobium-titanium composite oxide phase to a peak intensity Iα of a peak α appearing at 8.5°<2θ≤9.0° attributed to the A-type niobium-titanium composite oxide phase is within a range of 0.1<Iβ/Iα≤2.0.
Dependencies are inferred from the claim text.