Active material, nonaqueous electrolyte battery, battery pack, and method of producing active material
AssigneeKabushiki Kaisha Toshiba
InventorsKazuki Ise, Yorikazu Yoshida, Yasuhiro Harada, Hiroki Inagaki, Norio Takami
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Abstract
According to one embodiment, an active material containing a niobium titanium composite oxide is provided. The niobium titanium composite oxide has average composition represented by LiyNb2+xTi1−xO7+0.5x (0≤x≤0.5, 0≤y≤5.5). The niobium titanium composite oxide satisfies peak intensity ratios represented by the following formulae (1) to (3): 0.05≤(B/A)≤0.7 (1) 0.01≤(C/A)≤0.2 (2) 0≤(D/A)≤0.1 (3).
Claims20
An active material comprising a niobium titanium composite oxide whose average composition is represented by LiyNb2+xTi1−xO7+0.5x (0≤x≤0.5, 0≤y≤5.5) and which satisfies peak intensity ratios represented by the following formulae (1) to (3):
- 0.05≤(B/A)≤0.7 (1)
- 0.01≤(C/A)≤0.2 (2)
- 0≤(D/A)≤0.1 (3)
- wherein A is an intensity of a peak derived from Nb2TiO7 at 2θ of 26.0±0.1° in a wide angle X-ray diffraction pattern using CuKα rays as an X-ray source, B is an intensity of a peak derived from Nb10Ti2O29 at 2θ of 25.0±0.1° in the wide angle X-ray diffraction pattern, C is an intensity of a peak derived from Nb24TiO62 at 2θ of 24.8±0.1° in the wide angle X-ray diffraction pattern, and D is an intensity of a peak derived from a TiO2 rutile phase at 2θ of 27.4±0.2° in the wide angle X-ray diffraction pattern.
Dependencies are inferred from the claim text.