Positive electrode material and secondary battery using the same
AssigneesToyota Jidosha Kabushiki Kaisha, National University Corporation Okayama University
InventorsDaisuke Horikawa, Ryuta Sugiura, Takashi Teranishi
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Abstract
According to an aspect of the present invention, there is provided a positive electrode material which contains a positive electrode active material, and a dielectric material having a perovskite crystal structure. In the positive electrode material, in an X-ray diffraction pattern (vertical axis: diffraction intensity, horizontal axis: diffraction angle 2θ (rad)) obtained by X-ray diffraction measurement using a CuKα ray, a highest intensity peak which is a peak derived from the dielectric material and has the highest intensity is in a range satisfying 2θ=31° to 32°, and a half width x of the highest intensity peak satisfies the following expression: 0.22≤x≤0.33.
Claims5
A positive electrode material comprising:
- a positive electrode active material;
- and
- a dielectric material disposed on a surface of the positive electrode active material and having a perovskite crystal structure,
- wherein, in an X-ray diffraction pattern which is obtained by X-ray diffraction measurement using a CuKα ray and in which a vertical axis indicates a diffraction intensity, a horizontal axis indicates a diffraction angle 2θ, and a unit is rad, a highest intensity peak which is a peak derived from the dielectric material and has a highest intensity is in a range satisfying 2θ=31° to 32°, and a half width x of the highest intensity peak satisfies the following expression:
- 0.22≤x≤0.33, and
- wherein the dielectric material is BaTiO3 with a BaTiO3-6 crystal structure, wherein δ is a positive number satisfying 0.1 δ 0.3.
Dependencies are inferred from the claim text.