POSITIVE ELECTRODE MATERIAL AND SECONDARY BATTERY USING THE SAME

• US 20200136152A1
• Filed: 09/25/2019
• Published: 04/30/2020
• Est. Priority Date: 10/25/2018
• Status: Active Grant

• Current Assignee: National University Corporation Okayama University, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: HORIKAWA, Daisuke, SUGIURA, Ryuta, TERANISHI, Takashi
• Granted Patent: US 11,380,906 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 4/136 Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
• CPC Class Codes: H01M 4/362 Composites
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: H01M 4/9033 Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells

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.

Claims

1. 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.

2. The positive electrode material according to claim 1,

wherein the dielectric material is a compound which contains at least one of Sr, Ba, and La;

and Ti.

3. The positive electrode material according to claim 1,

wherein the dielectric material has an ABO_3-δ

crystal structure, wherein δ

is an oxygen deficiency amount, and a molar ratio of an element at an A site to an element at a B site is 0.920 or more and 0.993 or less.

4. The positive electrode material according to claim 1,

wherein the dielectric material has an ABO_3-δ

crystal structure, wherein δ

is a positive number satisfying 0.1≤

δ

≤

0.3.

5. The positive electrode material according to claim 1,

wherein, when a content of the positive electrode active material is 100 mol %, a content of the dielectric material is 0.01 mol % or more and 10 mol % or less.

6. A secondary battery comprising the positive electrode material according to claim 1 in a positive electrode.