Positive active material for energy storage device, positive electrode for energy storage device, energy storage device, and energy storage apparatus

Patent metadata

Field	Value
Publication number	US-2024021794-A1
Application number	US-202118034913-A
Country	US
Kind code	A1
Filing date	Oct 4, 2021
Priority date	Nov 6, 2020
Publication date	Jan 18, 2024
Grant date	—

Abstract

In a positive active material for energy storage device according to an aspect of the present invention, at least part of a surface is coated with carbon, a ratio of full width at half maximum of a peak in a charged state to a peak in a discharged state is 0.85 or more and 1.13 or less in a peak corresponding to a (131) plane observed by powder X-ray diffraction using CuKα radiation, and the positive active material for energy storage device is a compound represented by the following Formula 1.
LiFe x Mn (1−x) PO 4 ( 0≤ x≤ 1 )    1

First claim

1 . A positive active material for energy storage device, wherein
at least part of a surface is coated with carbon, a ratio of full width at half maximum of a peak in a charged state to a peak in a discharged state is 0.85 or more and 1.13 or less in a peak corresponding to a (131) plane observed by powder X-ray diffraction using CuKα radiation, and the positive active material for energy storage device is a compound represented by the following Formula 1:
LiFe x Mn (1−x) PO 4 (0≤x≤1)   1.

2 . The positive active material for energy storage device according to claim 1 , wherein the ratio of full width at half maximum is 0.85 or more and 1.10 or less.

3 . A positive electrode for energy storage device, comprising a positive composite layer containing the positive active material according to claim 1 .

4 . The positive electrode for energy storage device according to claim 3 , wherein a peak differential pore volume of the positive composite layer is 5×10 −3 cm 3 /(g·nm) or more and 8×10 −3 cm 3 /(g·nm) or less.

5 . An energy storage device comprising the positive electrode according to claim 3 .

6 . An energy storage apparatus comprising two or more energy storage devices and one or more energy storage devices according to claim 5 .

Assignees

• Gs Yuasa Int Ltd

Inventors

• Endo Daisuke
• Otani Shinya
• Hoshino Satoshi

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title