Electrode active material, electrode, electrochemical device, module and method

Patent metadata

Field	Value
Publication number	US-2025006928-A1
Application number	US-202418819277-A
Country	US
Kind code	A1
Filing date	Aug 29, 2024
Priority date	Mar 3, 2022
Publication date	Jan 2, 2025
Grant date	—

Abstract

An electrode active material, an electrode, an electrochemical device, a module, and a method, each utilizing a fluoride ion reaction to improve the charge-discharge cycle performance, are provided. The electrode active material includes a carbon material. During discharge, a metal fluoride is generated. During charge, a fluoride ion is desorbed from the metal fluoride and reacts with the carbon material to form a C—F bond.

First claim

1 . An electrode active material comprising a carbon material, wherein the electrode active material is configured such that:
during discharge, a metal fluoride is generated; and during charge, a fluoride ion is desorbed from the metal fluoride and reacts with the carbon material to form a C—F bond, wherein the electrode active material has a surface fluorine index I of 0.30 or lower, the surface fluorine index I being a value represented by a ratio of a peak intensity after 100 seconds and a peak intensity after 0 seconds, where each peak intensity is an intensity of a peak assigned to CF 2 in C1s and is measured by X-ray photoelectron spectroscopy with argon ion etching at 10 mA and 0.5 kV.

2 . An electrode active material comprising:
a carbon material and a metal fluoride in a discharged state; and a C—F bond in a charged state, wherein the electrode active material has a surface fluorine index I of 0.30 or lower, the surface fluorine index I being a value represented by a ratio of a peak intensity after 100 seconds and a peak intensity after 0 seconds, where each peak intensity is an intensity of a peak assigned to CF 2 in C1s and is measured by X-ray photoelectron spectroscopy with argon ion etching at 10 mA and 0.5 kV.

3 . The electrode active material according to claim 1 , wherein carbon fluoride is formed during the charge, and the carbon fluoride is present in a charged state.

4 . An electrode comprising the electrode active material according to claim 1 .

5 . The electrode according to claim 4 , which serves as a positive electrode.

6 . An electrochemical device comprising the electrode according to claim 4 .

7 . The electrochemical device according to claim 6 , further comprising a counter electrode to the electrode, the counter electrode forms no bond with a fluoride ion during the charge and the discharge.

8 . The electrochemical device according to claim 6 , further comprising an electrolyte solution comprising a fluorine-containing compound.

9 . The electrochemical device according to claim 6 , wherein the electrode is a positive electrode.

10 . The electrochemical device according to claim 6 , further comprising a lithium storage material as a negative electrode.

11 . The electrochemical device according to claim 10 ,
wherein the lithium storage material comprises at least one selected from graphite, tin, silicon, silicon oxide, and lithium.

12 . The electrochemical device according to claim 6 , having an operating voltage of 4.9 V or higher.

13 . A module comprising the electrochemical device according to claim 6 .

14 . A method, comprising operating the electrochemical device according to claim 6 at a voltage of 4.9 V or higher.

15 . The electrode active material according to claim 2 , further comprising carbon fluoride which is present in a charged state.

16 . An electrode comprising the electrode active material according to claim 2 .

17 . An electrochemical device comprising the electrode according to claim 16 .

18 . The electrochemical device according to claim 17 , further comprising an electrolyte solution comprising a fluorine-containing compound.

19 . A module comprising the electrochemical device according to claim 17 .

20 . A method, comprising operating the electrochemical device according to claim 17 at a voltage of 4.9 V or higher.

Assignees

• Univ Kyoto
• Daikin Ind Ltd

Inventors

• Abe Takeshi
• Hiraga Kentaro
• Yamada Takaya
• Sugiyama Akinari
• Yamazaki Shigeaki

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2300/0034

  Fluorinated solvents · CPC title

• H01M4/5835 Primary

  Comprising fluorine or fluoride salts · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M2004/028

  Positive electrodes · CPC title