Method for producing iron oxyfluoride positive electrode active substance and iron oxyflouride positive electrode active substance

Patent metadata

Field	Value
Publication number	US-9312538-B2
Application number	US-201214128470-A
Country	US
Kind code	B2
Filing date	Jun 22, 2012
Priority date	Jun 22, 2011
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

Provided is a technology for producing a positive electrode active substance mainly composed of FeOF having a sufficient charge-discharge capacity, in the short-time and easy manner. Also provided is a positive electrode active substance mainly composed of FeOF. The method for producing the positive electrode active substance mainly composed of FeOF comprises the steps of admixing iron oxide Fe 2 O 3 and iron fluoride FeF 3 both in solid states, and melt-quenching the mixture in an atmosphere of inert gas. The positive electrode active substance mainly composed of FeOF is composed of not less than 50% by weight of FeOF with a remainder being iron fluoride FeF 3 and/or iron oxide Fe 2 O 3 .

First claim

What is claimed is:

1. A method of producing a positive electrode active substance comprising mainly FeOF, which comprises the steps of admixing iron oxide Fe 2 O 3 and iron fluoride FeF 3 both in solid states, and melt-quenching the mixture in an atmosphere of inert gas, wherein in the melt-quenching, the iron oxide is melted, and the molten mixture is quenched.

2. The method of producing the positive electrode active substance as claimed in claim 1 , wherein the melt-quenching is carried out by high-frequency induction heating and roll quenching, and wherein the molar ratio of iron fluoride FeF 3 to iron oxide Fe 2 O 3 is not less than 1 and not more than 10.

3. A positive electrode active substance consisting of 50% to 99% by weight of FeOF with a remainder being only iron fluoride FeF 3 .

4. A positive electrode active substance consisting of 50% to 99% by weight of FeOF with a remainder being iron fluoride FeF 3 and/or iron oxide Fe 2 O 3 , and wherein the FeOF has a lattice constant c=3.09-3.14 Å with tetragonal rutile structure.

5. The positive electrode active substance as claimed in claim 4 , wherein the substance consists of 50% to 99% by weight of FeOF with the remainder being only iron fluoride FeF 3 .

6. The positive electrode active substance as claimed in claim 3 , wherein, when measured by X-ray diffraction method using CuKα radiation, the diffraction peak height ratio of (110) plane to (101) plane of FeOF is not less than 2.6.

7. The positive electrode active substance as claimed in claim 4 , wherein, when measured by X-ray diffraction method using CuKα radiation, the diffraction peak height ratio of (110) plane to (101) plane of FeOF is not less than 2.6.

8. The method of producing the positive electrode active substance as claimed in claim 2 wherein the substance is not less than 60% by weight FeOF.

9. The method of producing the positive electrode active substance as claimed in claim 2 , wherein a molar ratio of iron fluoride FeF 3 : iron oxide Fe 2 O 3 in the admixture exceeds 1.86:1.

10. A positive electrode active substance produced by the method of claim 1 .

11. An electrode comprising the positive electrode active substance of claim 10 .

Assignees

• Okada Shigeto
• KITAJOU Ayuko
• Komatsu Hideyuki
• Gocheva Irina D
• CHIHARA Kuniko
• Yamaki Junichi
• Univ Kyushu Nat Univ Corp

Inventors

• Okada Shigeto
• KITAJOU Ayuko
• Komatsu Hideyuki
• Gocheva Irina D
• CHIHARA Kuniko
• Yamaki Junichi

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title

• C01G49/06

  Ferric oxide [Fe2O3] · CPC title

• H01M4/523 Primary

  for non-aqueous cells (H01M4/525 takes precedence) · CPC title

• C01B11/24 Primary

  Oxygen compounds of fluorine · CPC title