Methods for the preparation and use of positive electrode materials coated with carbon in lithium secondary batteries

Patent metadata

Field	Value
Publication number	US-10944107-B2
Application number	US-201815997910-A
Country	US
Kind code	B2
Filing date	Jun 5, 2018
Priority date	Oct 4, 2011
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

A positive-electrode material for a lithium secondary battery is provided. The material includes a lithium oxide compound or a complex oxide as reactive substance. The material also includes at least one type of carbon material, and optionally a binder. A first type of carbon material is provided as a coating on the reactive substance particles surface. A second type of carbon material is carbon black. And a third type of carbon material is a fibrous carbon material provided as a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length. Also, a method for preparing the material as well as lithium secondary batteries including the material is provided.

First claim

The invention claimed is:

1. A method of preparing a positive-electrode material for a lithium secondary battery, comprising:
(a) providing a lithium oxide compound as a reactive substance;
(b) coating a surface of particles of the reactive substance with a carbon material, wherein the carbon material is a graphene form or an amorphous form; and
(c) mixing the coated reactive substance with carbon black, a mixture of at least a first fibrous carbon material and a second fibrous carbon material, the second fibrous carbon material being different in fiber diameter and/or fiber length from the first fibrous carbon material, and optionally a binder, wherein step (c) is performed by compression shear impact particle-compositing technique, and wherein the first and second fibrous carbon materials are a carbon nanotube, a carbon nanofiber or a combination thereof.

2. The method according to claim 1 , further comprising (d) calcining a mixture obtained in step (c).

3. The method according to claim 2 , wherein step (d) is performed at a temperature of about 700 to 850° C.

4. The method according to claim 2 , wherein step (d) is performed during a period of time of about 0.5 to 2 hours.

5. The method according to claim 2 , wherein step (d) is performed under inert atmosphere.

6. The method according to claim 1 , wherein the lithium oxide compound comprises a metal which is a transition metal.

7. The method according to claim 1 , wherein the lithium oxide compound is a phosphate, an oxyphosphate, a silicate, an oxysilicate, or a fluorophosphate.

8. The method according to claim 1 , wherein the lithium oxide compound is LiFePO 4 , LiMnPO 4 , LiFeSiO 4 , SiO, SiO 2 or SiO x (0≤x<2).

9. The method according to claim 1 , wherein the lithium oxide compound is a lithium phosphate.

10. The method according to claim 6 , wherein the transition metal is Fe, Mn, V, Ti, Mo, Nb, W, Zn or a mixture thereof.

11. The method according to claim 6 , wherein the transition metal is Fe.

12. The method according to claim 7 , wherein the lithium oxide compound is LiFePO 4 .

13. A method of preparing a positive-electrode material for a lithium secondary battery, comprising:
(a) providing a lithium oxide compound as a reactive substance;
(b) coating a surface of particles of the reactive substance with a carbon material; and
(c) mixing the coated reactive substance with carbon black, a mixture of at least a first fibrous carbon material and a second fibrous carbon material, the second fibrous carbon material being different in fiber diameter and/or fiber length from the first fibrous carbon material, and optionally a binder, wherein step (c) is performed by compression shear impact particle-compositing technique, wherein the first fibrous carbon material has fiber diameters of about 5 to 15 nm and fiber lengths of about 1 to 3 μm, and wherein the second fibrous carbon material has fiber diameters of about 70 to 150 nm and fiber lengths of about 5 to 10 μm.

Assignees

• Hydro Quebec
• Sei Corp

Inventors

• Zaghib Karim
• Guerfi Abdelbast
• Hovington Pierre
• Sawai Takehiko
• Saito Shinji
• Urao Kazunori

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/5825 Primary

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