Positive-electrode materials: methods for their preparation and use in lithium secondary batteries

Patent metadata

Field	Value
Publication number	US-2018287155-A1
Application number	US-201815997910-A
Country	US
Kind code	A1
Filing date	Jun 5, 2018
Priority date	Oct 4, 2011
Publication date	Oct 4, 2018
Grant date	—

Abstract

A positive-electrode material for a lithium secondary battery. 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.

First claim

1 . A method of preparing a positive-electrode material for a lithium secondary battery, comprising:
(a) providing a lithium oxide compound as reactive substance; (b) coating the reactive substance particles surface with a carbon material; and (c) mixing the coated reactive substance with carbon black, a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length, and optionally a binder, wherein step (c) is performed by compression shear impact-type particle-compositing technique.

2 . A method of preparing a positive-electrode material for a lithium secondary battery, comprising:
(a) providing a complex oxide compound as reactive substance; (b) coating the reactive substance particles surface with a carbon material; and (c) mixing the coated reactive substance with carbon black, a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length, and optionally a binder, wherein step (c) is performed by compression shear impact-type particle-compositing technique, wherein the complex oxide compound is a complex oxide of general formula A a M m Z z O o N n F f , and wherein:
A represents an alkaline metal;
M represents a transition metal, and optionally at least one non-transition metal, or a mixture thereof;
Z represents a non-metallic element;
N is a nitrogen atom;
F is a fluorine atom; and
a≥0, m≥0, z≥0, o>0, n≥0 and f≥0, a, m, o, n, f and z being selected to ensure electro neutrality of the complex oxide.

3 . A method according to claim, further comprising (d) calcining the mixture obtained in step (c).

4 . A method according to claim 1 , wherein step (d) is performed at a temperature of about 700 to 850° C.

5 . A method according to claim 1 , wherein step (d) is performed during a period of time of about 0.5 to 2 hours.

6 . A method according to claim 1 , wherein step (d) is performed under inert atmosphere.

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

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

9 . A method according to claim 1 , wherein the lithium oxide is LiFePO4, LiMnPO4, LiFeSiO4, SiO, SiO2 or SiOx (0≤x<2).

10 . A method according to claim 1 , wherein the lithium oxide compound is a lithium phosphate.

11 . A method according to claim 2 , further comprising (d) calcining the mixture obtained in step (c).

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

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

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

15 . A method according to claim 2 , wherein:
A is Li; M is Fe, Mn, V, Ti, Mo, Nb, W, Zn or a mixture thereof; and Z is P, S, Se, As, Si, Ge, B or a mixture thereof.

Assignees

• Hydro Quebec
• Sei Corp

Inventors

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

Classifications

• H01M4/136

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

• H01M10/052

  Li-accumulators · CPC title

• H01M4/0471 Primary

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/5825 Primary

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

• H01M4/1397

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