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

Patent metadata

Field	Value
Publication number	US-2021066718-A1
Application number	US-202017096403-A
Country	US
Kind code	A1
Filing date	Nov 12, 2020
Priority date	Oct 4, 2011
Publication date	Mar 4, 2021
Grant date	—

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

1 . 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.

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

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

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

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

6 . A method according to claim 1 , 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

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02P70/50

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

• H01M4/043

  involving compressing or compaction · CPC title

• H01M4/0402

  Methods of deposition of the material · CPC title

• H01M4/0471 Primary

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