Two-phase positive electrode material for a lithium battery and method for the synthesis of same

Patent metadata

Field	Value
Publication number	US-9359220-B2
Application number	US-201213978556-A
Country	US
Kind code	B2
Filing date	Jan 6, 2012
Priority date	Jan 7, 2011
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

A two-phase positive electrode material for a lithium battery in which particles of lithium-enriched layered oxide of formula Li 1+x (Mn a Ni b M c ) 1−x O 2 are at least partially coated on the surface with a metal oxide of formula Li y VO z . Such a material is advantageously produced by mixing the lithium-enriched lamellar oxide with at least one precursor of the metal oxide in aqueous solution, followed by thermal treatment at a temperature no lower than 280° C.

First claim

The invention claimed is:

1. A two-phase positive electrode material for a lithium battery consisting of:
particles of lithium-enriched layered oxide of formula Li 1+x (Mn a Ni b M c ) 1−x O 2 , and
a metal oxide of formula Li y VO z , covering at least a portion of a surface of the particles of lithium-enriched layered oxide,
wherein:
0.1≦x≦0.25,
a+b+c=1, with a, b and c being non-zero,
M is a metal selected from the group consisting of Mg, Zn, Al, Na, Ca and K,
0<y≦3, and
2.5<z<4.

2. The material of claim 1 , wherein the metal oxide is LiVO 3 .

3. The material of claim 1 , wherein the lithium-enriched layered oxide is Li 1.2 (Mn 0.7625 Ni 0.225 Mg 0.0125 ) 0.8 O 2 .

4. The material of claim 1 , wherein a percentage by weight of the metal oxide is between 5% and 15%, with respect to a total weight of the material.

5. The material of claim 1 , wherein the metal oxide is at least partially crystalline.

6. The material of claim 1 , wherein the metal oxide forms a coating with a thickness of between 3 nm and 15 nm at the surface of the particles of lithium-enriched layered oxide.

7. A process for producing the material of claim 1 , comprising:
mixing the lithium-enriched layered oxide with at least one precursor of the metal oxide placed in an aqueous solution, thereby obtaining a mixture, and
heat treating the mixture at a temperature of greater than or equal to 280° C., thereby obtaining the material.

8. The process of claim 7 , wherein the at least one precursor of the metal oxide is selected from the group consisting of NH 4 VO 3 and NaVO 3 .

9. The process of claim 7 , wherein the metal oxide is LiVO 3 .

10. The process of claim 7 , wherein the lithium-enriched layered oxide is obtained by a process comprising:
heat treating a pulverulent mixture comprising:
manganese carbonate,
nickel carbonate,
a compound comprising the metal M and selected from the group consisting of a carbonate, a sulfate and a nitrate, and
a lithium source selected from the group consisting of lithium carbonate and lithium hydroxide,
at a temperature of greater than or equal to 800° C., and
cooling the pulverulent mixture, thereby obtaining the lithium-enriched layered oxide.

11. The process of claim 10 , wherein the cooling occurs by quenching or with ambient air.

12. The process of claim 7 , wherein the lithium-enriched layered oxide is Li 1.2 (Mn 0.7625 Ni 0.225 Mg 0.0125 ) 0.8 O 2 .

13. A two-phase positive electrode material for a lithium battery comprising:
particles of lithium-enriched layered oxide of formula Li 1+x (Mn a Ni b M c ) 1−x O 2 , and
a metal oxide of formula Li y VO z , covering at least a portion of a surface of the particles of lithium-enriched layered oxide,
wherein:
0.1≦x≦0.25,
a+b+c=1, with a, b and c being non-zero,
M is a metal selected from the group consisting of Mg, Zn, Al, Na, Ca and K,
0<y≦3, and
2.5<z<4.

14. A lithium battery, comprising the two-phase positive electrode material of claim 1 .

15. A lithium battery, comprising the two-phase positive electrode material of claim 2 .

16. A lithium battery, comprising the two-phase positive electrode material of claim 3 .

17. A lithium battery, comprising the two-phase positive electrode material of claim 4 .

18. A lithium battery, comprising the two-phase positive electrode material of claim 5 .

19. A lithium battery, comprising the two-phase positive electrode material of claim 6 .

20. A lithium battery, comprising the two-phase positive electrode material of claim 13 .

Assignees

• Simonin Loic
• Bourbon Carole
• Daniel Lise
• Patoux Sebastien
• Renault Sas

Inventors

• Simonin Loic
• Bourbon Carole
• Daniel Lise
• Patoux Sebastien

Classifications

• C01D15/02 Primary

  Oxides; Hydroxides · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title