METHOD OF PRODUCING NITRIDED LI-TI COMPOUND OXIDE, NITRIDED LI-TI COMPOUND OXIDE, AND LITHIUM-ION BATTERY

• US 20100297505A1
• Filed: 05/21/2010
• Published: 11/25/2010
• Est. Priority Date: 05/21/2009
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Oki, Hideki, Seguchi, Toshihiro
• Application Number:
  US12/784,926
• Publication Number:
  US 20100297505A1
• Time in Patent Office: Days
• US Class Current: 429/231.95
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 4/58 of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

Provided is a method of producing a nitrided Li—Ti compound oxide, including: preparing a raw material composite that has a raw material containing lithium, titanium, and oxygen and a nitriding agent that is expressed by a following General Formula (1) and is solid or liquid at room temperature (25° C.); and synthesizing the nitrided Li—Ti compound oxide by firing the raw material composite to nitride the raw material.

R₁, R₂, and R₃ are independent of each other and are each a functional group having at least one of carbon (C), hydrogen (H), oxygen (O), and nitrogen (N).

Claims

1. A method of producing a nitrided Li—

Ti compound oxide, comprising;

preparing a raw material composite that has a raw material containing lithium, titanium, and oxygen and a nitriding agent that is expressed by a following General Formula (1) and is solid or liquid at room temperature (25°

C.); and

synthesizing the nitrided Li—

Ti compound oxide by firing the raw material composite to nitride the raw material,

2. The method according to claim 1, wherein the raw material is a Li—

Ti compound oxide.

3. The method according to claim 2, wherein the Li—

Ti compound oxide is a compound that is expressed by Li_aTi_bO_c, (0<

a≦

5, 3≦

b≦

7, 10≦

c≦

14).

4. The method according to claim 3, wherein the raw material is Li₄Ti₅O₁₂.

5. The method according to claim 1, wherein the nitriding agent is urea.

6. The method according to claim 1, wherein a firing temperature in the synthesizing is within a range of 100°

C. to 800°

C.

7. The method according to claim 6, wherein the firing temperature in the synthesizing is within a range of 300°

C. to 600°

C.

8. The method according to claim 1, wherein a firing time in the synthesizing is within a range of 10 minutes to 7 hours.

19. The nitrided Li—

Ti compound oxide according to claim 9, wherein the nitrided Li—

Ti compound oxide is obtained by the method according to claim 1.

9. A nitrided Li—

Ti compound oxide comprising lithium, titanium, oxygen, and nitrogen, wherein the nitrided Li—

Ti compound oxide is crystalline.

10. The nitrided Li—

Ti compound oxide according to claim 9, wherein the nitrided Li—

Ti compound oxide is a compound that is expressed by Li_aTi_bO_cN_d (0<

a≦

5, 3≦

b≦

7, 11≦

c≦

14, 0.01≦

d≦

1).

11. The nitrided Li—

Ti compound oxide according to claim 9, wherein nitrogen is present in an inside of the nitrided Li—

Ti compound oxide.

15. The nitrided Li—

Ti compound oxide according to claim 9, wherein the nitrided Li—

Ti compound oxide is particulate.

16. The nitrided Li—

Ti compound oxide according to claim 15, wherein an average particle size is within a range of 100 nm to 100 μ

m.

17. The nitrided Li—

Ti compound oxide according to claim 15, wherein a specific surface area is within a range of 0.1 m²/g to 300 m²/g

18. The nitrided Li—

Ti compound oxide according to claim 9, wherein the nitrided Li—

Ti compound oxide is used as a negative electrode active material.

20. A lithium-ion battery comprising:

a positive electrode active material layer containing a positive electrode active material;

a negative electrode active material layer containing a negative electrode active material; and

an electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer,

wherein the negative electrode active material is the nitrided Li—

Ti compound oxide according to claim 9.

21. The lithium-ion battery according to claim 20, wherein the electrolyte layer is a liquid electrolyte layer or a solid electrolyte layer.

12. A nitrided Li—

Ti compound oxide comprising lithium, titanium, oxygen, and nitrogen, wherein the nitrided Li—

Ti compound oxide is expressed by Li_aTi_bO_cN_d (0<

a≦

5, 3≦

b≦

7, 11≦

c≦

14, 0.01≦

d≦

1).

13. The nitrided Li—

Ti compound oxide according to claim 12, wherein the nitrogen is present in an inside of the nitrided Li—

Ti compound oxide.

14. A nitrided Li—

Ti compound oxide comprising lithium, titanium, oxygen, and nitrogen, wherein the nitrogen is present in an inside of the nitrided Li—

Ti compound oxide.