Active material for secondary battery

Patent metadata

Field	Value
Publication number	US-9356284-B2
Application number	US-201214130056-A
Country	US
Kind code	B2
Filing date	Jun 15, 2012
Priority date	Jul 13, 2011
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

An active material for a secondary battery whose lifetime characteristics are improved is provided. The active material for a secondary battery includes a first active material represented by Li p [M1 m M2 2-m-n M3 n ]O 4 , wherein M1 is at least one selected from Ni, Cr, Fe, Co, and Cu; M2 is at least one selected from Mn, Ti, and Si, and contains Mn; M3 is at least one selected from Li, B, Mg, Al, Na, and Ca; and 0≦p, 0<m, 0<n, and m+n<2; and a second active material represented by Li q [Li a X x Z z Mn 1-a-x-z ]O 2 , wherein X is at least one selected from Ni, Cr, Fe, Co, and Cu; Z is at least one selected from Al, Mg, B, Si, Na, Ca, and Ti; and 0≦q, 0<a, 0<x, 0≦z, and a+x+z<1.

First claim

The invention claimed is:

1. An active material for a secondary battery comprising:
a first active material represented by the following formula (I)
Li p [M1 m M2 2-m-n M3 n ]O 4   (I)

wherein, M1 is at least one selected from the group consisting of Ni, Cr, Fe, Co, and Cu; M2 is at least one selected from the group consisting of Mn, Ti, and Si, and comprises at least Mn; M3 is at least one selected from the group consisting of Li, B, Al; and 0≦p, 0<m, 0<n, and m+n<2; and
a second active material represented by the following formula (II)
Li q [Li a X x Z z Mn 1-a-x-z ]O 2   (II)

wherein, X is at least one selected from the group consisting of Ni, Cr, Fe, Co, and Cu; Z is at least one selected from the group consisting of Al, Mg, B, Si, Na, Ca, and Ti; and 0≦q, 0<a, 0<x, 0<z<0.3, and a+x+z<1.

2. The active material for a secondary battery according to claim 1 , wherein 0.4≦m<1.1 in the formula (I).

3. The active material for a secondary battery according to claim 1 , wherein 0<n≦0.1 in the formula (I).

4. The active material for a secondary battery according to claim 1 , wherein 0≦p≦2 in the formula (I).

5. The active material for a secondary battery according to claim 1 , wherein 0.1≦a≦0.3 in the formula (II).

6. The active material for a secondary battery according to claim 1 , wherein 0.1≦x<0.4 in the formula (II).

7. The active material for a secondary battery according to claim 1 , wherein 0.2≦a+x+z≦0.5 in the formula (II).

8. The active material for a secondary battery according to claim 1 , wherein 0≦q≦1 in the formula (II).

9. The active material for a secondary battery according to claim 1 , wherein M1 comprises at least Ni in the formula (I).

10. The active material for a secondary battery according to claim 1 , wherein X comprises at least Ni in the formula (II).

11. The active material for a secondary battery according to claim 1 , wherein the mass of the second active material to the total mass of the first active material and the second active material ranges from at least 3 mass % and up to 90 mass %.

12. The active material for a secondary battery according to claim 1 , which is a positive electrode.

13. An electrode for a secondary battery comprising the active material for a secondary battery according to claim 1 .

14. A secondary battery comprising the electrode for a secondary battery according to claim 13 .

15. The secondary battery according to claim 14 comprising:
a negative electrode comprising a negative electrode active material, wherein the negative electrode active material is at least one selected from the group consisting of graphite, SiO, Si, hard carbon, and Li 4 Ti 5 O 12 .

16. A method for producing an active material for a secondary battery comprising mixing a first active material represented by the following formula (I)
Li p [M1 m M2 2-m-n M3 n ]O 4   (I)

wherein, M1 is at least one selected from the group consisting of Ni, Cr, Fe, Co, and Cu; M2 is at least one selected from the group consisting of Mn, Ti, and Si, and comprises at least Mn; M3 is at least one selected from the group consisting of Li, B, Al; and 0≦p, 0<m, 0<n, and m+n<2; and
a second active material represented by the following formula (II)
Li q [Li a X x Z z Mn 1-a-x-z ]O 2   (II)

wherein, X is at least one selected from the group consisting of Ni, Cr, Fe, Co, and Cu; Z is at least one selected from the group consisting of Al, Mg, B, Si, Na, Ca, and Ti; and 0≦q, 0<a, 0<x, 0<z<0.3, and a+x+z<1.

17. The method according to claim 16 , wherein in formula (I): 0.4≦m<1.1; 0<n≦0.1; and 0≦p≦2.

18. The method according to claim 16 , wherein in formula (II): 0.1≦a≦0.3; 0.1≦x<0.4; 0.2≦a+x+z≦0.5; and 0≦q≦1.

19. The method according to claim 16 , wherein M1 comprises at least Ni in the formula (I) and X comprises at least Ni in the formula (II).

Assignees

• Noguchi Takehiro
• Sasaki Hideaki
• Uehara Makiko
• Katou Yuukou
• Nec Corp

Inventors

• Noguchi Takehiro
• Sasaki Hideaki
• Uehara Makiko
• Katou Yuukou

Classifications

• 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

• H01M4/485

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

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• Y02P70/54

  Cross-Sectional Technologies · mapped topic