Cathode active material, cathode, secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus

1. A secondary battery, comprising:

a cathode;

an anode; and

an electrolytic solution,

the cathode including a lithium-rich lithium-containing compound having a bedded salt crystal structure, and

a product SD of a specific surface area S in square meters per gram and a crystallite diameter D in micrometer of the lithium-containing compound being equal to or more than about 1.4×10 −6 cubic meters per gram, wherein the lithium-containing compound is represented by the following Formula (1),

Li 1+a [Mn b M 1−b ] 1−a O 2−c   (1)

where M represents one or more transition metal elements excluding element Mn, and a to c satisfy 0<a<0.25, 0.3≦b<0.7, and −0.1≦c≦0.2.

2. The secondary battery according to claim 1 , wherein the M in the Formula (1) is one or more selected from a group consisting of elements Co, Ni, and Fe.

3. The secondary battery according to claim 2 , wherein the lithium-containing compound is represented by the following Formula (2),

Li 1+d [Mn e Co f Ni 1−e−f ] 1−d O 2−g   (2)

where d to g satisfy 0<d<0.25, 0.3≦e<0.7, 0≦f<(1−e), and −0.1≦g≦0.2.

4. The secondary battery according to claim 1 , wherein the product SD is equal to or more than about 1.8×10 −6 cubic meters per gram.

5. The secondary battery according to claim 1 , wherein the secondary battery is a lithium secondary battery.

6. A cathode active material, the cathode active material being a lithium-rich lithium-containing compound having a bedded salt crystal structure, wherein

a product SD of a specific surface area S in square meters per gram and a crystallite diameter D in micrometer is equal to or more than about 1.4×10 −6 cubic meters per gram, wherein the lithium-containing compound is represented by the following Formula (1),

Li 1+a [Mn b M 1−b ] 1−a O 2−c   (1)

where M represents one or more transition metal elements excluding element Mn, and a to c satisfy 0<a<0.25, 0.3≦b<0.7, and −0.1≦c≦0.2.

7. A cathode, comprising

a lithium-rich lithium-containing compound having a bedded salt crystal structure,

a product SD of a specific surface area S in square meters per gram and a crystallite diameter D in micrometer of the lithium-containing compound being equal to or more than about 1.4×10 −6 cubic meters per gram, wherein the lithium-containing compound is represented by the following Formula (1),

Li 1+a [Mn b M 1−b ] 1−a O 2−c   (1)

where M represents one or more transition metal elements excluding element Mn, and a to c satisfy 0<a<0.25, 0.3≦b<0.7, and −0.1≦c≦0.2.

8. A battery pack, comprising:

a secondary battery;

a control section controlling a used state of the secondary battery; and

a switch section switching the used state of the secondary battery according to an instruction of the control section,

the secondary battery including

a cathode,

an anode, and

an electrolytic solution,

the cathode including a lithium-rich lithium-containing compound having a bedded salt crystal structure, and

a product SD of a specific surface area S in square meters per gram and a crystallite diameter D in micrometer of the lithium-containing compound being equal to or more than about 1.4×10 −6 cubic meters per gram, wherein the lithium-containing compound is represented by the following Formula (1),

Li 1+a [Mn b M 1−b ] 1−a O 2−c   (1)

where M represents one or more transition metal elements excluding element Mn, and a to c satisfy 0<a<0.25, 0.3≦b<0.7, and −0.1≦c≦0.2.

9. An electric vehicle, comprising:

a secondary battery;

a conversion section converting electric power supplied from the secondary battery into drive power;

a drive section operating according to the drive power; and

a control section controlling a used state of the secondary battery,

the secondary battery including

a cathode,

an anode, and

an electrolytic solution,

the cathode including a lithium-rich lithium-containing compound having a bedded salt crystal structure, and

a product SD of a specific surface area S in square meters per gram and a crystallite diameter D in micrometer of the lithium-containing compound being equal to or more than about 1.4×10 −6 cubic meters per gram, wherein the lithium-containing compound is represented by the following Formula (1),

Li 1+a [Mn b M 1−b ] 1−a O 2−c   (1)

where M represents one or more transition metal elements excluding element Mn, and a to c satisfy 0<a<0.25, 0.3≦b<0.7, and −0.1≦c≦0.2.

10. An electric power storage system, comprising:

a secondary battery;

one or more electric devices supplied with electric power from the secondary battery; and

a control section controlling the supplying of the electric power from the secondary battery to the one or more electric devices,

the secondary battery including

a cathode,

an anode, and

an electrolytic solution,

the cathode including a lithium-rich lithium-containing compound having a bedded salt crystal structure, and

a product SD of a specific surface area S in square meters per gram and a crystallite diameter D in micrometer of the lithium-containing compound being equal to or more than about 1.4×10 −6 cubic meters per gram, wherein the lithium-containing compound is represented by the following Formula (1),

Li 1+a [Mn b M 1−b ] 1−a O 2−c   (1)

where M represents one or more transition metal elements excluding element Mn, and a to c satisfy 0<a<0.25, 0.3≦b<0.7, and −0.1≦c≦0.2.

11. An electric power tool, comprising:

a secondary battery; and

a movable section being supplied with electric power from the secondary battery,

the secondary battery including

a cathode,

an anode, and

an electrolytic solution,

the cathode including a lithium-rich lithium-containing compound having a bedded salt crystal structure, and

a product SD of a specific surface area S in square meters per gram and a crystallite diameter D in micrometer of the lithium-containing compound being equal to or more than about 1.4×10 −6 cubic meters per gram, wherein the lithium-containing compound is represented by the following Formula (1),

Li 1+a [Mn b M 1−b ] 1−a O 2−c   (1)

where M represents one or more transition metal elements excluding element Mn, and a to c satisfy 0<a<0.25, 0.3≦b<0.7, and −0.1≦c≦0.2.

12. An electronic apparatus with a secondary battery as an electric power supply source, the secondary battery comprising:

a cathode;

an anode; and

an electrolytic solution,

the cathode including a lithium-rich lithium-containing compound having a bedded salt crystal structure, and

a product SD of a specific surface area S in square meters per gram and a crystallite diameter D in micrometer of the lithium-containing compound being equal to or more than about 1.4×10 −6 cubic meters per gram, wherein the lithium-containing compound is represented by the following Formula (1),

Li 1+a [Mn b M 1−b ] 1−a O 2−c   (1)

where M represents one or more transition metal elements excluding element Mn, and a to c satisfy 0<a<0.25, 0.3≦b<0.7, and −0.1≦c≦0.2.

13. The cathode active material according to claim 6 , wherein the M in the Formula (1) is one or more selected from a group consisting of elements Co, Ni, and Fe.

14. The cathode active material according to claim 13 , wherein the lithium-containing compound is represented by the following Formula (2),

Li 1+d [Mn e Co f Ni 1−e−f ] 1−d O 2−g   (2)

where d to g satisfy 0<d<0.25, 0.3≦e<0.7, 0≦f<(1−e), and −0.1≦g≦0.2.

15. The cathode according to claim 7 , wherein the M in the Formula (1) is one or more selected from a group consisting of elements Co, Ni, and Fe.

16. The cathode according to claim 15 , wherein the lithium-containing compound is represented by the following Formula (2),

Li 1+d [Mn e Co f Ni 1−e−f ] 1−d O 2−g   (2)

where d to g satisfy 0<d<0.25, 0.3≦e<0.7, 0≦f<(1−e), and −0.1≦g≦0.2.

17. The secondary battery according to claim 8 , wherein the M in the Formula (1) is one or more selected from a group consisting of elements Co, Ni, and Fe.

18. The secondary battery according to claim 17 , wherein the lithium-containing compound is represented by the following Formula (2),

Li 1+d [Mn e Co f Ni 1−e−f ] 1−d O 2−g   (2)

where d to g satisfy 0<d<0.25, 0.3≦e<0.7, 0≦f<(1−e), and −0.1≦g≦0.2.

19. The secondary battery according to claim 9 , wherein the M in the Formula (1) is one or more selected from a group consisting of elements Co, Ni, and Fe.

20. The secondary battery according to claim 19 , wherein the lithium-containing compound is represented by the following Formula (2),

Li 1+d [Mn e Co f Ni 1−e−f ] 1−d O 2−g   (2)

where d to g satisfy 0<d<0.25, 0.3≦e<0.7, 0≦f<(1−e), and −0.1≦g≦0.2.

21. The secondary battery according to claim 10 , wherein the M in the Formula (1) is one or more selected from a group consisting of elements Co, Ni, and Fe.

22. The secondary battery according to claim 21 , wherein the lithium-containing compound is represented by the following Formula (2),

Li 1+d [Mn e Co f Ni 1−e−f ] 1−d O 2−g   (2)

where d to g satisfy 0<d<0.25, 0.3≦e<0.7, 0≦f<(1−e), and −0.1≦g≦0.2.

23. The secondary battery according to claim 11 , wherein the M in the Formula (1) is one or more selected from a group consisting of elements Co, Ni, and Fe.

24. The secondary battery according to claim 23 , wherein the lithium-containing compound is represented by the following Formula (2),

Li 1+d [Mn e Co f Ni 1−e−f ] 1−d O 2−g   (2)

where d to g satisfy 0<d<0.25, 0.3≦e<0.7, 0≦f<(1−e), and −0.1≦g≦0.2.

25. The secondary battery according to claim 12 , wherein the M in the Formula (1) is one or more selected from a group consisting of elements Co, Ni, and Fe.

26. The secondary battery according to claim 25 , wherein the lithium-containing compound is represented by the following Formula (2),

Li 1+d [Mn e Co f Ni 1−e−f ] 1−d O 2−g   (2)

where d to g satisfy 0<d<0.25, 0.3≦e<0.7, 0≦f<(1−e), and −0.1≦g≦0.2.