Active material, nonaqueous electrolyte battery, battery pack and battery module

Patent metadata

Field	Value
Publication number	US-2016226067-A1
Application number	US-201615010068-A
Country	US
Kind code	A1
Filing date	Jan 29, 2016
Priority date	Jan 30, 2015
Publication date	Aug 4, 2016
Grant date	—

Abstract

In general, according to one embodiment, there is provided an active material. The active material contains a composite oxide having an orthorhombic crystal structure. The composite oxide is represented by a general formula of Li x M1 1−y M2 y Ti 6−z M3 z O 14+δ . In the general formula, M1 is at least one selected from the group consisting of Sr, Ba, Ca, and Mg; M2 is at least one selected from the group consisting of Cs, K, and Na; M3 is at least one selected from the group consisting of Al, Fe, Zr, Sn, V, Nb, Ta, and
Mo; and x is within a range of 2≦x≦6, y is within a range of 0<y<1, z is within a range of 0<z≦6, and δ is within a range of −0.5≦δ≦0.5.

First claim

What is claimed is:

1 . An active material comprising a composite oxide having an orthorhombic crystal structure and represented by a general formula of Li x M1 1−y M2 y Ti 6−z M3 z O 14+δ , wherein the M1 is at least one selected from the group consisting of Sr, Ba, Ca, and Mg;
the M2 is at least one selected from the group consisting of Cs, K, and Na; the M3 is at least one selected from the group consisting of Al, Fe, Zr, Sn, V, Nb, Ta, and Mo; and x is within a range of 2≦x≦6, y is within a range of 0<y<1, z is within a range of 0<z≦6, and δ is within a range of −0.5≦δ≦5 0.5.

2 . The active material according to claim 1 , wherein the M3 is at least one selected from the group consisting of trivalent Al and Fe, tetravalent Zr and Sn, pentavalent V, Nb and Ta, and hexavalent Mo.

3 . The active material according to claim 1 , wherein, in an X-ray diffraction diagram for the composite oxide obtained by a powder X-ray diffraction method using Cu—Kα rays, an intensity ratio I L /I H is within a range of 0.6≦I L /I H ≦3, wherein the intensity I L is an intensity of a strongest diffraction peak appearing within a range of 17°≦2θ≦18.5°, and the intensity I H is an intensity of a strongest diffraction peak appearing within a range of 18.5°<2θ≦19.5°.

4 . The active material according to claim 1 , wherein
the orthorhombic crystal structure belongs to a space group Cmca, and in an X-ray diffraction diagram for the composite oxide obtained by a powder X-ray diffraction method using Cu—Kα rays, an intensity ratio I L1 /T H1 is within a range of 0.6≦I L1 /I H1 ≦3, wherein the intensity I L1 is an intensity of a diffraction peak having an intensity that is greater of intensities of diffraction peaks corresponding to a (112) plane and a (021) plane, and the intensity I Hi is an intensity of a diffraction peak corresponding to a (220) plane.

5 . The active material according to claim 1 , wherein
the orthorhombic crystal structure belongs to a space group Fmmm, and in an X-ray diffraction diagram for the composite oxide obtained by a powder X-ray diffraction method using Cu—Kα rays, an intensity ratio I L2 /H H2 is within a range of 0.6≦I L2 /I H2 ≦3, wherein the intensity I L2 is an intensity of a diffraction peak corresponding to a (111) plane, and the intensity I H2 is an intensity of a diffraction peak corresponding to a (202) plane.

6 . The active material according to claim 1 , wherein the M1 comprises Sr and the M2 comprises Na.

7 . The active material according to claim 6 , wherein
the composite oxide is represented by a general formula of Li x Sr 1−y Na y Ti 6−z M3 z O 14+δ , wherein the M3 is at least one selected from the group consisting of Al, Fe, Zr, Sn, V, Nb, Ta, and Mo; and x is within a range of 2≦x≦6, y is within a range of 0<y<1, z is within a range of 0<z≦6, and δ is within a range of −0.5≦δ≦0.5.

8 . The active material according to claim 1 , wherein the M3 comprises Nb.

9 . The active material according to claim 1 , wherein the composite oxide is a particle, the active material further comprises a layer covering at least a part of a surface of the particle of the composite oxide, and the layer comprises carbon and/or lithium titanate.

10 . A nonaqueous electrolyte battery comprising:
a negative electrode comprising the active material according to claim 1 ; a positive electrode; and a nonaqueous electrolyte.

11 . A battery pack comprising the nonaqueous electrolyte battery according to claim 10 .

12 . A battery pack comprising nonaqueous electrolyte batteries, each of which comprises:
a negative electrode comprising the active material according to claim 1 ; a positive electrode; and a nonaqueous electrolyte, wherein the nonaqueous electrolyte batteries are electrically connected to each other in series and/or in parallel.

13 . A battery module comprises nonaqueous electrolyte batteries, each of which comprises:
a negative electrode comprising the active material according to claim 1 ; a positive electrode; and a nonaqueous electrolyte, and wherein the nonaqueous electrolyte batteries are electrically connected to each other in series.

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Takami Norio
• Ise Kazuki

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

• H01M4/131

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

• C01G31/006

  Compounds containing vanadium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M2004/027

  Negative electrodes · CPC title