Active material, nonaqueous electrolyte battery, battery pack and vehicle

Patent metadata

Field	Value
Publication number	US-10305102-B2
Application number	US-201615261398-A
Country	US
Kind code	B2
Filing date	Sep 9, 2016
Priority date	Sep 9, 2015
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

According to one embodiment, there is provided an active material. The active material includes a composite oxide. The composite oxide has a monoclinic crystal structure. The composite oxide is represented by a general formula of Li w Na 4-x M1 y Ti 6-z M2 z O 14+δ . In the general formula, the M1 is at least one element selected from the group consisting of Rb, Cs, K and H; the M2 is at least one metallic element selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn and Al; w is within a range of 0≤w<12; x is within a range of 0<x<4; y is within a range of 0≤y<2; z is within a range of 0<z<6; and δ is within a range of −0.3≤δ≤0.3.

First claim

What is claimed is:

1. An active material comprising a composite oxide having a monoclinic crystal structure and represented by a general formula of Li w Na 4-x M1 y Ti 6-z M2 z O 14+δ , wherein
the M1 is at least one element selected from the group consisting of Rb, Cs, K and H,
the M2 is Nb and/or Ta; or a combination of Nb and/or Ta and at least one metallic element selected from the group consisting of Zr, Sn, V, Mo, W, Fe, Co, Mn and Al, and
w is within a range of 0≤w<12, x is within a range of 0<x<4, y is within a range of 0≤y<2, z is within a range of 0<z≤1, and δ is within a range of −0.3≤δ≤0.3.

2. The active material according to claim 1 , wherein the M2 is pentavalent Nb and/or pentavalent Ta, or a combination of pentavalent Nb and/or pentavalent Ta and at least one element selected from a group consisting of trivalent Fe, Co, Mn and Al, tetravalent Zr and Sn, pentavalent V, and hexavalent Mo and W.

3. The active material according to claim 1 , wherein the crystal structure of the composite oxide has symmetry belonging to any one of space groups C2/m, C2, and Cm.

4. The active material according to claim 1 , wherein a value of x is larger than a value of y.

5. The active material according to claim 1 , wherein the M2 is Nb.

6. The active material according to claim 1 , wherein the composite oxide comprises a crystal water in an amount of 0.1 mol to 2 mol per 1 mol of the composite oxide.

7. The active material according to claim 1 which is used for a battery.

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

9. A battery pack comprising the nonaqueous electrolyte battery according to claim 8 .

10. The battery pack according to claim 9 , further comprising:
an energizing external terminal; and
a protective circuit.

11. A battery pack comprising nonaqueous electrolyte batteries, each of the nonaqueous electrolyte batteries comprising:
a negative electrode comprising the active material according to claim 1 ;
a positive electrode; and
a nonaqueous electrolyte;
wherein the nonaqueous electrolyte batteries are connected in series, in parallel or with a combination of series connection and parallel connection.

12. A vehicle comprising the battery pack according to claim 9 .

13. The vehicle according to claim 12 , wherein the battery pack is configured to recover a regenerative energy caused by a power of the vehicle.

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Takami Norio
• Yoshima Kazuomi

Classifications

• Y10S903/907

  Electricity storage, e.g. battery, capacitor · CPC title

• C30B29/22

  Complex oxides · CPC title

• C01G41/006

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

• C01P2002/76

  by a space-group or by other symmetry indications · CPC title

• C01P2002/77

  by unit-cell parameters, atom positions or structure diagrams · CPC title