Active material, electrode, secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-11990614-B2
Application number	US-202117446482-A
Country	US
Kind code	B2
Filing date	Aug 31, 2021
Priority date	Mar 17, 2021
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

According to one embodiment, provided is an active material including a composite oxide having a tetragonal crystal structure. The composite oxide is represented by general formula Li a Ti b Nb 2−2d M c+2d O 2b+5+3c . Here, M is one selected from the group consisting of W and Mo, 0≤a≤b+4+3c, 0<b<2−2d, and 0<c<2−4d.

First claim

What is claimed is:

1. An active material, comprising:
a composite oxide of formula:
Li a Ti b Nb 2-2d M c+2d O 2b+5+3c ,

wherein
M is one selected from the group consisting of W and Mo,
0≤a≤b+4+3c,
0<b<2−2d, and
0<c<2−4d, and
wherein the composite oxide is of a tetragonal crystal structure.

2. The active material according to claim 1 , wherein M is W, and the tetragonal crystal structure of the composite oxide comprises a rhenium oxide block structure having an octahedral structure configured of oxygen and a metal element and being configured by 16 of the octahedral structures sharing vertices.

3. The active material according to claim 1 , wherein M is Mo, and the tetragonal crystal structure of the composite oxide comprises a rhenium oxide-block structure having an octahedral structure configured of oxygen and a metal element and being configured by 9 of the octahedral structures sharing vertices.

4. The active material according to claim 1 , further comprising at least one element selected from the group consisting of Ti V, Ta, Fe, Bi, Sb, As, P, Cr, Mo, W, B, Na, K, Mg, Al, Ca, Y, Zr, and Si.

5. The active material according to claim 1 , wherein in a diffraction spectrum according to powder X-ray diffraction using a Cu-Kα ray source, a peak intensity of a peak having highest intensity appearing in a range of 2θ=25.1±0.5° and a peak intensity I2 of a peak appearing in a range of 2θ=23.8±0.5° satisfy a relationship of 0.1≤I2/I1≤1.0.

6. An electrode comprising the active material according to claim 1 .

7. The electrode according to claim 6 , comprising an active material-containing layer, the active material-containing layer containing the active material.

8. A secondary battery comprising:
a positive electrode;
a negative electrode; and
an electrolyte,
the negative electrode comprising the electrode according to claim 6 .

9. A secondary battery comprising:
a positive electrode;
a negative electrode; and
an electrolyte,
the positive electrode comprising the electrode according to claim 6 .

10. A battery pack comprising the secondary battery according to claim 8 .

11. The battery pack according to claim 10 , further comprising an external power distribution terminal and a protective circuit.

12. The battery pack according to claim 10 , comprising plural of the secondary battery, the secondary batteries being electrically connected in series, in parallel, or in combination of in-series connection and in-parallel connection.

13. A vehicle comprising the battery pack according to claim 10 .

14. The vehicle according to claim 13 , wherein the vehicle comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

15. The active material according to claim 4 , wherein an amount of the at least one element is 10 ppm to 10000 ppm in terms of mass with respect to the composite oxide of formula Li a Ti b Nb 2−2d M c+2d O 2b+5+3c .

Assignees

• Toshiba Kk

Inventors

• Ise Kazuki
• Yasumiishi Hirofumi
• Hoshina Keigo
• Harada Yasuhiro
• Takami Norio

Classifications

• 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

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title