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

Patent metadata

Field	Value
Publication number	US-12113212-B2
Application number	US-202217650784-A
Country	US
Kind code	B2
Filing date	Feb 11, 2022
Priority date	Sep 8, 2021
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

According to one embodiment, provided is an active material including a crystal particle that includes a niobium-titanium composite oxide. A ratio A Nb /A Ti of a Nb abundance A Nb to a Ti abundance A Ti in the crystal particle satisfies 2.3≤A Nb /A Ti ≤4.0. According to a powder X-ray diffraction spectrum using a Cu-Kα ray for the crystal particle, an intensity ratio I β /I α of a peak intensity I β of a peak β appearing at 12.5°≤2θ≤13.0° to a peak intensity I α of a peak α appearing at 8.5°≤2θ≤9.0° is within a range of 0.1<I β /I α ≤2.0.

First claim

What is claimed is:

1. An active material comprising a crystal particle, the crystal particle comprising a niobium-titanium composite oxide,
the crystal particle comprising an A-type niobium-titanium composite oxide phase and a B-type niobium-titanium composite oxide phase in a state of distribution where a boundary is not observed within a primary particle of the active material, and where the A-type niobium-titanium composite oxide phase and the B-type niobium-titanium composite oxide phase are homogenized at a molecular level within the crystal particle,
a ratio A Nb /A Ti of a Nb abundance A Nb to a Ti abundance A Ti in the crystal particle satisfying 2.3≤A Nb /A Ti ≤4.0, and
according to a powder X-ray diffraction spectrum using a Cu-Kα ray for the crystal particle, an intensity ratio I β /I α of a peak intensity I β of a peak β appearing at 12.5°≤2θ≤13.0° attributed to the B-type niobium-titanium composite oxide phase to a peak intensity I α of a peak α appearing at 8.5°<2θ≤9.0° attributed to the A-type niobium-titanium composite oxide phase is within a range of 0.1<I β /I α ≤2.0.

2. The active material according to claim 1 , wherein a mass ratio M A /M B of a mass proportion M A of the A-type niobium-titanium composite oxide phase to a mass proportion M B of the B-type niobium-titanium composite oxide phase is within a range of 0.5≤M A /M B ≤2.5.

3. The active material according to claim 1 , wherein the niobium-titanium composite oxide comprises one or more selected from the group consisting of Ta, K, and P.

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

5. The electrode according to claim 4 , comprising an active material-containing layer, the active material-containing layer containing the active material.

6. A secondary battery comprising:
a negative electrode;
a positive electrode, and
an electrolyte,
the negative electrode comprising the electrode according to claim 4 .

7. A battery pack comprising the secondary battery according to claim 6 .

8. The battery pack according to claim 7 , further comprising an external power distribution terminal and a protective circuit.

9. The battery pack according to claim 7 , 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.

10. A vehicle comprising the battery pack according to claim 7 .

11. The vehicle according to claim 10 , wherein the vehicle comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

12. The active material according to claim 1 , wherein the A-type niobium-titanium composite oxide phase is a Nb 2 TiO 7 -type crystal phase and the B-type niobium-titanium composite oxide phase is a Nb 10 Ti 2 O 28 -type crystal phase.

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Murata Yoshiaki
• Ise Kazuki
• Takami Norio

Classifications

• H01M2220/20

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

• H01M2004/027

  Negative electrodes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

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