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

Patent metadata

Field	Value
Publication number	US-2023071491-A1
Application number	US-202217650784-A
Country	US
Kind code	A1
Filing date	Feb 11, 2022
Priority date	Sep 8, 2021
Publication date	Mar 9, 2023
Grant date	—

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, 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° to a peak intensity I α of a peak α appearing at 8.50°≤2θ≤9.0° is within a range of 0.1<I β /I α ≤2.0.

2 . The active material according to claim 1 , wherein the crystal particle comprises an A-type niobium-titanium composite oxide phase to which the peak α is attributed and a B-type niobium-titanium composite oxide phase to which the peak β is attributed, and 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.

Assignees

• Toshiba Kk

Inventors

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

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2220/20

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

• C01P2006/12

  Surface area · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title

• H01M10/0525

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