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

Patent metadata

Field	Value
Publication number	US-2023290940-A1
Application number	US-202217896269-A
Country	US
Kind code	A1
Filing date	Aug 26, 2022
Priority date	Mar 14, 2022
Publication date	Sep 14, 2023
Grant date	—

Abstract

According to one embodiment, an active material is provided. The active material includes a primary particle including an Nb 10 Ti 2 O 29 phase and at least one Nb-rich phase selected from an Nb 14 TiO 37 phase and an Nb 24 TiO 64 phase. In the primary particle, a ratio M Nb /M Ti of substance amount of niobium to titanium satisfies 5.0<M Nb /M Ti ≤24.0. A diffraction chart according to a wide angle X-ray diffraction method using a CuKα ray for the active material includes a peak A and a peak C attributed to the Nb 10 Ti 2 O 29 phase and a peak B appearing within a range of 2θ of 25.5±0.2° attributed to the Nb-rich phase. The active material satisfies a peak intensity ratio represented by 0<I B /I A <5.0. A half width of the peak C is in a range of 0.15° or more and 0.80° or less.

First claim

What is claimed is:

1 . An active material comprising a primary particle,
the primary particle comprising an Nb 10 Ti 2 O 29 phase and at least one Nb-rich phase selected from the group consisting of an Nb 14 TiO 37 phase and an Nb 24 TiO 64 phase, a ratio M Nb /M Ti of a substance amount of niobium to a substance amount of titanium in the primary particle satisfying 5.0<M Nb /M Ti ≤24.0, a diffraction chart according to a wide angle X-ray diffraction method using a CuKα ray as an X-ray source for the active material comprising: a peak A appearing within a range of 2θ of 24.9±0.2° attributed to the Nb 10 Ti 2 O 29 phase; a peak B appearing within a range of 2θ of 25.5±0.2° attributed to the Nb-rich phase; and a peak C appearing within a range of 2θ of 23.7±0.2° attributed to the Nb 10 Ti 2 O 29 phase, the active material satisfying a first peak intensity ratio represented by following formula (1):
0 <I B /I A <5.0  (1)

where I A is a peak intensity of the peak A, and I B is a peak intensity of the peak B, and a half width of the peak C being in a range of 0.15° or more and 0.80° or less.

2 . The active material according to claim 1 , wherein the primary particle is configured of a mixed phase of the Nb 10 Ti 2 O 29 phase and the at least one Nb-rich phase.

3 . The active material according to claim 1 , further satisfying a second peak intensity ratio represented by following formula (2):
0≤ I D /I A <0.01  (2)

where I A is the peak intensity of the peak A appearing within the range of 2θ of 24.9±0.2° attributed to the Nb 10 Ti 2 O 29 phase in the diffraction chart according to the wide angle X-ray diffraction method using the CuKα ray as the X-ray source, and I D is a peak intensity of a peak D appearing within a range of 2θ of 20.1±0.2° attributed to the Nb 2 TiO 7 phase in the diffraction chart.

4 . The active material according to claim 1 , wherein the first peak intensity ratio I B /I A is within a range of 0.01 or more and 1.20 or less.

5 . The active material according to claim 1 , wherein the ratio M Nb /M Ti satisfies 6.5≤M Nb /M Ti ≤12.0.

6 . The active material according to claim 1 , wherein the half width of the peak C is within a range of 0.20° or more and 0.45° or less.

7 . The active material according to claim 1 , comprising at least one selected from the group consisting of Ta, K, and P.

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

9 . The electrode according to claim 8 , wherein the electrode comprises an active material-containing layer containing the active material.

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

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

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

13 . The battery pack according to claim 11 , further comprising plural of the secondary battery, the secondary batteries being electrically connected in series, in parallel, or in a combination of in series and in parallel.

14 . A vehicle comprising the battery pack according to claim 11 .

15 . The vehicle according to claim 14 , comprising a mechanism that converts kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

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

Classifications

• H01M2220/20

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

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

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

• H01M50/284

  with incorporated circuit boards, e.g. printed circuit boards [PCB] · CPC title