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

Patent metadata

Field	Value
Publication number	US-12512467-B2
Application number	US-202217896269-A
Country	US
Kind code	B2
Filing date	Aug 26, 2022
Priority date	Mar 14, 2022
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

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 molar ratio Nb/Ti of niobium to titanium in the primary particle satisfying 5.0<Nb/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) and a second peak intensity ratio represented by following formula (2):
0< I B /I A <5.0  (1)

0≤ I D /I A <0.01  (2)

where I A is a peak intensity of the peak A, I B is a peak intensity of the peak B, 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, 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 first peak intensity ratio I B /I A is within a range of 0.01 or more and 1.20 or less.

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

4 . 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.

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

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

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

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

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

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

11 . The battery pack according to claim 9 , 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.

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

13 . The vehicle according to claim 12 , further 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