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

Patent metadata

Field	Value
Publication number	US-2024313205-A1
Application number	US-202318455043-A
Country	US
Kind code	A1
Filing date	Aug 24, 2023
Priority date	Mar 17, 2023
Publication date	Sep 19, 2024
Grant date	—

Abstract

According to one embodiment, an active material including a niobium-titanium oxide phase having a monoclinic structure is provided. The niobium-titanium oxide phase has a crystal structure that includes in a crystal lattice thereof, at least one per unit lattice of a (Nb, Ti) O 6 octahedron site composed only with vertex-sharing, a bond angle distortion in the octahedron site being 0.8 σ 2 /deg 2 or less. A crystallite diameter of the niobium-titanium oxide phase is in a range from 85 nm or greater to 130 nm or less.

First claim

What is claimed is:

1 . An active material comprising a niobium-titanium oxide phase having a monoclinic structure,
the niobium-titanium oxide phase having a crystal structure that includes in a crystal lattice thereof, at least one per unit lattice of a (Nb, Ti) O 6 octahedron site composed only with vertex-sharing a bond angle distortion in the octahedron site being 0.8 σ 2 /deg 2 or less, and a crystallite diameter of the niobium-titanium oxide phase being in a range from 85 nm or greater to 130 nm or less.

2 . The active material according to claim 1 , wherein the active material comprises primary particles of the niobium-titanium oxide phase, and
an average particle size D 50 of the primary particles falls within a range from 0.1 μm or greater and 10 μm or less.

3 . The active material according to claim 1 , wherein the niobium-titanium oxide phase contains at least one phase selected from the group consisting of Nb 2 TiO 7 phase and Nb 10 Ti 2 O 29 phase.

4 . The active material according to claim 3 , wherein the at least one phase contains at least one selected from a group consisting of K, Zr, Sn, V, Ta, Mo, W, P, Y, Fe, Co, Cr, Mn, Ni, and Al.

5 . The active material according to claim 1 , wherein the niobium-titanium oxide phase has a monoclinic crystal structure belonging to a space group C2/m, and a bond angle distortion is 0.8 σ 2 /deg 2 or less in a 2 a site according to symmetry described in International Tables, volume A, in the monoclinic crystal structure.

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

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

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

13 . The vehicle according to claim 12 , wherein the vehicle comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Ise Kazuki
• Yamashita Yasunobu
• Ueda Kakuya
• Murata Yoshiaki
• Takami Norio

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• B60L50/64

  Constructional details of batteries specially adapted for electric vehicles · CPC title

• H01M50/204

  Racks, modules or packs for multiple batteries or multiple cells · CPC title

• H01M50/249

  specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64) · CPC title

• H01M10/0525

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