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

Patent metadata

Field	Value
Publication number	US-2022302445-A1
Application number	US-202117446482-A
Country	US
Kind code	A1
Filing date	Aug 31, 2021
Priority date	Mar 17, 2021
Publication date	Sep 22, 2022
Grant date	—

Abstract

According to one embodiment, provided is an active material including a composite oxide having a tetragonal crystal structure. The composite oxide is represented by general formula LiaTibNb2−2dMc+2dO2b+5+3c. Here, M is one selected from the group consisting of W and Mo, 0≤a≤b+4+3c, 0<b<2−2d, and 0<c<2−4d.

First claim

What is claimed is:

1 . An active material comprising a composite oxide having a tetragonal crystal structure and represented by a general formula Li a Ti b Nb 2−2d M c+2d O 2b+5+3c , where M is one selected from the group consisting of W and Mo, 0≤a≤b+4+3c, 0<b<2−2d, and 0<c<2−4d.

2 . The active material according to claim 1 , wherein M in the general formula is W, and the composite oxide has a crystal structure comprising a rhenium oxide block structure, the rhenium oxide block structure comprising an octahedral structure configured of oxygen and a metal element and being configured by 16 of the octahedral structures sharing vertices.

3 . The active material according to claim 1 , wherein M in the general formula is Mo, and the composite oxide has a crystal structure comprising a rhenium oxide-block structure, the rhenium oxide block structure comprising an octahedral structure configured of oxygen and a metal element and being configured by 9 of the octahedral structures sharing vertices.

4 . The active material according to claim 1 , further comprising at least one element selected from the group consisting of Ti, V, Ta, Fe, Bi, Sb, As, P, Cr, Mo, W, B, Na, K, Mg, Al, Ca, Y, Zr, and Si.

5 . The active material according to claim 1 , wherein in a diffraction spectrum according to powder X-ray diffraction using a Cu-Kα ray source, a peak intensity I1 of a peak having highest intensity appearing in a range of 2θ=25.1±0.5° and a peak intensity I2 of a peak appearing in a range of 2θ=23.8±0.5° satisfy a relationship of 0.1≤I2/I1≤1.0.

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

7 . The electrode according to claim 6 , comprising an active material-containing layer, the active material-containing layer containing 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 secondary battery comprising:
a positive electrode; a negative electrode; and an electrolyte, the positive electrode comprising the electrode according to claim 6 .

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

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

12 . The battery pack according to claim 10 , 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.

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

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

Assignees

• Toshiba Kk

Inventors

• Ise Kazuki
• Yasumiishi Hirofumi
• Hoshina Keigo
• Harada Yasuhiro
• Takami Norio

Classifications

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · 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

• H01M2004/021

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

• C01P2002/80

  defined by measured data other than those specified in group C01P2002/70 · CPC title

• C01P2006/40

  Electric properties · CPC title