Niobium-titanium-based oxide, electrode, secondary battery, battery pack, vehicle, and stationary power source

Patent metadata

Field	Value
Publication number	US-2024079576-A1
Application number	US-202318458267-A
Country	US
Kind code	A1
Filing date	Aug 30, 2023
Priority date	Sep 7, 2022
Publication date	Mar 7, 2024
Grant date	—

Abstract

A niobium-titanium-based oxide includes niobium-titanium-based oxide particles, wherein an Si2p peak area and an Nb3d peak area, as measured by X-ray photoelectron spectroscopy for the niobium-titanium-based oxide particles, satisfy a ratio A of 0.40≤A≤1.0, provided that the ratio A is the Si2p peak area/the Nb3d peak area.

First claim

What is claimed is:

1 . A niobium-titanium-based oxide, comprising:
niobium-titanium-based oxide particles, wherein an Si2p peak area and an Nb3d peak area, as measured by X-ray photoelectron spectroscopy for the niobium-titanium-based oxide particles, satisfy a ratio A of 0.40≤A≤1.0, provided that the ratio A is the Si2p peak area/the Nb3d peak area.

2 . The niobium-titanium-based oxide according to claim 1 , wherein the niobium-titanium-based oxide is at least one selected from the group consisting of a composite oxide represented by general formula Li x Ti 1−y M1 y Nb 2−z M2 z O 7+δ and a composite oxide represented by general formula Li x Ti 1−y M3 y+z Nb 2−z O 7−δ , where M1 is at least one selected from the group consisting of Zr, Si, and Sn;
M2 is at least one selected from the group consisting of V, Ta, Bi, K, Ca, B, Co, Fe, Mn, Ni, Si, P, and Mo; M3 is at least one selected from Mg, Fe, Ni, Co, W, Ta, and Mo; and 0≤x≤5, 0≤y<1, 0≤z≤0.5, and −0.3≤δ≤0.3.

3 . The niobium-titanium-based oxide according to claim 1 , wherein in a particle size distribution chart of the niobium-titanium-based oxide particles as obtained by a laser diffraction scattering method, a median diameter D50 is 0.5 μm or more and 4.0 μm or less.

4 . An electrode comprising, in an active material, the niobium-titanium-based oxide according to claim 1 .

5 . A secondary battery comprising the electrode according to claim 4 as a negative electrode, a positive electrode, and an electrolyte.

6 . A battery pack comprising the secondary battery according to claim 5 .

7 . The battery pack according to claim 6 , further comprising an external power distribution terminal and a protection circuit.

8 . The battery pack according to claim 6 , comprising a plurality of the secondary batteries, wherein the secondary batteries are electrically connected in series, in parallel, or in combination of series and parallel.

9 . A vehicle comprising the battery pack according to claim 6 .

10 . A stationary power source comprising the battery pack according to claim 6 .

11 . A niobium-titanium-based oxide, comprising:
niobium-titanium-based oxide particles, wherein a ratio of a peak area of a region from 95 to 110 eV and a peak area of a region from 203 to 214 eV, as measured by X-ray photoelectron spectroscopy for the niobium-titanium-based oxide particles, is 0.40 or more and 1.0 or less where the ratio is the peak area of a region from 95 to 110 eV/the peak area of a region from 203 to 214 eV.

12 . The niobium-titanium-based oxide according to claim 11 , wherein the niobium-titanium-based oxide is at least one selected from the group consisting of a composite oxide represented by general formula Li x Ti 1−y M1 y Nb 2−z M2 z O 7+δ and a composite oxide represented by general formula Li x Ti 1−y M3 y+z Nb 2−z O 7−δ , where M1 is at least one selected from the group consisting of Zr, Si, and Sn;
M2 is at least one selected from the group consisting of V, Ta, Bi, K, Ca, B, Co, Fe, Mn, Ni, Si, P, and Mo; M3 is at least one selected from Mg, Fe, Ni, Co, W, Ta, and Mo; and 0≤x≤5, 0≤y<1, 0≤z≤0.5, and −0.3≤δ≤0.3.

13 . The niobium-titanium-based oxide according to claim 11 , wherein in a particle size distribution chart of the niobium-titanium-based oxide particles as obtained by a laser diffraction scattering method, a median diameter D50 is 0.5 μm or more and 4.0 μm or less.

14 . An electrode comprising, in an active material, the niobium-titanium-based oxide according to claim 11 .

15 . A secondary battery comprising the electrode according to claim 14 as a negative electrode, a positive electrode, and an electrolyte.

16 . A battery pack comprising the secondary battery according to claim 15 .

17 . The battery pack according to claim 16 , further comprising an external power distribution terminal and a protection circuit.

18 . The battery pack according to claim 16 , comprising a plurality of the secondary batteries, wherein the secondary batteries are electrically connected in series, in parallel, or in combination of series and parallel.

19 . A vehicle comprising the battery pack according to claim 16 .

20 . A stationary power source comprising the battery pack according to claim 16 .

Assignees

• Toshiba Kk

Inventors

• Ueda Kakuya
• Murata Yoshiaki
• Harada Yasuhiro
• Takami Norio
• Matsuno Shinsuke

Classifications

• 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

• H01M10/0525 Primary

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

• H01M2004/021

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

• H01M2220/20

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

• Y02E60/10

  Energy storage using batteries · CPC title