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

Patent metadata

Field	Value
Publication number	US-12512458-B2
Application number	US-202318400926-A
Country	US
Kind code	B2
Filing date	Dec 29, 2023
Priority date	May 28, 2020
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

An electrode material may include an active material particle containing: a niobium-titanium composite oxide having an average composition in which a molar ratio of niobium to titanium (M Nb /M Ti ) is greater than 2; and at least one element A selected from the group consisting of potassium, iron and phosphorus. The active material particle may contain the element A at a concentration in the range of 100 ppm to 2000 ppm.

First claim

What is claimed is:

1 . An electrode material, comprising an active material particle comprising:
a niobium-titanium composite oxide having an average composition in which an M Nb /M Ti molar ratio of niobium to titanium is greater than 2; and at least one element A selected from the group consisting of potassium, iron, and phosphorus, wherein the active material particle comprises the element A at a concentration in a range of 100 ppm to 2000 ppm in mass based on total active material particle mass, the at least one element A exists in a solid solution state in the active material particle, and the at least one element A is present in a highest concentration of the solid solution state at a particle interface of the active material particle.

2 . The electrode material of claim 1 , wherein the niobium-titanium composite oxide comprises at least one crystal phase selected from the group consisting of
an Nb 2 TiO 7 phase having a composition in which the M Nb /M Ti molar ratio is greater than 2, an Nb 10 Ti 2 O 29 phase, an Nb 14 TiO 37 phase, and an Nb 24 TiO 62 phase.

3 . The electrode material of claim 1 , wherein the niobium-titanium composite oxide comprises an Nb 2 TiO 7 phase having a composition in which the M Nb /M Ti molar ratio is greater than 2,
wherein a diffraction diagram for the niobium-titanium composite oxide, obtained by powder X-ray diffraction using a Cu-Kα radiation source, has a high-angle side peak P H and a low-angle side peak P L in a range of 20=44°±1.0°, and wherein an I H /I L ratio of a peak intensity I H of the high-angle side peak P H to a peak intensity I L of the low-angle side peak P L is less than 1.

4 . The electrode material of claim 1 , wherein the niobium-titanium composite oxide comprises at least one crystal phase selected from the group consisting of an Nb 10 Ti 2 O 29 phase, an Nb 14 TiO 37 phase, and an Nb 24 TiO 62 phase,
wherein a diffraction diagram for the niobium-titanium composite oxide, obtained by powder X-ray diffraction using a Cu-Kα radiation source, has a high-angle side peak P H and a low-angle side peak P L in a range of 20=44°+1.0°, and an I H /I L ratio of a peak intensity I H of the high-angle side peak P H to a peak intensity I L of the low-angle side peak P L is less than 1.5.

5 . The electrode material of claim 1 , wherein the niobium-titanium composite oxide has a crystallite diameter in a range of from 95 nm to 130 nm.

6 . The electrode material of claim 1 , which comprises a plurality of the active material particle,
wherein the plurality has a D10 in a range of from 0.3 μm to 2.0 μm in a grain size distribution chart obtained by a laser diffraction/scattering method.

7 . The electrode material of claim 1 , which comprises a plurality of the active material particle,
wherein the plurality has a D90 in a range of from 5 μm to 30 μm in a grain size distribution chart obtained by a laser diffraction/scattering method.

8 . The electrode material of claim 1 , which comprises a plurality of the active material particle,
wherein the plurality has a D10/D50 ratio of D10 to D50 in a range of from 0.10 to 0.60, and a D50/D90 ratio of D50 to D90 in a range of from 0.20 to 0.50, in a grain size distribution chart obtained by a laser diffraction/scattering method.

9 . The electrode material of claim 1 , wherein the niobium-titanium composite oxide comprises at least one compound having a general formula selected from the group consisting of Nb 2 M2 z Ti 1-z O 7 , Nb 10-x M1 x Ti 2-y M2 y O 29 , Nb 14-x M1 x Ti 1-y M2 y O37, and Nb 24-x M1 x Ti 1-y M2 y O 62 , and
wherein the M1 is at least one element selected from the group consisting of Ta, Ti, V, Mo, and W, the M2 is at least one element selected from the group consisting of Nb, Ta, Zr, Hf, and Sn, 0≤X≤5, 0≤y<1.0, and 0<z<1.

10 . The electrode material of claim 1 , wherein the at least one element A comprises potassium.

11 . The electrode material of claim 1 , wherein the at least one element A comprises potassium and phosphorus.

12 . An electrode, comprising:
the electrode material of claim 1 .

13 . The electrode of claim 12 , comprising an active material-containing layer comprising the electrode material.

14 . A secondary battery, comprising:
a positive electrode; a negative electrode; and an electrolyte, wherein the negative electrode is the electrode of claim 12 .

15 . A battery pack, comprising:
the secondary battery of claim 14 .

16 . The battery pack of claim 15 , further comprising:
an external power distribution terminal; and a protective circuit.

17 . The battery pack of claim 15 , comprising a plurality of the secondary battery,
wherein the secondary batteries are electrically connected in series, in parallel, or in combination of in series and in parallel.

18 . A vehicle, comprising:
the battery pack of claim 15 .

19 . The vehicle of claim 18 , comprising a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Yoshima Kazuomi
• Takami Norio

Classifications

• H01M2220/20

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

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525

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

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title