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

Patent metadata

Field	Value
Publication number	US-10608250-B2
Application number	US-201815899951-A
Country	US
Kind code	B2
Filing date	Feb 20, 2018
Priority date	Sep 20, 2017
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

According to one embodiment, an active material is provided. The active material includes particles. The particles have a crystal structure belonging to a monoclinic niobium-titanium composite oxide. A ratio of a crystallite size Dc corresponding to a (020) plane with respect to an average primary particle size Dp of the particles is not less than 35%.

First claim

What is claimed is:

1. An active material comprising particles having a crystal structure belonging to a monoclinic niobium-titanium composite oxide,
wherein a ratio of a crystallite size Dc corresponding to a (020) plane with respect to an average primary particle size Dp of the particles is not less than 35%.

2. The active material according to claim 1 , wherein the ratio is 35% to 98%.

3. The active material according to claim 1 , wherein the crystallite size Dc is 10 nm to 120 nm.

4. The active material according to claim 1 , wherein the average primary particle size Dp is 10 nm to 350 nm.

5. An active material composite material comprising the active material according to claim 1 , and a carbon body supported on at least a portion of surfaces of the particles.

6. The active material composite material according to claim 5 , wherein in a Raman spectrum according to micro Raman spectroscopy using a light source with a wavelength of 532 nm, a full width at half maximum of a peak derived from a niobium oxide octahedron is 20 cm −1 to 50 cm −1 , the peak appearing within a Raman shift range of 970 cm −1 to 1,010 cm −1 .

7. The active material composite material according to claim 5 , wherein a Raman spectrum according to micro Raman spectroscopy using a light source with a wavelength of 532 nm comprises a G band observed within a Raman shift range of 1,530 cm −1 to 1,630 cm −1 and a D band observed within a Raman shift range of 1,280 cm −1 to 1,380 cm −1 , and a ratio I G /I D of a peak intensity I G of the G band to a peak intensity I D of the D band is not more than 1.2.

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

9. A secondary battery comprising:
the electrode according to claim 8 as a negative electrode;
a positive electrode; and
an electrolyte.

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

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 ,
wherein:
the battery pack includes plural of the secondary batteries; and
the secondary batteries are electrically connected in series, in parallel, or in combination of series and parallel.

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

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

Assignees

• Toshiba Kk

Inventors

• Ise Kazuki
• Harada Yasuhiro
• Takami Norio

Classifications

• C01P2006/40

  Electric properties · 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

• H01M2220/20

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

• C01G23/04 Primary

  Oxides; Hydroxides · CPC title

• H01M10/052

  Li-accumulators · CPC title