Secondary battery, battery pack, vehicle, and stationary power supply

Patent metadata

Field	Value
Publication number	US-11139463-B2
Application number	US-201816124574-A
Country	US
Kind code	B2
Filing date	Sep 7, 2018
Priority date	Mar 23, 2018
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

According to one embodiment, a secondary battery is provided. The secondary battery includes a positive electrode, a negative electrode including titanium oxide particles, and an aqueous electrolyte. The surfaces of the titanium oxide particles are partially covered with an alkyl-based silane compound. The ratio IB/IA of the intensity IB of the second peak PB to the intensity IA of the first peak PA is within a range of 4 to 10. The first peak PA is a maximum peak present within a range of 3200 cm−1 to 3600 cm−1 in an infrared absorption spectrum of the titanium oxide particles. The second peak PB is a maximum peak present within a range of 565 cm−1 to 570 cm−1 in the infrared absorption spectrum of the titanium oxide particles.

First claim

What is claimed is:

1. A secondary battery comprising: a positive electrode; a negative electrode comprising titanium oxide particles; and an aqueous electrolyte, wherein
surfaces of the titanium oxide particles are partially covered with an alkyl-based silane compound comprising at least one selected from the group consisting of methyltrimethoxysilane, propyltrimethoxysilane, hexyltrimethoxysilane, decyltrimethoxysilane, trimethoxy (3,3,3-trifluoropropyl) silane, dimethyldimethoxysilane, methyltriethoxysilane, and dimethyldiethoxysilane, and
a ratio I B /I A of an intensity I B of a second peak P B to an intensity I A of a first peak P A is within a range of 4 to 10, where
the first peak P A is a maximum peak present within a range of 3200 cm −1 to 3600 cm −1 in an infrared absorption spectrum of the titanium oxide particles obtained by infrared spectroscopy, and the second peak P B is a maximum peak present within a range of 565 cm −1 to 570 cm −1 in the infrared absorption spectrum.

2. The secondary battery according to claim 1 ,
wherein the infrared absorption spectrum comprises a third peak P c , which is present within a range of 2800 cm −1 to 3000 cm −1 .

3. The secondary battery according to claim 1 , wherein
the alkyl-based silane compound comprises an alkyl group, and
the alkyl group is hydrocarbon having one to 10 carbon atoms.

4. The secondary battery according to claim 1 , wherein the titanium oxide particles comprise at least one oxide selected from a group consisting of titanium dioxide, lithium titanium composite oxide, sodium titanium composite oxide, aluminum titanium composite oxide, and niobium titanium composite oxide.

5. The secondary battery according to claim 4 , wherein the titanium oxide particles comprise the titanium dioxide.

6. The secondary battery according to claim 1 , wherein the negative electrode comprises the titanium oxide particles as a negative electrode active material, and the coverages of the surfaces of the titanium oxide particles with the alkyl-based silane compound is in a range of 0.5% by mass to 1.0% by mass with respect to the total mass of the negative electrode active materials.

7. The secondary battery according to claim 1 , wherein the alkyl-based silane compound comprises at least one selected from the group consisting of a methyl group, an ethyl group, or a propyl group.

8. The secondary battery according to claim 1 , wherein surfaces of the titanium oxide particles are partially covered with at least one alkyl-based silane compound selected from the group consisting of methyltrimethoxysilane, propyltrimethoxysilane, trimethoxy(3,3,3-trifluoropropyl)silane, dimethyldimethoxysilane, methyltriethoxysilane, and dimethyldiethoxysilane.

9. The secondary battery according to claim 1 , wherein surfaces of the titanium oxide particles are partially covered with at least one alkyl-based silane compound selected from the group consisting of hexyltrimethoxysilane and decyltrimethoxysilane.

10. A battery pack comprising the secondary battery according to claim 1 .

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, wherein the secondary batteries are electrically connected in series, in parallel, or in a combination of series connection and parallel connection.

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

14. A stationary power supply comprising the battery pack according to claim 10 .

Assignees

• Toshiba Kk

Inventors

• Sekiguchi Yumiko
• Matsuno Shinsuke
• Takami Norio

Classifications

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title

• H01M10/0525

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

• H01M2220/20

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

• Y02E60/10

  Energy storage using batteries · CPC title