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

Patent metadata

Field	Value
Publication number	US-2019296325-A1
Application number	US-201816124574-A
Country	US
Kind code	A1
Filing date	Sep 7, 2018
Priority date	Mar 23, 2018
Publication date	Sep 26, 2019
Grant date	—

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 I B /I A of the intensity I B of the second peak P B to the intensity I A of the first peak P A is within a range of 4 to 10. 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. 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 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, 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 . A battery pack comprising the secondary battery according to claim 1 .

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

8 . The battery pack according to claim 6 , 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.

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

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

Assignees

• Toshiba Kk

Inventors

• Sekiguchl Yumiko
• Matsuno Shinsuke
• Takami Norio

Classifications

• H01M4/483

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

• 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

• H01M10/0525

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

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M2004/027

  Negative electrodes · CPC title