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

Patent metadata

Field	Value
Publication number	US-10868340-B2
Application number	US-201916299953-A
Country	US
Kind code	B2
Filing date	Mar 12, 2019
Priority date	Mar 23, 2018
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

According to one embodiment, there is provided a secondary battery including a positive electrode, a negative electrode, and an aqueous electrolyte. The negative electrode contains a titanium-containing oxide. The aqueous electrolyte contains a solvent and alkali metal ions or alkaline earth metal ions, the solvent containing water and a water-soluble organic solvent. An interfacial tension of the aqueous electrolyte is 37 mN/m or less.

First claim

What is claimed is:

1. A secondary battery comprising:
a positive electrode;
a negative electrode comprising a titanium-containing oxide; and
an aqueous electrolyte comprising a solvent and alkali metal ions or alkaline earth metal ions, the solvent comprising water and a water-soluble organic solvent, and an interfacial tension of the aqueous electrolyte being 37 mN/m or less.

2. The secondary battery according to claim 1 , wherein the interfacial tension of the aqueous electrolyte is 34 mN/m or less.

3. The secondary battery according to claim 1 , wherein the aqueous electrolyte further comprises a first compound, the first compound comprising an organic compound, the organic compound comprising a hydrophilic portion and a hydrophobic portion.

4. The secondary battery according to claim 3 , wherein the organic compound is a nonionic surfactant.

5. The secondary battery according to claim 4 , wherein the nonionic surfactant comprises one or more surfactant selected from a group consisting of polyoxyethylene alkyl ether and polyoxyalkylene alkyl ether.

6. The secondary battery according to claim 4 , wherein the nonionic surfactant has a molecular weight within a range of from 200 to 4000.

7. The secondary battery according to claim 1 , wherein the aqueous electrolyte is a first aqueous electrolyte in contact with the negative electrode.

8. The secondary battery according to claim 7 , wherein pH of the first aqueous electrolyte is 7 or more.

9. The secondary battery according to claim 1 , wherein the water-soluble organic solvent includes at least one solvent selected from a group consisting of N-methyl-2-pyrrolidone, methanol, ethanol, propanol, isopropanol, butanol, isobutyl alcohol, sec-butyl alcohol, tert-butanol, ethylene glycol, 1,2-dimethoxyethane, tetrahydrofuran, 1,4-dioxane, acetone, ethyl methyl ketone, acetonitrile, dimethylformamide, hexamethylphosphoric triamide, triethylamine, pyridine, and dimethyl sulfoxide.

10. The secondary battery according to claim 1 , wherein the negative electrode further comprises zinc.

11. The secondary battery according to claim 1 , wherein the negative electrode further comprises a negative electrode current collector comprising zinc.

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

13. The battery pack according to claim 12 , further comprising an external power distribution terminal and a protective circuit.

14. The battery pack according to claim 12 , further comprising plural of the secondary battery,
wherein the secondary batteries are electrically connected in series, in parallel, or in combination of in-series connection and in-parallel connection.

15. A vehicle comprising the battery pack according to claim 12 .

16. The vehicle according to claim 15 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

17. A stationary power supply comprising the battery pack according to claim 12 .

Assignees

• Toshiba Kk

Inventors

• Sekiguchi Yumiko
• Seki Hayato
• Matsuno Shinsuke
• Takami Norio

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0014

  Alkaline electrolytes · CPC title

• H01M4/24 Primary

  Electrodes for alkaline accumulators · CPC title

• H01M10/24

  Alkaline accumulators · 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