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

Patent metadata

Field	Value
Publication number	US-11695113-B2
Application number	US-202117249354-A
Country	US
Kind code	B2
Filing date	Feb 26, 2021
Priority date	Sep 16, 2020
Publication date	Jul 4, 2023
Grant date	Jul 4, 2023

Abstract

According to one embodiment, provided is a secondary battery including a negative electrode containing a titanium-containing oxide, a positive electrode, a separator between the negative electrode and the positive electrode, a first aqueous electrolyte, a second aqueous electrolyte, and a third aqueous electrolyte. The first aqueous electrolyte is held in the negative electrode and contains 0.001% by mass to 0.5% by mass of zinc ions. The second aqueous electrolyte is held in the separator and contains 1% by mass to 5% by mass of a first compound that includes a hydrophobic portion and a hydrophilic portion. The third aqueous electrolyte is held in the positive electrode.

First claim

What is claimed is:

1. A secondary battery comprising:
a negative electrode comprising a titanium-containing oxide;
a positive electrode;
a separator between the negative electrode and the positive electrode;
a first aqueous electrolyte held in the negative electrode, the first aqueous electrolyte comprising 0.001% by mass to 0.5% by mass of zinc ions;
a second aqueous electrolyte held in the separator, the second aqueous electrolyte comprising 1% by mass to 5% by mass of a first compound, the first compound including a hydrophobic portion and a hydrophilic portion; and
a third aqueous electrolyte held in the positive electrode.

2. The secondary battery according to claim 1 , wherein the first compound is a nonionic surfactant.

3. The secondary battery according to claim 2 , wherein the nonionic surfactant comprises polyoxyalkylene alkyl ether.

4. The secondary battery according to claim 2 , wherein the nonionic surfactant has a molecular weight within a range of 200 or more and 4000 or less.

5. The secondary battery according to claim 1 , wherein the separator is hydrophobic.

6. The secondary battery according to claim 1 , wherein the separator has lithium ion conductivity.

7. The secondary battery according to claim 5 , wherein the separator comprises a membrane, the membrane comprising inorganic solid particles and hydrophobic polymers.

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

9. The battery pack according to claim 8 , further comprising an external power distribution terminal and a protective circuit.

10. The battery pack according to claim 8 , further comprising plural of the secondary battery, the secondary batteries being electrically connected in series, in parallel, or in combination of in-series connection and in-parallel connection.

11. A vehicle comprising the battery pack according to claim 8 .

12. The vehicle according to claim 11 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

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

Assignees

• Toshiba Kk
• Kabushiki Kalsha Toshiba

Inventors

• Sekiguchi Yumiko
• Hotta Yasuyuki
• Matsuno Shinsuke

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M2220/20

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