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

Patent metadata

Field	Value
Publication number	US-11637281-B2
Application number	US-202117181622-A
Country	US
Kind code	B2
Filing date	Feb 22, 2021
Priority date	Sep 16, 2020
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

According to one embodiment, a secondary battery ( 100 ) including a positive electrode ( 5 ), a negative electrode ( 3 ), a first electrolyte ( 9 ), and a second electrolyte ( 8 ). The negative electrode ( 3 ) includes a lithium titanium oxide having a degree of proton substitution of 0.01 to 0.2. The first electrolyte ( 9 ) includes water and in contact with the positive electrode ( 5 ). The second electrolyte ( 8 ) includes water and in contact with the negative electrode ( 3 ).

First claim

The invention claimed is:

1. A secondary battery comprising:
a positive electrode;
a negative electrode comprising a lithium titanium oxide represented by H y (Li 1-x H x ) 4 Ti 5 O 12 , where 0≤x<1 and 0<y<0.2;
a first electrolyte comprising water and in contact with the positive electrode; and
a second electrolyte comprising water and in contact with the negative electrode.

2. The secondary battery according to claim 1 , wherein the second electrolyte satisfies pH >8.

3. The secondary battery according to claim 1 , wherein a pH of the second electrolyte is larger than a pH of the first electrolyte.

4. The secondary battery according to claim 1 , wherein a pH of the second electrolyte is 8 or more and is larger than a pH of the first electrolyte.

5. The secondary battery according to claim 1 , wherein a water concentration of the first electrolyte and the second electrolyte is 0.1 mol/L or more.

6. The secondary battery according to claim 1 , wherein a degree of proton substitution is from 0.01 to 0.15.

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

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

9. The battery pack according to claim 7 , comprising a plurality of the secondary battery, wherein the plurality of the secondary battery are electrically connected in series, in parallel, or in a combination of in-series connection and in-parallel connection.

10. A vehicle comprising the battery pack according to claim 7 .

11. The vehicle according to claim 10 , comprising a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

12. A stationary power supply comprising the battery pack according to claim 7 .

13. The secondary battery according to claim 1 , wherein a degree of proton substitution is from 0.01 to 0.2.

14. The secondary battery according to claim 1 , wherein a degree of proton substitution is from 0.01 to 0.1.

Assignees

• Toshiba Kk

Inventors

• Seki Hayato
• Uno Wataru
• Kuboki Takashi

Classifications

• 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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0563

  Liquid materials, e.g. for Li-SOCl2 cells · CPC title

• H01M2300/0002

  Aqueous electrolytes · CPC title