Secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-10756392-B2
Application number	US-201815908330-A
Country	US
Kind code	B2
Filing date	Feb 28, 2018
Priority date	Sep 20, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

According to one embodiment, a secondary battery is provided. The secondary battery includes a negative electrode, a positive electrode, a first aqueous electrolyte, a second aqueous electrolyte, and a partition having a first surface and a second surface opposite to the first surface. The partition is positioned between the negative electrode and the positive electrode. The first aqueous electrolyte is in contact with the first surface of the partition and the negative electrode. The second aqueous electrolyte is in contact with the second surface of the partition and the positive electrode. The partition contains a solid electrolyte having alkali metal ion conductivity. The first aqueous electrolyte includes an organic compound.

First claim

What is claimed is:

1. A secondary battery comprising a negative electrode, a positive electrode, a first aqueous electrolyte, a second aqueous electrolyte, and a partition having a first surface and a second surface opposite to the first surface,
wherein:
the partition is positioned between the negative electrode and the positive electrode,
the first aqueous electrolyte is in contact with the first surface of the partition and the negative electrode,
the second aqueous electrolyte is in contact with the second surface of the partition and the positive electrode,
the partition comprises a solid electrolyte having alkali metal ion conductivity,
the first aqueous electrolyte comprises a first organic compound, and
when the second aqueous electrolyte comprises a second organic compound, a ratio M1 of a molar concentration of the first organic compound to a molar concentration of water in the first aqueous electrolyte is higher than a ratio M2 of a molar concentration of the second organic compound to a molar concentration of water in the second aqueous electrolyte.

2. The secondary battery according to claim 1 , wherein the ratio M1 is within a range of 0.0001 to 0.5.

3. The secondary battery according to claim 1 , wherein a pH of the first aqueous electrolyte is within a range of 6 to 14.

4. The secondary battery according to claim 1 , wherein the first organic compound is at least one selected from the group consisting of:
N-methyl-2-pyrrolidone (NMP), succinimide, acetonitrile, methylamine, 2-amino-methylpropane, propyl amine, dimethylamine, diethylamine, trimethylamine, triphenylamine, acetamide, N-methylacetamide, dimethylacetamide, dimethylformamide, butyramide, and derivatives thereof; and
methanol, ethanol, propanol, isopropanol, butanol, isobutyl alcohol, ethylene glycol, dimethyl ether, and derivatives thereof.

5. The secondary battery according to claim 1 , wherein the partition comprises a composite of the solid electrolyte and a polymeric material.

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 , further comprising plural of the secondary battery,
wherein the secondary batteries are electrically connected in series, in parallel, or in combination of series connection and parallel connection.

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

10. The vehicle according to claim 9 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

11. The secondary battery according to claim 1 , wherein the negative electrode comprises a negative electrode active material comprising a titanium-containing oxide.

12. The secondary battery according to claim 1 , wherein a pH of the first aqueous electrolyte is within a range of 10 to 14, and a pH of the second aqueous electrolyte is within a range of 2 to 7.

13. The secondary battery according to claim 1 , wherein the second organic compound comprises at least one selected from the group consisting of acetone, 2-butanone, heptanone, cyclohexanone, formaldehyde, acetaldehyde, propanal, acetophenone, benzaldehyde, and derivatives thereof.

Assignees

• Toshiba Kk

Inventors

• Seki Hayato
• Yoshima Kazuomi
• Matsuno Shinsuke
• Takami Norio

Classifications

• H01M50/209

  adapted for prismatic or rectangular cells (H01M50/216 takes precedence) · CPC title

• H01M50/296

  characterised by terminals of battery packs (terminals of batteries H01M50/543) · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title