Secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-11024879-B2
Application number	US-201815911959-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Sep 20, 2017
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

According to one embodiment, a secondary battery is provided. The secondary battery includes a positive electrode, a negative electrode, and an aqueous electrolyte containing alkali metal ions. The aqueous electrolyte contains an organic compound containing a carboxyl group or carboxylate group and a hydroxyl group. The pH of the aqueous electrolyte is 0 or less. The ratio of the weight of the organic compound to the weight of the aqueous electrolyte is within a range of 0.01% by weight to 6.5% by weight. The number of carbon atoms in the organic compound is 5 or more.

First claim

What is claimed is:

1. A secondary battery comprising a positive electrode, a negative electrode, and an aqueous electrolyte comprising alkali metal ions,
wherein the aqueous electrolyte comprises an organic compound comprising a carboxyl group or carboxylate group and a hydroxyl group, a pH of the aqueous electrolyte is 0 or less,
a ratio of a weight of the organic compound to a weight of the aqueous electrolyte is within a range of 0.01% by weight to 6.5% by weight,
a number of carbon atoms in the organic compound is 5 or more, and
the alkali metal ions comprise lithium ions, and a molar concentration of the lithium ions in the aqueous electrolyte is 6 M or more.

2. The secondary battery according to claim 1 ,
wherein the negative electrode comprises a negative electrode current collector, and the negative electrode current collector comprises zinc.

3. The secondary battery according to claim 1 ,
wherein a ratio NH/NC of a number NH of the hydroxyl group comprised in one molecule of the organic compound to a number NC of the carboxyl group or carboxylate group comprised in one molecule of the organic compound is within a range of 0.3 to 5.

4. The secondary battery according to claim 1 ,
wherein the number of carbon atoms in the organic compounds is 7 or less.

5. The secondary battery according to claim 1 ,
wherein the alkali metal ions are lithium ions, and
the molar concentration of the lithium ions in the aqueous electrolyte is 9 M or more.

6. The secondary battery according to claim 1 ,
wherein the organic compound is at least one compound selected from a group consisting of glucono-δ-lactone and citric acid.

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

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

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

12. The secondary battery according to claim 1 ,
wherein the molar concentration of the lithium ions in the aqueous electrolyte is 6 M or more and 12 M or less.

13. The secondary battery according to claim 1 ,
wherein the positive electrode comprises a positive electrode active material comprising at least one selected from a group consisting of a lithium manganese composite oxide having a spinel structure, a lithium nickel composite oxide, a lithium cobalt composite oxide, lithium nickel cobalt composite oxide, lithium manganese nickel composite oxide having a spinel structure, lithium manganese cobalt composite oxide, lithium iron phosphates, and lithium nickel cobalt manganese composite oxide.

14. The secondary battery according to claim 1 ,
wherein the negative electrode comprises a negative electrode active material comprising a titanium-containing oxide, and
the titanium-containing oxide comprises at least one selected from a group consisting of titanium oxide, lithium-titanium oxide, niobium titanium oxide and orthorhombic titanium composite oxide.

Assignees

• Toshiba Kk

Inventors

• Sekiguchi Yumiko
• Matsuno Shinsuke
• Seki Hayato

Classifications

• Y02P70/50

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

• H01M10/0566 Primary

  Liquid materials · CPC title

• H01M12/08 Primary

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• H01M10/0525

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

• H01M10/0563 Primary

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