Secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-10461370-B2
Application number	US-201715444945-A
Country	US
Kind code	B2
Filing date	Feb 28, 2017
Priority date	Sep 16, 2016
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

According to one embodiment, a secondary battery is provided. The secondary battery includes a positive electrode, a negative electrode, and an electrolyte. The electrolyte contains a water-containing solvent and a nitrogen atom-containing organic sulfur compound. The concentration of the nitrogen atom-containing organic sulfur compound in the electrolyte is within a range of from 0.001 mM to 20 mM.

First claim

What is claimed is:

1. A secondary battery, comprising:
a positive electrode;
a negative electrode; and
an electrolyte,
wherein:
the electrolyte comprises a water-containing solvent, an electrolyte salt, and a nitrogen atom-containing organic sulfur compound;
the electrolyte is situated between and around the positive electrode and the negative electrode; and
a concentration of the nitrogen atom-containing organic sulfur compound in the electrolyte is within a range of from 0.001 mM to 20 mM.

2. The secondary battery according to claim 1 , wherein the nitrogen atom-containing organic sulfur compound comprises at least one selected from the group consisting of a sulfide compound, a disulfide compound, a thiol compound, a sulfenic acid compound, a sulfinic acid compound, a thiocarbonyl compound, a sulfimide compound, a sulfoxide compound, a sulfone compound, and a sulfonic acid compound.

3. The secondary battery according to claim 1 , wherein the nitrogen atom-containing organic sulfur compound is at least one selected from the group consisting of saccharin sodium salt, thiourea, 2-aminoethanethiol hydrochloride, 2-amino alkyl sulfone hydrochloride, derivatives of 2-mercaptobenzothiazole sulfonate, cystine, aminoacetonitrile sulfate, and 1,3-diisothiocyanate propane.

4. The secondary battery according to claim 1 , wherein the electrolyte salt comprises a lithium salt and a concentration of the lithium salt in the electrolyte is within a range of from 3 M to 10 M.

5. The secondary battery according to claim 4 , wherein the lithium salt is lithium chloride.

6. The secondary battery according to claim 1 , wherein the negative electrode has a specific surface area of from 3 m 2 /g to 50 m 2 /g.

7. The secondary battery according to claim 1 , wherein the negative electrode comprises at least one selected from the group consisting of a titanium oxide, a niobium titanium oxide, a sodium niobium titanium oxide and a lithium titanium oxide as a negative electrode active material.

8. The secondary battery according to claim 1 , wherein the positive electrode comprises at least one selected from the group consisting of a lithium cobalt composite oxide, a lithium manganese composite oxide, and a lithium phosphate compound having an olivine structure as a positive electrode active material.

9. A battery pack, comprising the secondary battery according to claim 1 .

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

11. The battery pack according to claim 9 , comprising a plural of the secondary batteries, wherein the secondary batteries are electrically connected in series, in parallel, or in a combination of in series and in parallel.

12. A vehicle, comprising the battery pack according to claim 9 .

13. The vehicle according to claim 12 , wherein the battery pack is configured to recover a regenerative energy caused by power of the vehicle.

14. The secondary battery according to claim 1 , wherein the water-containing solvent comprises 50% by volume or more of water.

15. The secondary battery according to claim 1 , wherein:
the water-containing solvent comprises 50% by volume or more of water;
the nitrogen atom-containing organic sulfur compound is at least one selected from the group consisting of saccharin sodium salt, thiourea, 2-aminoethanethiol hydrochloride, 2-amino alkyl sulfone hydrochloride, derivatives of 2-mercaptobenzothiazole sulfonate, cystine, aminoacetonitrile sulfate, and 1,3-diisothiocyanate propane;
the positive electrode comprises at least one selected from the group consisting of a lithium cobalt composite oxide, a lithium manganese composite oxide, and a lithium phosphate compound having an olivine structure as a positive electrode active material; and
the negative electrode comprises at least one selected from the group consisting of a titanium oxide, a lithium titanium oxide, a niobium titanium oxide and a sodium niobium titanium oxide as a negative electrode active material.

16. The secondary battery according to claim 1 , wherein the nitrogen atom-containing organic sulfur compound is at least one selected from the group consisting of saccharin sodium salt, 2-aminoethanethiol hydrochloride, 2-amino alkyl sulfone hydrochloride, derivatives of 2-mercaptobenzothiazole sulfonate, cystine, aminoacetonitrile sulfate, and 1,3-diisothiocyanate propane.

Assignees

• Toshiba Kk

Inventors

• Hotta Yasuyuki
• Matsuno Shinsuke
• Takami Norio

Classifications

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · 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

• H01M10/38 Primary

  Construction or manufacture · CPC title