Secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2023024211-A1
Application number	US-202217650547-A
Country	US
Kind code	A1
Filing date	Feb 10, 2022
Priority date	Jul 16, 2021
Publication date	Jan 26, 2023
Grant date	—

Abstract

According to one embodiment, a secondary battery is provided. The secondary battery includes: a positive electrode containing a positive electrode active material; a negative electrode; a separator arranged between the positive electrode and the negative electrode; and a first aqueous electrolyte held in at least the positive electrode. pH of the first aqueous electrolyte is more than 7. The positive electrode active material contains a lithium-containing compound that exhibits an average operating potential of less than 4.0 V based on lithium metal.

First claim

1 . A secondary battery comprising:
a positive electrode that comprises a positive electrode active material; a negative electrode; a separator disposed between the positive electrode and the negative electrode; and a first aqueous electrolyte held in at least the positive electrode, wherein pH of the first aqueous electrolyte exceeds 7, and the positive electrode active material comprises a lithium-containing compound that exhibits an average operating potential of less than 4.0 V based on lithium metal.

2 . The secondary battery according to claim 1 ,
wherein the pH of the first aqueous electrolyte is 8.0 or more.

3 . The secondary battery according to claim 1 ,
wherein the pH of the first aqueous electrolyte is 13.0 or more.

4 . The secondary battery according to claim 1 , wherein the lithium-containing compound is at least one selected from the group consisting of a lithium nickel composite oxide, a lithium cobalt composite oxide, a lithium nickel cobalt composite oxide, a lithium manganese cobalt composite oxide, a lithium phosphorus oxide having an olivine structure, a lithium nickel cobalt manganese composite oxide, and a lithium vanadium phosphorus oxide.

5 . The secondary battery according to claim 1 ,
wherein the separator comprises a solid electrolyte membrane comprising a solid electrolyte that has lithium ion conductivity of 1×10-10 S/cm or more at 25° C. and a porous sheet in which a permeability coefficient ranges from 1×10-19 m2 or more to less than 1×10-15 m2.

6 . The secondary battery according to claim 5 ,
wherein the separator comprises a composite solid electrolyte membrane in which the solid electrolyte membrane is stacked on at least one main surface of the porous sheet.

7 . The secondary battery according to claim 6 ,
wherein a permeability coefficient of the composite solid electrolyte membrane ranges from 1×10-19 m2 or more to less than 1×10-15 m2.

8 . The secondary battery according to claim 1 ,
wherein the separator comprises a solid electrolyte membrane comprising a solid electrolyte that has lithium ion conductivity of 1×10-10 S/cm or more at 25° C.

9 . The secondary battery according to claim 1 ,
wherein the separator comprises a porous sheet in which a permeability coefficient ranges from 1×10-19 m2 or more to less than 1×10-15 m2.

10 . The secondary battery according to claim 1 , further comprising a second aqueous electrolyte held in at least the negative electrode,
wherein pH of the second aqueous electrolyte is 8.0 or more.

11 . The secondary battery according to claim 10 , wherein the pH of the second aqueous electrolyte is 13.0 or more.

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

13 . The battery pack according to claim 12 , further comprising:
an external power distribution terminal; and a protective circuit.

14 . The battery pack according to claim 12 , comprising a plurality of the secondary battery, wherein the secondary batteries are electrically connected in series, in parallel, or in combination of in series and in parallel.

15 . A vehicle comprising the battery pack according to claim 14 .

16 . The vehicle according to claim 15 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Seki Hayato
• Kuboki Takashi
• Matsuno Shinsuke

Classifications

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/525 Primary

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

• H01M2300/0094

  in the form of layered products, e.g. coatings · CPC title