AQUEOUS SOLUTION ELECTROLYTE SECONDARY BATTERY

• US 20200136136A1
• Filed: 03/08/2018
• Published: 04/30/2020
• Est. Priority Date: 03/15/2017
• Status: Active Grant

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation), Tokyo Denki University
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: NITTA, Koji, SAKAI, Shoichiro, FUKUNAGA, Atsushi, OKUNO, Kazuki, YABUUCHI, Naoaki
• Granted Patent: US 11,189,830 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/36 Accumulators not provided for in groups H01M10/05-H01M10/34
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2300/0002 Aqueous electrolytes
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An aqueous solution electrolyte secondary battery includes: a positive electrode including a positive electrode active material that reversibly occludes and releases lithium ions; a negative electrode including a negative electrode active material that reversibly occludes and releases lithium ions; and an aqueous solution electrolyte in which a lithium salt is dissolved. The negative electrode active material contains Mo, at least part of the Mo causes an oxidation-reduction reaction of Mo³⁺/Mo⁶⁺ through charging and discharging, and a potential window for charging and discharging exceeds 2.0 V.

Claims

1. An aqueous solution electrolyte secondary battery comprising:

a positive electrode including a positive electrode active material that reversibly occludes and releases lithium ions;

a negative electrode including a negative electrode active material that reversibly occludes and releases lithium ions; and

an aqueous solution electrolyte in which a lithium salt is dissolved, wherein

the negative electrode active material contains Mo,

at least part of the Mo causes an oxidation-reduction reaction of Mo³⁺/Mo⁶⁺ through charging and discharging, and

a potential window for charging and discharging exceeds 2.0 V.

2. The aqueous solution electrolyte secondary battery according to claim 1, wherein the negative electrode active material contains a complex oxide containing tetravalent or higher transition metal Me, trivalent Mo, and Li.

3. The aqueous solution electrolyte secondary battery according to claim 2, wherein

the complex oxide contains at least one single-phase oxide selected from the group consisting of single-phase oxides having compositions of

formula [1]:

xLiMoO₂-(1−

x)Li₃NbO₄,

formula [2];

xLiMoO₂-(1−

x)Li₄MoO₅, and

formula [3];

xLiMoO₂-(1−

x)Li₂TiO₃, and

formulas [1] to [3] satisfy 0<

x<

1.

4. The aqueous solution electrolyte secondary battery according to claim 1, wherein the aqueous solution electrolyte contains a lithium bis(perfluoroalkylsulfonyl)imide as at least part of the lithium salt.

5. The aqueous solution electrolyte secondary battery according to claim 1, wherein at least part of the aqueous solution electrolyte forms a room temperature molten hydrate.

7. The aqueous solution electrolyte secondary battery according to claim 1, wherein

the positive electrode includes a positive electrode current collector and a positive electrode mixture including the positive electrode active material supported on the positive electrode current collector,

the negative electrode includes a negative electrode current collector and a negative electrode mixture including the negative electrode active material supported on the negative electrode current collector, and

at least one of the positive electrode current collector and the negative electrode current collector has a three-dimensional network metallic skeleton.

6. An aqueous solution electrolyte secondary battery comprising:

a positive electrode including a positive electrode active material that reversibly occludes and releases lithium ions;

a negative electrode including a negative electrode active material that reversibly occludes and releases lithium ions; and

an aqueous solution electrolyte in which a lithium salt is dissolved, wherein

the negative electrode active material contains Mo,

at least part of the Mo causes an oxidation-reduction reaction of Mo³⁺/Mo⁶⁺ through charging and discharging, and

at least part of the aqueous solution electrolyte forms a room temperature molten hydrate.

8. The aqueous solution electrolyte secondary battery according to claim 6, wherein

the positive electrode includes a positive electrode current collector and a positive electrode mixture including the positive electrode active material supported on the positive electrode current collector,

the negative electrode includes a negative electrode current collector and a negative electrode mixture including the negative electrode active material supported on the negative electrode current collector, and

at least one of the positive electrode current collector and the negative electrode current collector has a three-dimensional network metallic skeleton.