Flow battery system

Patent metadata

Field	Value
Publication number	US-11791488-B2
Application number	US-202117543771-A
Country	US
Kind code	B2
Filing date	Dec 7, 2021
Priority date	Jul 26, 2016
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

Provided is an electrolyte for a flow battery, the electrolyte being supplied to a flow battery, in which a total concentration of ions of elements of groups 1 to 8 and ions of elements of groups 13 to 16 in the fifth period of the periodic table, and ions of elements of groups 1, 2, and 4 to 8 and ions of elements of groups 13 to 15 in the sixth period of the periodic table, the ions being impurity element ions involved in generation of a gas containing elemental hydrogen, may be 610 mg/L or less and a concentration of vanadium ions may be 1 mol/L or more and 3 mol/L or less.

First claim

The invention claimed is:

1. A flow battery system comprising:
an electrolyte for a flow battery; and
the flow battery to which the electrolyte being supplied,
wherein, in the electrolyte, a total concentration of ions of elements of groups 1 to 8 and ions of elements of groups 13 to 16 in the fifth period of the periodic table, and ions of elements of groups 1, 2, and 4 to 8 and ions of elements of groups 13 to 15 in the sixth period of the periodic table is 610 mg/L or less, the ions being impurity element ions involved in generation of a gas containing elemental hydrogen,
a concentration of vanadium ions is 1 mol/L or more and 3 mol/L or less,
a concentration of free sulfuric acid is 1 mol/L or more and 4 mol/L or less,
a concentration of phosphoric acid is 1.0×10 −4 mol/L or more and 7.1×10 −1 mol/L or less,
a concentration of ammonium is 20 mg/L or less,
a concentration of silicon is 40 mg/L or less,
a concentration of rhenium ions is 0.001 mg/L or more and 5 mg/L or less, and
when a charging and discharging test is performed by circulating and supplying the electrolyte to the flow battery under conditions below, a generation rate of hydrogen is less than 10 cc/h/m 2 and a generation rate of hydrogen sulfide is less than 5.0×10 −3 cc/h/m 2 , the hydrogen and the hydrogen sulfide being generated in a negative electrode of the flow battery during charging and discharging,
(Charge and discharge conditions):
Charge and discharge method: continuous charging and discharging at constant current;
Current density: 70 (mA/cm 2 );
End-of-charge voltage: 1.55 (V)/cell;
End-of-discharge voltage: 1.00 (V)/cell; and
Temperature: room temperature (25° C.).

2. The flow battery system according to claim 1 , wherein a concentration of barium ions is 20 mg/L or less.

3. The flow battery system according to claim 1 , wherein a concentration of molybdenum ions is 510 mg/L or less.

4. The flow battery system according to claim 1 , wherein a concentration of tungsten ions is 30 mg/L or less.

5. The flow battery system according to claim 1 , wherein a concentration of indium ions is 5 mg/L or less.

6. The flow battery system according to claim 1 , wherein a concentration of antimony ions is 10 mg/L or less.

7. The flow battery system according to claim 1 , wherein a concentration of bismuth ions is 20 mg/L or less.

8. The flow battery system according to claim 1 , wherein
a concentration of barium ions is 20 mg/L or less,
a concentration of molybdenum ions is 510 mg/L or less, and
a concentration of tungsten ions is 30 mg/L or less.

9. The flow battery system according to claim 1 , wherein
a concentration of molybdenum ions is 510 mg/L or less,
a concentration of indium ions is 5 mg/L or less,
a concentration of antimony ions is 10 mg/L or less, and
a concentration of bismuth ions is 20 mg/L or less.

10. The flow battery system according to claim 1 , wherein
a concentration of barium ions is 0.001 mg/L or more 20 mg/L or less, and
a concentration of tungsten ions is 0.001 mg/L or more 30 mg/L or less.

11. A flow battery system comprising:
an electrolyte for a flow battery; and
the flow battery to which the electrolyte being supplied,
wherein, in the electrolyte, a total concentration of ions of elements of groups 1 to 8 and ions of elements of groups 13 to 16 in the fifth period of the periodic table, and ions of elements of groups 1, 2, and 4 to 8 and ions of elements of groups 13 to 15 in the sixth period of the periodic table is 610 mg/L or less, the ions being impurity element ions involved in generation of a gas containing elemental hydrogen,
a concentration of vanadium ions is 1 mol/L or more and 3 mol/L or less,
a concentration of free sulfuric acid is 1 mol/L or more and 4 mol/L or less,
a concentration of phosphoric acid is 1.0×10 −4 mol/L or more and 7.1×10 −1 mol/L or less,
a concentration of ammonium is 20 mg/L or less,
a concentration of silicon is 40 mg/L or less,
a concentration of tungsten ions is 0.001 mg/L or more and 30 mg/L or less, and
when a charging and discharging test is performed by circulating and supplying the electrolyte to the flow battery under conditions below, a generation rate of hydrogen is less than 10 cc/h/m 2 and a generation rate of hydrogen sulfide is less than 5.0×10 −3 cc/h/m 2 , the hydrogen and the hydrogen sulfide being generated in a negative electrode of the flow battery during charging and discharging,
(Charge and discharge conditions):
Charge and discharge method: continuous charging and discharging at constant current;
Current density: 70 (mA/cm 2 );
End-of-charge voltage: 1.55 (V)/cell;
End-of-discharge voltage: 1.00 (V)/cell; and
Temperature: room temperature (25° C.).

12. The flow battery system according to claim 11 , wherein a concentration of barium ions is 20 mg/L or less.

13. The flow battery system according to claim 11 , wherein a concentration of molybdenum ions is 510 mg/L or less.

14. The flow battery system according to claim 11 , wherein a concentration of rhenium ions is 5 mg/L or less.

15. The flow battery system according to claim 11 , wherein a concentration of indium ions is 5 mg/L or less.

16. The flow battery system according to claim 11 , wherein a concentration of antimony ions is 10 mg/L or less.

17. The flow battery system according to claim 11 , wherein a concentration of bismuth ions is 20 mg/L or less.

18. The flow battery system according to claim 11 , wherein
a concentration of barium ions is 20 mg/L or less,
a concentration of molybdenum ions is 510 mg/L or less, and
a concentration of rhenium ions is 5 mg/L or less.

19. The flow battery system according to claim 11 , wherein
a concentration of molybdenum ions is 510 mg/L or less,
a concentration of rhenium ions is 5 mg/L or less,
a concentration of indium ions is 5 mg/L or less,
a concentration of antimony ions is 10 mg/L or less, and
a concentration of bismuth ions is 20 mg/L or less.

20. A flow battery system comprising:
an electrolyte for a flow battery; and
the flow battery to which the electrolyte being supplied,
wherein, in the electrolyte, a total concentration of ions of elements of groups 1 to 8 and ions of elements of groups 13 to 16 in the fifth period of the periodic table, and ions of elements of groups 1, 2, and 4 to 8 and ions of elements of groups 13 to 15 in the sixth period of the periodic table is 610 mg/L or less, the ions being impurity element ions involved in generation of a gas containing elemental hydrogen,
a concentration of vanadium ions is 1 mol/L or more and 3 mol/L or less,
a concentration of free sulfuric acid is 1 mol/L or more and 4 mol/L or less,
a concentration of phosphoric acid is 1.0×10 −4 mol/L or more and 7.1×10 −1 mol/L or less,
a concentration of ammonium is 20 mg/L or less,
a concentration of silicon is 40 mg/L or less,
a concentration of barium ions is 0.001 mg/L or more and 20 mg/L or less, and
when a charging and discharging test is performed by circulating and supplying the electrolyte to the flow battery under conditions below, a generation rate of hydrogen is less than 10 cc/h/m 2 and a generation rate of hydrogen sulfide is less than 5.0×10 −3 cc/h/m 2 , the hydrogen and the hydrogen sulfide being generated in a negative electrode of the flow battery during charging and discharging,
(Charge and discharge conditions):
Charge and discharge method: continuous charging and discharging at constant current;
Current density: 70 (mA/cm 2 );
End-of-ch

Assignees

• Sumitomo Electric Industries

Inventors

• Moriuchi Kiyoaki
• Sekine Ryojun
• Sugihara Takayasu

Classifications

• H01M8/188 Primary

  by recharging of redox couples containing fluids; Redox flow type batteries · CPC title

• H01M2300/0008

  Phosphoric acid-based · CPC title

• H01M2300/0011

  Sulfuric acid-based · CPC title

• H01M8/18 Primary

  Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells · CPC title

• Y02E60/50

  Fuel cells · CPC title