US 11,791,488 B2
Flow battery system
Kiyoaki Moriuchi, Osaka (JP); Ryojun Sekine, Osaka (JP); and Takayasu Sugihara, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Filed by Sumitomo Electric Industries, Ltd., Osaka (JP)
Filed on Dec. 7, 2021, as Appl. No. 17/543,771.
Application 17/543,771 is a continuation in part of application No. 16/319,186, granted, now 11,233,253, previously published as PCT/JP2017/018548, filed on May 17, 2017.
Claims priority of application No. 2016-146799 (JP), filed on Jul. 26, 2016.
Prior Publication US 2022/0093955 A1, Mar. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 8/18 (2006.01)
CPC H01M 8/188 (2013.01) [H01M 2300/0008 (2013.01); H01M 2300/0011 (2013.01)] 20 Claims
OG exemplary drawing
 
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/m2 and a generation rate of hydrogen sulfide is less than 5.0×10−3 cc/h/m2, 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/cm2);
End-of-charge voltage: 1.55 (V)/cell;
End-of-discharge voltage: 1.00 (V)/cell; and
Temperature: room temperature (25° C.).