Electrolyte for flow battery and flow battery system

Patent metadata

Field	Value
Publication number	US-2019280324-A1
Application number	US-201716319186-A
Country	US
Kind code	A1
Filing date	May 17, 2017
Priority date	Jul 26, 2016
Publication date	Sep 12, 2019
Grant date	—

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, is 610 mg/L or less, 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, and a concentration of silicon is 40 mg/L or less. When a charging and discharging test is performed by circulating and supplying the electrolyte to the flow battery under specific conditions, 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.

First claim

1 . An electrolyte for a flow battery, the electrolyte being supplied to a flow battery,
wherein 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, is 610 mg/L or less, 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, 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 electrolyte for a flow battery according to claim 1 , wherein a concentration of barium ions, which are impurity element ions involved in generation of a gas containing elemental hydrogen, is 20 mg/L or less.

3 . The electrolyte for a flow battery according to claim 1 , wherein a concentration of molybdenum ions, which are impurity element ions involved in generation of a gas containing elemental hydrogen, is 510 mg/L or less.

4 . The electrolyte for a flow battery according to claim 1 , wherein a concentration of tungsten ions, which are impurity element ions involved in generation of a gas containing elemental hydrogen, is 30 mg/L or less.

5 . The electrolyte for a flow battery according to claim 1 , wherein a concentration of rhenium ions, which are impurity element ions involved in generation of a gas containing elemental hydrogen, is 5 mg/L or less.

6 . The electrolyte for a flow battery according to claim 1 , wherein a concentration of indium ions, which are impurity element ions involved in generation of a gas containing elemental hydrogen, is 5 mg/L or less.

7 . The electrolyte for a flow battery according to claim 1 , wherein a concentration of antimony ions, which are impurity element ions involved in generation of a gas containing elemental hydrogen, is 10 mg/L or less.

8 . The electrolyte for a flow battery according to claim 1 , wherein a concentration of bismuth ions, which are impurity element ions involved in generation of a gas containing elemental hydrogen, is 20 mg/L or less.

9 . A flow battery system comprising the electrolyte for a flow battery according to claim 1 , and a flow battery to which the electrolyte for a flow battery is supplied.

Assignees

• Sumitomo Electric Industries

Inventors

• Moriuchi Kiyoaki
• Sekine Ryojun
• Sugihara Takayasu

Classifications

• H01M2300/0008

  Phosphoric acid-based · CPC title

• H01M2300/0011

  Sulfuric acid-based · CPC title

• H01M8/04276

  Arrangements for managing the electrolyte stream, e.g. heat exchange · CPC title

• H01M8/02

  Details (electrodes H01M4/86 - H01M4/98) · CPC title

• H01M8/04186 Primary

  of liquid-charged or electrolyte-charged reactants · CPC title