Manufacturing mixed fe/v electrolytes for flow batteries

Patent metadata

Field	Value
Publication number	US-2023261232-A1
Application number	US-202217671948-A
Country	US
Kind code	A1
Filing date	Feb 15, 2022
Priority date	Feb 15, 2022
Publication date	Aug 17, 2023
Grant date	—

Abstract

An electrolyte, a method for making the electrolyte, and a flow cell battery are provided. The electrolyte includes about 1.0 molar (M) to about 1.5 M iron ions and about 1.0 M to about 1.5 M vanadium ions.

First claim

What is claimed is:

1 . An electrolyte for a flow cell battery, comprising:
about 1.0 molar (M) to about 1.5 M iron ions; and about 1.0 M to about 1.5 M vanadium ions.

2 . The electrolyte of claim 1 , comprising about 1.25 M iron ions.

3 . The electrolyte of claim 1 , comprising about 1.25 M vanadium ions.

4 . The electrolyte of claim 1 , comprising an equimolar amount of iron ions and vanadium ions.

5 . The electrolyte of claim 1 , comprising about 5 M chloride (Cl − ) to about 8 M Cl − .

6 . The electrolyte of claim 5 , comprising about 6.6 M Cl − .

7 . The electrolyte of claim 1 , comprising about 0.5 M sulfate (SO 4 2− ) to about 1.0 M SO 4 2− .

8 . The electrolyte of claim 7 , comprising about 0.8 M SO 4 2− .

9 . The electrolyte of claim 1 , comprising a base solution comprising hydrochloric acid.

10 . The electrolyte of claim 1 , comprising a catholyte for the flow cell battery.

11 . The electrolyte of claim 1 , comprising an anolyte for a flow cell battery.

12 . A method for preparing an electrolyte for a flow cell battery, comprising:
heating an acid solution; adding a first vanadium salt to the acid solution; adding a second vanadium salt to the acid solution; stirring until both vanadium salts have dissolved; and dissolving an iron salt in the acid solution.

13 . The method of claim 12 , comprising adding iron (II) chloride to the acid solution.

14 . The method of claim 12 , comprising a chemical reaction:
FeCl 2 →Fe 2+ +2Cl − .

15 . The method of claim 12 , comprising dissolving the iron salt to form a solution of between about 1.0 Molar (M) iron ions and about 1.5 M iron ions.

16 . The method of claim 12 , comprising dissolving the iron salt to form a solution of about 1.25 M iron ions.

17 . The method of claim 12 , comprising dissolving a mixture of vanadium (III) oxide (V 2 O 3 ) and vanadium (V) oxide (V 2 O 3 ) in the acid solution.

18 . The method of claim 12 , comprising a chemical reaction:
3V 2 O 3 +V 2 O 5 +20HCl+34H 2 O→4[VO(H 2 O) 5 ] 2+ +4[V(H 2 O) 6 ] 3+ +20Cl −   (1)

19 . The method of claim 12 , comprising dissolving the first vanadium salt and the second vanadium salt to form a solution of between about 1.0 Molar (M) vanadium ions and about 1.5 M vanadium ions.

20 . The method of claim 12 , comprising dissolving the first vanadium salt and the second vanadium salt to form a solution of about 1.25 M vanadium ions.

21 . A flow cell battery, comprising:
an electrochemical cell, wherein the electrochemical cell comprises: an ion exchange membrane; an anode current collector; a cathode current collector, wherein a space between the ion exchange membrane and the anode current collector forms a first channel, a space between the ion exchange membrane and the cathode current collector forms a second channel, and wherein the ion exchange membrane is configured to allow ions to pass between the first channel and the second channel; a first tank configured to flow an anolyte through the first channel at a first rate; and a second tank configured to flow a catholyte through the second channel at a second rate,
wherein the catholyte, or both the catholyte and the anolyte, comprises:
about 1.0 molar (M) to about 1.5 M iron ions; and
about 1.0 M to about 1.5 M vanadium ions.

22 . The flow cell battery of claim 21 , wherein the catholyte, or both the catholyte and anolyte, comprises an equimolar solution of between about 1.25 M and 1.5 M iron ions and between about 1.25 M and 1.5 M vanadium ions.

23 . The flow cell battery of claim 21 , wherein the catholyte, or both the catholyte and anolyte, comprises about 5 M chloride (Cl − ) to about 8 M Cl − .

24 . The flow cell battery of claim 21 , wherein the catholyte, or both the catholyte and anolyte, comprises about 6.6 M Cl − .

25 . The flow cell battery of claim 21 , wherein the catholyte, or both the catholyte and anolyte, comprises about 0.5 M sulfate (SO 4 2− ) to about 1.0 M SO 4 2− .

26 . The flow cell battery of claim 21 , wherein the catholyte, or both the catholyte and anolyte, comprises about 0.8 M SO 4 2− .

27 . The flow cell battery of claim 21 , wherein the first rate is greater than the second rate.

28 . The flow cell battery of claim 21 , wherein the ratio between the first and the second rate is 3:2.

29 . The flow cell battery of claim 21 , wherein both the catholyte and anolyte comprise about 1.25 molar (M) V, about 1.25 M Fe, about 6.6 M Cl − , and about 0.8 M SO 4 2− .

Assignees

• Saudi Arabian Oil Co

Inventors

• Hammad Ahmad D
• Amr Issam T
• Liu Yueqi
• Yang Zhenguo

Classifications

• H01M2300/0005

  Acid electrolytes · CPC title

• H01M8/188 Primary

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

• H01M2300/0011

  Sulfuric acid-based · CPC title

• H01M8/04216

  characterised by the choice for a specific material, e.g. carbon, hydride, absorbent · CPC title

• H01M8/04186

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