Polymer electrolyte membrane, electrochemical cell and flow cell comprising same, method for manufacturing polymer electrolyte membrane, and flow cell electrolyte

Patent metadata

Field	Value
Publication number	US-10826100-B2
Application number	US-201615536867-A
Country	US
Kind code	B2
Filing date	Apr 7, 2016
Priority date	Apr 8, 2015
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

The present specification relates to a polymer electrolyte membrane, an electrochemical battery including the polymer electrolyte membrane, an electrochemical battery module including the electrochemical battery, a flow battery including the polymer electrolyte membrane, a method for manufacturing a polymer electrolyte membrane, and an electrolyte solution for a flow battery.

First claim

The invention claimed is:

1. A polymer electrolyte membrane comprising:
an ion conductive polymer having a thickness,
wherein a cross-over prevention layer is present inside the ion conductive polymer at 10% or more and 90% or less of the thickness of the ion conductive polymer,
wherein the cross-over prevention layer has a thickness of 1 μm or more and 100 μm or less;
wherein the cross-over prevention layer comprises a nitrate of a cationic metal, wherein the cationic metal comprises at least one of tin (Sn), lead (Pb), mercury (Hg), and silver (Ag).

2. The polymer electrolyte membrane of claim 1 , wherein the cross-over prevention layer is parallel to a surface perpendicular to a thickness direction of the polymer electrolyte membrane.

3. An electrochemical battery comprising:
a first electrode;
a second electrode; and
the polymer electrolyte membrane according to claim 1 provided between the first electrode and the second electrode.

4. The electrochemical battery of claim 3 , wherein a cross-over prevention layer of the polymer electrolyte membrane comprises a cationic metal, and
the cationic metal comprises a metal having a standard electrode potential which ranges from a lower standard electrode potential of standard electrode potentials of the first and second electrodes to a higher standard electrode potential of standard electrode potentials of the first and second electrodes.

5. An electrochemical battery module comprising the electrochemical battery of claim 3 as a unit cell.

6. A flow battery comprising:
a first electrode which a first electrolyte solution comprising a first electrode active material is capable of being injected into and discharged from;
a second electrode which a second electrolyte solution comprising a second electrode active material is capable of being injected into and discharged from; and
the polymer electrolyte membrane according to claim 1 which is disposed between the first electrode and the second electrode.

7. The flow battery of claim 6 , wherein at least one of the second electrolyte solution and the first electrolyte solution comprises a cationic metal salt.

8. The flow battery of claim 7 , wherein the cationic metal salt comprises at least one of a nitrate of molybdenum (Mo), tin (Sn), lead (Pb), copper (Cu), mercury (Hg), silver (Ag), or palladium (Pd); a chloride salt of molybdenum (Mo), tin (Sn), lead (Pb), copper (Cu), mercury (Hg), silver (Ag), or palladium (Pd); a sulfide salt of molybdenum (Mo), tin (Sn), lead (Pb), copper (Cu), mercury (Hg), silver (Ag), or palladium (Pd); a sulfate of molybdenum (Mo), tin (Sn), lead (Pb), copper (Cu), mercury (Hg), silver (Ag), or palladium (Pd); and a carbonate of molybdenum (Mo), tin (Sn), lead (Pb), copper (Cu), mercury (Hg), silver (Ag), or palladium (Pd).

9. The flow battery of claim 6 , wherein the first electrode and the second electrode each comprise a carbon felt or a carbon felt comprising a cationic inorganic salt on a surface thereof.

10. The flow battery of claim 9 , wherein when a cationic inorganic salt is provided on a surface of the first electrode carbon felt, a content of the cationic inorganic salt is 0.01 wt % or more and 10 wt % or less based on a weight of the first electrode carbon felt, and
when a cationic inorganic salt is provided on a surface of the second electrode carbon felt, a content of the cationic inorganic salt is 0.01 wt % or more and 10 wt % or less based on a weight of the second electrode carbon felt.

11. A method for manufacturing a polymer electrolyte membrane, the method comprising:
installing an electrochemical battery comprising a first electrode, a second electrode, and a polymer electrolyte membrane provided between the first electrode and the second electrode;
injecting a first electrolyte solution comprising a first electrode active material into a side of the first electrode and injecting a second electrolyte solution comprising a second electrode active material into a side of the second electrode, wherein at least one of the first electrolyte solution and the second electrolyte solution comprises metal cations; and
manufacturing a polymer electrolyte membrane comprising a cross-over prevention layer formed therein, by operating the electrochemical battery to allow the metal cations to permeate into the polymer electrolyte membrane,
wherein the polymer electrolyte membrane comprises:
an ion conductive polymer having a thickness,
wherein a cross-over prevention layer is present inside the ion conductive polymer at 10% or more and 90% or less of the thickness of the ion conductive polymer,
wherein the cross-over prevention layer has a thickness of 1 μm or more and 100 μm or less,
wherein the cross-over prevention layer comprises a nitrate of a cationic metal, wherein the cationic metal comprises at least one of tin (Sn), lead (Pb), mercury (Hg), and silver (Ag).

12. The method of claim 11 , wherein the metal cation comprises a metal having a standard electrode potential which ranges from a lower standard electrode potential of standard electrode potentials of the first and second electrodes to a higher standard electrode potential of standard electrode potentials of the first and second electrodes.

13. The method of claim 11 , wherein the metal cation comprises at least one of a cation of molybdenum (Mo), a cation of tin (Sn), a cation of lead (Pb), a cation of copper (Cu), a cation of mercury (Hg), a cation of silver (Ag), and a cation of palladium (Pd).

14. The method of claim 11 , further comprising:
operating an electrochemical battery comprising a polymer electrolyte membrane comprising a cross-over prevention layer formed therein immediately after the manufacturing of the polymer electrolyte membrane comprising the cross-over prevention layer formed therein.

15. The method of claim 11 , wherein the electrochemical battery is a flow battery in which a first electrolyte comprising a first electrode active material is injected into and discharged from the first electrode and a second electrolyte comprising a second electrode active material is injected into and discharged from the second electrode.

16. A method for manufacturing a polymer electrolyte membrane, the method comprising:
impregnating a polymer electrolyte membrane with a solution comprising metal cations;
installing an electrochemical battery comprising a first electrode, a second electrode, and the polymer electrolyte membrane provided between the first electrode and the second electrode; and
manufacturing a polymer electrolyte membrane comprising a cross-over prevention layer formed therein by operating the electrochemical battery,
wherein the polymer electrolyte membrane comprises:
an ion conductive polymer having a thickness,
wherein a cross-over prevention layer is present inside the ion conductive polymer at 10% or more and 90% or less of the thickness of the ion conductive polymer,
wherein the cross-over prevention layer has a thickness of 1 μm or more and 100 μm or less,
wherein the cross-over prevention layer comprises a nitrate of a cationic metal, wherein the cationic metal comprises at least one of tin (Sn), lead (Pb), mercury (Hg), and silver (Ag).

Assignees

• Lg Chemical Ltd

Inventors

• Lee Jeongbae
• Noh Tae Geun
• Jeong Bong Hyun
• Min Geungi
• Moon Sikwon
• Byun Sujin

Classifications

• C25B9/23

  comprising ion-exchange membranes in or on which electrode material is embedded · CPC title

• H01M8/1048

  Ion-conducting additives, e.g. ion-conducting particles, heteropolyacids, metal phosphate or polybenzimidazole with phosphoric acid · CPC title

• H01M8/1067

  characterised by their physical properties, e.g. porosity, ionic conductivity or thickness · CPC title

• H01M8/0245

  in the form of layered or coated products · CPC title

• H01M8/1055

  Inorganic layers on the polymer electrolytes, e.g. inorganic coatings · CPC title