Polymer and polymer electrolyte membrane comprising same
The present specification relates to a polymer with improved acid resistance, a polymer electrolyte membrane including the same, a membrane-electrode assembly including the polymer electrolyte membrane, a fuel cell including the membrane-electrode assembly, and a redox flow battery including the polymer electrolyte membrane.
1. A polymer comprising:
a first monomer represented by the following Chemical Formula 1; and
a second monomer which is different from the first monomer and has at least one of fluorine and a trifluoroalkyl group:
in Chemical Formula 1,
A is —SO 3 H, —SO 3 − M + , —COOH, —COO − M + , —PO 3 H 2 , —PO 3 H − M + , —PO 3 2− 2M + , —O(CF 2 ) m SO 3 H, —O(CF 2 ) m SO 3 − M + , —O(CF 2 ) m COOH, —O(CF 2 ) m COO − M + , —O(CF 2 ) m PO 3 H 2 , —O(CF 2 ) m PO 3 H − M + , or —O(CF 2 ) m PO 3 2− 2M + ,
m is an integer from 1 to 6,
M is a Group 1 element,
R1 and R2 are the same as or different from each other, and are each independently a halogen group,
n is an integer from 1 to 10,
when m and n are 2 or more, two or more structures in the parenthesis are the same as or different from each other, and
wherein the second monomer is derived from a compound represented by any one of the following Chemical Formulae 2-1, 2-2, and 3-1 to 3-3:
in Chemical Formulae 2-1, 2-2, and 3-1 to 3-3,
A1′ to A4′ are the same as or different from each other, and are each independently a halogen group.
2. The polymer of claim 1 , wherein the first monomer represented by Chemical Formula 1 is represented by any one of the following Chemical Formulae 1-1 to 1-9:
3. The polymer of claim 1 , wherein the polymer comprises a brancher derived from a compound represented by the following Chemical Formula 4 or a brancher represented by the following Chemical Formula 5:
in Chemical Formulae 4 and 5,
X is S; O; CO; SO; SO 2 ; NR; and a hydrocarbon-based or fluorine-based binder,
l is an integer from 0 to 10,
when l is 2 or more, two or more X's are the same as or different from each other,
Y1 and Y2 are the same as or different from each other, and are each independently NRR; an aromatic ring which is once or twice or more substituted with a substituent selected from the group consisting of a hydroxy group and a halogen group; or an aliphatic ring which is once or twice or more substituted with a substituent selected from the group consisting of a hydroxy group and a halogen group,
R is an aromatic ring substituted with a halogen group; or an aliphatic ring substituted with a halogen group, and
Z is a trivalent organic group.
4. The polymer of claim 3 , wherein the brancher represented by Chemical Formula 5 is any one of the following structures:
5. The polymer of claim 1 , wherein the polymer has a weight average molecular weight of 500 g/mol to 2,000,000 g/mol.
6. The polymer of claim 1 , wherein the polymer is a random polymer.
7. The polymer of claim 1 , wherein the polymer comprises a hydrophilic block and a hydrophobic block, and
the hydrophilic block is a block polymer comprising the first monomer represented by Chemical Formula 1.
8. The polymer of claim 7 , wherein the hydrophilic block and the hydrophobic block in the block polymer are comprised at a molar ratio of 1:0.1 to 1:10.
9. A polymer electrolyte membrane comprising the polymer according to claim 1 .
10. The polymer electrolyte membrane of claim 9 , wherein the polymer electrolyte membrane has ion conductivity of 0.01 S/cm to 0.5 S/cm.
11. The polymer electrolyte membrane of claim 9 , wherein the polymer electrolyte membrane has an ion exchange capacity (IEC) value of 0.01 mmol/g to 5 mmol/s.
12. A membrane-electrode assembly comprising:
an anode;
a cathode; and
the polymer electrolyte membrane of claim 9 disposed between the anode and the cathode.
13. A polymer electrolyte-type fuel cell comprising:
the two or more membrane-electrode assemblies according to claim 12 ;
a stack which comprises a bipolar plate disposed between the membrane-electrode assemblies;
a fuel supplying part which supplies fuel to the stack; and
an oxidizing agent supplying part which supplies an oxidizing agent to the stack.
14. A redox flow battery comprising:
a positive electrode cell comprising a positive electrode and a positive electrode electrolytic solution;
a negative electrode cell comprising a negative electrode and a negative electrode electrolytic solution; and
the polymer electrolyte membrane of claim 9 disposed between the positive electrode cell and the negative electrode cell.
15. A reinforced membrane comprising:
a substrate; and
the polymer according to claim 1 .
16. A membrane-electrode assembly comprising:
an anode;
a cathode; and
the reinforced membrane of claim 15 disposed between the anode and the cathode.
17. A polymer electrolyte-type fuel cell comprising:
the two or more membrane-electrode assemblies according to claim 16 ;
a stack which comprises a bipolar plate disposed between the membrane-electrode assemblies;
a fuel supplying part which supplies fuel to the stack; and
an oxidizing agent supplying part which supplies an oxidizing agent to the stack.
18. A redox flow battery comprising:
a positive electrode cell comprising a positive electrode and a positive electrode electrolytic solution;
a negative electrode cell comprising a negative electrode and a negative electrode electrolytic solution; and
the reinforced membrane of claim 15 disposed between the positive electrode cell and the negative electrode cell.