Ion exchange membrane, electrode, electrochemical cell, and method for manufacturing an ion exchange membrane

Abstract

The present invention provides an ion exchange membrane that has excellent electrolyte resistance and battery characteristics, and facilitates the manufacture of electrochemical cells. [Solution] An ion exchange membrane comprising a polybenzimidazole or a derivative thereof represented by formula (1), wherein the ion exchange membrane comprises a dense layer and a porous layer, the dense layer is provided at either end of the porous layer, and the thickness of the dense layer is 0.1 to 10 μm. JPEG2026104048000009.jpg46146 (In general formula (1), R 1 R is a tetravalent aromatic unit that can form an imidazole ring. 2 (where X represents a divalent aromatic group, and Y represents a group containing an anionic functional group, and Y represents a group containing a hydrogen atom or a cationic functional group.)

Claims

1. An ion exchange membrane comprising polybenzimidazoles or derivatives thereof as shown in Formula 1 below, The ion exchange membrane is It comprises a dense layer and a porous layer, The dense layer is provided at one end of the porous layer, An ion exchange membrane characterized in that the thickness of the dense layer is 0.1 μm or more and 10 μm or less. 【Chemistry 1】 (In general formula (1), R １ R is a tetravalent aromatic unit that can form an imidazole ring. ２ (where X represents a divalent aromatic group, and Y represents a group containing an anionic functional group, and Y represents a group containing a hydrogen atom or a cationic functional group.)

2. The ion exchange membrane according to claim 1, wherein the ion exchange capacity is 0.8 meq / g or more and 3.5 meq / g or less.

3. The ion exchange membrane according to claim 1 or 2, wherein the thickness of the porous layer is 10 μm or more and 50 μm or less.

4. The ion exchange membrane according to claim 1 or 2, wherein the anionic functional group comprises at least one sulfonic acid group or one phosphonic acid group.

5. The ion exchange membrane according to claim 1 or 2, wherein the cationic functional group is a quaternary ammonium compound.

6. The ion exchange membrane according to claim 1 or 2, wherein the molecular weight of the polybenzimidazole or its derivative is 1,000 or more and 1,000,000 or less.

7. The ion exchange membrane according to claim 1 or 2, wherein the polybenzimidazoles or derivatives thereof include random polymers and / or alternating polymers and / or block polymers.

8. An electrode characterized by comprising an ion exchange membrane as described in claim 1 or 2.

9. An electrochemical cell characterized by comprising the electrode described in claim 8.

10. A method for producing an ion exchange membrane according to claim 1 or 2, (a) A step of introducing an ion exchange group into a polybenzimidazole or its derivative, (b) A step of dissolving the polybenzimidazole or derivative thereof into which the ion exchange group has been introduced by adding a solvent and a non-solvent, (c) A step of manufacturing an asymmetric film using the solution obtained in (b), Equipped with, A method for producing an ion exchange membrane, characterized in that, in step (b) above, the polybenzimidazoles or their derivatives are dissolved in an amount of 8% by mass or more and 30% by mass or less.

11. The method for producing an ion exchange membrane according to claim 10, wherein in step (c) above, the thickness during casting is 100 μm or more and 500 μm or less.

12. The method for producing an ion exchange membrane according to claim 10, wherein in step (b), the ratio of the amount of polybenzimidazoles or derivatives thereof added to the non-solvent is 1.5:0.5 to 1.0:3.0.

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