전 바나듐계 레독스-흐름전지용 격막으로 폴리에틸렌 대칭막과 비대칭막을 사용하여 기상 중에서 클로로술폰화반응으로 제막하였다. 제막된 대칭막의 2 M KCl 수용액에서의 막저항은 반응시간 120분의 막에서 0.5 Ω·㎠이었고 비대칭막의 경우 1.0 Ω·㎠까지 감소하였다. 그리고 제조한 막을 레독스-흐름 전지의 격막으로 사용하여 충방전시 전기저항을 측정한 결과 대칭막이 비대칭막보다 낮은 전기저항을 나타내었고, 산성의 바나듐수용액에 침적하여 측정한 내구성은 대칭막과 비대칭막의 경우 각각 약 3개월 정도의 비슷한 수명을 나타내었다.

Chlorosulfonated homogeneous and asymmetric membranes were tested as separator for the all vanadium redox-flow battery. The membranes were prepared by chlorosulfonation of the polyethylene film in vapor phase. In the case of a homogeneous membrane, area resistivity of 0.5 Ω·cm² in 2M KCl aqueous solution was obtained at chlorosulfonation time of 120 min. In the case of an asymmetric membrane, area resistivity 1.0 Ω·cm² in 2M KCl aquous solution was reached at chlorosulfonation time of 120 min. The electrical resistance of membranes in the redox-flow battery were also measured. The electrical resistance of homogeneous membrane has a lower value than that of an asymmetric membrane. The durability of chlorosulfonated homogeneous and asymmetric membrane which is determined by the oxidation degradation in acidic vanadium solution, was 3 months, respectively.

All-vanadium Redox-flow Battery Chlorosulfonation Membrane Resistance PE-film Durability

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