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Nanoporous Polytetrafluoroethylene/Silica Composite Separator as a High-Performance All-Vanadium Redox Flow Battery Membrane

机译:纳米多孔聚四氟乙烯/二氧化硅复合隔膜,作为高性能全钒氧化还原液流电池膜

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摘要

A novel low-cost nanoporous polytetrafluoroethylene (PTFE)/silica composite separator has been prepared and evaluated for its use in an all-vanadium redox flow battery (VRB). The separator consists of silica particles enmeshed in a PTFE fibril matrix. It possesses unique nanoporous structures with an average pore size of 38 nm and a porosity of 48%. These pores function as the ion transport channels during redox flow battery operation. This separator provides excellent electrochemical performance in the mixed-acid VRB system. The VRB using this separator delivers impressive energy efficiency, rate capability, and temperature tolerance. In additon, the flow cell using the novel separator also demonstrates an exceptional capacity retention capability over extended cycling, thus offering excellent stability for long-term operation. The characteristics of low cost, excellent electrochemical performance and proven chemical stability afford the PTFE/silica nanoporous separator great potential as a substitute for the Nafion membrane used in VRB applications.
机译:新型低成本的纳米多孔聚四氟乙烯(PTFE)/二氧化硅复合隔膜已经制备,并对其在全钒氧化还原液流电池(VRB)中的使用进行了评估。分离器由包裹在PTFE原纤维基质中的二氧化硅颗粒组成。它具有独特的纳米孔结构,平均孔径为38 nm,孔隙率为48%。这些孔在氧化还原液流电池运行期间用作离子传输通道。该隔板在混合酸VRB系统中具有出色的电化学性能。使用该隔板的VRB具有出色的能源效率,速率能力和温度容限。此外,使用新型分离器的流通池在长时间循环中也显示出卓越的容量保持能力,从而为长期运行提供了出色的稳定性。低成本,出色的电化学性能和经过验证的化学稳定性等特性为PTFE /二氧化硅纳米多孔隔膜提供了巨大的潜力,可替代VRB应用中使用的Nafion膜。

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  • 来源
    《Advanced energy materials》 |2013年第9期|1215-1220|共6页
  • 作者单位

    Pacific Northwest National Laboratory P. O. Box 999, Richland, WA 99352, USA;

    Pacific Northwest National Laboratory P. O. Box 999, Richland, WA 99352, USA;

    Pacific Northwest National Laboratory P. O. Box 999, Richland, WA 99352, USA;

    Pacific Northwest National Laboratory P. O. Box 999, Richland, WA 99352, USA;

    Pacific Northwest National Laboratory P. O. Box 999, Richland, WA 99352, USA;

    Pacific Northwest National Laboratory P. O. Box 999, Richland, WA 99352, USA;

    Pacific Northwest National Laboratory P. O. Box 999, Richland, WA 99352, USA;

    Pacific Northwest National Laboratory P. O. Box 999, Richland, WA 99352, USA;

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