LOW PERMEABILITY POLYBENZIMIDAZOLE (PBI) MEMBRANES FOR REDOX FLOW BATTERIES
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机译:用于氧化还原液的低渗透性聚苯并咪唑(PBI)膜
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摘要
Disclosed are redox flow battery membranes, redox flow batteries incorporating the membranes, and methods of forming the membranes. The membranes include a densified polybenzimidazole gel membrane that is capable of incorporating a high liquid content without loss of structure that is formed according to a process that includes in situ hydrolysis of a polyphosphoric acid solvent followed by densification of the gel membrane. The densified membranes are then imbibed with a redox flow battery supporting electrolyte such as sulfuric acid and can operate at very high ionic conductivities of about 50 mS/cm or greater and with low permeability of redox couple ions, e.g. vanadium ions, of about 10-7 cm2/s or less. Redox flow batteries incorporating the membranes can operate at current densities of about 50 mA/cm2 or greater.
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机译:公开了氧化还原液流电池膜,结合有该膜的氧化还原液流电池以及形成膜的方法。所述膜包括致密的聚苯并咪唑凝胶膜,该膜能够掺入高液体含量而不会损失根据包括对多磷酸溶剂进行原位水解然后将其稠化的方法形成的结构的结构。凝胶膜。然后,致密化的膜吸收有支持电解质(例如硫酸)的氧化还原液流电池,并且可以在约50 mS / cm或更高的非常高的离子电导率下运行,并且氧化还原对离子的渗透率低,例如,钒离子,约为10 -7 Sup> cm 2 Sup> / s或更低。装有隔膜的氧化还原液流电池可以在约50 mA / cm 2 Sup>或更高的电流密度下工作。
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