Lithium‐selective membranes are important to prevent undesirable effects of electrode cross‐talk in Li−S and Li−O₂ cells, such as crossover of redox species from the cathode to the anode. This work reports a novel approach to evaluate their selectivity in operando, under practically relevant conditions, including application of a current through the membrane. The method is illustrated with a lithiated Nafion membrane, immersed in 1 molal LiTFSI in diglyme containing 0.1 molal LiI as a model crossover species, and an accurate evaluation of the transference number of crossover species is reported ). It is also shown that the standard ex‐situ methods for evaluating membrane selectivity, as applied without a current passing through the membrane, provide a considerable overestimation of the capability of the membrane to block crossover species.

中文翻译：

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锂电导膜的选择性和转移数的操作性评价

锂选择性膜对于防止Li-S和Li-O ₂电池中电极串扰的不良影响非常重要，例如氧化还原物质从阴极到阳极的交叉。这项工作报告了一种新颖的方法来评估其在实际相关条件下的操作选择性，包​​括施加电流通过膜。用锂化的Nafion膜说明该方法，将其浸入1摩尔LiTFSI的二甘醇二甲醚中，该二甘醇含有0.1摩尔LiI作为模型交叉物种，并据报道准确评估了交叉物种的转移数 ）。还显示出，在没有电流通过膜的情况下应用的用于评估膜选择性的标准异位方法可大大高估膜阻挡交叉物质的能力。