A Unique Single‐Ion Mediation Approach for Crossover‐Free Nonaqueous Redox Flow Batteries with a Na+‐Ion Solid Electrolyte,Small Methods

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A Unique Single‐Ion Mediation Approach for Crossover‐Free Nonaqueous Redox Flow Batteries with a Na+‐Ion Solid Electrolyte
Small Methods ( IF 10.7 ) Pub Date : 2019-11-13 , DOI: 10.1002/smtd.201900697
Xingwen Yu ₁ , Wiley A. Yu ₁ , Arumugam Manthiram ₁

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Nonaqueous redox flow batteries (RFBs) provide significant advantages over aqueous RFBs because the use of nonaqueous electrolytes offers the possibilities of operating RFBs at higher voltages (above the water break‐down voltage) and low temperatures (below 0 °C, the freezing point of H₂O). However, the advancement of RFBs has long been plagued by the chemical‐crossover problem due to a lack of reliable separators. Herein, a single‐ion mediation strategy is presented for the advancement of nonaqueous RFBs by employing a Na⁺‐ion solid electrolyte. The catholyte and anolyte in a single cell are physically and electrically separated, but the redox reactions at the cathode and anode are ionically linked by sodium ions, which shuttle between the catholyte and anolyte through the solid electrolyte. To accommodate the mediating Na⁺‐ions, both the catholyte and anolyte are well managed through the addition of appropriate supporting electrolytes. The proposed unique RFB concept is validated with a chromium (III) acetylacetonate symmetric redox chemistry and the nitrobenzene–bromine redox couple.

中文翻译：

具有Na +离子固体电解质的无交叉非水氧化还原液流电池的独特单离子介导方法

与使用水性RFB相比，非水性氧化还原液流电池（RFB）具有明显的优势，因为使用非水性电解质可以在更高的电压（水击穿电压以上）和低温（0°C以下，冰点的凝固点）下操作RFB。 H ₂ O）。但是，由于缺乏可靠的分离器，RFB的发展长期以来一直受到化学交叉问题的困扰。在本文中，提出了一种通过使用Na ⁺促进非水RFB进步的单离子介导策略。离子固体电解质。单个电池中的阴极电解液和阳极电解液在物理上和电气上是分开的，但是阴极和阳极处的氧化还原反应通过钠离子离子连接，钠离子在阴极电解液和阳极电解液之间通过固体电解质穿梭。为了容纳介导的Na ⁺离子，通过添加适当的支持电解质，可以很好地管理阴极电解液和阳极电解液。提议的独特RFB概念已通过乙酰丙酮铬（III）对称氧化还原化学方法和硝基苯-溴氧化还原对进行了验证。

更新日期：2019-11-13

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