Multielectron Cycling of a Low-Potential Anolyte in Alkali Metal Electrolytes for Nonaqueous Redox Flow Batteries,ACS Energy Letters

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Multielectron Cycling of a Low-Potential Anolyte in Alkali Metal Electrolytes for Nonaqueous Redox Flow Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-09-20 00:00:00 , DOI: 10.1021/acsenergylett.7b00559
Koen H. Hendriks _{1,

2} , Christo S. Sevov _{1,

2} , Monique E. Cook _{1,

2} , Melanie S. Sanford _{1,

2}

Affiliation

Recent efforts have led to the design of new anolytes for nonaqueous flow batteries that exhibit reversible redox couples at low potentials. However, these molecules generally cycle through just a single electron-transfer event, which limits the overall energy density of resulting batteries on account of the undesirably high equivalent weight (i.e., ratio of anolyte/supporting electrolyte molecular weight to electrons transferred). In addition, these anolytes generally require expensive alkylammonium salts as supporting electrolytes for stable cycling, which further increases the equivalent weight of the system. The current work describes the multielectron redox cycling of a low-potential anolyte using alkali metal salts as supporting electrolytes. These studies reveal that potassium hexafluorophosphate (KPF₆) dramatically lowers the equivalent weight of the anolyte system while supporting flow cell cycling through two redox events at low potentials for 150 cycles with no detectable degradation.

中文翻译：

非水氧化还原液流电池中碱金属电解质中低电位阳极电解液的多电子循环

最近的努力导致了用于非水流电池的新型阳极电解液的设计，该电解液在低电势下具有可逆的氧化还原对。然而，这些分子通常仅通过单个电子转移事件而循环，这由于不希望的高当量重量（即，阳极电解液/支持电解质的分子量与转移的电子之比）而限制了所得电池的总能量密度。此外，这些阳极电解液通常需要昂贵的烷基铵盐作为稳定循环的支持电解质，这进一步增加了系统的当量。当前的工作描述了使用碱金属盐作为支持电解质的低电位阳极电解液的多电子氧化还原循环。这些研究表明六氟磷酸钾（KPF ₆）大大降低了阳极电解液系统的当量，同时支持流动池在低电势下通过两个氧化还原事件循环150个循环而没有可检测到的降解。

更新日期：2017-09-20

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