Potassium supporting electrolyte enhances stability of Ti-substituted polyoxovanadates for nonaqueous redox flow batteries
Potassium supporting electrolyte enhances stability of Ti-substituted polyoxovanadates for nonaqueous redox flow batteries
复制标题
钾支持电解质增强非水氧化还原液流电池用钛取代多钒酸盐的稳定性
DOI：
10.1039/d3ta06432h
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发表时间：
2024
影响因子：
11.9
通讯作者：
Matson, Ellen M.
中科院分区：
文献类型：
--
作者：
Dagar, Mamta;Brennessel, William W.;Matson, Ellen M.
开发高效和能量密集的电化学储能系统的瓶颈是增强载流子稳定性的策略有限。虽然分子工程可以实现活性材料所需的电化学性能，但了解电解质内物质之间的分子间相互作用可以产生适合实际应用的稳健系统。在这里，我们讨论了支持电解质的抗衡阳离子对二钛取代的多氧钒酸盐-醇盐簇[Ti2V4O5(OMe)14]的电化学稳定性和电池性能的作用。我们的结果说明了与使用碱金属盐、MPF6（M = Li+、K+）和钾衍生的支持电解质相关的独特的阳离子配对效应，从而增强了还原形式的团簇的稳定性。单晶 X 射线衍射研究表明，簇核通过钾原子作为接触离子对连接。这些结果深入了解了支持电解质对多氧钒酸盐电荷载体（电）化学稳定性的作用。
A bottleneck in the development of efficient and energy-dense electrochemical energy storage systems is limited strategies to enhance the stability of the charge carriers. While molecular engineering can allow desirable electrochemical properties of the active material to be achieved, understanding intermolecular interactions among species within the electrolyte can yield robust systems for practical applications. Here, we discuss the role of counter cations of the supporting electrolyte on the electrochemical stability and battery performance of the di-titanium substituted polyoxovanadate–alkoxide cluster, [Ti2V4O5(OMe)14]. Our results illustrate unique cation pairing effects associated with the use of alkali salts, MPF6 (M = Li+, K+), with the potassium-derived supporting electrolyte resulting in enhanced stability of reduced forms of the cluster. Single-crystal X-ray diffraction studies indicate that the cluster cores are linked by potassium atoms as contact ion-pairs. The results provide insight into the role of supporting electrolyte on the (electro)chemical stability of polyoxovanadate charge carriers.