Comparative Analysis of Chemical Redox between Redox Shuttles and a Lithium-Ion Cathode Material via Electrochemical Analysis of Redox Shuttle Conversion
Comparative Analysis of Chemical Redox between Redox Shuttles and a Lithium-Ion Cathode Material via Electrochemical Analysis of Redox Shuttle Conversion
复制标题
DOI：
10.1149/1945-7111/ac0068
复制
发表时间：
2021-05
影响因子：
3.9
通讯作者：
Devanshi Gupta;C. Cai;Gary M. Koenig
中科院分区：
文献类型：
--
作者：
Devanshi Gupta;C. Cai;Gary M. Koenig
氧化还原航天器和锂离子电池颗粒之间的化学氧化还原反应在电化学系统中有应用，包括氧化还原介导型液流电池、光辅助锂离子电池和锂离子电池过充电保护。这些以前的研究，再加上对电池材料的化学氧化还原的兴趣，导致了以前关于固体锂离子材料的化学氧化和/或还原的报道。然而，在许多这些报道中，单一的氧化还原穿梭是研究的焦点和/或实验条件相对有限。在这里，将报告一系列氧化还原航天器与锂离子电池正极材料反应的化学氧化还原研究。我们将使用具有不同半波电位的二茂铁衍生物来探索具有氧化还原穿梭的固体材料的氧化和还原作为时间的函数。通过在定制的电化学池中对氧化还原航天器进行电化学分析来跟踪化学氧化还原的进程，并使用两种不同的模型提取了化学氧化还原的速率常数。这项研究提供了氧化还原穿梭-粒子相互作用对总反应速率起作用的证据，更广泛地支持了这种依赖于电化学分析的实验方法可以用于比较氧化还原穿梭与固体电活性材料的反应。
Chemical redox reactions between redox shuttles and lithium-ion battery particles have applications in electrochemical systems including redox-mediated flow batteries, photo-assisted lithium-ion batteries, and lithium-ion battery overcharge protection. These previous studies, combined with interest in chemical redox of battery materials in general, has resulted in previous reports of the chemical oxidation and/or reduction of solid lithium-ion materials. However, in many of these reports, a single redox shuttle is the focus and/or the experimental conditions are relatively limited. Herein, a study of chemical redox for a series of redox shuttles reacted with a lithium-ion battery cathode material will be reported. Both oxidation and reduction of the solid material with redox shuttles as a function of time will be probed using ferrocene derivatives with different half-wave potentials. The progression of the chemical redox was tracked by using electrochemical analysis of the redox shuttles in a custom electrochemical cell, and rate constants for chemical redox were extracted from the using two different models. This study provides evidence that redox shuttle-particle interactions play a role in the overall reaction rate, and more broadly support that this experimental method dependent on electrochemical analysis can be applied for comparison of redox shuttles reacting with solid electroactive materials.