Synthesis, computational and electrochemical characterization of a family of functionalized dimercaptothiophenes for potential use as high-energy cathode materials for lithium/lithium-ion batteries
作者:Yasuyuki Kiya、Jay C. Henderson、Geoffrey R. Hutchison、Héctor D. Abruña
DOI:10.1039/b707235j
日期:——
We present a family of a novel class of organosulfur compounds based on dimercaptothiophene and its derivatives, with a variety of functional groups (electron-donating or electron-withdrawing groups) and regiochemistries, designed as potential high-energy cathode materials with sufficient charge/discharge cyclability for lithium/lithium-ion rechargeable batteries. This study uses as a point of departure the electrochemical and computational understanding of the electrocatalytic effect of poly(3,4-ethylenedioxythiophene) (PEDOT) towards the redox reactions of 2,5-dimercapto-1,3,4-thiadiazole (DMcT). The effective redox potentials of these materials exhibited good correlation with the highest-occupied molecular orbital (HOMO) levels predicted via computational modeling. Furthermore, the redox reactions of all the compounds studied were electrocatalytically accelerated at PEDOT film-coated glassy carbon electrodes (GCEs), although some materials exhibited higher energy output than others. By using this approach we have identified several compounds that exhibit clear promise as potential cathode materials and have characterized the molecular interactions between the organosulfur compounds and PEDOT film surfaces involved in the electrocatalytic reactions.
我们提出了一类基于二巯基噻吩及其衍生物的新型有机硫化合物家族,这些化合物具有多种功能团(电子供体或电子受体基团)和区域化学特性,旨在作为潜在的高能阴极材料,具备足够的充放电循环能力,以用于锂/锂离子可充电电池。本研究的出发点是对聚(3,4-亚乙基双氧噻吩)(PEDOT)在2,5-二巯基-1,3,4-噻二唑(DMcT)氧化还原反应中的电催化效应进行电化学和计算理解。这些材料的有效氧化还原电位与通过计算建模预测的最高占据分子轨道(HOMO)能级表现出良好的关联。此外,所有研究的化合物在PEDOT膜涂覆的玻碳电极(GCEs)上进行的氧化还原反应均被电催化加速,尽管某些材料的能量输出高于其他材料。通过这种方法,我们识别出了几种表现出明显潜力作为阴极材料的化合物,并表征了参与电催化反应的有机硫化合物与PEDOT膜表面之间的分子相互作用。