Quantitative Molecular-Level Understanding of Electrochemical Aluminum-Ion Intercalation into a Crystalline Battery Electrode
Quantitative Molecular-Level Understanding of Electrochemical Aluminum-Ion Intercalation into a Crystalline Battery Electrode
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DOI：
10.1021/acsenergylett.0c01138
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发表时间：
2020-09-11
影响因子：
22
通讯作者：
Messinger, Robert J.
中科院分区：
文献类型：
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作者：
Jadhav, Ankur L.;Xu, Jeffrey H.;Messinger, Robert J.
已知很少有材料电化学嵌入三价铝阳离子，这是可再充电铝离子电池电极的电荷存储机制。在这里，使用Chevrel相Mo 6S 8作为模型晶体电极材料，我们耦合电化学和固态Al-27 NMR方法，从分子水平上定量地了解铝离子嵌入机制。与二价Mg 2+阳离子不同，三价Al 3+阳离子在恒电流放电期间同时插入到Chevrel框架内的两个空腔中，而不是顺序插入。在脱嵌时发生最小的Al 3+阳离子捕获（
Few materials are known to electrochemically intercalate trivalent aluminum cations, a charge storage mechanism central to rechargeable aluminum-ion battery electrodes. Here, using the chevrel phase Mo6S8 as a model crystalline electrode material, we couple electrochemical and solid-state Al-27 NMR methods to understand quantitatively the aluminum-ion intercalation mechanism up from the molecular level. Unlike divalent Mg2+ cations, trivalent Al3+ cations intercalate simultaneously, as opposed to sequentially, into two cavities within the chevrel framework during galvanostatic discharge. Minimal Al3+ cation trapping occurs upon deintercalation (