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Highly Reversible O2 Conversions by Coupling LiO2 Intermediate through a Dual‐Site Catalyst in Li‐O2 Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-08-14 , DOI: 10.1002/aenm.202001592 Xiaodong Lin 1 , Zongqiang Sun 1 , Chun Tang 1 , Yuhao Hong 1 , Pan Xu 1 , Xueyang Cui 1 , Ruming Yuan 1 , Zhiyou Zhou 1 , Mingsen Zheng 1 , Quanfeng Dong 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-08-14 , DOI: 10.1002/aenm.202001592 Xiaodong Lin 1 , Zongqiang Sun 1 , Chun Tang 1 , Yuhao Hong 1 , Pan Xu 1 , Xueyang Cui 1 , Ruming Yuan 1 , Zhiyou Zhou 1 , Mingsen Zheng 1 , Quanfeng Dong 1
Affiliation
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The reduction of O2 to solid Li2O2 on discharge and the reverse oxidation of Li2O2 to O2 on recharge are the essential processes to determine the performance of Li‐O2 batteries. The discovery of effective catalysts with a favorable Li2O2 formation/decomposition mechanism is vital for the development of high‐performance Li‐O2 batteries. Here, a soluble catalyst of iodosylbenzene (PhIO) that can offer a highly reversible O2 conversion is reported for the first time. Benefiting from its ability to capture and couple the LiO2 intermediate, which is endowed by its polarized I3+O2− bond where the I atom and O atom can serve as a Lewis acidic site and basic site (dual site) to interact with O2− and Li+, respectively, the formation and decomposition of Li2O2 by a one‐electron pathway can be effectively promoted, thus greatly improving the electrode surface passivation issue and the reaction kinetics. In addition, the side reactions caused by the traditional high‐reactive LiO2 intermediate can also be effectively suppressed by forming a series of low‐reactive intermediates (LiO23PhIO, (LiO2)24PhIO, and Li2O24PhIO) instead. Consequently, the PhIO‐catalyzed Li–O2 batteries exhibit a low overpotential, a large capacity, and a good cyclability.
中文翻译：
通过使用Li-O2电池中的双站点催化剂耦合LiO2中间物来实现高度可逆的O2转化
放电时O 2还原为固态Li 2 O 2以及充电时Li 2 O 2还原为O 2是确定Li-O 2电池性能的重要过程。具有良好的Li 2 O 2形成/分解机理的有效催化剂的发现对于高性能Li-O 2电池的开发至关重要。在此，首次报道了可提供高度可逆的O 2转化的碘代苯（PhIO）可溶性催化剂。受益于其捕获和耦合LiO 2的能力中间体，其通过它的偏振光赋予我3+ O 2-键的I原子和其中O原子可以作为路易斯酸性部位和碱性位点（双位点）到带O相互作用2 -和Li +，分别为可以有效地促进单电子途径的Li 2 O 2的形成和分解，从而大大改善了电极表面的钝化问题和反应动力学。此外，由传统的高反应性LIO副反应2中间也可以通过形成一系列低反应性中间体的被有效地抑制（LIO 2 3PhIO，（LIO 2）2 4PhIO，李2 Ø 2 4PhIO）来代替。因此，PhIO催化的Li-O 2电池具有较低的过电位，大容量和良好的可循环性。
更新日期：2020-10-13
中文翻译：
通过使用Li-O2电池中的双站点催化剂耦合LiO2中间物来实现高度可逆的O2转化
放电时O 2还原为固态Li 2 O 2以及充电时Li 2 O 2还原为O 2是确定Li-O 2电池性能的重要过程。具有良好的Li 2 O 2形成/分解机理的有效催化剂的发现对于高性能Li-O 2电池的开发至关重要。在此，首次报道了可提供高度可逆的O 2转化的碘代苯（PhIO）可溶性催化剂。受益于其捕获和耦合LiO 2的能力中间体，其通过它的偏振光赋予我3+ O 2-键的I原子和其中O原子可以作为路易斯酸性部位和碱性位点（双位点）到带O相互作用2 -和Li +，分别为可以有效地促进单电子途径的Li 2 O 2的形成和分解，从而大大改善了电极表面的钝化问题和反应动力学。此外，由传统的高反应性LIO副反应2中间也可以通过形成一系列低反应性中间体的被有效地抑制（LIO 2 3PhIO，（LIO 2）2 4PhIO，李2 Ø 2 4PhIO）来代替。因此，PhIO催化的Li-O 2电池具有较低的过电位，大容量和良好的可循环性。
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