Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, People's Republic of China.
Nanoscale. 2018 Sep 20;10(36):17092-17098. doi: 10.1039/c8nr05239e.
K-ion batteries (KIBs) have become one of the promising alternatives to lithium ion batteries. In this work, we are the first to utilize reduced graphene oxide (RGO) wrapped metal organic framework-derived FeS2 hollow nanocages (FeS2@RGO) as an anode for KIBs. Owing to the synergistic effect from FeS2 nanocages and RGO shells, our FeS2@RGO sample exhibited superior electrochemical performance. Such FeS2@RGO electrodes demonstrate a high capacity of 264 mA h g-1 after 50 cycles at 50 mA g-1 and 123 mA h g-1 after 420 cycles even at a large current density of 500 mA g-1. More importantly, we also explain the electrochemical reaction process about FeS2 and believe that these results would open the door for a novel class of long cycling performance anode materials in the KIB field.
钾离子电池（KIBs）已经成为锂离子电池的一种极具前景的替代品。在这项工作中，我们首次利用还原氧化石墨烯（RGO）包裹的金属有机框架衍生的 FeS2 空心纳米笼（FeS2@RGO）作为钾离子电池的阳极。由于 FeS2 纳米笼和 RGO 壳的协同效应，我们的 FeS2@RGO 样品表现出了优异的电化学性能。这种 FeS2@RGO 电极在 50 mA g-1 的电流密度下经过 50 次循环后具有 264 mA h g-1 的高容量，在 500 mA g-1 的大电流密度下经过 420 次循环后仍具有 123 mA h g-1 的容量。更重要的是，我们还解释了关于 FeS2 的电化学反应过程，并相信这些结果将为钾离子电池领域中一类具有长循环性能的新型阳极材料开辟道路。
