Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China; Anhui Key Laboratory of Spin Electron and Nanomaterials, Suzhou University, Suzhou, Anhui 234000, China.
Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China.
J Colloid Interface Sci. 2017 Aug 1;499:145-150. doi: 10.1016/j.jcis.2017.03.104. Epub 2017 Mar 27.
Recently sodium ion batteries (SIBs) as a new energy storage system have attracted enormous interests. Unfortunately, the development of high-performance electrode materials for SIBs is restricted owing to the large volume change during sodium insertion and extraction. In this work, porous CoFeO nanocubes (PCFO-NCs) were prepared simply by annealing metal-organic frameworks and used as anode materials for SIBs. The PCFO-NCs exhibit a high initial Coulombic efficiency of 68.8% and a maximum reversible capacity of 360mAhg after 50 cycles at the current density of 50mAg, as well as good rate capability and excellent cycling stability at high current density. The excellent electrochemical performance can be attributed the short diffusion distance of sodium ion due to the good interfacial contact between electrode and electrolyte, and the buffering of volume change during charge/discharge processes by the porous structure.
最近，钠离子电池（SIBs）作为一种新型储能系统引起了极大的关注。不幸的是，由于钠离子插入和提取过程中的体积变化较大，高性能电极材料的发展受到限制。在这项工作中，我们通过简单地退火金属有机骨架制备了多孔 CoFeO 纳米立方（PCFO-NCs），并将其用作 SIBs 的阳极材料。PCFO-NCs 在 50mA/g 的电流密度下经过 50 次循环后，具有 68.8%的高初始库仑效率和 360mAh/g 的最大可逆容量，以及在高电流密度下良好的倍率性能和优异的循环稳定性。优异的电化学性能可归因于电极与电解质之间良好的界面接触，使得钠离子的扩散距离较短，以及多孔结构在充放电过程中对体积变化的缓冲。
