Potassium-Ion Oxygen Battery Based on a High Capacity Antimony Anode
Potassium-Ion Oxygen Battery Based on a High Capacity Antimony Anode
复制标题
DOI：
10.1021/acsami.5b08037
复制
发表时间：
2015-12-02
影响因子：
9.5
通讯作者：
Wu, Yiying
中科院分区：
文献类型：
--
作者：
McCulloch, William D.;Ren, Xiaodi;Wu, Yiying
最近对钾在氧钾、硫钾和钾离子电池中的应用的研究代表了一种超越当前锂离子技术的新方法。在此，我们报道了一种用于钾氧和钾离子电池的高容量阳极材料。锑基电极显示出650 mAh/g的可逆存储容量（理论容量的98%，660 mAh/g），对应于立方K3Sb合金的形成。Sb电极可以在250 mAh/g的容量下循环超过50次，这是报道的钾离子阳极材料的最高容量之一。利用x射线衍射和恒流技术分别研究了合金的组织和循环性能。利用循环伏安法和电化学阻抗谱对K-Sb合金化反应的热力学和动力学进行了深入研究。最后，我们探索了该负极材料在K3Sb-O-2电池中的应用，该电池具有较高的工作电压、较低的过电位、更高的安全性和界面稳定性，有效地展示了其在金属氧电池领域的适用性。
Recent investigations into the application of potassium in the form of potassium oxygen, potassium sulfur, and potassium-ion batteries represent a new approach to moving beyond current lithium-ion technology. Herein, we report on a high capacity anode material for use in potassium oxygen and potassium-ion batteries. An antimony-based electrode exhibits a reversible storage capacity of 650 mAh/g (98% of theoretical capacity, 660 mAh/g) corresponding to the formation of a cubic K3Sb alloy. The Sb electrode can cycle for over 50 cycles at a capacity of 250 mAh/g, which is one of the highest reported capacities for a potassium-ion anode material. X-ray diffraction and galvanostatic techniques were used to study the alloy structure and cycling performance, respectively. Cyclic voltammetry and electrochemical impedance spectroscopy were used to provide insight into the thermodynamics and kinetics of the K-Sb alloying reaction. Finally, we explore the application of this anode material in the form of a K3Sb-O-2 cell which displays relatively high operating voltages, low overpotentials, increased safety, and interfacial stability, effectively demonstrating its applicability to the field of metal oxygen batteries.