摘要
Potassium-based dual ion batteries(KDIBs)have attracted significant attention owing to high working voltage,high safety,low processing cost,and environmental friendliness.Nevertheless,one great challenge for practical KDIBs is to develop suitable anode materials with high specific capacity.Herein,we report an architecture of hierarchically porous antimony nanoparticles/carbon nanofibers(HPSb CNFs)as flexible,free-standing anode for high-performance KDIBs.The HPSb CNFs with hierarchically porous structure,and high-content nitrogen doping,not only offer sufficient free space to tolerate the repetitive volume expansion of Sb nanoparticles during long-term cycling,but also greatly facilitate the transport of electrons and ions within electrode,ensuring high material utilization ratio.Thus,the KDIBs,constituted by HPSb CNFs-700(calcined at 700°C)anode and graphite cathode,exhibited a high reversible capacity of 440 m Ah g^(-1)with high discharge medium voltage of 4.5 V at a specific current of 200 m A g^(-1)(the highest capacity for all KDIBs normalized by the mass of the anode),and excellent cyclic life.Outstanding electrochemical reversibility of the KDIBs was further demonstrated by ex situ XRD,ex situ Raman spectrum,and HRTEM.These results suggest the as-designed HPSb CNFs-700 with highcapacity and long-term cycling stability is a promising anode material for high-performance KDIBs.
基金
financially supported by the National Natural Science Foundation of China(Grant No.21673070)
the Fundamental Research Funds of the Central Universities(No.531107051048)
Hunan Key Laboratory of Two-Dimensional Materials(No.801200005)
作者简介
Meng Zhang,Dr;Jiang Zhong,Dr;Weiqing Kong,Dr;Lei Wang,Dr;Tao Wang,Dr;Huilong Fei,Prof;Haiyan Luo,Prof;Jian Zhu,Prof.,E-mails:jzhu@hnu.edu.cn;Jiawen Hu,Prof.,E-mails:jwhu@hnu.edu.cn;Bingan Lu,Prof.
