Key Words:PERFORMANCE ANODE MATERIAL; NA-ION BATTERIES; FESE2 MICROSPHERES; ENERGY-STORAGE; CARBON; NANOOCTAHEDRA; NANOPARTICLES; NANOCRYSTALS; CYCLABILITY; CAPABILITY 作者信息
Abstract:Ordered hierarchical architectures are attractive candidates for electrochemical energy storage applications. Herein, a facile self-template strategy is applied to prepare Fe_7Se_8 architectures with a monolithic structure via a self-synthesized single precursor and subsequent calcination at high temperature. With the support of oleylamine, the precursor is structurally targeted to engineer the Fe_7Se_8 microstructure,featuring nanorod bundles arranged along the longitudinal direction. Because of their ordered hierarchical structure, the Fe_7Se_8 nanorod bundles deliver a high reversible capacity of 300 m Ah g~(-1) at 0.5 A g~(-1),along with exceptional rate capability up to 20 A g~(-1) and long-term cycle life over 8000 cycles, which represents the highest stability of Fe_7Se_8 anodes for sodium-ion batteries reported to date. The feasibility of the present strategy to prepare metal selenide structures highlights its promising potential for the rational and effective engineering of electrode materials responsible for the electrochemical performance of energy storage systems.
Volume:v.44
Issue:05
Translation or Not:no