3D hierarchical architectures of CoSe<sub>2</sub> nanoparticles embedded in rice‐derived hard carbon for advanced sodium storage
Congjian Lin, Jintao Zhang, Yew Von Lim, Dongliang Yan, Ke Li, Zhi Yi Leong, Sareh Vafakhah, Yifan Li, Arlindo Silva, Hui Ying Yang
Abstract
Abstract A low‐cost and feasible method to fabricate three‐dimensional (3D) hierarchical composites composed of CoSe 2 nanoparticles embedded in rice‐derived hard carbon (HC) interconnected with carbon nanotubes (CNTs) is devised in this study. The deployment of CoSe 2 in the elecrode has provided a very high rate capacity, which is crucial for sodium‐ion commercialization. The deployment of HC with CNTs further provides a 3D hierarchical structure effective in shortening the diffusion paths of both electrons and Na + ions, offering abundance of active sodium storage sites. Consequently, the CoSe 2 acted as an active material with the carbonaceous template, a commonly utilized sodium‐ion battery anode material, which exhibited a superior reversible capacity of 550 mAh g −1 at 0.5 A g −1 , outstanding rate performance (451 mAh g −1 at 20 A g −1 ) and excellent cycling performance (~100% capacity retention over 2500 cycles at 20 A g −1 after electrochemical stabilization).