Epitaxial growth induced multilayer yolk-shell structured CoSe2 with promoting transport kinetics of sodium ion half/full batteries

• Published in: Journal of power sources 2022-01, Vol.517, p.230729, Article 230729
• Main Authors: Liang, Huajian, Li, Xiaotong, Liu, Xinlong, Sun, Rui, Qin, Zhaoxia, Zhang, Yufei, Fan, Haosen
• Format: Article
• Language: English
• Subjects: Cycling stability; Epitaxial growth; Multilayer yolk-shell CoSe2; Na+ half/full battery; Transport kinetics
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2021.230729

Metal-organic framework (MOF)-derived yolk-shell structures are one of the most potential nanoarchitectures applied in second batteries and electrocatalysis. In this manuscript, a multilayer yolk-shell structured CoSe2 has been fabricated via post carbonization and selenization processes of step-by-step crystal epitaxial growth of multilayer solid zeolitic imidazolate frameworks (ZIFs) precursor. When used as the anode of a sodium-ion half battery, the obtained multilayer yolk-shell structured CoSe2 materials can maintain a discharge capacity of 352.9 mAh g−1 after the 2000 cycles at the current density of 1 A g−1, which can be attributed to the special multilayer yolk-shell structure by providing the fast sodium ion transport. Besides, it also delivers excellent electrochemical performance in the sodium-ion full batteries, which further demonstrate the outstanding electrochemical property of the obtained multilayer yolk-shell structured CoSe2 electrode material. •The multilayered yolk-shell CoSe2 nano-dodecahedrons was successfully prepared.•The multilayered CoSe2 with hollow structure effectively buffer volume expansion.•The multilayered yolk-shell CoSe2 shows excellent long-term cycle stability in SIB.•The Na-ion full cell exhibits excellent rate capacity and cycle performance.