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Porous CoFe2O4 nanocubes derived from metal-organic frameworks as high-performance anode for sodium ion batteries
Xiaojie Zhang1, Dongsheng Li2, Guang Zhu3
1Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China; Anhui Key Laboratory of Spin Electron and Nanomaterials, Suzhou University, Suzhou, Anhui 234000, China.
Abstract:
Recently sodium ion batteries (SIBs) as a new energy storage system have attracted enormous interests. Unfortunately, the development of high-performance electrode materials for SIBs is restricted owing to the large volume change during sodium insertion and extraction. In this work, porous CoFe2O4 nanocubes (PCFO-NCs) were prepared simply by annealing metal-organic frameworks and used as anode materials for SIBs. The PCFO-NCs exhibit a high initial Coulombic efficiency of 68.8% and a maximum reversible capacity of 360mAhg-1 after 50 cycles at the current density of 50mAg-1, as well as good rate capability and excellent cycling stability at high current density. The excellent electrochemical performance can be attributed the short diffusion distance of sodium ion due to the good interfacial contact between electrode and electrolyte, and the buffering of volume change during charge/discharge processes by the porous structure.