Journal Article

Metal-organic framework-derived porous shuttle-like vanadium oxides for sodium-ion battery application

Yangsheng Cai;Guozhao Fang;Jiang Zhou;Sainan Liu;Zhigao Luo;Anqiang Pan;Guozhong Cao;I Shuquan Liang

2018

Overview

Vanadium oxides with a layered structure are promising candidates for both lithium-ion batteries and sodium-ion batteries （SIBs）. The self-template approach, which involves a transformation from metal-organic frameworks （MOFs） into porous metal oxides, is a novel and effective way to achieve desirable electrochemical performance. In this stud~ porous shuttle-like vanadium oxides （i.e., V205, V203/C） were successfully prepared by using MIL-88B （V） as precursors with a specific calcination process. As a proof-of-concept application, the as- prepared porous shuttle-like VaOdC was used as an anode material for SIBs. The porous shuttle-like V203/C, which had an inherent layered structure with metallic behavior, exhibited excellent electrochemical properties. Remarkable rate capacities of 417, 247, 202, 176, 164, and 149 mAh.g-1 were achieved at current densities of 50, 100, 200, 500, 1,000, and 2,000 mA.g-1, respectively. Under cycling at 2 A.g-1, the specific discharge capacity reached 181 mAh.g-1, with a low capacity fading rate of 0.032% per cycle after 1,000 cycles. Density functional theory calculation results indicated that Na ions preferred to occupy the interlamination rather than the inside of each layer in the V203. Interestingly, the special layered structure with a skeleton of dumbbell-like V-V bonds and metallic behavior was maintained after the insertion of Na ions, which was beneficial for the cycle performance. We consider that the MOF precursor of MIL-88B （V） can be used to synthesize other porous V-based materials for various applications.

• Publisher: Tsinghua University Press
• Subject: Anodes / Atomic/Molecular Structure and Spectra / Batteries / Biomedicine / Biotechnology / Chemical bonds / Chemistry and Materials Science / Condensed Matter Physics / Density functional theory / Electrochemical analysis / Electrochemistry / Electrode materials / Ions / Lithium / Lithium-ion batteries / Materials Science / Metal-organic frameworks / Nanotechnology / Oxides / Porous materials / Rechargeable batteries / Research Article / Sodium / Sodium-ion batteries / Vanadium / Vanadium oxides / Vanadium pentoxide / 钠离子电池;金属氧化物;钒氧化物;多孔;框架;器官;电气化学;阳极材料