Metal–Organic Framework/Polythiophene Derivative: Neuronlike S‑Doped Carbon 3D Structure with Outstanding Sodium Storage Performance

• Published in: ACS applied materials & interfaces 2019-10, Vol.11 (41), p.37850-37858
• Main Authors: Zhong, Wen, Lv, Xingshuai, Chen, Qianwu, Ren, Manman, Liu, Weiliang, Li, Guangda, Yu, Jiaoxian, Li, Mei, Dai, Ying, Wang, Lianzhou
• Format: Article
• Language: English
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.9b14366

Herein, a metal–organic framework (MOF)/polythiophene (PTh)-derived S-doped carbon is successfully designed and prepared employing zeolitic imidazolate frameworks (ZIF-8/ZIF-67) and thiophene (Th) as precursors. The S-doped carbon presents a neuronlike three-dimensional network structure (3DSC). The 3DSC delivers extra-high capacities (225 mAh/g at 5000 mA/g after 3000 cycles) and excellent endurance ability of current changes when applied in Na-ion batteries (SIBs). Moreover, when the 3DSC-700 anode is coupled with a sodium vanadium phosphate cathode to construct a Na-ion full cell, after 50 cycles, a high capacity of ∼229.64 mAh/g is obtained at 100 mA/g. Electrochemical impedance spectroscopy analysis, density functional theory calculations, and pseudocapacitance contributions are adopted to investigate the excellent sodium storage mechanism of the 3DSC electrode. A new idea has been provided in this work to open up the possibility of MOF materials and carbon-based materials applications in SIBs in the future.