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A flexible core-shell carbon layer MnO nanofiber thin film via host-guest interaction: Construction, characterization, and electrochemical performances

Wang, Fan, Li, Chao, Zhong, Jing, Yang, Zhenyu
Carbon 2018 v.128 pp. 277-286
anodes, beta-cyclodextrin, carbon, carbon nanofibers, composite materials, electrochemistry, electron transfer, films (materials), lithium, lithium batteries, manganese, particle size, polyacrylonitrile
Supermolecular complexation with cyclodextrins by non-covalent host-guest interaction is used for various applications. In this work, we fabricated the freestanding and flexible core-shell MnO/carbon nanofiber (CNF) composite thin films by host-guest interaction and high-voltage electrospining technique. The as-prepared composite thin film with dual carbon layer nanofibers showed smaller MnO particle size, lower electron-transfer resistance, and faster lithium ion migration, which were attributed to intermolecular non-covalent assembling behavior among polyacrylonitrile (PAN), β-cyclodextrin (β-CD) and Mn ion. As expected, the composite film as anode in Li-ion battery showed impressive performance: a high reversible capacity (∼1025 mAh g⁻¹ at ∼0.1 A g⁻¹), excellent rate capability (∼376 mAh g⁻¹ at ∼5 A g⁻¹), and superior cyclability (∼844 mAh g⁻¹ at the current density of ∼1 A g⁻¹ after 800 cycles). Such outstanding electrochemical performance endows the MCNFs composites with great potential as anode material for LIBs.