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3D Interconnected MoS2 with Enlarged Interlayer Spacing Grown on Carbon Nanofibers as a Flexible Anode Toward Superior Sodium-Ion Batteries

Li, Wei, Bi, Ran, Liu, Guoxue, Tian, Yaxi, Zhang, Lei
ACS applied materials & interfaces 2018 v.10 no.32 pp. 26982-26989
anodes, batteries, carbon nanofibers, chemical bonding, durability, electronics, energy, hot water treatment, molybdenum disulfide
Molybdenum disulfide (MoS₂) has attracted extensive research interest as a fascinating anode for sodium-ion batteries (SIBs) because of its high specific capacity of 670 mA h g–¹. However, unsatisfied cycling durability and poor rate performance are two barriers that hinder MoS₂ for practical application in SIBs. Herein, 3D interconnected MoS₂ with enlarged interlayer spacing epitaxially grown on 1D electrospinning carbon nanofibers (denoted as MoS₂@CNFs) was prepared as a flexible anode for SIBs via l-cysteine-assisted hydrothermal method. Benefitting from the C–O–Mo bonding between the CNFs and MoS₂ as well as the rational design with novel structure, including the well-retained 3D interconnected and conductive MoS₂@CNFs networks and expanded (002) plane interlayer space, the flexible MoS₂@CNFs electrode achieves a remarkable specific capacity (528 mA h g–¹ at 100 mA g–¹), superior rate performance (412 mA h g–¹ at 1 A g–¹), and ultralong cycle life (over 600 cycles at 1 A g–¹ with excellent Coulombic efficiencies exceeding 99%). The elaborate strategy developed in this work opens a new avenue to prepare highly improved energy storage materials, especially suitable for flexible electronics.