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Carbon-Stabilized Interlayer-Expanded Few-Layer MoSe2 Nanosheets for Sodium Ion Batteries with Enhanced Rate Capability and Cycling Performance

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journal contribution
posted on 07.11.2016, 00:00 by Yongchao Tang, Zongbin Zhao, Yuwei Wang, Yanfeng Dong, Yang Liu, Xuzhen Wang, Jieshan Qiu
Sodium ion batteries (SIBs) have been considered as a promising alternative to lithium ion batteries, owing to the abundant reserve and low-cost accessibility of the sodium source. To date, the pursuit of high-performance anode materials remains a great challenge for the SIBs. In this work, carbon-stabilized interlayer-expanded few-layer MoSe2 nanosheets (MoSe2@C) have been fabricated by an oleic acid (OA) functionalized synthesis–polydopamine (PDA) stabilization–carbonization strategy, and their structural, morphological, and electrochemical properties have been carefully characterized and compared with the carbon-free MoSe2. When evaluated as anode for sodium ion half batteries, the MoSe2@C exhibits a remarkably enhanced rate capability of 367 mA h g–1 at 5 A g–1, a high reversible discharge capacity of 445 mA h g–1 at 1 A g–1, and a long-term cycling stability over 100 cycles. To further explore the potential applications, the MoSe2@C is assembled into sodium ion full batteries with Na3V2(PO4)3 (NVP) as cathode materials, showing an impressively high reversible capacity of 421 mA h g–1 at 0.2 A g–1 after 100 cycles. Such results are primarily attributed to the unique carbon-stabilized interlayer-expanded few-layer MoSe2 nanosheets structure, which facilitates the permeation of electrolyte into the inner of MoSe2 nanosheets, promoting charge transfer efficiency among MoSe2 nanosheets, and accommodating the volume change from discharge–charge cycling.