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

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• 作者：Yongchao Tang ; Zongbin Zhao ; Yuwei Wang ; Yanfeng Dong ; Yang Liu ; Xuzhen Wang ; Jieshan Qiu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：November 30, 2016
• 年：2016
• 卷：8
• 期：47
• 页码：32324-32332
• 全文大小：584K
• ISSN：1944-8252

文摘

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.