Solvent-Exchange Strategy toward Aqueous Dispersible MoS Nanosheets and Their Nitrogen-Rich Carbon Sphere Nanocomposites for Efficient Lithium/Sodium Ion Storage.

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ID: 47427
2019
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Abstract
Major challenges in developing 2D transition-metal disulfides (TMDs) as anode materials for lithium/sodium ion batteries (LIBs/SIBs) lie in rational design and targeted synthesis of TMD-based nanocomposite structures with precisely controlled ion and electron transport. Herein, a general and scalable solvent-exchange strategy is presented for uniform dispersion of few-layer MoS (f-MoS ) from high-boiling-point solvents (N-methyl-2-pyrrolidone (NMP), N,N-dimethyl formaldehyde (DMF), etc.) into low-boiling-point solvents (water, ethanol, etc.). The solvent-exchange strategy dramatically simplifies high-yield production of dispersible MoS nanosheets as well as facilitates subsequent decoration of MoS for various applications. As a demonstration, MoS -decorated nitrogen-rich carbon spheres (MoS -NCS) are prepared via in situ growth of polypyrrole and subsequent pyrolysis. Benefiting from its ultrathin feature, largely exposed active surface, highly conductive framework and excellent structural integrity, the 2D core-shell architecture of MoS -NCS exhibits an outstanding reversible capacity and excellent cycling performance, achieving high initial discharge capacity of 1087.5 and 508.6 mA h g at 0.1 A g , capacity retentions of 95.6% and 94.2% after 500 and 250 charge/discharge cycles at 1 A g , for lithium/sodium ion storages, respectively.
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wang2019solventexchangesmall Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Yufeng Wang, Kai Wang, Chao Zhang, Jixin Zhu, Jingsan Xu, Tianxi Liu
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Journal Small (Weinheim an der Bergstrasse, Germany)
Year 2019
DOI
10.1002/smll.201903816
URL
Keywords
molybdenum disulfide liquid-phase exfoliation lithium/sodium ion batteries nitrogen-rich carbon solvent-exchange strategies

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