Sacrificial template synthesis of hollow C@MoS2@PPy nanocomposites as anodes for enhanced sodium storage performance

Molybdenum disulfide (MoS2) has become a potential anode material for sodium-ion batteries (SIBs) by showing decent cell performance but it suffers poor electronic conductivity and large volume expansion during sodiation. Here we design a nanocomposite with hollow nitrogen doped carbon and polypyrro...

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Veröffentlicht in:Nano energy 2019-06, Vol.60 (C), p.362-370
Hauptverfasser: Wang, Guangming, Bi, Xuanxuan, Yue, Hailong, Jin, Rencheng, Wang, Qingyao, Gao, Shanmin, Lu, Jun
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Sprache:eng
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Zusammenfassung:Molybdenum disulfide (MoS2) has become a potential anode material for sodium-ion batteries (SIBs) by showing decent cell performance but it suffers poor electronic conductivity and large volume expansion during sodiation. Here we design a nanocomposite with hollow nitrogen doped carbon and polypyrrole modified MoS2 for improving the performance for SIBs. The designed nanocomposite shows a much-improved electronic conductivity and the design of the architecture provides sufficient channels for mass transport and accommodates large volume change. This C@MoS2@PPy anode delivers a high specific capacity of 713 mAh g−1 at 0.1 A g−1 for 100 cycles, and an excellent rate capacity of 294 mAh g−1 at 5 A g−1 for 500 cycles. This specific architecture of C@MoS2@PPy could guide the future design of the electrode material in SIBs and its superior electrochemical performance indicates the great potential application for SIBs. Hollow C@MoS2@PPy nanocomposites were designed and fabricated using FeOOH@C as sacrificial template, which exhibit excellent cycle stability and good rate capacity. [Display omitted] •Ultrathin MoS2 nanosheets confined in N-doped carbon and PPy are prepared and used as high performance electrode for SIBs.•C@MoS2@PPy with much stronger MoN bonds can effectively enhance the mechanical stability.•The N-doped carbon nanotubes and PPy provide binary channels for accelerating the Na-ion transport.•C@MoS2@PPy delivers a specific capacity of 294 mAh g−1 after 500 cycles at 5 A g−1.
ISSN:2211-2855
DOI:10.1016/j.nanoen.2019.03.065