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首页> 外文期刊>Advanced Functional Materials >Revealing the Double-Edged Behaviors of Heteroatom Sulfur in Carbonaceous Materials for Balancing K-Storage Capacity and Stability
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Revealing the Double-Edged Behaviors of Heteroatom Sulfur in Carbonaceous Materials for Balancing K-Storage Capacity and Stability

机译：揭示碳质材料中杂原子硫的双刃行为，用于平衡K储存能力和稳定性

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摘要

Heteroatoms in the carbon matrix are generally considered as active sites to enhance potassium storage capacity, while their adverse effects on ion batteries remain unclear. Herein, a series of sulfur doped carbon (SCDPx) with adjustable S content and crystallinity are accurately synthesized in the closed autoclave by controlling the ratios of precursors. Electrochemical measurements exhibit that heteroatom sulfur displays double-edged electrochemical activities with a high initial potassium storage capacity but poor cycling stability for carbon anode. Combined with solid-state nuclear magnetic resonance (NMR), catalytic tests, and various ex-situ characterizations, it is demonstrated that abundant S in the carbon would not only form C-S-C bonds, acting as active sites to reversibly adsorb/desorb potassium ions for high capacity, but also significantly catalyze the reduction and decomposition of the electrolyte including KPF6 and ethylene carbonate/diethyl carbonate (EC/DEC) to form thicker solid electrolyte interface (SEI) and degrade electrolyte, resulting in rapid capacity decay. As a result, the optimized sample (SCDP2) with the appropriate sulfur doping content exhibits the best electrochemical performance with high capacity (688.4 mA h g(-1) at 100 mA g(-1)), long-term cycling stability (198.4 mA h g(-1) at 2000 mA g(-1) after 10 000 cycles), and excellent rate capability (238.8 mA h g(-1) at 5000 mA g(-1)).
机译：碳基质中的杂原子通常被认为是活性位点，以提高储存能力，而它们对离子电池的不利影响仍不清楚。这里，通过控制前体的比例，在封闭的高压釜中精确地合成一系列具有可调节的S含量和结晶度的硫掺杂碳（SCDPX）。电化学测量表明，杂原子硫显示出具有高初始钾储存能力的双刃电化学活性，但碳阳极循环稳定性差。结合固态核磁共振（NMR），催化试验和各种前原位特征，证明碳中的丰富S不仅形成CSC键，可作为有源位点，以可逆地吸附/解吸钾离子高容量，但也显着催化电解质的电解质的减少和分解，包括KPF6和碳酸亚乙酯/碳酸亚乙酯（EC / DEC）形成较厚的固体电解质界面（SEI）并降解电解质，导致快速容量衰减。结果，具有适当的硫掺杂含量的优化样品（SCDP2）具有高容量（688.4 mA Hg（-1）的最佳电化学性能（在100mA g（-1）），长期循环稳定性（198.4 mA HG（-1）在1000次循环后的2000 mA g（-1）），优异的速率能力（238.8 mA Hg（-1），5000 mA g（-1））。

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  • 来源
    《Advanced Functional Materials》 |2021年第8期|2006875.1-2006875.10|共10页
  • 作者

    Qian Yong; Li Yang; Yi Zheng; Zhou Jie; Pan Zhen; Tian Jie; Wang Yusong; Sun Shanshan; Lin Ning; Qian Yitai;

  • 作者单位

    Univ Sci & Technol China Dept Appl Chem Hefei Natl Lab Phys Sci Microscale Hefei 230026 Peoples R China;

    Univ Sci & Technol China Dept Appl Chem Hefei Natl Lab Phys Sci Microscale Hefei 230026 Peoples R China;

    Univ Sci & Technol China Dept Appl Chem Hefei Natl Lab Phys Sci Microscale Hefei 230026 Peoples R China;

    Univ Sci & Technol China Dept Appl Chem Hefei Natl Lab Phys Sci Microscale Hefei 230026 Peoples R China;

    Univ Sci & Technol China Dept Appl Chem Hefei Natl Lab Phys Sci Microscale Hefei 230026 Peoples R China;

    Univ Sci & Technol China Expt Ctr Engn & Mat Sci Hefei 230026 Peoples R China;

    Univ Sci & Technol China Dept Appl Chem Hefei Natl Lab Phys Sci Microscale Hefei 230026 Peoples R China;

    Ningo Veken New Energy Technol Co Ltd Ningbo 315800 Zhejiang Peoples R China;

    Univ Sci & Technol China Dept Appl Chem Hefei Natl Lab Phys Sci Microscale Hefei 230026 Peoples R China;

    Univ Sci & Technol China Dept Appl Chem Hefei Natl Lab Phys Sci Microscale Hefei 230026 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    active sites; carbonaceous materials; catalytic effects; double#8208; edged behaviors; heteroatom sulfur doping;

    机译：活跃点;碳质材料;催化作用;双重＆＃8208;边缘行为;杂种硫磺掺杂;

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