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首页> 外文期刊>Advanced energy materials >Nitrogen-Doping-Induced Defects of a Carbon Coating Layer Facilitate Na-Storage in Electrode Materials
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Nitrogen-Doping-Induced Defects of a Carbon Coating Layer Facilitate Na-Storage in Electrode Materials

机译：碳涂层的氮掺杂引起的缺陷促进了电极材料中的钠存储

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摘要

A nitrogen-doped, carbon-coated Na3V2(PO4)3 cathode material is synthesized and the formation of doping type of nitrogen-doped in carbon coating layer is systemically investigated. Three different carbon-nitrogen species: pyridinic N, pyrrolic N, and quaternary N are identified. The most important finding is that different carbon-nitrogen species in the carbon layer have different impacts on the improvement of the electrochemical properties of Na3V2(PO4)3. Pyridinic N and pyrrolic N significantly increase the electronic conductivity and create numerous extrinsic defects and active sites. Quaternary N only increases the electronic conductivity without creating extrinsic defects. Therefore, it is unexpectedly demonstrated that the Na3V2(PO4)3/C+N, in which with minimize content of quaternary N or exist most extrinsic defects, exhibits the best electrochemical performance, particularly the rate performance and cycling stability. For example, when the discharging rate increased from 0.2 C to 5 C, its capacity of 101.9 mAh g−1 decays to 84.3 mAh g−1 and an amazing capacity retention of 83% is achieved. Moreover, even at higher current density of 5 C, an excellent capacity retention of 93% is maintained even after 100 cycles.
机译：合成了氮掺杂碳包覆的Na 3 V 2（PO 4）3阴极材料，系统地研究了碳包覆层中氮掺杂掺杂类型的形成。确定了三种不同的碳氮物质：吡啶二氮，吡咯氮和季氮。最重要的发现是碳层中不同的碳氮物质对Na3V2（PO4）3电化学性能的改善有不同的影响。吡啶氮和吡咯N显着提高了电子电导率并产生了许多外在缺陷和活性位点。季氮仅增加电导率而不会产生外在缺陷。因此，出乎意料地证明，其中季铵态氮含量最小或存在大多数非本征缺陷的Na3V2（PO4）3 / C + N表现出最佳的电化学性能，特别是速率性能和循环稳定性。例如，当放电速率从0.2 C增加到5 C时，其101.9 mAh g-1的容量会下降到84.3 mAh g-1，并获得惊人的83％的容量保持率。此外，即使在5 C的较高电流密度下，即使经过100次循环，仍可保持93％的出色容量保持率。

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  • 来源
    《Advanced energy materials》 |2015年第1期|1-11|共11页
  • 作者

    Wei Shen; Cong Wang; Qunjie Xu; Haimei Liu; Yonggang Wang;

  • 作者单位

    College of Environmental and Chemical Engineering Shanghai University of Electric Power Shanghai China;

    State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing China;

    College of Environmental and Chemical Engineering Shanghai University of Electric Power Shanghai China;

    State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing China;

    College of Environmental and Chemical Engineering Shanghai University of Electric Power Shanghai China;

    College of Environmental and Chemical Engineering Shanghai University of Electric Power Shanghai China;

    State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing China;

    Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New Energy Fudan University Shanghai China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    carbon coatings; nitrogen doping; defects; sodium-ion batteries; cathode materials;

    机译：碳涂层;氮掺杂;缺陷;钠离子电池;阴极材料;

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