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Increasing Accessible Subsurface to Improving Rate Capability and Cycling Stability of Sodium-lon Batteries

机译：增加可访问的地下，以提高钠电池的速率能力和循环稳定性

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摘要

Numerous studies have reported that the enhancement of rate capability of carbonaceous anode by heteroatom doping is due to the increased diffusion-controlled capacity induced by expanding interlayer spacing. However, percentage of diffusion-controlled capacity is less than 30% as scan rate is larger than 1 mV s(-1), suggesting there is inaccuracy in recognizing principle of improving rate capability of carbonaceous anode. In this paper, it is found that the heteroatom doping has little impact on interlayer spacing of carbon in bulk phase, meaning that diffusion-controlled capacity is hard to be enhanced by doping. After synergizing with tensile stress, however, the interlayer spacing in subsurface region is obviously expanded to 0.40 nm, which will increase the thickness of accessible subsurface region at high current density. So SRNDC-700 electrodes display a high specific capacity of 160.6 and 69.5 mAh g(-1) at 20 and 50 A g(-1), respectively. Additionally, the high reversibility of carbon structure insures ultralong cycling stability and hence attenuation of SRNDC-700 is only 0.0025% per cycle even at 10 A g(-1) for 6000 cycles. This report sheds new insight into mechanism of improving electrochemical performance of carbonaceous anode by doping and provides a novel design concept for doping carbon.
机译：许多研究报道说，通过杂原子掺杂的碳质阳极的速率能力提高是由于通过膨胀层间距引起的扩散控制能力增加。然而，随着扫描速率大于1 mV S（-1），漫射控制容量的百分比小于30％，表明含碳阳极速率能力的原理存在不准确。在本文中，发现杂原子掺杂对体相中碳中的层间间距几乎没有影响，这意味着通过掺杂难以增强扩散控制的容量。然而，在用拉伸应力进行协同后，地下区域中的层间间隔明显扩增至0.40nm，这将以高电流密度提高可接近的地下区域的厚度。因此，SRNDC-700电极分别在20和50Ag（-1）下显示出160.6和69.5mAhg（-1）的高比容量。另外，碳结构的高可逆性确保超速循环稳定性，因此，即使在10Ag（-1）上，SrNDC-700的衰减也仅为每周期为0.0025％，甚至在10Ag（-1）上以6000个循环。本报告通过掺杂来提高碳质阳极电化学性能的机制，为掺杂碳的新颖设计理念提供了新的洞察力。

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  • 来源
    《Advanced Materials》 |2021年第37期|2100808.1-2100808.11|共11页
  • 作者

    Yin Bo; Liang Shuquan; Yu Dongdong; Cheng Boshi; Egun Ishioma L.; Lin Jiande; Xie Xuefang; Shao Hezhu; He Haiyong; Pan Anqiang;

  • 作者单位

    Cent South Univ Sch Mat Sci & Engn Changsha 410083 Peoples R China|Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

    Cent South Univ Sch Mat Sci & Engn Changsha 410083 Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

    Cent South Univ Sch Mat Sci & Engn Changsha 410083 Peoples R China;

    Cent South Univ Sch Mat Sci & Engn Changsha 410083 Peoples R China;

    Wenzhou Univ Coll Elect Elect Engn Wenzhou Key Lab Micronano Optoelect Devices Wenzhou 325035 Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

    Cent South Univ Sch Mat Sci & Engn Changsha 410083 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    3D porous carbon frameworks; doping carbon; pseudocapacitive capacity; rate capability; sodium-ion batteries; subsurface;

    机译：3D多孔碳框架;掺杂碳;假电容能力;速率能力;钠离子电池;地下;

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