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首页> 外文期刊>Advanced Functional Materials >On the Cycling Performance of Na-O_2 Cells: Revealing the Impact of the Superoxide Crossover toward the Metallic Na Electrode
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On the Cycling Performance of Na-O_2 Cells: Revealing the Impact of the Superoxide Crossover toward the Metallic Na Electrode

机译：Na-O_2细胞的循环性能：揭示超氧化物交换对金属Na电极的影响

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摘要

Na-O-2 batteries have attracted extensive attention as promising candidates for large-scale energy storage due to their ultrahigh theoretical energy density. However, the poor cycling performance of Na-O-2 batteries is one of the major challenges facing its future development. A novel Na-O-2 battery using electrically connected carbon paper with Na metal as a protected anode is presented in this study. The O-2(-) crossover from the cathode to anode partially contributes to the limited Coulombic efficiency, as well as the Na corrosion during the cycling process. For the cells with protected Na, the carbon paper maintains a pseudo-equal potential with the Na metal and works as an artificial protective layer to suppress the detrimental side reactions caused by O-2(-) and O-2 crossover toward the Na electrode. Furthermore, the short-circuiting issue caused by Na dendrite growth also can be completely resolved. Consequently, the Na-O-2 cells with protected Na exhibit two times higher discharge capacity and cycling stability compared with the cells using bare Na. These results indicate the crucial role of the Na anode in determining the overall cell performance and a rational design of anode can dramatically contribute to develop advanced Na-O-2 batteries with longer lifespans and better cycling performance.
机译：Na-O-2电池由于其超高的理论能量密度，已成为大规模储能的有希望的候选者，引起了广泛的关注。但是，Na-O-2电池循环性能差是其未来发展面临的主要挑战之一。这项研究提出了一种新颖的Na-O-2电池，该电池使用电连接的碳纸和Na金属作为受保护的阳极。从阴极到阳极的O-2（-）交叉部分地导致了有限的库仑效率，以及循环过程中的Na腐蚀。对于具有受保护的Na的电池，碳纸保持与Na金属的假等电位，并用作人工保护层，以抑制O-2（-）和O-2越过Na电极交叉所引起的有害副反应。 。此外，由钠枝晶生长引起的短路问题也可以完全解决。因此，与使用裸Na的电池相比，具有受保护的Na的Na-O-2电池表现出两倍的放电容量和循环稳定性。这些结果表明，Na阳极在决定整体电池性能方面起着至关重要的作用，阳极的合理设计可以极大地帮助开发具有更长使用寿命和更好循环性能的高级Na-O-2电池。

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  • 来源
    《Advanced Functional Materials》 |2018年第35期|1801904.1-1801904.12|共12页
  • 作者

    Lin Xiaoting; Sun Qian; Yadegari Hossein; Yang Xiaofei; Zhao Yang; Wang Changhong; Liang Jianneng; Koo Alicia; Li Ruying; Sun Xueliang;

  • 作者单位

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

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

    Na anode; Na-O-2 batteries; O-2(-) crossover; side reactions;

    机译：Na阳极;Na-O-2电池;O-2（-）交叉;副反应;

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