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On the Cycling Performance of Na‐O2 Cells: Revealing the Impact of the Superoxide Crossover toward the Metallic Na Electrode
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-07-11 , DOI: 10.1002/adfm.201801904 Xiaoting Lin 1 , Qian Sun 1 , Hossein Yadegari 1 , Xiaofei Yang 1, 2 , Yang Zhao 1 , Changhong Wang 1 , Jianneng Liang 1 , Alicia Koo 1 , Ruying Li 1 , Xueliang Sun 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-07-11 , DOI: 10.1002/adfm.201801904 Xiaoting Lin 1 , Qian Sun 1 , Hossein Yadegari 1 , Xiaofei Yang 1, 2 , Yang Zhao 1 , Changhong Wang 1 , Jianneng Liang 1 , Alicia Koo 1 , Ruying Li 1 , Xueliang Sun 1
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Na‐O2 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‐O2 batteries is one of the major challenges facing its future development. A novel Na‐O2 battery using electrically connected carbon paper with Na metal as a protected anode is presented in this study. The O2− 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 O2− and O2 crossover toward the Na electrode. Furthermore, the short‐circuiting issue caused by Na dendrite growth also can be completely resolved. Consequently, the Na‐O2 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‐O2 batteries with longer lifespans and better cycling performance.
中文翻译：
关于Na-O2细胞的循环性能：揭示超氧化物交叉对金属Na电极的影响
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金属钠作为受保护阳极。将O 2 -从阴极到阳极的交叉部分地导致有限的库仑效率以及循环过程中的Na腐蚀。用于与保护的Na细胞，将碳纸保持与金属Na的伪等电位和工作原理的人工保护层，以抑制因被O的有害副反应2 -和O 2朝向娜电极交叉。此外，由钠枝晶生长引起的短路问题也可以完全解决。因此，Na‐O 2具有保护性Na的电池的放电容量和循环稳定性是使用裸Na的电池的两倍。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有助于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。
更新日期：2018-07-11
中文翻译：
关于Na-O2细胞的循环性能：揭示超氧化物交叉对金属Na电极的影响
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金属钠作为受保护阳极。将O 2 -从阴极到阳极的交叉部分地导致有限的库仑效率以及循环过程中的Na腐蚀。用于与保护的Na细胞，将碳纸保持与金属Na的伪等电位和工作原理的人工保护层，以抑制因被O的有害副反应2 -和O 2朝向娜电极交叉。此外，由钠枝晶生长引起的短路问题也可以完全解决。因此，Na‐O 2具有保护性Na的电池的放电容量和循环稳定性是使用裸Na的电池的两倍。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有助于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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