Origins of Dendrite Formation in Sodium–Oxygen Batteries and Possible Countermeasures
Origins of Dendrite Formation in Sodium–Oxygen Batteries and Possible Countermeasures
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DOI：
10.1002/ente.201700326
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发表时间：
2017-12
影响因子：
3.8
通讯作者：
Lukas Medenbach;C. L. Bender;Ronja Haas;B. Mogwitz;C. Pompe;P. Adelhelm;D. Schröder;J. Janek
中科院分区：
文献类型：
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作者：
Lukas Medenbach;C. L. Bender;Ronja Haas;B. Mogwitz;C. Pompe;P. Adelhelm;D. Schröder;J. Janek
金属氧电池循环寿命的一个限制现象是在金属电镀(电池充电)过程中树枝晶的生长。对于相对较新的钠氧电池，到目前为止，这方面的研究还很少。因此，本文对枝晶的形成进行了系统的研究，目的是更详细地了解枝晶的形成机制和相关的控制参数。电化学阻抗谱、循环实验和光学表征技术被应用于原位和非原位；通过管状玻璃池首次直接观察到了钠树枝晶的生长。从理论上讨论了不稳定表面形貌的生长，以理解实验观察到的枝晶生长。此外，还讨论了针对枝晶问题的对策，以期提高钠氧电池的循环寿命。
One limiting phenomenon for the cycle life of metal–oxygen batteries is the growth of dendrites during metal plating (cell charging). For the relatively new sodium–oxygen cell, this subject has been scarcely investigated, until now. Therefore, dendrite formation is systematically investigated herein, with the aim of gaining a more detailed understanding of the underlying mechanisms and relevant control parameters. Electrochemical impedance spectroscopy, cycling experiments, and optical characterization techniques are applied in situ and ex situ; sodium dendrite growth is directly visualized, for the first time, by means of a tubular glass cell. The growth of instable surface morphologies is discussed from a theoretical perspective to comprehend the experimentally observed dendrite growth. Furthermore, countermeasures against issues with dendrites are discussed, with the aim of increasing the cycle life of sodium–oxygen batteries.