期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 37, 页码 21387-21401出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta04320j
关键词
-
资金
- National Natural Science Foundation of China [51974082]
This study used experiments and modeling methods to identify that charge transfer resistance is the main internal anodic resistance for ultra-high-purity (UHP) Mg discharge in Mg-air primary batteries, and the drop in anodic efficiency is caused by the anodic hydrogen reaction. In addition, it was observed that UHP Mg has a strong preferred dissolution orientation during discharge at low current densities.
This work used both experiments and modeling methods to understand some critical issues of ultra-high-purity (UHP) Mg discharge behavior for Mg-air primary batteries. The charge transfer resistance is the main internal anodic resistance instead of the resistance due to discharge products. The anodic hydrogen reaction was the only reason for the anodic efficiency drop for the UHP Mg anode. A uni-positive Mg+ mechanism explained the anodic hydrogen reaction and two morphologies of discharge products. The UHP Mg had a strong preferred dissolution orientation during discharge at a low applied current density, which tended to disappear with increasing current density. The strongly oriented dissolution of Mg increased the apparent charge transfer resistance of the Mg anode.
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