期刊
SMALL
卷 18, 期 37, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202203674
关键词
cycle stability; dendrites; electrolyte additives; shelf life; zinc anodes
类别
资金
- National Natural Science Foundation of China [51772086, 51872087, 51971089]
- Natural Science Foundation of Hunan Province [2018JJ2038, 2020JJ5021]
- Major Science and Technology Program of Changsha [kq1804010]
L-cysteine is employed as an electrolyte additive to stabilize the zinc/electrolyte interface, suppressing corrosion reactions and dendrite formation, resulting in improved cycle life and stability of zinc metal batteries.
The unstable anode/electrolyte interface (AEI) triggers the corrosion reaction and dendrite formation during cycling, hindering the practical application of zinc metal batteries. Herein, for the first time, l-cysteine (Cys) is employed to serve as an electrolyte additive for stabilizing the Zn/electrolyte interface. It is revealed that Cys additives tend to initially approach the Zn surface and then decompose into multiple effective components for suppressing parasitic reactions and Zn dendrites. As a consequence, Zn|Zn symmetric cells using trace Cys additives (0.83 mm) exhibit a steady cycle life of 1600 h, outperforming that of prior studies. Additionally, an average Coulombic efficiency of 99.6% for 250 cycles is also obtained under critical test conditions (10 mA cm(-2)/5 mAh cm(-2)). Cys additives also enable Zn-V2O5 and Zn-MnO2 full cells with an enhanced cycle stability at a low N/P ratio. More importantly, Cys/ZnSO4 electrolytes are demonstrated to be still effective after resting for half year, favoring the practical production.
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