期刊
NANO RESEARCH
卷 16, 期 9, 页码 11604-11611出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-5157-x
关键词
zinc ion batteries; Zn anodes; Ni-Zn alloy; migration mechanism
This study proposes a strategy for the protection of negative electrodes in aqueous zinc ion batteries (AZIBs) by artificially constructing a Ni-Zn alloy layer as a solid-electrolyte interface (SEI). The Ni-Zn alloy layer acts as a dynamic shield at the electrode/electrolyte interface, guiding the horizontal deposition of zinc and suppressing dendrite formation. The Ni-Zn alloy symmetric cell exhibits significantly improved cycle life and stable operation.
Aqueous zinc ion batteries (AZIBs) are ideal candidates for large-scale battery storage, with a high theoretical specific capacity, ecological friendliness, and extremely low cost but are strongly hindered by zinc dendrite growth. Herein, Ni-Zn alloy is artificially constructed as a solid-electrolyte interface (SEI) for Zn anodes by electrodeposition and annealing. The Ni-Zn alloy layer acts as a dynamic shield at the electrode/electrolyte interface. Interestingly, the zinc atoms migrate out of the electrode body during zinc stripping while merging into the electrode body during the plating. In this way, the Ni-Zn alloy is able to guide the zinc deposition in the horizontal direction, thereby suppressing the formation of dendrite. Benefiting from those, the Ni-Zn alloy symmetric cell shows a greatly improved cycle life and is able to operate stably for 1,900 h at a current density of 0.5 mA.cm(-2). The present study is a strategy for negative electrode protection of AZIBs.
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