Tailoring the metal electrode morphology via electrochemical protocol optimization for long-lasting aqueous zinc batteries

Qing Li, Ao Chen, Donghong Wang, Yuwei Zhao, Xiaoqi Wang, Xu Jin, Bo Xiong and Chunyi Zhi ()
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Qing Li: City University of Hong Kong
Ao Chen: City University of Hong Kong
Donghong Wang: Hong Kong Center for Cerebro-Cardiovascular Health Engineering (COCHE)
Yuwei Zhao: City University of Hong Kong
Xiaoqi Wang: Research Center of New Energy
Xu Jin: Research Center of New Energy
Bo Xiong: Research Center of New Energy
Chunyi Zhi: City University of Hong Kong

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Aqueous zinc metal batteries are a viable candidate for cost-effective energy storage. However, the cycle life of the cell is adversely affected by the morphological evolution of the metal electrode surface upon prolonged cycling. Here, we investigate different electrochemical protocols to favour the formation of stable zinc metal electrode surface morphologies. By coupling electrochemical and optical microscopy measurements, we demonstrate that an initial zinc deposition on the metal electrode allows homogeneous stripping and plating processes during prolonged cycling in symmetric Zn||Zn cell. Interestingly, when an initially plated zinc metal electrode is tested in combination with a manganese dioxide-based positive electrode and a two molar zinc sulfate aqueous electrolyte solution in coin cell configuration, a specific discharge capacity of about 90 mAh g−1 can be delivered after 2000 cycles at around 5.6 mA cm−2 and 25 °C.

Date: 2022
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DOI: 10.1038/s41467-022-31461-7

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