Steel Anti-Corrosion Strategy Enables Long-Cycle Zn Anode |
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Authors: | Han Tian Jin-Lin Yang Yirui Deng Wenhao Tang Ruiping Liu Chenyang Xu Peng Han Hong Jin Fan |
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Institution: | 1. Department of Materials Science and Engineering, China University of Mining and Technology (Beijing), Beijing, 100083 P. R. China;2. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371 Singapore |
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Abstract: | The progress of aqueous zinc batteries (AZBs) is limited by the poor cycling life due to Zn anode instability, including dendrite growth, surface corrosion, and passivation. Inspired by the anti-corrosion strategy of steel industry, a compounding corrosion inhibitor (CCI) is employed as the electrolyte additive for Zn metal anode protection. It is shown that CCI can spontaneously generate a uniform and ≈30 nm thick solid-electrolyte interphase (SEI) layer on Zn anode with a strong adhesion via Zn? O bonding. This SEI layer efficiently prohibits water corrosion and guides homogeneous Zn deposition without obvious dendrite formation. This enables reversible Zn deposition and dissolution for over 1100 h under the condition of 1 mA cm?2 and 1 mAh cm?2 in symmetric cells. The Zn-MnO2 full cells with CCI-modified electrolyte deliver an ultralow capacity decay rate (0.013% per cycle) at 0.5 A g?1 over 1000 cycles. Such an innovative strategy paves a low-cost way to achieve AZBs with long lifespan. |
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Keywords: | aqueous Zn-ion batteries Zn metal anodes dendrites suppression compounding corrosion inhibitors organic solid-electrolyte interphase |
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