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Reversible aqueous Zn battery anode enabled by a stable complexation adsorbent interface

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Ou, Yangtao 
Cai, Zhao 
Wang, Jindi 
Zhan, Renming 
Liu, Shiyu 


jats:titleAbstract</jats:title>jats:pRechargeable aqueous Zn batteries (RAZBs) are highly promising for grid‐scale energy storage systems. Nevertheless, strong water molecule adsorption on Zn electrode provokes undesired corrosion reactions and electrode polarization/dendrite growth, restricting the reversibility of Zn anode and the commercialization of RAZBs. Herein, ethylenediamine tetraacetic acid (EDTA), a typical compounding ingredient, was applied in aqueous ZnSOjats:sub4</jats:sub> electrolyte to replace the adsorbed water molecules on Zn surface and enabled a stable complexation adsorbent interface. The chemically adsorbed EDTA layer reduced the direct contact between Hjats:sub2</jats:sub>O molecules and metallic Zn, and reduced the corrosion rate to more than a half. Moreover, such adsorbent interface featuring abundant oxygen/nitrogen‐based functional groups regulated Zn deposition kinetics and promoted the uniform Zn plating. As consequence, the stable complexation adsorbent interface enabled highly‐reversible Zn stripping/plating behavior for 5000 h under a harsh dynamic measurement that combining eletrochemical cycling at 1 mA cmjats:sup−2</jats:sup> and 0.5 mAh cmjats:sup−2</jats:sup> for 72 h and resting for 24 h. The effectiveness of such complexation adsorbent interface was also verified in MnOjats:sub2</jats:sub>||Zn full cells. The complexation interface chemistry demonstrated in this study opened up new avenues for the design of low‐cost and highly reversible Zn metal electrodes towards next‐generation RAZBs. <jats:boxed-text content-type="graphic" position="anchor"><jats:graphic xmlns:xlink="" mimetype="image/png" position="anchor" specific-use="enlarged-web-image" xlink:href="graphic/eom212167-gra-0001-m.png">jats:alt-textimage</jats:alt-text></jats:graphic></jats:boxed-text></jats:p>


Funder: Innovation Fund of Wuhan National Laboratory for Optoelectronics of Huazhong University of Science and Technology


34 Chemical Sciences, 3406 Physical Chemistry, 7 Affordable and Clean Energy

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China Postdoctoral Science Foundation (2020T130223, 2018M640694)