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Reversible aqueous aluminum metal batteries enabled by a water-in-salt electrolyte

Green Energy & Environment 2024年第7期9卷 1183-1191页

作者： Wenjing Tang Lijun Deng Longyuan Guo Shoubin Zhou Qinhai Jiang Jiayan Luo Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming State School of Materials Science and Engineering Shanghai Jiao Tong University School of Science Harbin Institute of Technology Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University HuaFu High Technology Energy Storage CO. LTD Shanghai Jiao Tong University Shaoxing Research Institute of Renewable Energy and Molecular Engineering

aluminum（Al）, the most abundant metallic element on the earth crust, has been reckoned as a promising battery material for its the highest theoretical volume capacity(8046 mAh cm-3). Being rechargeable in ionic liquid electrolytes, however, the Al anode and battery case suffer from corrosion. On the other hand, Al is irreversible in aqueous electrolyte with severe hydrogen evolution reaction. Here, we demonstrate a water-in-salt aluminum ion electrolyte（WISE） based on Al and lithium salts to tackle the above challenges. In the WISE system, water molecules can be confined within the Li+solvation structures. This diminished Al3+-H2O interaction essentially eliminates the hydrolysis effect, effectively protecting Al anode from corrosion. Therefore, long-term Al plating/stripping can be realized. Furthermore, two types of high-performance full batteries have been demonstrated using copper hexacyanoferrate（CuHCF, a Prussian Blue Analogues） and LiNi0.8Co0.1Mn0.1O2（NCM） as cathodes. The reversibility of Al anode laid the foundation for low cost rechargeable batteries suffering for large-scale energy *** context: Al batteries are expected to become a safe and sustainable alternative to lithium batteries. For decades, chase for a feasible Al secondary battery has not been successful. The key challenge is to find suitable cathode and electrolyte materials, together with which Al anode battery can function reversibly. Currently, fatal drawbacks have impeded the practical application of Al metal batteries（AMBs）, such as sustained corrosion of Al anode and battery case in ionic liquid electrolytes, irreversibility issues as well as severe hydrogen evolution reaction during cycling in aqueous electrolyte. Therefore, electrolyte and their electrochemical kinetics play a vital role in the performance and environmental operating limitations of high-energy Al metal batteries. In this work, we demonstrate a nearly neutral Al ion water-in-salt electrolyte（WISE） to tackle th

关键词： Water-in-salt electrolyte rechargeable aluminum anode Solvation sheath Hybrid battery Abundance

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