Multivalent Al metal anodes (AMAs) can deliver high specific/volumetric capacities (2980 mA h g−1/8046 mA h cm−3) in chloroaluminate ionic liquid-based electrolytes (ILEs). However, strong corrosion of their surfaces and poor charge transfer kinetics in acidic ILEs remain critical obstacles to realizing high-performance AMAs. In this study, a 3D-structured bifunctional MXene paper electrode (3D-BMPE), which has distinctive material properties, such as high electrical conductivity, high elastic modulus, a large number of nanopores, and multitudinous oxygen functional groups, was fabricated to protect Al deposition/dissolution reactions with improved redox kinetics. The 3D-BMPE obstructed Al corrosion during the long rest time in the ILE and consecutive cycling process, resulting in a significantly stable cycling performance of the 3D-BMPE-based AMA over 2000 cycles. Furthermore, Al nucleation and growth reactions were catalyzed in the nanoporous structure surrounded by the highly functionalized MXene surfaces, which reduced overpotentials by one-sixth, resulting in highly improved coulombic efficiencies of ∼99.9%. Moreover, the excellent electrochemical performance of the 3D-BMPE-based AMA was confirmed in Al-based dual-ion battery full cells, demonstrating the significant role played by 3D-BMPEs for AMAs.
Bibliographical noteFunding Information:
The authors acknowledge Sookyung Huh for her contribution to MXene synthesis. This research was supported by a National Research Foundation of Korea (NRF) grant (2021R1C1C1006385), funded by the Ministry of Science and ICT (MSIT). This research was supported by a National Research Council of Science & Technology (NST) grant from the Korean government (MSIT) (CRC22031-000). This work was supported by the KU-KIST School Program. This research was supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF), funded by the Ministry of Education (NRF-2019R1A2C1084836 and NRF-2021R1A4A2001403).
© 2023 The Royal Society of Chemistry.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)