Ding Yingyi, Han Tianli, Wu Zhao, Guan Yong, Hu Jun, Hu Chaoquan, Tian Yangchao, Liu Jinyun
Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, People's Republic of China.
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
ACS Nano. 2022 Sep 27;16(9):15369-15381. doi: 10.1021/acsnano.2c07174. Epub 2022 Sep 1.
Magnesium/lithium hybrid-ion batteries (MLHBs) combine the advantages of high safety and fast ionic kinetics, which enable them to be promising emerging energy-storage systems. Here, a high-performance MLHB using a modified all-phenyl complex with a lithium bis(trifluoromethanesulfonyl)imide electrolyte and a NiCoS cathode on a copper current collector is developed. A reversible conversion involving a copper collector with NiCoS efficiently avoids the electrolyte dissociation and diffusion difficulties of Mg ions, enabling low polarization and fast redox, which is verified by X-ray absorption near edge structure analysis. Such combination affords the best MLHB among all those ever reported, with a reversible capacity of 204.7 mAh g after 2600 cycles at 2.0 A g, and delivers an ultrahigh full electrode-basis energy density of 708 Wh kg. The developed MLHB also achieves good rate performance and temperature tolerance at -10 and 50 °C with a low electrolyte consumption. The hybrid-ion battery system presented here could inspire a broad set of engineering potentials for high-safety battery technologies and beyond.
