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Magnetohydrodynamic Interface-Rearranged Lithium Ions Distribution for Uniform Lithium Deposition and Stable Lithium Metal Anode |
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| Authors: | Mingming Ma Chaoqi Dai Kailin Luo Shun Li Jiahe Chen Zhendong Li Prof Xiaodi Ren Prof Deyu Wang Prof Haiyong He Prof Mingzhi Dai Prof Zhe Peng |
| Institution: | 1. Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123 P. R. China
These authors contributed equally to this work.;2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201 P. R. China These authors contributed equally to this work.;3. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201 P. R. China;4. School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, 230026 P. R. China |
| Abstract: | Uneven lithium (Li) electrodeposition hinders the wide application of high-energy-density Li metal batteries (LMBs). Current efforts mainly focus on the side-reaction suppression between Li and electrolyte, neglecting the determinant factor of mass transport in affecting Li deposition. Herein, guided Li+ mass transport under the action of a local electric field near magnetic nanoparticles or structures at the Li metal interface, known as the magnetohydrodynamic (MHD) effect, are proposed to promote uniform Li deposition. The modified Li+ trajectories are revealed by COMSOL Multiphysics simulations, and verified by the compact and disc-like Li depositions on a model Fe3O4 substrate. Furthermore, a patterned mesh with the magnetic Fe?Cr2O3 core-shell skeleton is used as a facile and efficient protective structure for Li metal anodes, enabling Li metal batteries to achieve a Coulombic efficiency of 99.5 % over 300 cycles at a high cathode loading of 5.0 mAh cm?2. The Li protection strategy based on the MHD interface design might open a new opportunity to develop high-energy-density LMBs. |
| Keywords: | coulombic efficiency dendrite lithium metal anode lithium metal batteries magnetohydrodynamic effect |