Stable Li Metal Anodes via Regulating Lithium Plating/Stripping in Vertically Aligned Microchannels |
| |
| Authors: | Shu‐Hua Wang Ya‐Xia Yin Tong‐Tong Zuo Wei Dong Jin‐Yi Li Ji‐Lei Shi Chang‐Huan Zhang Nian‐Wu Li Cong‐Ju Li Yu‐Guo Guo |
| |
| Affiliation: | 1. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, P. R. China;2. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences (CAS), Beijing, P. R. China;3. Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, P. R. China |
| |
| Abstract: | Li anodes have been rapidly developed in recent years owing to the rising demand for higher‐energy‐density batteries. However, the safety issues induced by dendrites hinder the practical applications of Li anodes. Here, Li metal anodes stabilized by regulating lithium plating/stripping in vertically aligned microchannels are reported. The current density distribution and morphology evolution of the Li deposits on porous Cu current collectors are systematically analyzed. Based on simulations in COMSOL Multiphysics, the tip effect leads to preferential deposition on the microchannel walls, thus taking full advantage of the lightening rod theory of classical electromagnetism for restraining growth of Li dendrites. The Li anode with a porous Cu current collector achieves an enhanced cycle stability and a higher average Coulombic efficiency of 98.5% within 200 cycles. In addition, the resultant LiFePO4/Li full battery demonstrates excellent rate capability and stable cycling performance, thus demonstrating promise as a current collector for high‐energy‐density, safe rechargeable Li batteries. |
| |
| Keywords: | current density distribution dendrites suppressing electrodeposition lithium metal anodes tip effect |
|
|
