| Affiliation: | 1. State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 P. R. China College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014 P. R. China;2. State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 P. R. China;3. Institute of Fundamental and Frontier Science, University of Electronic Science and Technology of China, Chengdu, 611371 P. R. China;4. Department of Engineering Technology, Huzhou College, Huzhou, 313000 P. R. China;5. Department of Chemistry, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, 14117-13116 Iran;6. Key Laboratory of Engineering Dielectric and Applications (Ministry of Education), School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin, 150080 P. R. China;7. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014 P. R. China |
| Abstract: | Construction of high efficiency and stable Li metal anodes is extremely vital to the breakthrough of Li metal batteries. In this study, for the first time, groundbreaking in situ plasma interphase engineering is reported to construct high-quality lithium halides-dominated solid electrolyte interphase layer on Li metal to stabilize & protect the anode. Typically, SF6 plasma-induced sulfured and fluorinated interphase (SFI) is composed of LiF and Li2S, interwoven with each other to form a consecutive solid electrolyte interphase. Simultaneously, brand-new vertical Co fibers (diameter: ≈5 µm) scaffold is designed via a facile magnetic-field-assisted hydrothermal method to collaborate with plasma-enhanced Li metal anodes (SFI@Li/Co). The Co fibers scaffold accommodates active Li with mechanical integrity and decreases local current density with good lithiophilicity and low geometric tortuosity, supported by DFT calculations and COMSOL Multiphysics simulation. Consequently, the assembled symmetric cells with SFI@Li/Co anodes exhibit superior stability over 525 h with a small voltage hysteresis (125 mV at 5 mA cm−2) and improved Coulombic efficiency (99.7%), much better than the counterparts. Enhanced electrochemical performance is also demonstrated in full cells with commercial cathodes and SFI@Li/Co anode. The research offers a new route to develop advanced alkali metal anodes for energy storage. |
