In Situ Artificial Hybrid SEI Layer Enabled High-Performance Prelithiated SiOx Anode for Lithium-Ion Batteries |
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| Authors: | Yi Sun Kuanxin Zhang Run Chai Yueda Wang Xianhong Rui Kang Wang Huaxia Deng Hongfa Xiang |
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| Affiliation: | 1. School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui, 230009 P. R. China;2. School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006 P. R. China;3. CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui, 230009 P. R. China |
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| Abstract: | Considered the promising anode material for next-generation high-energy lithium-ion batteries, SiOx has been slow to commercialize due to its low initial Coulombic efficiency (ICE) and unstable solid electrolyte interface (SEI) layer, which leads to reduced full-cell energy density, short cycling lives, and poor rate performance. Herein, a novel strategy is proposed to in situ construct an artificial hybrid SEI layer consisting of LiF and Li3Sb on a prelithiated SiOx anode via spontaneous chemical reaction with SbF3. In addition to the increasing ICE (94.5%), the preformed artificial SEI layer with long-term cycle stability and enhanced Li+ transport capability enables a remarkable improvement in capacity retention and rate capability for modified SiOx. Furthermore, the full cell using Li(Ni0.8Co0.1Mn0.1)O2 and a pre-treated anode exhibits high ICE (86.0%) and capacity retention (86.6%) after 100 cycles at 0.5 C. This study provides a fresh insight into how to obtain stable interface on a prelithiated SiOx anode for high energy and long lifespan lithium-ion batteries. |
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| Keywords: | artificial solid-electrolyte interfaces initial coulombic efficiency lithium-ion batteries prelithiation SiOx anodes |
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