Reversible Li Plating on Graphite Anodes through Electrolyte Engineering for Fast-Charging Batteries |
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Authors: | Xinyang Yue Jing Zhang Yongteng Dong Yuanmao Chen Zhangqin Shi Xuejiao Xu Xunlu Li Prof Zheng Liang |
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Institution: | 1. Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China;2. Beijing Key Laboratory of Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081 P. R. China;3. Solid-State Battery Research Center, Global Institute of Future Technology, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China |
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Abstract: | The difficulties to identify the rate-limiting step cause the lithium (Li) plating hard to be completely avoided on graphite anodes during fast charging. Therefore, Li plating regulation and morphology control are proposed to address this issue. Specifically, a Li plating-reversible graphite anode is achieved via a localized high-concentration electrolyte (LHCE) to successfully regulate the Li plating with high reversibility over high-rate cycling. The evolution of solid electrolyte interphase (SEI) before and after Li plating is deeply investigated to explore the interaction between the lithiation behavior and electrochemical interface polarization. Under the fact that Li plating contributes 40 % of total lithiation capacity, the stable LiF-rich SEI renders the anode a higher average Coulombic efficiency (99.9 %) throughout 240 cycles and a 99.95 % reversibility of Li plating. Consequently, a self-made 1.2-Ah LiNi0.5Mn0.3Co0.2O2 | graphite pouch cell delivers a competitive retention of 84.4 % even at 7.2 A (6 C) after 150 cycles. This work creates an ingenious bridge between the graphite anode and Li plating, for realizing the high-performance fast-charging batteries. |
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Keywords: | Fast-Charging Lithium Metal Batteries Lithium Plating Lithium-Ion Batteries Solid Electrolyte Interphase |
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