A Sustainable Solid Electrolyte Interphase for High-Energy-Density Lithium Metal Batteries Under Practical Conditions |
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| Authors: | Xue-Qiang Zhang Tao Li Bo-Quan Li Rui Zhang Peng Shi Chong Yan Prof Jia-Qi Huang Prof Qiang Zhang |
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| Institution: | 1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P. R. China;2. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P. R. China
These authors contributed equally to this work.;3. Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081 P. R. China |
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| Abstract: | High-energy-density Li metal batteries suffer from a short lifespan under practical conditions, such as limited lithium, high loading cathode, and lean electrolytes, owing to the absence of appropriate solid electrolyte interphase (SEI). Herein, a sustainable SEI was designed rationally by combining fluorinated co-solvents with sustained-release additives for practical challenges. The intrinsic uniformity of SEI and the constant supplements of building blocks of SEI jointly afford to sustainable SEI. Specific spatial distributions and abundant heterogeneous grain boundaries of LiF, LiNxOy, and Li2O effectively regulate uniformity of Li deposition. In a Li metal battery with an ultrathin Li anode (33 μm), a high-loading LiNi0.5Co0.2Mn0.3O2 cathode (4.4 mAh cm?2), and lean electrolytes (6.1 g Ah?1), 83 % of initial capacity retains after 150 cycles. A pouch cell (3.5 Ah) demonstrated a specific energy of 340 Wh kg?1 for 60 cycles with lean electrolytes (2.3 g Ah?1). |
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| Keywords: | Elektrolyten Elektrolytgrenzschicht Lithiumbatterien Pouch-Zellen |
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