A lithium nucleation-diffusion-growth mechanism to govern the horizontal deposition of lithium metal anode
نویسندگان
چکیده
The severe lithium (Li) dendrite growth leads to poor cycling stability and serious safety hazards of Li metal batteries, which completely impedes their practical applications. Herein, a novel nucleation-diffusion-growth mechanism based on Li-Sn alloy/Li3N electrolyte (LS/LN) composite interface layer is proposed, synergistically guides the horizontal deposition suppress vertical side reactions with electrolyte. lithiophilic alloy captures ions nucleate preferentially sites, simultaneously Li3N low diffusion energy barrier high Li-ion conductivity efficiently transports nucleation sites during plating, consequently promoting deposition. As result, LS/LN-Li symmetric cells can stably cycle 1600 h even at current density 5 mA cm?2 capacity cm?2. LiFePO4?LS/LN-Li loading 8.2 mg present retention 93.4% after 1000 cycles, much higher than that using bare (64.8%). Furthermore, LiNi0.8Co0.1Mn0.1O2?LS/LN-Li more excellent Li. opens promising route solve challenge achieve highly stable batteries.
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ژورنال
عنوان ژورنال: Science China. Materials
سال: 2021
ISSN: ['2095-8226', '2199-4501']
DOI: https://doi.org/10.1007/s40843-020-1655-3