Ag Plumes Grown on Cu for Li-Lean Anode of High Energy Density Li-Metal Batteries
ACS APPLIED ENERGY MATERIALS(2023)
摘要
Li metal combines the advantages of low redox potentialand hightheoretical specific capacity, being an ideal candidate anode forhigh energy density secondary batteries. However, Li-metal anode tendsto grow dendrites that are highly reactive to electrolyte and causeissues such as fast capacity decaying and safety risk. To addressthese issues, we propose a Li-lean anode featuring Ag plumes on Cusubstrate. The Ag plumes are grown on Cu substrate by immersing Cufoil in AgF aqueous solution, and the Li-lean anode is fabricatedby depositing Li on the grown Ag plumes. Thanks to the large specificsurface area and the low Li depositing/stripping overpotential ofthe Ag plumes, the as-fabricated Li-lean anode allows the cell tomatch with LiFePO4 cathode with excellent cyclic stability.Compared with the bare Cu electrode, the as-fabricated Li-lean anodeimproves the capacity retention of the cell with a LFP loading of0.4 mAh cm(-2) from 9 to 81% after 300 cycles at 1C between 2.0 and 4.0 V. The facile formation of Ag plumes makes itpossible for high energy density Li-metal batteries to be appliedin a large scale.
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关键词
Ag plumes,Cu substrate,Li-lean anode,Li-metal batteries,cyclic stability
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