Lithium
metal batteries based on metallic Li anodes have
been recognized
as competitive substitutes for current energy storage technologies
due to their exceptional advantage in energy density. Nevertheless,
their practical applications are greatly hindered by the safety concerns
caused by lithium dendrites. Herein, we fabricate an artificial solid
electrolyte interface (SEI) via a simple replacement reaction for
the lithium anode (designated as LNA-Li) and demonstrate its effectiveness
in suppressing the formation of lithium dendrites. The SEI is composed
of LiF and nano-Ag. The former can facilitate the horizontal deposition
of Li, while the latter can guide the uniform and dense lithium deposition.
Benefiting from the synergetic effect of LiF and Ag, the LNA-Li anode
exhibits excellent stability during long-term cycling. For example,
the LNA-Li//LNA-Li symmetric cell can cycle stably for 1300 and 600
h at the current densities of 1 and 10 mA cm–2,
respectively. Impressively, when matching with LiFePO4,
the full cells can steadily cycle for 1000 times without obvious capacity
attenuation. In addition, the modified LNA-Li anode coupled with the
NCM cathode also exhibits good cycling performance.
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