Abstract
With the increasing demand for high energy density energy storage device,Li metal has received inten-sive attention for its ultrahigh capacity and the lowest redox potential.LiNO3 is widely used as electrolyte additive for ether electrolyte,which can improve the cycle performance of Li metal anode.Compared to ethers,carbonates are more suitable for Li metal batteries with high voltage cathode because they have a wider electrochemical window.However,LiNO3 performs poor solubility in carbonate electrolyte,re-stricting its application in high voltage Li battery.Herein,we presented a facile method to introduce abundant LiNO3 additive to carbonate electrolyte system by introducing LiNO3-PAN es as the interlayer of the cell.LiNO3-PAN es is in sufficient contact with the electrolyte so that it can continuously releases LiNO3 to assist the formation of Li2N2O2-rich single nitrogenous component SEI layer on Li surface.With the help of LiNO3-PAN es,Li metal anode shows excellent cycle stability even at a high current density of 4mA/cm2,so that the cycle performance of the full cells was significantly improved,whether in the anode-free Cu||LFP cell or the Li||NCM622 cell.
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