| 초록 |
The advancement of electrolytes has enabled the development of high-performance Li metal batteries, which have tackled intractable dendritic Li growth and irreversible Li plating/stripping. In particular, the robust electrode-electrolyte interfaces created by electrolyte additives inhibit the deterioration of the cathode and the Li metal anode during repeated cycles. Herein, we report the application of electrode-electrolyte interface modifiers, namely lithium nitrate (LiNO3) and lithium difluoro(bisoxalato) phosphate (LiDFBP) as a N and F donor, respectively. LiDFBP and LiNO3 with different electron-accepting abilities construct a mechanically robust, LiF-rich inner solid electrolyte interphase (SEI) and ion-permeable, Li3N-containing outer SEI layers on the Li metal anode, respectively. A well-structured dual-layer SEI capable of transporting Li+ ions is formed on the Li metal anode, while the cathode–electrolyte interface (CEI) on the NCM811 cathode is strengthened. Ether-based electrolytes containing LiDFBP and LiNO3 lead to 600 cycles of Li|NCM811 full cells at C/2 with 80.9% capacity retention and a high Coulombic efficiency of 99.94%. |
