We propose a carbonate-based electrolyte optimized with dual cations and ionic liquid for high-efficiency Li metal batteries with a high-voltage cathode. An average coulombic efficiency of Li deposition of 99.6% is achieved due to the salt-rich solid electrolyte interphase and Na guided uniform Li plating. The Li||NCM811 cells can be cycled with limited Li (N/P = 1) over 90 cycles. An additional advantage is that it improves the thermal stability of the NCM811 cathode. This journal is
Bibliographical noteFunding Information:
We acknowledge the funding from the National Natural Science Foundation of China (No. 21875045), National Key Research and Development Program of China (2016YFB0901500), the Shanghai Science & Technology Committee (19DZ2270100) and the U.S. Department of Energy, Office of Basic Energy Sciences (DE-FG02-17ER16362).
© 2020 The Royal Society of Chemistry.
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