By increasing the charging voltage, a cell specific energy of >400 W h kg−1 is achievable with LiNi0.8Mn0.1Co0.1O2 in Li metal batteries. However, stable cycling of high-nickel cathodes at ultra-high voltages is extremely challenging. Here we report that a rationally designed sulfonamide-based electrolyte enables stable cycling of commercial LiNi0.8Co0.1Mn0.1O2 with a cut-off voltage up to 4.7 V in Li metal batteries. In contrast to commercial carbonate electrolytes, the electrolyte not only suppresses side reactions, stress-corrosion cracking, transition-metal dissolution and impedance growth on the cathode side, but also enables highly reversible Li metal stripping and plating leading to a compact morphology and low pulverization. Our lithium-metal battery delivers a specific capacity >230 mA h g−1 and an average Coulombic efficiency >99.65% over 100 cycles. Even under harsh testing conditions, the 4.7 V lithium-metal battery can retain >88% capacity for 90 cycles, advancing practical lithium-metal batteries.
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We acknowledge support by the Department of Energy, Basic Energy Sciences, under award number DE-SC0002633 (Chemomechanics of Far-From-Equilibrium Interfaces). We acknowledge the cathodes provided by the US Department of Energy CAMP Facility, Argonne National Laboratory, and the LiFSI salt by KISCO. This work made use of the Material Research Science and Engineering Center Shared Experimental Facilities supported by the National Science Foundation under award number DMR-1419807. Z.S. acknowledges the research grant at the Department of Materials Science and Engineering at the Massachusetts Institute of Technology. This work used resources of the beamline FXI/18ID of the National Synchrotron Light Source II, a US Department of Energy Office of Science User Facility operated for the Department of Energy Office of Science by Brookhaven National Laboratory under contract no. DE-SC0012704. This work used resources of the Advanced Photon Source, an Office of Science User Facility operated for the US Department of Energy Office of Science by Argonne National Laboratory, and was supported by the US Department of Energy under contract no. DE-AC02-06CH11357 and the Canadian Light Source and its funding partners. J. Lopez acknowledges support by an appointment to the Intelligence Community Postdoctoral Research Fellowship Program at the Massachusetts Institute of Technology, administered by Oak Ridge Institute for Science and Education through an interagency agreement between the US Department of Energy and the Office of the Director of National Intelligence. We also thank C. Mao at Zhu Hai Smooth Way Company for valuable suggestions and G. Leverick from Y. Shao-Horn’s group at the Massachusetts Institute of Technology for the support in measuring the water content by Karl Fisher titration.
The authors declare no competing interests.
Peer review information Nature Energy thanks Corsin Battaglia and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Xue, W., Huang, M., Li, Y. et al. Ultra-high-voltage Ni-rich layered cathodes in practical Li metal batteries enabled by a sulfonamide-based electrolyte. Nat Energy 6, 495–505 (2021). https://doi.org/10.1038/s41560-021-00792-y
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