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a) Cycling stability of NMC811 cells using reference electrolyte (1.0 m LiPF6/EC‐EMC) and nonflammable LHCE (1.0 m LiFSI/FEC‐TEP‐BTFE) cycled at 4.6 V. b) Flammability tests for the reference electrolyte, and the nonflammable LHCE. c,d) Charge–discharge curves of NMC811 cells using 1.0 m LiPF6/EC‐EMC and 1.0 m LiFSI/FEC‐TEP‐BTFE cycled at 4.6 V.
