Li/Li + ). Consequently, dilute ether electrolytes have usually been utilized in LMBs with cathodes below 4 V (for example, LiFePO4 and sulfur). Therefore, research on the design of dilute ether electrolytes with extraordinary oxidation stability has drawn much attention and become one of the frontiers in the battery community. The early entry of ether electrolytes for high-voltage LMBs adopted the high-concentration formulations (e.g., triglyme and tetraglyme solvents with equimolar Li salt). Although the oxidation stability can be improved to ~5 V on the platinum electrode, only limited cycling stability (200 cycles) was achieved on the LiCoO2 cathode with a cutoff voltage of 4.2 V. Until now, the high-concentration ether electrolytes and localized high-concentration ether electrolytes effectively developed for 4.3/4.4 V NMC cathodes have all followed the same design concept, namely, high salt/solvent molar ratio. Meanwhile, elimination of unbound (free) solvents of electrolyte and formation of stable cathode-electrolyte interphase (CEI) have become generally accepted views on the improved oxidation stability. In particular, the high-concentration ether electrolytes usually suffer from the economic effectiveness, high viscosity and slow dynamics. Even for the localized highconcentration electrolyte formulation evaluated for practical applications, the usage of hydrofluoroether diluents still results in possible environmental hazards. Hence, compared with these salt-concentrated solutions, dilute ether electrolytes are thus long required to have high-voltage tolerance; however, limited by their intrinsic poor oxidation stability, such achievements are rarely reported. Recently, a molecular design strategy was proposed by introducing fluorinated segment into the ether backbone to improve the oxidation stability of ether. These delicately designed ether electrolytes share the common feature of high-voltage tolerance with the hydrofluoroethers. As a consequence, at 1 M salt concentration, these amended ethers have been successfully used with NMC811 cathodes with cutoff voltages up to 4.4/4.6/4.8 V. This molecular design concept is a remarkable breakthrough in ether electrolyte engineering; however, the changes of ether are often not easily handled due to their delicate synthesis technique. Therefore, a simple handling design for achieving high-voltage electrolytes in 1 M salt concentration with ether solvent unchanged is still highly desired.