A Novel Electrolyte Salt Additive for Lithium‐Ion Batteries with Voltages Greater than 4.7 V

Here, lithium bis(2-methyl-2-fluoromalonato)borate (LiBMFMB), as an additive in conventional electrolyte for LiNi_0.5Mn_1.5O₄, exhibits improved coulombic efficiencies and cycling stability. Cyclic voltammograms indicate the cells with additive form good SEIs during the first cycle whereas no additive cell needs more cycles to form a functional SEI. XPS reveals LiBMFMB could reduce the decomposition of LiPF₆ salt and solvents, resulting in thinner SEI.