Optimizing the composition of LiFSI-based electrolytes by a method combining simplex with normalization.

The optimizing method of electrolyte formulation is always vital for the development of high-performance lithium-ion batteries. Traditional optimization methods are mainly aimed at the optimization of the electrolyte composition type, and less attention is paid to the optimization of the composition proportion in a certain electrolyte formulation. In this paper, in order to balance the relationship between aluminum (Al) foil corrosion inhibition and battery electrochemical performance, the electrolyte system LiFSI 0.6 -LiBOB 0.4 -EC/DEC/EMC (1 : 1 : 1, by volume) was optimized by combining the simplex method, normalization and electrochemical testing. A lithium iron phosphate (LiFePO 4 ) cathode with the optimized electrolyte of LiFSI 0.53 -LiBOB 0.35 -EC/DEC/EMC (1.3 : 1.5 : 1.5) delivers a high capacity (143.1 mA h g -1 at 0.5C) and remarkable cycle life (94.9% retention after 100 cycles) at 45 °C. The outstanding performance is attributed to the composition of the cathode electrolyte interphase (CEI) containing the solid and dense LiF, AlF 3 , B 2 O 3 and Li 2 CO 3 . This provides a new method and idea for future electrolyte formulation optimization.