Tris((2-oxo-1,3-dioxolane-4-yl)methyl) borate synthesis of lithium-ion batteries the use of

Synthesis of a novel borate ester (tris ((2-oxo-1,3-dioxolane-4-yl) methyl) borate- (B-GC) was carried out and investigated in the electrolyte of the Lithium ion battery. The basic chemical characterizations of the synthesized borate ester (NMR, FTIR, etc.) were performed. Electrolyte solutions containing 1 M LiPF6 salt were prepared and teflon cells were assembled with them using lithium as anode and LiFePO4 as cathode. It has been investigated as an electrolyte, in binary solvent component together with diethyl carbonate (DEC) and also as an additive in 1 M LiPF6-EC:DEC (1:1) reference electrolyte solution. For this purpose, basic electrochemical measurements of these electrolytes such as temperature dependent ionic conductivity, cyclic voltammetry and also charge-discharge-efficiency cycle performances of the assembled batteries have been performed. Although the synthesized borate ester was not sufficient to improve the performance of the electrolyte solution as a solvent and solvent component, it has been found to improve battery performance as an additive. Electrolytes containing 0.5%, 1% and 2% B-GC were prepared. The optimum result was found for electrolyte solution containing 1% additive as 158 mAhg-1 discharge capacity with only 7% performance loss at the end of 50 cycles.