以1,3-氮氧杂环戊-2-酮系列衍生物为基础的有机电解质材料性能研究

Study on performance of organic electrolyte based on ramifications of 2-oxazolidinone

合成制备了OZO(1,3-氮氧杂环戊-2-酮)的系列衍生物作为有机溶剂,对添加不同锂盐的电解液的电化学性能进行了比较研究,结合量化计算分析表明各有机分子由于取代基团的不同而物化性能存在一定差异。其中0.75 mol/L LiPF6/N-乙基-4-甲基-1,3-氮氧杂环戊-2-酮(EMOZO)的离子电导率最大,25℃时为3.05×10-3S/cm,80℃为9.73×10-3S/cm。将该类电解液应用到活性炭双电层电容器中,表现出典型的电容特性,并具有良好的可逆性和循环特性。

The electrochemical performance of the organic electrolytes based on ramifications of 2-oxazolidinone containing different lithium salts are studied with AC impedance spectroscopy. The quantum chemistry calculations with nonlocal density function theory （DFT） indicated that the substitution group of organic molecules influences the ionic conductivity of electrolyte. Of all the electrolytes,0. 75 mol/L LiPF6/N-ethylene-4-methyl-2-oxazolidinone（EMOZO） shows the highest ionic conductivity, 3.05 × 10^-3 S/cm at 25℃ and 9.73 × 10^-3 S/cm at 80℃ .In order to evaluate the performance of the electrolyte in practical electrochemical devices,an electric double layer capacitor is assembled with 0. 75mol/L LiPF6/EMOZO. The experiments show that the capacitor has the typical capacitance characteristics and good reversibility and cycle ability.