化工进展2024，Vol.43Issue(8)：4246-4252,7.DOI:10.16085/j.issn.1000-6613.2023-1236
锂电添加剂FEC-VC二元体系固液平衡数据的测定及回归
Measurement and regression of solid-liquid binary equilibrium data for lithium battery additive FEC-VC system
摘要
Abstract
The solid-liquid equilibrium data for binary mixtures of fluoroethylene carbonate-vinylene carbonate(FEC-VC)were determined by differential scanning calorimetry(DSC)for the lack of basic theoretical data in separation of lithium battery electrolyte additive by melt crystallization.The experimental data showed that the binary system presented a lowest eutectic point.On this basis,the activity coefficient data of binary system were calculated by activity coefficient method.With the data regression function of Aspen Plus process simulation software,the solid-liquid equilibrium data of the binary system were regressed using van laar,NRTL and Redlich-Kister models,and the regression parameters of each model were obtained.The binary solid-liquid equilibrium data were calculated by the models and the lowest eutectic type solid-liquid phase diagrams were plotted.The comparison of regression results of each model indicated that the deviation of van laar model was large,and the regression results of Redlich-Kister model were more in line with the experimental data with a standard deviation of equilibrium temperature of less than 0.005 and an average deviation of less than 1.0K.The solid-liquid equilibrium data and thermodynamics parameters were provided for the crystallization separation technology of FEC-VC system.关键词
氟代碳酸乙烯酯/结晶/热力学/相平衡/活度系数/回归Key words
fluoroethylene carbonate/crystallization/thermodynamics/phase equilibria/activity coefficient/regression分类
化学化工引用本文复制引用
向瑞,艾波,吴高胜,李瑜哲,宗睿,许保云,杜丽君..锂电添加剂FEC-VC二元体系固液平衡数据的测定及回归[J].化工进展,2024,43(8):4246-4252,7.基金项目
上海市2021年度"科技创新行动项目"(21XD1432300). （21XD1432300）
