【作者】 盛喜忧； 仇卫华； 连芳； 刘伟； 黄佳原； 赵海雷； 康晓丽；

【Author】 Xiyou Sheng Weihua Qiu Fang Lian Wei Liu Jiayuan Huang Hailei Zhao Xiaoli Kang Beijing Key Lab.of New Energy Materials and Technologies,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,,China

【机构】 北京科技大学材料科学与工程学院北京新能源材料与技术重点实验室；

【摘要】 为提高锂离子电池安全性,本文制备了锂离子电池阻燃添加剂-三氟乙氧基磷酸醋（TFP）。通过红外（IR） 光谱法鉴定了产物结构；讨论了反应时间、反应物浓度比与产率的关系；以及 TFP 的加入对 1mol/L LiPF₆EC/EMC/DMC（1：1：1Vol．）电解液的可燃性、分解电压和离子电导率的影响。结果表明：反应时间、反应物浓度比对 TFP 产率影响较为明显,当催化剂为15mol．%（相对于三氯氧磷）,反应时间6h,三氟乙醇与三氯氧磷摩尔比为6： 1时,TFP 的产率可以达到94．00%；添加 TFP 对电解液阻燃效果显著,对电解液的分解电压无不利影响,电解液电导率会有所下降,对 Li/LiCoO₂电池的比容量影响不大。更多还原

【Abstract】 To insure the safety of Lithium-ion batteries,we synthesized Tris（2,2,2-trifluoreethyl）phosphate （TFP）and applied it to electrolytes as flame-retarded additive.The chemical structure of the product was determined by means of infrared spectroscopy.The relation between reaction time,raw stuff concentration and the output was discussed.The effects of the addition of TFP on the flammability,decomposition voltage and ion-conductivity of the LiPF₆ EC/EMC/DMC（1:1:1 Vol.）electrolyte were researched.We found that the output would be significantly influenced by the reaction time and raw stuff concentration. The output would be improved to 94% when the activator was 15mol.%（vs.Phosphorus oxychloride）, with 6 hours’ reaction time and 6:1 mol rate of 2,2,2-Trifluoreethyl alcohol and Phosphorus oxychloride. The addition of TFP decreased the flammability of electrolytes greatly and had no negative impact on the discharge capacity.The conductivity might decrease a little as well.However,the discharge capacity of the Li/LiCoO₂ half cell changed monotonously.更多还原