论文部分内容阅读
以聚偏氟乙烯-六氟丙烯P(VdF-HFP)聚合物为基体,制备了含离子液体1-甲基-3-乙基咪唑六氟磷酸盐(EMIPF6)、用于锂离子电池的离子液体复合聚合物电解质[P(VdF-HFP)/LiPF6/EMIPF6/EC(碳酸乙烯酯)-PC(碳酸丙烯酯)].采用热重分析法以及燃烧实验测试了复合聚合物电解质的热稳定性.离子电导率测试表明,离子液体的存在显著改善了复合聚合物电解质的离子传输;循环伏安测试表明,添加剂EC和PC的加入提高了复合电解质的阴极稳定性,制得的离子液体复合聚合物电解质在0.3-4.3V电压范围内稳定存在.Li4Ti5O12和LiCoO2为电极材料、P(VdF-HFP)/LiPF6/EMIPF6/EC-PC为电解质的半电池表现出优良的循环性能,0.1C充放电倍率下,Li/LiCoO2和Li/Li4Ti5O12半电池的可逆容量分别为130和144mAh·g-1.但EC、PC在一定程度上降低了离子液体复合聚合物电解质的热稳定性.
The ionic liquid 1-methyl-3-ethylimidazolium hexafluorophosphate (EMIPF6) was prepared from polyvinylidene fluoride-hexafluoropropylene (VdF-HFP) Liquid composite polymer electrolyte [P (VdF-HFP) / LiPF6 / EMIPF6 / EC (ethylene carbonate) -PC (propylene carbonate)]. The thermal stability of the composite polymer electrolytes was tested by thermogravimetric analysis and combustion experiments The ionic conductivity test showed that the presence of ionic liquid significantly improved the ion transport of the composite polymer electrolyte. Cyclic voltammetry tests showed that the addition of additives EC and PC increased the cathode stability of the composite electrolyte. The prepared ionic liquid composite polymerization The electrolyte was stable in the voltage range of 0.3-4.3 V. Li4Ti5O12 and LiCoO2 were the electrode materials, and the half-cells with P (VdF-HFP) / LiPF6 / EMIPF6 / EC-PC as electrolytes showed excellent cycling performance. The reversible capacities of Li / LiCoO2 and Li / Li4Ti5O12 half-cells were 130 and 144 mAh · g-1, respectively, while EC and PC reduced the thermal stability of the ionic liquid composite polymer electrolyte to a certain degree.