2-氰基乙醚增塑PAN/EVA/LiTFSI聚合物电解质研究

2-cyanoethyl ether plasticized PAN/EVA/LiTFSI polymer electrolyte

使用2-氰基乙醚作为聚丙烯腈/乙烯-醋酸乙烯共聚物/双-三氟甲基磺酰亚胺锂(PAN/EVA/Li TFSI)聚合物电解质增塑剂,采用交流阻抗(EIS)、循环伏安法(CV)等研究了增塑剂对PAN/EVA/Li TFSI聚合物电解质电性能;采用力学拉伸、扫描电镜(SEM)等测试方法考察了该聚合物电解质的力学性能和微观形态。结果表明:2-氰基乙醚增塑的(PAN/EVA/Li TFSI)聚合物电解质室温离子电导率由2.57×10-8 S/cm增加至1.28×10-5 S/cm,提高了3个数量级,离子传递活化能由61.56 k J/mol下降至29.55 k J/mol,增塑的PAN/EVA/Li TFSI聚合物电解质膜呈现较好的机械强度。

In this work,2-cyanoethyl ether was uesd as a plasticizer in the polymer electrolytes, which consisted of poly（acrylonitrile/ethylene-vinyl acetate）（PAN/EVA） and bis-trifluoromethanesulfon imide lithium salt（Li TFSI）.Electrical properties were studied by AC-impedance（EIS）and cyclic voltammetry（CV）. In addition, mechanical stretching machine and scanning electron microscopy（SEM）were employed to investigate the polymer electrolyte＇s mechanical and morphology properties. The results show that： the conductivity of 2-cyanoethyl ether（PAN/EVA/Li TFSI） plasticized polymer electrolyte is increased from 2.57×10-8 S/cm to 1.28×10-5 S/cm at room temperature, which improves 3 magnitude; the ion conductivity activation energy is decreased from 61.56 k J/mol to29.55 k J/mol. As a result, plasticized PAN/EVA/Li TFSI polymer electrolyte membrane showed better mechanical strength.