摘要
通过相转化法制备基于聚氧化乙烯(PEO)/热塑性聚氨酯(TPU)/聚偏氟乙烯-六氟丙烯(PVDF-HFP)3种高聚物共混形成的电解质隔膜,将其浸泡在浓度为1 mol/L六氟磷酸锂(LiPF6)的碳酸乙烯酯(EC)-碳酸二甲酯(DMC)-碳酸甲乙酯(EMC)(三者体积比为1∶1∶1)电解液中形成一种凝胶态聚合物电解质(GPE)。采用SEM、EDS、FTIR、XRD、TG、DSC、万能拉力机和交流阻抗法对隔膜进行了表征。结果表明,m(PEO)∶m(TPU)∶m(PVDF-HFP)=3∶1∶4的隔膜具有均匀的多孔形貌,结晶峰面积最低,拉伸强度达到15 MPa左右,离子电导率为7.9×10^(–3)S/cm,综合性能最佳。将该隔膜装配成CR2032纽扣电池进行电池循环性能测试,结果表明,在0.2C倍率下电池的充放电比容量分别达到了164和161mA·h/g,在150次循环后,放电比容量仍能保持在152 mA·h/g左右,库伦效率保持97%以上,表明该GPE是一种优异的电池材料。
An electrolyte separator based on the blending of three polymers of polyethylene oxide(PEO)/thermoplastic polyurethane(TPU)/polyvinylidene fluoride-hexafluoropropylene(PVDF-HFP)was prepared by phase inversion method.And then,it was soaked in an electrolyte of ethylene carbonate(EC)-dimethyl carbonate(DMC)-ethyl methyl carbonate(EMC)(the corresponding volume ratio is 1∶1∶1)with a concentration of 1 mol/L lithium hexafluorophanate(LiPF6)to form a gel polymer electrolyte(GPE).The electrolyte separator was characterized by SEM,EDS,FTIR,XRD,TG,DSC,universal tensile machine and AC impedance method.The results showed that the separator prepared from m(PEO)∶m(TPU)∶m(PVDF-HFP)=3∶1∶4 had uniform porous morphology,the lowest crystalline peak area and exhibited the best overall performance.The tensile strength reached 15 MPa,and the ion conductivity was 7.9×10^(-3)S/cm.This separator was assembled into a CR2032 button battery for battery cycle performance testing.The results revealed that the charge-discharge specific capacity reached 164 and 161 mA·h/g at 0.2 C rate.After 150 cycles,the discharge specific capacity still maintained about 152 m A·h/g,and the coulomb efficiency remained above 97%,indicated the prepared gel polymer electrolyte is an excellent battery material.
作者
吴勰
薛照明
周莉
杨锦福
WU Xie;XUE Zhaoming;ZHOU Li;YANG Jinfu(College of Chemistry and Chemical Engineering,Anhui University,Hefei 230601,Anhui,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2021年第1期155-161,共7页
Fine Chemicals
关键词
相转化法
聚氧化乙烯
热塑性聚氨酯
聚偏氟乙烯-六氟丙烯
凝胶态聚合物电解质
有机电化学与工业
phase inversion method
polyethylene oxide
thermoplastic polyurethane
polyvinylidene fluoride-hexafluoropropylene
gel polymer electrolyte
electro-organic chemistry and industry
