摘要
通过倒相法原位制备P(VDF-HFP)/SiO_2复合聚合物电解质膜,将其于1.0 mol/L LiPF_6/(EC+DMC+EMC)中浸泡30 min即得复合聚合物电解质。采用扫描电子显微镜法(SEM)、X射线衍射光谱法(XRD)、线性扫描法(LSV)和交流阻抗法(EIS)分别对复合电解质的形貌、结晶度和电化学性能进行表征。SEM结果表明SiO_2溶胶原位制备的P(VDF-HFP)/SiO_2复合膜的膜层表面微孔丰富且相互连通,XRD表明其结晶度较纯P(VDF-HFP)膜减小;LSV和EIS结果表明复合膜的电化学稳定窗口为5.0 V,室温离子电导率高达3.134×10^(-3) S/cm,且其界面阻抗较直接添加SiO_2粉末制备的复合膜的920Ω下降至850Ω。
P （VDF-HFP）/SiO2 composite polymer electrolyte （CPE） membranes were prepared by phase inversion method, and the desirable CPEs were obtained after being activated into 1.0 mol/L LiPF6-EC/DMC/EMC （1 ： 1 ： 1, v/v/v） liquid electrolytes for 30 min. The physicochemical performance of the as-prepared CPEs was characterized by SEM, XRD, LSV and EIS. The results of SEM indicate that the as-prepared P（VDF-HFP）/SiO2 membrane synthesized via in-situ polymerization presents homogeneous surface and abundant interconnected micro-pores, and the results of XRD show that there may exist interaction forces between SiO2 and polymer matrix. The results of EIS and LSV also show that the ionic conductivity and electrochemical working window of P （VDF-HFP）/SiO2 CPE membrane can reach 3.134 × 10-3 S/cm and 5.0 V, respectively. And the interracial impedance is directly dropped from 920 Ωto 850 Ω compared to the as-prepared composite membrane with adding SiO2.
出处
《电源技术》
CAS
CSCD
北大核心
2017年第2期189-191,281,共4页
Chinese Journal of Power Sources
基金
国家自然科学青年基金资助项目(51404038)
湖北省教育厅科学研究计划项目(B2016040)
湖北省大学生创新创业训练计划项目(104892014018)
