Si/Ti分子筛掺杂聚合物电解质的制备及性能研究
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摘要
本文通过倒相法制备了三种不同含量的Si/Ti分子筛掺杂PVDF-HFP基复合聚合物电解质膜,采用SEM、XRD、TG和电化学等手段对其性能进行了表征。SEM结果表明,10%Si/Ti分子筛掺杂PVDF-HFP基复合聚合物电解质膜表面均匀、孔径适当且内部含有丰富的相互连通的小孔;XRD谱图结果表明,Si/Ti分子筛与聚合物基体分子间的作用力明显影响基体材料的结晶情况;TG结果表明分子筛改性膜的热稳定性有明显的提高,高达400℃仍能保持良好的热稳定性,且改性膜在120℃环境中的热收缩率仅为8%;EIS和LSV结果表明,10%Si/Ti分子筛掺杂改性膜的电导率和电化学稳定窗口得到明显的改进,其离子电导率和电化学稳定窗口分别高达3.65 mS·cm~(-1)和5.20 V。将其组装成电池性能测试表明,该复合聚合物电解质与LiCoO_2和石墨电极具有很好的匹配性。
引文
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[3]Lee Y S,Lee J H,Choi J A,et al.Cycling characteristics of lithium powder polymer batteries sssembled with composite gel polymer electrolytes and lithium powder anode[J].Advanced Functional Materials,2013,23(8):1019-1027.
[4]Guo Y G,Hu J S,Wan L J.Nanostructured materials for electrochemical energy conversion and storage devices[J].Advanced Materials,2008,20(15):2878-2887.
[5]Chen J.Recent progress in advanced materials for lithium ion batteries[J].Materials,2013,6(1):156-183.