LU Yuxiao,LIU Lei,SHI Guangyue,SUN Zhijian,MA Lei,ZHANG Lei

(College of Electronic and Information Engineering,Hebei University,Baoding 071002,China)

Abstract: Solid composite dielectric films were prepared using a tape casting method with Li1.3Al0.3Ti1.7(PO4)3(LATP) particles as filler,polyethylene oxide (PEO) as binder,LiTFSI as additive，and acetonitrile as solvent. X-ray diffraction (XRD),scanning electron microscopy (SEM)，and electrochemical impedance spectroscopy (EIS) were used to analyze the structures,morphologies，and ionic conductivities of the samples. The effects of molecular weight and content of PEO on the film forming characteristics of LATP-PEO composite electrolyte films were studied .The results show that a flexible solid composite electrolyte film with a thickness of 25 μm can be obtained when the mass ratio of LATP and PEO is 1 ∶0.43. The film processes a uniform particle distribution and high ionic conductivities of 1.36×10-5 S/cm at 25 ℃ and 4.60×10-4 S/cm at 100 ℃. The ion activation energies are 4.86 eV and 0.22 eV,respectively,when the temperatures are at -20～60 ℃ and 60～100 ℃.

Keywords: flexible solid composite electrolyte; Li1.3Al0.3Ti1.7(PO4)3; ionic conductivity; ion activation energy

中图分类号：TN4                                文献标志码：A

文章编号：1008-5548(2020)01-0009-08

DOI:10.13732/j.issn.1008-5548.2020.01.002

收稿日期： 2019-05-16，修回日期：2019-06-13，在线出版时间：2019-07-30 17:13。

基金项目：河北省自然科学基金项目，编号：F2017201130

第一作者简介：卢玉晓(1992—)，女，硕士研究生，研究方向为锂离子电池，E-mail:940049518@qq.com。

通信作者简介：刘磊(1979 —)，男，博士，副教授，研究方向为锂离子电池，E-mail:25357037@qq.com。