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Polyelectrolyte-TiO2 modified PVDF porous membrane and its electrochemical properties

Authors： YANG Rui1 , QIN Zhenping1, LI Mingye2, ZHAO Yao2, WANG Feng1, LI Fan1, GUO Hongxia2

Units： 1 Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Chemical Engineering, Beijing University of Technology;

KeyWords： PVDF porous membrane; battery separators; lithium-ion conductivity; cycle performance

ClassificationCode：TB43

year,volume(issue):pagination： 2020,40(6):51-57

Abstract：

The PVDF porous membrane was coated by the hybrid of polyelectrolyte and the modified TiO2 nanoparticles for using as lithium-ion battery separator. The variation of interface impedance, ionic conductivity and the electrochemical property of PVDF membrane before and after modification were investigated respectively. The results showed that the electrochemical performance of the modified PVDF/PDDA-TiO2 separator was obviously improved comparing with that of PVDF pristine membrane. The ionic conductivity of the PVDF/PDDA-TiO2 separator increased from 1.61×10-4 S/cm to 3.12×10-4 S/cm, while the interface impedance decreased from 114.5 Ω of the pristine PVDF separator to 96.9 Ω of the PVDF/PDDA-TiO2 separator. When the separator was assembled into lithium-ion battery, the discharged specific capacity was 75.5% after 100 cycles at 0.2C ratio.

Funds：

国家自然科学基金(21878003)，国家自然科学基金创新群体(51621003)

AuthorIntro：

杨蕊(1997-)，女，北京市人，本科生，研究方向为聚电解质功能杂化膜

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