POLYMERS AND POLYMER MATRIX COMPOSITES |
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Synthesis and Electrochemical Performance of PEO-Al2O3 Hybrid Membrane for High Safety Lithium-ion Batteries |
ZHANG Wenkui1, WANG Jia1, LI Jiaojiao1, ZHOU Xiaozheng2, YE Zhangjun2, HUANG Hui1, GAN Yongping1, XIA Yang1
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1 College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014 2 Zhejiang Godsend Power Technology Co., Ltd, Hangzhou 311245 |
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Abstract In this work, a series of polyethylene glycol oxide (PEO)-aluminium oxide (Al2O3) hybrid membranes were prepared by a slurry coating method. The effect of the mass ratio of PEO/Al2O3on the performance of PEO-Al2O3 hybrid membranes was systematically investigated. Scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TG) and combustion test were performed to reveal the morphology, element distribution, phase composition, surface chemical state and thermal stability of PEO-Al2O3 hybrid membranes. In addition, linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), porosity and electrolyte uptake test were employed to investigate the electrochemical stability, ionic conductivity, porosity and electrolyte uptake of PEO-Al2O3 hybrid membranes. The results showed that PEO-Al2O3-90 hybrid membrane had a high ionic conductivity (1.21×10-3 S/cm), high electrolyte uptake (260%), good thermal stability, high porosity (47%) and wide electrochemical stabilization window (0—4.8 V). At the current density of 0.1C, LiFePO4|PEO-Al2O3-90|Li cells assembled with PEO-Al2O3-90 hybrid membrane exhibited a high discharge specific capacity, superior cycling stability and enhanced safety.
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Published: 29 August 2019
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About author:: Wenkui Zhangobtained his Ph.D. degree in materials science and engineering from Zhejiang University in 1997. He is currently a professor and doctoral supervisor in College of Materials Science and Engineering, Zhejiang University of Technology. He has published more than 110 journal papers, applied more than 80 national invention patents and 31 of them were authorized. His research activities mainly focus on advanced se-condary batteries and energy storage/conversion mate-rials such as lithium-ion batteries, lithium-sulfur batteries, fuel cells, and supercapacitors.Yang Xiareceived his Ph.D. degree in materials scie-nce and engineering from Zhejiang University of Technology in Sep. 2008—Jan. 2013. He is currently an associate professor and master supervisor at College of Materials Science and Engineering, Zhejiang University of Technology. He worked in Arumugam Manthiram’ laboratory as an exchange scholar at the University of Texas at Austin in 2017. He has published more than 100 journal papers, applied 48 national invention patents and 18 of them were authorized. His research interests focus on carbon materials derived from biomass for lithium-ion batteries, lithium-sulfur batte-ries, and supercapacitors. |
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