NDLI: The improved effect of co-doping with nano-SiO2 and nano-Al2O3 on the performance of poly(methyl methacrylate-acrylonitrile-ethyl acrylate) based gel polymer electrolyte for lithium ion batteries

Content Provider	Royal Society of Chemistry (RSC)
Author	Liao, Youhao Sun, Ping Chen, Tingting Li, Zihao Luo, Xueyi Xing, Lidan Li, Weishan
Copyright Year	2015
Abstract	In this article, we report a novel gel polymer electrolyte (GPE) for lithium ion batteries, which is prepared using poly(methyl methacrylate-acrylonitrile-ethyl acrylate) (P(MMA-AN-EA)) as a polymer matrix and doping with nano-SiO2 and nano-Al2O3 simultaneously. The influences of the ratio of the two nanoparticles on the pore structure, electrolyte uptake and thermal stability of the resulting membrane, and the ionic conductivity and electrochemical stability of the corresponding GPE are investigated by scanning electron microscopy, mechanical strength, thermogravimetry, electrochemical impedance spectroscopy, linear sweep voltammetry and cyclic voltammetry. The performance of the developed GPE is evaluated in the Li/LiNi0.5Mn1.5O4 half cell by a charge–discharge test for its application in lithium ion batteries. It is found that there exists a synergistic effect between nano-SiO2 and nano-Al2O3. The performances of the resulting membrane and the corresponding GPE are effectively improved by using nano-SiO2 and nano-Al2O3 simultaneously rather than individually. Co-doping 5 wt% nano-SiO2 and 5 wt% nano-Al2O3 provides the membrane with a higher thermal decomposition temperature of 325 °C, and a better electrolyte uptake of 198.1%, the corresponding GPE with an increased ionic conductivity of 2.2 × 10−3 S cm−1 at room temperature and an enhanced oxidative stability up to 5.5 V (vs. Li/Li+), and the LiNi0.5Mn1.5O4 cathode with an improved rate capability of 104.2 mA h g−1 at 2C and an improved capacity retention of 94.8% after 100 cycles. These improved performances result from combining the advantages of both nano-SiO2 and nano-Al2O3, in which the former contributes to the improved ionic conductivity caused by a stronger Lewis-acid property, while the latter to the better thermal and structural stabilities by its stiffness characteristic.
Starting Page	64368
Ending Page	64377
Page Count	10
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	5
Issue Number	79
Journal	RSC Advances
DOI	10.1039/c5ra10409b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Thermogravimetric analysis Cathode Polymer Ion Scanning electron microscope Composite material Linear sweep voltammetry Cyclic voltammetry Electrolyte Acrylate Dopant Electrochemistry Stiffness GPE Electrical impedance
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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