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Study of poly(organic palygorskite-methyl methacrylate)/poly(ethylene oxide) blended gel polymer electrolyte for lithium-ion batteries |
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| Authors: | Ge Yuan Hairong Zhang Mengkun Wang Xindong Chen Haijun Guo Xinde Chen |
| Affiliation: | 1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China
Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, China Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, China R&D Center of Xuyi Attapulgite Applied Technology, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Xuyi, China University of Chinese Academy of Sciences, Beijing, China;2. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China;3. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, China Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, China R&D Center of Xuyi Attapulgite Applied Technology, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Xuyi, China |
| Abstract: | In this study, the composite polymer was prepared by blending poly(ethylene oxide) (PEO) and POPM (the copolymer of methyl methacrylate MMA] and organically modified palygorskite), and then the composite polymer based membrane was obtained by phase-inversion method. The scanning electron microscopy results showed that the composite polymer membrane has a three-dimensional network structure. X-ray diffraction results indicated that the crystalline region of PEO is disappeared when introduction of a certain amount of the PEO. Meanwhile, the elongation of composite polymer membrane increased when increasing PEO concentration, but the value of tensile strength of PEO-POPM membrane decreased. When the mass fraction of PEO was 24%, the porosity and maximum value of ionic conductivity of the composite polymer membrane were 54% and 2.41 mS/cm, respectively. The electrochemical stability window of Li/gel composite polymer electrolyte/stainless steel batteries was close to 5.3 V (vs. Li+/Li), and the battery of Li/gel composite polymer electrolyte/LiFePO4 showed good cycling performance and the discharge capacity of the battery were between 169.8 and 155 mAh/g. Meanwhile, the Coulombic efficiency of the battery maintained over 95% during the 80 cycles. |
| Keywords: | batteries and fuel cells electrochemistry polyelectrolytes |