Effects of PEO length and phenyl unit structure on ionic conductivities of the complexes of LiClO4 and alternating copolymers of PEO having various phenyl units in the backbone |
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| Institution: | 1. Central Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, 305-8501, Japan;2. Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka, 563-8577, Japan;3. Technology Development Department, Tanaka Chemical Corporation, 45-5-10 Shirakata-cho, Fukui-shi, Fukui, 910-3131, Japan;1. Forensic Science, Chemistry Department of Malaysia, Kuala Lumpur, Malaysia;2. Forensic Medicine Department, SRM Medical College and Research Centre, Potheri, Kattangulathur (PO), Kanchipuram Dist., Tamil Nadu 603203, India;3. Department of Radiology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, 16150, Kelantan, Malaysia;4. Medical Radiation Program, School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian, 16150, Kelantan, Malaysia;5. Forensic Science Program, School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian, 16150, Kelantan, Malaysia;1. Automotive Engineering Research Institue, Jiangsu University, 301 Xuefu road, Zhenjiang 212013, P. R. China;2. School of Material Science & Engineering, Jiangsu University, Zhenjiang 212013, P. R. China;3. China Aviation Lithium Battery Co. Ltd., Luoyang 471003, China;1. Department of Physics, Politecnico di Milano, p.za Leonardo da Vinci 32, I-20133, Milano, Italy;2. Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, via G. Pascoli 70/3, I-20133, Milano, Italy;1. School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China;2. Department of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China |
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| Abstract: | A series of copolymers of predominantly poly(ethylene oxide) (PEO) with mono-phenyl (HQ), biphenyl (BP) units, or both of them (HQ/BP) in the backbone were synthesized. The solid polymer electrolytes (SPEs) were prepared from three different types of copolymers (HQ-PEG, BP-PEG, and HQ/BP-PEG) employing lithium perchlorate (LiClO4) as a lithium salt at a fixed salt concentration of EO]/Li+]=8. Their ionic conductivities were investigated to exploit the structure–ionic conductivity relationships as a function of structural change in rigid phenyl units and chain length ratio between flexible PEO chain and rigid phenyl units. As more rigid phenyl units were incorporated in the backbone chain, the formation inter- and intra-molecular complex with LiClO4 became weaker and lower ionic conductivities were observed. And it was also found that higher ionic conductivity is obtained with increasing PEO chain length because inter- and intra-molecular dissociation power of PEO increases. |
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