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Polymer electrolyte plasticized with PEG-borate ester having high ionic conductivity and thermal stability |
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| Authors: | Yuki Kato Kohji Hasumi Shoichi Yokoyama Takeshi Yabe Hiromasa Ikuta Yoshiharu Uchimoto Masataka Wakihara |
| Affiliation: | a Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8552, Japan b Alkylene Oxide Group 2, Oleochemicals Research Laboratory, NOF Corporation, 3-3 Chidori-cho, Kawasaki-ku, Kawasaki, Kanagawa 210-0865, Japan |
| Abstract: | We have focused on the PEG-borate ester as a new type of plasticizer for solid polymer electrolyte composed of poly(ethyleneglycol) methacrylate (PEGMA) and lithium bis-trifluoromethanesulfonimide (LiTFSI). The PEG-borate ester shows good thermal stability and high flash point. Ionic conductivity of the polymer electrolyte increases with increasing amount of the PEG-borate ester and exhibits values greater than 10−4 S cm−1 at 30 °C and 10−3 S cm−1 at 60 °C. Furthermore, PEG-borate ester has three EO chains whose lengths are variable, and various ionic conductivities are expected to depend on EO chain length. As a result, polymer electrolyte containing the PEG-borate ester whose EO chain length is n=3 shows highest ionic conductivity. Furthermore, polymer electrolytes containing PEG-borate esters show excellent thermal and electrochemical stability. The electrolytes are thermally stable up to 300 °C and electrochemically up to 4.5 V vs. Li+/Li. |
| Keywords: | Polymer electrolyte PEG-borate ester Plasticizer Ionic conductivity Thermal stability |
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