Presentation Information
[24p-1BC-10]Lithium Ion Conduction and Interfacial Structure of Sulfonated Polyimide Thin Films
〇Yuki Nagao1, Kentaro Aoki1, Athchaya Suwansoontorn1, Mitsuo Hara2, Seiya Ikuta1, Tsukasa Miyazaki3, Noboru Miyata4, Hiroyuki Aoki5,6, Attila Taborosi7, Michihisa Koyama7, Shusaku Nagano8, Katsuhiro Yamamoto9 (1.JAIST, 2.Nagoya Univ., 3.Kyoto Univ., 4.CROSS, 5.JAEA, 6.KEK, 7.Shinshu Univ., 8.Rikkyo Univ., 9.Nagoya Inst. Tech.)
Keywords:
Li-ion battery,Ion-conductive polymers,Lyotropic liquid crystalline property
In the previous study, we reported that a lithium-conducting sulfonated polyimide with lyotropic liquid crystalline properties improves the discharge rate characteristics when applied to the cathode of a Li-ion battery. In this work, we investigated the interfacial structure by neutron reflectometry and atomic force microscopy. We also investigated Li ion conductivity by impedance measurements. We found an interfacial layer (2-5 nm thickness) with a different density on the substrate side. When organic solvent for Li ion battery was exposed to a thin film, the lithium ion conductivity improves by 10,000 times compared to the dry state.