[20p-B6-1~9] 12.3 Functional Materials and Novel Devices

1:45 PM - 2:00 PM JST(4:45 AM - 5:00 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardHighlighted Presentation

[20p-B6-4] Formation of an Organized Structure and Improved Ion Conductivity of Sulfonated Polyimide Thin Films by adding Organic Solvent in Li-ion Battery

〇Kentaro Aoki¹, Suwansoontorn Athchaya¹, Mitsuo Hara², Katsuhiro Yamamoto³, Nobuyuki Zettsu^4,5, Shusaku Nagano⁶, Yuki Nagao¹ (1.JAIST, 2.Fac. of Eng. and Design, Kagawa Univ., 3.Grad. Sch. of Eng., Nagoya Inst. Tech., 4.ARG, Shinshu Univ., 5.Fac. of Eng., Shinshu Univ., 6.Grad. Sch. of Sci., Rikkyo Univ.)

Keywords:

Li-ion Battery,Polymer Electrolyte,Organized Structure

We previously found that coating a sulfonated polyimide (SPI) thin film on the cathode of a Li-ion battery as an artificial cathode-electrolyte interface resulted in an improved capacity retention rate during discharge. To elucidate the reason for this improvement, we investigated the molecular assembly structure and Li-ion conductivity of the SPI thin films with the addition of organic solvents used in Li-ion batteries. It was discovered that adding an ethylene carbonate-dimethyl carbonate mixed solvent to the SPI thin films resulted in the formation of a highly organized structure, as well as improved Li-ion conductivity.