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Oral presentation

Mesoscopic Li distribution analysis on an all solid battery

Saito, Tsohiya*; Yamazaki, Akiyoshi*; Kamiya, Tomihiro; Fujita, Kazuhisa*; Mima, Kunioki*; Kato, Yoshiaki*; Iba, Hideki*

no journal, , 

Oral presentation

Fuel cell performance of graft type of poly (ether ether ketone) electrolyte membranes

Hasegawa, Shin; Chen, J.; Koshikawa, Hiroshi; Maekawa, Yasunari

no journal, , 

Radiation-induced graft polymerization is a fascinating technique for introducing functional polymer phases as grafting chains (grafts) directly onto polymer films allowing those films to retain their characteristics. For the purpose of the development of polymer electrolyte membrane for fuel cell, the PEMs of aromatic hydrocarbon polymers, so-called "super engineering plastics" including poly (ether ether ketone) (PEEK), have useful characteristics such as high mechanical strength, gas barrier property, and radiation resistance. The graft type PEEK PEMs with 10-81 $$mu$$m thicknesses have grafting degree with 90-100% kept high tensile strength of 60 MPa. In addition to the good mechanical property, open circuit voltage in fuel cell test with these PEEK-PEM were shown more than 0.9 V. The obtained PEEK-based polymer electrolyte membranes with about 12 $$mu$$m thickness showed higher power density than that of Nafion in fuel cell test.

Oral presentation

Alkaline durable 2-methyl-1-vinylimidazolium-based anion exchange membranes prepared by radiation-induced grafting for hydrazine hydrate fuel cells

Yoshimura, Kimio; Koshikawa, Hiroshi; Yamaki, Tetsuya; Shishitani, Hideyuki*; Yamaguchi, Susumu*; Tanaka, Hirohisa*; Maekawa, Yasunari

no journal, , 

Since anion-conducting electrolyte membrane fuel cells (AEMFCs) such as direct hydrazine fuel cells operated under high temperature and highly basic condition, it is required to develop alkaline durable AEMs. In this work, we synthesized AEM with poly 2-methyl-1-vinylimidazolium grafts by radiation-induced graft coplymerizaiton to protect 2-position of imidazolium ring from alkaline hydroxide ion attack. The AEM with an ion-exchange capacity (IEC) of 1.80 mmol g$$^{-1}$$ exhibited ionic conductivity of 123 mS cm$$^{-1}$$ at 60$$^{circ}$$C. The durability of the membrane was evaluated. The excellent long-term alkaline stability of the prepared AEM was confirmed in 1M KOH at 80$$^{circ}$$C. Therefore, the protection of 2-position by methyl group suppresses ring opening degradation reactions, resulting in the improvement of the alkaline durability of imidazolium-type AEMs.

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