Public Lecture by Assoc. Prof. Dr. Yoichi Tominaga

Assalamualaikum wbkt and greetings to you!

Dear Prof/Dr/Sir/Mr/Ms,

We are pleased to invite you to Public Lecture by Assoc. Prof. Dr. Yoichi Tominaga on 25th August 2017. This lecture is proudly organized by School of Chemical Sciences and Food Technology,FST, Universiti Kebangsaan Malaysia (UKM).

The title of this lecture is "Recent Development of Ion-conductive Polymer Electrolytes for Energy Storage Devices". The details of the lecture are as follow:

Date: 25th August 2017 (Friday)

Time: 9.00 am -12.00 pm

Venue: Bilik Mesyuarat FST, Dewan Anwar Mahmud (DAM)

Fee: Free admission

Tentative:

0900-0930:Registration

0930-1030:Public Lecture Dr. Tominaga

1030-1100: Q&A

1100: Refreshment

Synopsis:

Since ionic conduction in novel polymer electrolytes consisting of alternating copolymers of CO2 with glycidyl ethers and LiTFSI was first reported in 2010, we have been focusing on polycarbonates (poly(ethylene carbonate) (PEC) and its derivatives) and studying their unique ion-conductive properties. In this study, we used commercial PEC and many polycarbonates having different side groups synthesized in our laboratory. We found that the conductivity of some PEC-Li salt electrolytes increases with increasing salt concentration and the Li transference numbers (t+) are extremely higher than those of typical polyether system. A PEC-LiFSI composite filled with nano-ordered TiO2 particulates also showed very high t+ more than 0.8, and excellent Li-ion conductivity to be 0.4 mS/cm at 60 oC. On the other hand, we have studied dielectric behavior of PEC-based electrolytes using broadband dielectric spectroscopy, and it was revealed that the mobility of PEC segment at high salt concentration is enhanced by two factors; one is the decrease in intermolecular interactions by the existence of many ion pairs and aggregated ions around saturated PEC domains where the dissociated ions are highly concentrated, and the other is the intramolecular interactions between C=O and CH2 are lowered by the ion-dipole interaction. Moreover, we have demonstrated battery performance of a Li|PEC-LiFSI|LiFePO4 cell and obtained a reversible charge-discharge capacity around 120 mAh/g at 30 oC and C/20 rate.

Background of Speaker:

Dr. Yoichi Tominaga is an Associate Professor at Tokyo University of Agriculture and Technology (TUAT). He was a PhD graduate from Professor Hiroyuki Ohno group in 2000. After graduation, he took up an academic position at Tokyo Institute of Technology in 2000, worked as an Assistant Professor by 2007 and was appointed Lecturer of TUAT in 2007. During the assistant in 2003-2004, he worked with Professor Bruno Scrosati at Rome University as a Research Fellow of Ministry of Education, Culture, Sports, Science and Technology of Japan. He was awarded a SPSJ Hitachi Chemical Award from the Society of Polymer Science, Japan in 2015 to extend his work on polymer electrolytes. His research interests include polymeric and composite materials for batteries, biomass, smart and intelligent devices and medical applications. He has prepared and tested a lithium-ion cell using new polymer electrolytes working at room temperature to develop flexible solid batteries.

We would really appreciate if you could circulate this information among your colleagues that you consider might be interested in joining the lecture.

We are looking forward to meet you in this lecture!

Thank you.

Best Regards,

Comittee,

Public Lecture Assoc. Prof. Dr. Yoichi Tominaga