Lithium ion (Li-ion) rechargeable batteries fulfill many of the demands made within the areas of portable electronics and EV/HEV's and have been used for popular power sources in portable electronic device using electrolytes ranging from traditional liquid electrolytes to currently used polymer electrolytes for safe and stable operation. It is widely known that there is theoretical limit in ionic conductivity of solid polymer electrolytes like PEO, PVA and PAN derivatives which are still collecting attention today but the use of low molecular weight electrolytes is yet to be explored. In order to exceed the expected limitation, there is an urgent need to seek for another ion conductive mechanism different from ordinary polymer electrolytes. In the present work, we have prepared novel low molecular weight solid organoboron electrolyte and studied its ion-transport behavior. The dehydrocoupling reaction between mesitylboraneand dehydrated ethylene glycol at room temperature for 5 hours gave crystalline needle shaped compound 1  (Scheme 1) which is characterized by 11B-NMR, 1H-NMR, HRTEM, RAMAN and TGA. To study the ion transport behavior, 1  was doped with LiTFSI by grinding in different molar ratios resulting in soft solid. The highest ionic conductivity was observed for the sample with molar ratio 1 : LiTFSI=4:1 . Under low amount of Li salt, Arrhenius plot showed linear profile while curved profiles were observed under rich amount of Li salt which indicated that ion conductive mechanism is different depending on the amount of Li salt in the present systems. The Li transference number for the systems were studied. The compound showed a potential range of 5.0 V. References(1) Matsumi, N.; Ohno, H. In Macromolecules Containing Metal and Metal-Like Elements: Boron-Containing Polymers; Volume 8; John Wiley & Sons Inc., 2007; pp.175-196.

Ion conductive behavior of low molecular weight solid organoboron electrolyte for lithium ion secondary batteries

247th National Meeting (2014)

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