An enhanced electrochemical and cycling properties of novel boronic Ionic liquid based ternary gel polymer electrolytes for rechargeable Li/LiCoO2 cells

K Karuppasamy; Hyun-Seok Kim; Dongkyu Kim; Dhanasekaran Vikraman; K Prasanna; A Kathalingam; Ramakant Sharma; Hee Woo Rhee

doi:10.1038/s41598-017-11614-1

An enhanced electrochemical and cycling properties of novel boronic Ionic liquid based ternary gel polymer electrolytes for rechargeable Li/LiCoO₂ cells

Sci Rep. 2017 Sep 11;7(1):11103. doi: 10.1038/s41598-017-11614-1.

Authors

K Karuppasamy¹, Hyun-Seok Kim², Dongkyu Kim³, Dhanasekaran Vikraman⁴, K Prasanna⁵, A Kathalingam⁶, Ramakant Sharma⁷, Hee Woo Rhee⁸

Affiliations

¹ Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul, 04620, South Korea. karuppasamyiitb@gmail.com.
² Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul, 04620, South Korea. hyunseokk@dongguk.edu.
³ Polymer Materials Lab, Department of Chemical and Biomolecular Engineering, Sogang University, 35 Baekbeom-ro,Mapo-gu, Seoul, 04107, South Korea.
⁴ Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul, 04620, South Korea.
⁵ Electrochemical Energy Storage and Conversion Lab (EESC), Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin, Gyeonggi, 17104, South Korea.
⁶ Millimeter-wave Innovation Technology (MINT) Research Center, Dongguk University-Seoul, Seoul, 04620, South Korea.
⁷ Plastic Electronics and Energy Laboratory, Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, 400 076, Maharastra, India.
⁸ Polymer Materials Lab, Department of Chemical and Biomolecular Engineering, Sogang University, 35 Baekbeom-ro,Mapo-gu, Seoul, 04107, South Korea. hwrhee@sogang.ac.kr.

Abstract

A new generation of boronic ionic liquid namely 1-ethyl-3-methylimidazolium difluoro(oxalate)borate (EMImDFOB) was synthesized by metathesis reaction between 1-ethyl-3-methylimiazolium bromide and lithium difluoro(oxalate)borate (LiDFOB). Ternary gel polymer electrolyte membranes were prepared using electrolyte mixture EMImDFOB/LiDFOB with poly vinylidenefluoride-co-hexafluoropropylene (PVdF-co-HFP) as a host matrix by facile solvent-casting method and plausibly demonstrated its feasibility to use in lithium ion batteries. Amongst ternary gel electrolyte membrane, DFOB-GPE3, which contained 80 wt% of EMImDFOB/LiDFOB and 20 wt% PVdF-co-HFP, showed excellent electrochemical and cycling behaviors. The highest ionic conductivity was found to be 10^-3 Scm^-1 at 378 K. Charge-discharge profile of Li/DFOB-GPE3/LiCoO₂ coin cell displayed a maximum discharge capacity of 148.4 mAhg^-1 at C/10 rate with impressive capacity retention capability and columbic efficiency at 298 K.

Publication types

Research Support, Non-U.S. Gov't