Highly Conductive and Flexible Gel Polymer Electrolyte with Bis(Fluorosulfonyl)imide Lithium Salt via UV Curing for Li-Ion Batteries
by
Lei Jin 1
, Faiz Ahmed 1, Taewook Ryu 1, Sujin Yoon 1, Wei Zhang 1, Yonghoon Lee 1, Daeho Kim 1, Hohyoun Jang 2 and Whangi Kim 1,*
Lei Jin 1, Faiz Ahmed 1, Taewook Ryu 1, Sujin Yoon 1, Wei Zhang 1, Yonghoon Lee 1, Daeho Kim 1, Hohyoun Jang 2 and Whangi Kim 1,*
1
Department of Applied Chemistry, Konkuk University, 268 Chungwon-daero, Chungju-si 27478, Chungcheongbuk-do, Korea
2
Department of Liberal arts, Konkuk University, 268 Chungwon-daero, Chungju-si 27478, Chungcheongbuk-do, Korea
*
Author to whom correspondence should be addressed.
Membranes 2019, 9(11), 139; https://doi.org/10.3390/membranes9110139
Received: 27 September 2019 / Revised: 24 October 2019 / Accepted: 28 October 2019 / Published: 30 October 2019
(This article belongs to the Section Membrane Preparation and Characterization)
A series of new self-standing gel polymer electrolytes (SGPEs) were fabricated by ultraviolet (UV) curing and investigated for application in flexible lithium-ion batteries. Compared with traditional gel polymer electrolytes (combine with solvents or plasticizers), these new SGPEs were prepared simply by curing different weight ratios of lithium bis(fluorosulfonyl)imide (LiFSI) with a methacrylic linear monomer, poly (ethylene glycol) dimethacrylate (PEGDMA). Noticeably, there were no solvents or plasticizers combined with the final SGPEs. Owing to this, the SGPEs showed high flexibility and strong mechanical stability. Some paramount physicochemical and electrochemical characters were observed. The SGPEs demonstrated good thermal stability below 150 °C and an extremely low glass transition temperature (Tg) (around −75 °C). Moreover, plastic crystal behaviors were also identified in this study. Ultimately, the SGPEs demonstrated excellent ionic conductivity at room temperature, which proves that these new SGPEs could be widely applied as a prospective electrolyte in flexible lithium-ion batteries.
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Keywords:
gel polymer electrolytes; UV curing; lithium bis(fluorosulfonyl)imide; room temperature ionic conductivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
MDPI and ACS Style
Jin, L.; Ahmed, F.; Ryu, T.; Yoon, S.; Zhang, W.; Lee, Y.; Kim, D.; Jang, H.; Kim, W. Highly Conductive and Flexible Gel Polymer Electrolyte with Bis(Fluorosulfonyl)imide Lithium Salt via UV Curing for Li-Ion Batteries. Membranes 2019, 9, 139.
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