Gel Polymer Electrolytes Containing Anion-Trapping Boron Moieties for Lithium-Ion Battery Applications

Jimin Shim, Ji Su Lee, Jin Hong Lee, Hee Joong Kim, Jong Chan Lee

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Gel polymer electrolytes (GPEs) based on semi-interpenetrating polymer network (IPN) structure for lithium-ion batteries were prepared by mixing boron-containing cross-linker (BC) composed of ethylene oxide (EO) chains, cross-linkable methacrylate group, and anion-trapping boron moiety with poly(vinylidene fluoride) (PVDF) followed by ultraviolet light-induced curing process. Various physical and electrochemical properties of the GPEs were systematically investigated by varying the EO chain length and boron content. Dimensional stability at high temperature without thermal shrinkage, if any, was observed due to the presence of thermally stable PVDF in the GPEs. GPE having 80 wt % of BC and 20 wt % of PVDF exhibited an ionic conductivity of 4.2 mS cm-1 at 30 °C which is 1 order of magnitude larger than that of the liquid electrolyte system containing the commercial Celgard separator (0.4 mS cm-1) owing to the facile electrolyte uptake ability of EO chain and anion-trapping ability of the boron moiety. As a result, the lithium-ion battery cell prepared using the GPE with BC showed an excellent cycle performance at 1.0 C maintaining 87% of capacity during 100 cycles.

Original languageEnglish (US)
Pages (from-to)27740-27752
Number of pages13
JournalACS Applied Materials and Interfaces
Volume8
Issue number41
DOIs
StatePublished - Oct 19 2016

Bibliographical note

Funding Information:
This research was supported by the Technology Innovation Program (Grant No. 10045221) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea).

Publisher Copyright:
© 2016 American Chemical Society.

Keywords

  • boron
  • gel polymer electrolyte
  • lithium transference number
  • lithium-ion battery
  • semi-IPN

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