Journal
POLYMER
Volume 101, Issue -, Pages 311-318Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2016.08.100
Keywords
Ionic liquid; Block copolymer; Membrane
Categories
Funding
- U.S. Army Research Office [W911NF-14-0310]
- Postgraduate Research Participation Program at the US Army Research Laboratory [ORISE1120-1120-99]
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A polymerized ionic liquid diblock copolymer (PILBCP-TFSI), poly(MMA-b-MUBIm-TFSI), consisting of an ionic liquid monomer, (1-[(2-methacryloyloxy)undecyl]-3-butylimidazolium bis(trifluoromethane)sulfonamide) (MUBIm-TFSI), and a non-ionic monomer, methyl methacrylate (MMA), was synthesized via reverse addition fragmentation chain transfer polymerization followed by anion exchange metathesis. Free standing, mechanically stable transparent solid polymer films were produced with PILBCP-TFSI containing 1 M lithium bis(trifluoromethane)sulfonamide in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (Li-TFSI/EMIm-TFSI). The resulting PILBCP-TFSI + Li-TFSI/EMIm-TFSI films possessed ion conductivities from 1 to 10 mS cm(-1) from 25 degrees C to 105 degrees C. Solid-state lithium -ion coin cell batteries were assembled and tested at room temperature with PILBCP-TFSI + Li-TFSI/EMIm-TFSI films as the solid-state electrolyte and separator and resulted in a maximum discharge capacity of 112 mAh g(-1) at 0.1 C with a Coulombic efficiency greater than 94% over 100 cycles. For the first time, these results demonstrate the feasibility of PIL block copolymers as solid-state electrolytes and separators in lithium ion batteries. (C) 2016 Elsevier Ltd. All rights reserved.
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