Polymerized ionic liquid diblock copolymer as solid-state electrolyte and separator in lithium-ion battery

POLYMER

卷:101

Article

Nykaza, Jacob R.¹  Savage, Alice M.²  Pan, Qiwei³  Wang, Shijun³  Beyer, Frederick L.²  Tang, Maureen H.¹  Li, Christopher Y.³  Elabd, Yossef A.⁴ 

[1] Drexel Univ, Dept Chem & Biol Engn, Philadelphia, PA 19104 USA

[2] Army Res Lab, Aberdeen Proving Ground, MD 21005 USA

[3] Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

[4] Texas A&M Univ, Dept Chem Engn, College Stn, TX 77843 USA

关键词: Ionic liquid;    Block copolymer;    Membrane;   

DOI  :  10.1016/j.polymer.2016.08.100

来源: Elsevier

【 摘 要 】

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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