Improved ionic conductivity of nitrile rubber/ionic liquid composites

Abstract Polymer electrolytes with high ionic conductivity and good elasticity were prepared by mixing nitrile rubber (poly(acrylonitrile-co-butadiene) rubber; NBR) with ionic liquid, N -ethylimidazolium bis(trifluoromethanesulfonyl)imide (EImTFSI). The NBR/EImTFSI composites were obtained as homogeneous and transparent films when the ionic liquid content was less than 60 wt%. Raman spectroscopy suggested the interaction between nitrile group of NBR and TFSI anion. Sample with ionic liquid content of 50 wt% showed the ionic conductivity of 1.2×10 −5  S cm −1 at 30 °C. Addition of lithium salt to this NBR/EImTFSI composite further enhanced the ionic conductivity to about 10 −4  S cm −1 without spoiling mechanical properties. DSC studies showed two glass transition temperatures for composites indicating microphase separation.

[1]  H. Ohno,et al.  Ionic conductivity of highly deproteinized natural rubber having epoxy group mixed with alkali metal salts , 2004 .

[2]  J. Fuller,et al.  Ionic Liquid‐Polymer Gel Electrolytes , 1997 .

[3]  T. Wen,et al.  Gelled composite electrolyte comprising thermoplastic polyurethane and poly(ethylene oxide) for lithium batteries , 2001 .

[4]  Mustafizur Rahman,et al.  Application of ionic liquids as low-volatility plasticizers for PMMA , 2003 .

[5]  D. Macfarlane,et al.  NMR and Raman studies of a novel fast-ion-conducting polymer-in-salt electrolyte based on LiCF3SO3 and PAN , 2000 .

[6]  H. Ohno,et al.  Design of New Ionic Liquids by Neutralization of Imidazole Derivatives with Imide-Type Acids , 2001 .

[7]  B. Scrosati,et al.  Polymer Electrolytes: The Key to Lithium Polymer Batteries , 2000 .

[8]  M. Watanabe,et al.  Conductivity study on ionic liquid/polymer complexes , 1996 .

[9]  D. Macfarlane,et al.  N-methyl-N-alkylpyrrolidinium tetrafluoroborate salts : ionic solvents and solid electrolytes , 2001 .

[10]  D. Fauteux.  Formation of a passivating film at the lithium-PEO-LiCF3SO3 interface , 1985 .

[11]  H. Ohno,et al.  Preparation and characteristics of natural rubber/poly(ethylene oxide) salt hybrid mixtures as novel polymer electrolytes , 2000 .

[12]  A. Cooper,et al.  Cross-Linked Polymer-Ionic Liquid Composite Materials , 2003 .

[13]  J. Mays,et al.  Application of ionic liquids as plasticizers for poly(methyl methacrylate). , 2002, Chemical communications.

[14]  Masayoshi Watanabe,et al.  Highly conductive polymer electrolytes prepared by in situ polymerization of vinyl monomers in room temperature molten salts , 2000 .

[15]  J. Fuller,et al.  Ionic liquid–polymer gel electrolytes from hydrophilic and hydrophobic ionic liquids , 1998 .

[16]  Kazuhiko Matsumoto,et al.  A highly conductive composite electrolyte consisting of polymer and room temperature molten fluorohydrogenates , 2002 .

[17]  Shiro Nishi,et al.  Dual-phase polymer electrolyte with enhanced mechanical strength , 1999 .

[18]  Liquan Chen,et al.  Study on roles of polyacrylonitrile in “salt-in-polymer” and “polymer-in-salt” electrolytes , 2002 .

[19]  M. Ishikawa,et al.  Ionic conductance of gel electrolyte using a polyurethane matrix for rechargeable lithium batteries , 2004 .

[20]  H. Ohno,et al.  Preparation of Novel Room‐Temperature Molten Salts by Neutralization of Amines , 2000 .