Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Mixed Electrolytes of Organic Solvents and Ionic Liquid for Rechargeable Lithium-Ion Batteries

  • Choi, Ji-Ae (Department of Chemical Engineering, Hanyang University) ;
  • Shim, Eun-Gi (Electrolyte Development Team, Techno SemiChem Co. Ltd.) ;
  • Scrosati, Bruno (Department of Chemical Engineering, Hanyang University) ;
  • Kim, Dong-Won (Department of Chemical Engineering, Hanyang University)
  • Received : 2010.05.26
  • Accepted : 2010.09.06
  • Published : 2010.11.20
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Abstract

Mixed electrolytes formed by the combination of 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (BMP-TFSI) ionic liquid and standard liquid electrolyte are prepared and characterized. Linear sweep voltammetry measurements demonstrate that these mixed systems exhibit a wide electrochemical stability window, allowing them to be suitable electrolyte for carbonaceous anode-based lithium-ion batteries. Lithium-ion cells composed of graphite anode and $LiCoO_2$ cathode are assembled using the mixed electrolytes, and their cycling performances are evaluated. The cell containing proper content of BMP-TFSI shows good cycling performance comparable to that of a cell assembled with organic electrolyte. The presence of BMP-TFSI in the mixed electrolyte contributes to the reduction of the flammability of electrolyte solution and the improvement of the thermal stability of charged $Li_{1-x}CoO_2$ in the electrolyte solution.

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