Enhanced electrochemical performance of graphene modified LiFePO$_{4}$ as a cathode material for lithium ion batteries

POSTER

Abstract

We have synthesized LiFePO$_{4}$/graphene nano-composites using a sol-gel method by adding water dispersed graphene oxide to the LiFePO$_{4}$ precursors during the synthesis. The graphene oxide was reduced by annealing the composite at 600$^{\circ}$C for 5h in flowing forming gas (90{\%} Ar and 10{\%} H$_{2})$. The phase purity of the product was characterized by X-Ray diffraction and Raman spectroscopy. The reduction of graphene oxide was verified by Raman spectroscopy and X-ray Photoelectron spectroscopy. The electronic conductivity of LiFePO$_{4}$/graphene composite was found to be six orders of magnitude higher than that of pure LiFePO$_{4}$ synthesized following otherwise the same procedure except that no graphene oxide was added. SEM and TEM images show that LiFePO$_{4}$ particles are wrapped in uniformly distributed graphene sheets throughout the material forming a three dimensional conducting network. At low currents, the capacity of the composite cathode reaches 160 mAh/g, which is very close to the theoretical limit. More significantly, the graphene wrapped LiFePO$_{4}$ shows a dramatically improved rate capability and excellent charge-discharge cycle stability in comparison with the LiFePO$_{4}$ without graphene.

Authors

  • K.S. Dhindsa

    Wayne State University

  • Oleg Popov

    Miami University, Chemistry Department, Penn State Univ., University Park, PA 16802, unaffiliated, Department of Materials Science and Engineering, Ohio State University Columbus, OH 43210, Department of Physics, Ohio State University, Columbus, OH 43210, Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, Korea Institute of Science and Technology, University of Cincinnati, Miami University of Ohio, University of Michigan, University of Notre Dame, University of Nebraska-Lincoln, Wayne State University, University of Tennessee, National Technical University of Athens, The University of Tennessee, Kettering Univeristy, University of Michigan-Dearborn, FNAL, Harvard University, California State University, Department of Physics, Kettering University, Flint, Michigan, Department of Natural Sciences, University of Michigan-Dearborn, Applied Sciences Inc., Cedarville, Ohio, Oakland University, University of Stockholm, Arizona State University

  • Oleg Popov

    Miami University, Chemistry Department, Penn State Univ., University Park, PA 16802, unaffiliated, Department of Materials Science and Engineering, Ohio State University Columbus, OH 43210, Department of Physics, Ohio State University, Columbus, OH 43210, Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, Korea Institute of Science and Technology, University of Cincinnati, Miami University of Ohio, University of Michigan, University of Notre Dame, University of Nebraska-Lincoln, Wayne State University, University of Tennessee, National Technical University of Athens, The University of Tennessee, Kettering Univeristy, University of Michigan-Dearborn, FNAL, Harvard University, California State University, Department of Physics, Kettering University, Flint, Michigan, Department of Natural Sciences, University of Michigan-Dearborn, Applied Sciences Inc., Cedarville, Ohio, Oakland University, University of Stockholm, Arizona State University

  • Oleg Popov

    Miami University, Chemistry Department, Penn State Univ., University Park, PA 16802, unaffiliated, Department of Materials Science and Engineering, Ohio State University Columbus, OH 43210, Department of Physics, Ohio State University, Columbus, OH 43210, Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, Korea Institute of Science and Technology, University of Cincinnati, Miami University of Ohio, University of Michigan, University of Notre Dame, University of Nebraska-Lincoln, Wayne State University, University of Tennessee, National Technical University of Athens, The University of Tennessee, Kettering Univeristy, University of Michigan-Dearborn, FNAL, Harvard University, California State University, Department of Physics, Kettering University, Flint, Michigan, Department of Natural Sciences, University of Michigan-Dearborn, Applied Sciences Inc., Cedarville, Ohio, Oakland University, University of Stockholm, Arizona State University

  • Oleg Popov

    Miami University, Chemistry Department, Penn State Univ., University Park, PA 16802, unaffiliated, Department of Materials Science and Engineering, Ohio State University Columbus, OH 43210, Department of Physics, Ohio State University, Columbus, OH 43210, Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, Korea Institute of Science and Technology, University of Cincinnati, Miami University of Ohio, University of Michigan, University of Notre Dame, University of Nebraska-Lincoln, Wayne State University, University of Tennessee, National Technical University of Athens, The University of Tennessee, Kettering Univeristy, University of Michigan-Dearborn, FNAL, Harvard University, California State University, Department of Physics, Kettering University, Flint, Michigan, Department of Natural Sciences, University of Michigan-Dearborn, Applied Sciences Inc., Cedarville, Ohio, Oakland University, University of Stockholm, Arizona State University

  • Oleg Popov

    Miami University, Chemistry Department, Penn State Univ., University Park, PA 16802, unaffiliated, Department of Materials Science and Engineering, Ohio State University Columbus, OH 43210, Department of Physics, Ohio State University, Columbus, OH 43210, Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, Korea Institute of Science and Technology, University of Cincinnati, Miami University of Ohio, University of Michigan, University of Notre Dame, University of Nebraska-Lincoln, Wayne State University, University of Tennessee, National Technical University of Athens, The University of Tennessee, Kettering Univeristy, University of Michigan-Dearborn, FNAL, Harvard University, California State University, Department of Physics, Kettering University, Flint, Michigan, Department of Natural Sciences, University of Michigan-Dearborn, Applied Sciences Inc., Cedarville, Ohio, Oakland University, University of Stockholm, Arizona State University

  • Oleg Popov

    Miami University, Chemistry Department, Penn State Univ., University Park, PA 16802, unaffiliated, Department of Materials Science and Engineering, Ohio State University Columbus, OH 43210, Department of Physics, Ohio State University, Columbus, OH 43210, Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, Korea Institute of Science and Technology, University of Cincinnati, Miami University of Ohio, University of Michigan, University of Notre Dame, University of Nebraska-Lincoln, Wayne State University, University of Tennessee, National Technical University of Athens, The University of Tennessee, Kettering Univeristy, University of Michigan-Dearborn, FNAL, Harvard University, California State University, Department of Physics, Kettering University, Flint, Michigan, Department of Natural Sciences, University of Michigan-Dearborn, Applied Sciences Inc., Cedarville, Ohio, Oakland University, University of Stockholm, Arizona State University

  • Oleg Popov

    Miami University, Chemistry Department, Penn State Univ., University Park, PA 16802, unaffiliated, Department of Materials Science and Engineering, Ohio State University Columbus, OH 43210, Department of Physics, Ohio State University, Columbus, OH 43210, Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, Korea Institute of Science and Technology, University of Cincinnati, Miami University of Ohio, University of Michigan, University of Notre Dame, University of Nebraska-Lincoln, Wayne State University, University of Tennessee, National Technical University of Athens, The University of Tennessee, Kettering Univeristy, University of Michigan-Dearborn, FNAL, Harvard University, California State University, Department of Physics, Kettering University, Flint, Michigan, Department of Natural Sciences, University of Michigan-Dearborn, Applied Sciences Inc., Cedarville, Ohio, Oakland University, University of Stockholm, Arizona State University

  • Oleg Popov

    Miami University, Chemistry Department, Penn State Univ., University Park, PA 16802, unaffiliated, Department of Materials Science and Engineering, Ohio State University Columbus, OH 43210, Department of Physics, Ohio State University, Columbus, OH 43210, Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, Korea Institute of Science and Technology, University of Cincinnati, Miami University of Ohio, University of Michigan, University of Notre Dame, University of Nebraska-Lincoln, Wayne State University, University of Tennessee, National Technical University of Athens, The University of Tennessee, Kettering Univeristy, University of Michigan-Dearborn, FNAL, Harvard University, California State University, Department of Physics, Kettering University, Flint, Michigan, Department of Natural Sciences, University of Michigan-Dearborn, Applied Sciences Inc., Cedarville, Ohio, Oakland University, University of Stockholm, Arizona State University