Electrochemical Characterization of Boron Doped Graphite as Anode Materials for Lithium-Ion Batteries

H. Bakalc─▒, O. Eksik, R. Yavuz, N. Karatepe
Istanbul Technical University,
Turkey

Keywords: lithium ion battery, graphite, Boron

Summary:

Rechargeable lithium ion batteries are currently dominating the field of portable electronics. Considerable attention has been devoted to improving the performance of various insertion materials to meet the requirements of new technologies. Conventional anode materials for Li-ion batteries are based on graphite, which has a theoretical Li storage capacity of 372 mAh/g with the formation of an intercalation compound LiC6. Different forms of carbon-based materials with improved capacities and cycling performances have been widely investigated as an alternative to graphitic anodes. Doping with boron is an interesting approach to enhancing the performance of carbon-based anodes. One prominent phenomenon of boron-doping in carbon materials is that the boron atom can be substitutionally incorporated into graphite layers and its doping brings out remarkable features including enhanced graphitization. In this study, boron-doped graphite powders were prepared with boron in different weight percentages to find out the optimum mixing ratio. The structural and morphological characterizations have been carried out through X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical performances have been analyzed with reference to Li. Boron doped graphite electrodes show the good rate capability and possesses the stable cycling performance even charging and discharging at the large current density.