The carbon anode material for lithium-ion battery was prepared by pyrolysis fuel oil and waste polyethylene terephthalate (PET) additive. The pitch was synthesized as a medium material for carbon anode by heat treatment. The waste PET additive improved the softening point and thermal stability of the pitch. La and Lc of the anode material (heat-treated pitch) increased at higher treatment temperature but decreased by waste PET additive. The electric capacity was evaluated based on effects of defective cavity and developed graphite interlayer, respectively. When the La and Lc of the anode material decreased, the electric capacity by cavity increased based on defective graphite structure. Therefore, the addition of waste PET causes the improved capacity by the cavity. The anode material which has a high efficiency (over 95%) and C-rate (95%, 2 C/0.1 C) was obtained by controlling the process of heat treatment and PET addition. The mechanism of lithium-ion insertion was discussed based on effects of defective cavity and developed graphite interlayer.

    Abstract
    1 Introduction
    2 Experimental methods and analysis
        2.1 The synthesis of pitch from PFO and waste PET
        2.2 Preparation and analysis of anode materials according to thermal treatment temperature
        2.3 Assembly and electrochemical analysis of lithium-ion battery
    3 Results and discussion
        3.1 Pitch synthesis and analysis according to PET addition
        3.2 Crystallinity analysis with respect to heat treatment temperature
        3.3 Electrochemical analysis
    4 Conclusions
    Acknowledgements 
    References

• Kyung Soo Kim(Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT), Department of Chemical Engineering, Chungbuk National University)
• Jin Ung Hwang(Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT), Department of Chemical Engineering, Chungbuk National University)
• Ji Sun Im(Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT), Advanced Materials and Chemical Engineering, University of Science and Technology (UST))
• Jong Dae Lee(Department of Chemical Engineering, Chungbuk National University)
• Ji Hong Kim(Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT), Department of Chemical and Biological Engineering, Korea University)
• Min Il Kim(Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT))