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The effect of waste PET addition on PFO-based anode materials for improving the electric capacity in lithium-ion battery

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2020, 30(5), pp.545-553
  • DOI : 10.1007/s42823-020-00124-2
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : August 12, 2019
  • Accepted : February 17, 2020
  • Published : October 1, 2020

Kim Kyung Soo 1 Hwang Jin Ung 1 Im Ji Sun 1 Lee, Jong Dae 2 Kim Ji Hong 1 Kim Min Il 1

1한국화학연구원
2충북대학교

Accredited

ABSTRACT

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 efects 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 efciency (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 efects of defective cavity and developed graphite interlayer.

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