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

• Published in: Carbon Letters Vol. 30; no. 5; pp. 545 - 553
• Main Authors: Kim, Kyung Soo, Hwang, Jin Ung, Im, Ji Sun, Lee, Jong Dae, Kim, Ji Hong, Kim, Min Il
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.10.2020; 한국탄소학회; Springer Nature B.V
• Subjects: Anodes; Carbon; Characterization and Evaluation of Materials; Chemistry and Materials Science; Electrode materials; Fuel oils; Graphite; Heat treating; Heat treatment; Heat treatments; Hot pressing; Interlayers; Lithium; Lithium-ion batteries; Materials Engineering; Materials Science; Molecular weight; Nanotechnology; Original Article; Polyethylene terephthalate; Polymerization; Pyrolysis; Rechargeable batteries; Research methodology; Softening points; Temperature; Thermal stability; 자연과학일반; Pitch; PFO; Waste PET; Lithium-ion battery; Anode materials
• ISSN: 1976-4251; 2233-4998
• DOI: 10.1007/s42823-020-00124-2

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. L a and L c 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 L a and L c 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.