High-capacity carbons prepared from acrylonitrile-butadiene-styrene terpolymer for use as an anode material in lithium-ion batteries

Carbon materials were synthesized by the pyrolysis of acrylonitrile-butadiene-styrene terpolymer (ABS) under different heat treatment conditions. ABS decomposed in a rapid single-step reaction, which was completed around 600 degreesC. X-ray diffraction studies indicated a disordered carbon structure with a large number of single layer carbon sheets. It was found that varying the soak time, pyrolysis temperature and heating rate greatly affected the compositional, structural and electrochemical characteristics of the carbonaceous products. Charge-discharge studies of the product obtained by a 1 h pyrolysis at 600 degreesC at a heating rate of 20 degreesC/min exhibited first-cycle lithium insertion and deinsertion capacities of 825 and 564 mAh/g, respectively. Subsequent cycles showed a remarkable improvement in cycling efficiency with a 10th cycle efficiency of 100%. (C) 2003 Elsevier Science B.V. All rights reserved.