Electrochemical and structural properties of lithium battery anode materials by using a molecular weight controlled pitch derived from petroleum residue

The petroleum pitch derived from pyrolyzed fuel oil (PFO) was prepared and modified using the solvent extraction method to study the effect of the pitch fraction on electrochemical and structural behaviors. The modified pitches were Hexane-insoluble, Toluene-insoluble and NMP-insoluble pitches. To confirm the structural characteristic parameters such as (L-a, d(002), I-G/I-D and true density), X-ray diffraction, Raman spectroscopy and true density measurements were conducted. Electrochemical properties were measured using the coin cell test. Based on the electrochemical properties and structural analyses, the schematic design of the micro-carbon domain was proposed, and the role of each fraction (hexane soluble, hexane-soluble and toluene-insoluble, Toluene-insoluble and NMPI-insoluble and NMPI fractions) was studied. Each fraction affected the coke during carbonization, and the hexane-soluble fraction and hexane-soluble and toluene-insoluble fraction affected the initial efficiency and Li+ ion diffusion resistance. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.