Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 5, Pages 1696-1700Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.10.051
Keywords
Biomass-derived carbon; Charcoal; Carbonization; Nuclear magnetic resonance; Electrochemical properties
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In this study, the microstructure of mangrove-charcoal-derived carbon (MC) was studied using XRD, STM and TEM. MC was found to consist of aligned quasi-spherical structural units with diameters of around 5-20 nm. It shows typical hard carbon characteristics, including a strongly disoriented single graphene layer and BSU, formed by two or three graphene layers stacked nearly parallel. Some curved and faceted graphene layers, especially closed carbon nanoparticles with fullerene-like, were observed in the as-prepared samples. MC was also evaluated as an anodic material for Li-ion batteries. MC carbonized at 1000 degrees C possessed the highest available discharge capacity (below 0.5V) of 335 mAh g(-1), the high first-cycle coulombic efficiency of 73.7%, good rate and cyclic capability and PC-based electrolyte compatibility. Li-7 nuclear magnetic resonance (NMR) spectra of fully lithiated mangrove charcoal-derived carbons indicated the co-existence of three Li species. (C) 2009 Elsevier Ltd. All rights reserved.
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