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A simple preparation method for spherical carbons and their anodic performance in lithium secondary batteries

Cited 22 time in Web of Science Cited 23 time in Scopus
Authors
Kwon, Ou Jung; Jung, Yoon Seok; Kim, Ji Hyun; Oh, Seung M.
Issue Date
2003-10-14
Publisher
Elsevier
Citation
J. Power Sources 125 (2004) 221
Keywords
Lithium secondary batteriesSpherical carbonsHard carbonsGraphitic carbonsMesophase pitches
Abstract
This work reports a simple preparation method for spherical hard carbons and graphites. The phenolic resin and methylnaphthalene-derived mesophase pitch (MNMP) powders are employed as the precursor for hard carbon and graphite, respectively. The irregular-shaped precursor powders are converted to spherical carbons by first coating with fine-grained fumed silica powder and carbonizing/graphitizing under an argon atmosphere. Two characteristic features are observed in this preparation. First, among the used silica powders, only those having a hydrophobic surface group are effective for the irregular to sphere conversion. Second, the conversion takes place near the glass transition temperature of the resin and the softening point of the pitch, respectively. Based on these observations, an irregular to sphere conversion mechanism has been proposed. The spherical carbon powders exhibit a higher tap density and smaller surface area than those of the irregular-shaped ones, which is an advantageous feature for practical lithium batteries.
ISSN
0378-7753
Language
English
URI
http://hdl.handle.net/10371/5808
DOI
https://doi.org/10.1016/j.jpowsour.2003.08.012
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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