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Jung, Yoon Seok
Electrochemical Solid-State Energy Storage Lab
Research Interests
  • Batteries, All-solid-state batteries, solid electrolytes, electrodes, atomic layer deposition,energy storage devices

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

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Title
A simple preparation method for spherical carbons and their anodic performance in lithium secondary batteries
Author
Kwon, OJJung, Yoon SeokKim, JHOh, SM
Keywords
Graphitic carbons; Hard carbons; Lithium secondary batteries; Mesophase pitches; Spherical carbons
Issue Date
2004-01
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.125, no.2, pp.221 - 227
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.
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DOI
10.1016/j.jpowsour.2003.08.012
ISSN
0378-7753
Appears in Collections:
ECHE_Journal Papers
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