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Morphology-Dependent Li Storage Performance of Ordered Mesoporous Carbon as Anode Material

Authors
Kim, Min-SikBhattacharjya, DhrubajyotiFang, BaizengYang, Dae-SooBae, Tae-SungYu, Jong-Sung
Issue Date
4-6월-2013
Publisher
AMER CHEMICAL SOC
Keywords
Li ion battery; Mesioporous carbon. Anode; Mesoporous chennels; Rod-like morphology
Citation
LANGMUIR, v.29, no.22, pp.6754 - 6761
Indexed
SCIE
SCOPUS
Journal Title
LANGMUIR
Volume
29
Number
22
Start Page
6754
End Page
6761
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/102989
DOI
10.1021/la401150t
ISSN
0743-7463
Abstract
Rod-shaped ordered mesoporous carbons (OMCs) with different lengths, prepared by replication method using the corresponding size-tunable SBA-15 silicas with the same rodlike morphology as templates, are explored as anode material for Li-ion battery. All of the as-synthesized OMCs exhibit much higher Li storage capacity and better cyclability along with comparable rate capability as compared with commercial graphite: Particularly, the OMC-3 with the shortest length demonstrates the highest reversible discharge capacity of 1012 mAh g(-1), at 100 mA g(-1) and better cyclability with 86.6% retention of initial capacity after 100 cycles. Although the Coulombic efficiencies of all the OMCs are relatively low at the beginning, they improve promptly and after 10 cycles reach the level comparable to commercial graphite. Based on their specific capacity, cycle efficiency, and rate capability, the OMC-3 outperforms considerably its carbon peers, OMC-1 and OMC-2 with longer length This behavior is mainly attributed to higher specific surface area, which provides more active sites for Li adsorption and storage along with the larger mesopore volume and shorter performance with decrease mesopore channels, which facilitate fast Li ion diffusion and electrolyte transport. The enhancement in reversible Li in the channel length is also supported by low solid electrolyte interphase resistance, contact resistance, and Warburg impedance in electrochemical impedance spectroscopy.
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