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Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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Edge-Exfoliated Graphites for Facile Kinetics of Delithiation

Cited 6 times inthomson ciCited 4 times inthomson ci
Title
Edge-Exfoliated Graphites for Facile Kinetics of Delithiation
Author
Park, Jeong-SeokLee, Myeong-HeeJeon, In-YupPark, Han-SaemBaek, Jong-BeomSong, Hyun-Kon
Keywords
Anode material; Charge and discharge; D-spacing; De-lithiation; Discharge rates; Edge region; Electrode material; Energy density; Functionalizations; High rate; Interlayer spaces; Interlayer spacings; Lithiation; Lithium ions; Lithium-ion battery; Power densities; Rate capabilities; Rate determining step; Transition-metal oxides
Issue Date
201212
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.6, no.12, pp.10770 - 10775
Abstract
As high rate charge and discharge characteristics of energy storage devices become more important with the market of electric vehicles intensively growing, the kinetics of lithiation or delithiation of electrode materials for lithium ion batteries require enhancement. Graphites, the most widely used anode materials, have a limited power density at high discharge rates, while their alternatives, such as silicon and transition metal oxides, show even inferior rate capability. This work was motivated from an idea of what if the edge opening of graphite was zipped more open to lithium ions in the electrolyte. By edge-selective functionalization, the peripheral d-spacing of graphite (d(0)) was locally controlled. Larger values of d(0) led to higher capacity especially at high discharge rates. Around 2-fold enhancement of capacity or energy density was achieved at 50C discharge rate from 110 to 190 mAh g(-1) by exfoliating graphite locally in its edge region. Also, the do dependency of delithiation kinetics confirmed that the electrochemical step of Li+ influx into or efflux out of the interlayer space of graphite is possibly the rate-determining step of lithiation or delithiation.
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DOI
http://dx.doi.org/10.1021/nn3050227
ISSN
1936-0851
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