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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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General approach for high-power Li-ion batteries: Multiscale lithographic patterning of electrodes

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Title
General approach for high-power Li-ion batteries: Multiscale lithographic patterning of electrodes
Author
Choi, SinhoKim, Tae-HeeLee, Jung-InKim, JieunSong, Hyun-KonPark, Soojin
Issue Date
2014-12
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMSUSCHEM, v.7, no.12, pp.3483 - 3490
Abstract
We demonstrate multiscale patterned electrodes that provide surface-area enhancement and strong adhesion between electrode materials and current collector. The combination of multiscale structured current collector and active materials (anodes and cathodes) enables us to make high-performance Li-ion batteries (LIBs). When LiFePO4 (LFP) cathode and Li4Ti5O12 (LTO) anode materials are combined with patterned current collectors, their electrochemical performances are significantly improved, including a high rate capability (LiFePO4: 100 mAh g-1, Li4Ti5O12: 60 mAh g-1 at 100C rate) and highly stable cycling (LiFePO4: capacity retention of 99.8% after 50 cycles at 10C rate). Moreover, we successfully fabricate full cell system consisting of patterned LFP cathode and patterned LTO anode, exhibiting high-power battery performances [capacity of approximately 70 mAh g-1 during 1000 cycles at 10C rate (corresponding to charging/discharging time of 6 min)]. We extend this idea to Si anode that exhibits a large volume change during lithiation/delithiation process. The patterned Si electrodes show significantly enhanced electrochemical performances, including a high specific capacity (825 mAh g-1) at high rate of 5C and a stable cycling retention (88% after 100 cycle at a 0.1C rate). This simple strategy can be extended to other cathode and anode materials for practical LIB applications.
URI
https://scholarworks.unist.ac.kr/handle/201301/9485
DOI
10.1002/cssc.201402448
ISSN
1864-5631
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