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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Li-0.93[Li0.21Co0.28Mn0.51]O-2 nanoparticles for lithium battery cathode material made by cationic exchange from K-birnessite

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Title
Li-0.93[Li0.21Co0.28Mn0.51]O-2 nanoparticles for lithium battery cathode material made by cationic exchange from K-birnessite
Author
Kim, YoojinHong, YoungsikKim, Min GyuCho, Jaephil
Keywords
Cationic exchange; Hydrothermal reaction; K-birnessite; Layered structure; Nanoparticles; Rate performance
Issue Date
200705
Publisher
ELSEVIER SCIENCE INC
Citation
ELECTROCHEMISTRY COMMUNICATIONS, v.9, no.5, pp.1041 - 1046
Abstract
Li0.93[Li0.21Co0.28Mn 0.51]O2 nanoparticles with an R-3m space group is hydrothermally prepared from Co0.35Mn0.65O2 obtained from an ion-exchange reaction with K-birnessite K0.32MnO2 at 200 °C. Even at a hydrothermal reaction temperature of 150 °C, the spinel (Fd3m) phase is dominant, and a layered phase became dominant by combining an increase in the temperature to 200 °C with an increase in lithium concentration. The as-prepared cathode particle has plate-like hexagonal morphology with a size of 100 nm and thickness of 20 nm. The first discharge capacity of the cathode is 258 mAh/g with an irreversible capacity ratio of 22%, and the capacity retention after 30 cycles is 95% without developing a plateau at ∼3 V. Capacity retention of the cathode discharge is 84% at 4C rate (=1000 mA/g) and shows full capacity recovery when decreasing the C rate to 0.1 C.
URI
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DOI
http://dx.doi.org/10.1016/j.elecom.2006.12.020
ISSN
1388-2481
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