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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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Improvement of structural stability of LiCoO2 cathode during electrochemical cycling by sol-gel coating of SnO2

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Title
Improvement of structural stability of LiCoO2 cathode during electrochemical cycling by sol-gel coating of SnO2
Author
Cho, JaephilKim, CSYoo, SI
Keywords
LITHIUM; R(3)OVER-BAR-M; INTERCALATION; DIFFRACTION; OXIDE; CELL
Issue Date
200008
Publisher
ELECTROCHEMICAL SOC INC
Citation
ELECTROCHEMICAL AND SOLID STATE LETTERS, v.3, no.8, pp.362 - 365
Abstract
We report that sol-gel coating of SnO2 and subsequent heat-treatment at relatively low temperature greatly improve the structural stability of LiCoO2 cathodes. Coated LiCoO2 materials heat-treated at 400 and 500 degrees C exhibit excellent structural stability, retaining 86 and 84%, respectively, of their initial capacities after 47 cycles between 4.4 and 2.75 V at the 0.5 C rate. This is attributed to the disappearance of the transition to a hexagonal phase from a monoclinic phase at 4.15-4.2 V during cycling, a result of the formation of nonuniform Sn distribution throughout the particle, i.e., higher Sn concentration near the particle surface. In contrast, coated LiCoO2 heat-treated at 600 degrees C that shows uniform Sn distribution throughout the particles exhibits this phase transition during cycling, as does uncoated LiCoO2, leading to 51% capacity loss after 47 cycles. This phase transition also increases cation disorder upon cycling.
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DOI
http://dx.doi.org/10.1149/1.1391149
ISSN
1099-0062
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