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Author

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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Controlled nanoparticle metal phosphates (metal = Al, Fe, Ce, and Sr) coatings on LiCoO2 cathode materials

Cited 51 times inthomson ciCited 50 times inthomson ci
Title
Controlled nanoparticle metal phosphates (metal = Al, Fe, Ce, and Sr) coatings on LiCoO2 cathode materials
Author
Kim, JisukNoh, MijungCho, JaephilKim, HyunMiKim, Ki-Bum
Keywords
Annealing; Cathodes; Dissolution; Electric discharges; Nanostructured materials; Protective coatings; Thermodynamic stability
Issue Date
2005
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.152, no.6, pp.A1142 - A1148
Abstract
Despite the fact that the same coating concentration and annealing temperature are used for MPO4 nanoparticle coatings (M = Al, Fe, Ce, and SrH) on a LiCoO2 cathode, the extent of the coating coverage is influenced by the nanoparticle size or morphology. Nanoparticles (AlPO 4 or FePO4) with a size smaller than 20 nm led to the complete encapsulation of LiCoO2, but those with sizes greater than 150 nm (CePO4) or with whisker shapes (SrHPO4) led to partial encapsulation. This difference affected the discharge capacity. The LiCoO2 completely encapsulated with AlPO4 or FePO 4 showed the highest discharge capacity of 230 mAh/g at 4.8 and 3 V at a rate of 0.1 C (=18 mA/g), which diminished with decreasing coating coverage in the order of Al ∼ Fe < SrH < Ce < bare cathode. However, the capacity retention during cycling increased in the order of Al > Ce > SrH > Fe > bare cathode. This is consistent with the capacity retention result obtained at 90°C storage for 4 h.
URI
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DOI
http://dx.doi.org/10.1149/1.1896526
ISSN
0013-4651
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ECHE_Journal Papers

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