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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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Significant Improvement of LiNi0.8Co0.15Al0.05O2 Cathodes at 60 degrees C by SiO2 Dry Coating for Li-Ion Batteries

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Title
Significant Improvement of LiNi0.8Co0.15Al0.05O2 Cathodes at 60 degrees C by SiO2 Dry Coating for Li-Ion Batteries
Author
Cho, YonghyunCho, Jaephil
Keywords
Capacity improvement; Cathode powders; Coated cathodes; Coated sample; Coulombic efficiency; Cycling performance; Discharge capacities; Dry Coating; First discharge; Li-ion batteries; Side reactions; Weight ratios
Issue Date
2010
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.157, no.6, pp.A625 - A629
Abstract
The cycling performance of a LiNi0.8Co0.15Al0.05O2 cathode at 60 degrees C was substantially improved by direct SiO2 dry coating. The SiO2-coated cathode was obtained from firing of the mixture consisting of SiO2 nanoparticles and the cathode powders with a weight ratio of 99:1 at 700 degrees C for 5 h. The first discharge capacity of the coated cathode was 172 mAh/g, whereas the uncoated one showed 182 mAh/g at 60 degrees C. However, the coulombic efficiency of the coated sample was 95%, which was 2% higher than that of the uncoated sample. Moreover, the discharge capacities of the coated cathode at 60 degrees C was about 2.5 times larger than those of the uncoated sample at rates of 0.5 and 1C, showing 146 and 109 mA/g, respectively. This capacity improvement at 60 degrees C is related to the fact that the highly distributed Si element near the surface, as a type of solid solution with LiNi0.8Co0.15Al0.05O2, diminishes the side reactions of the cathode and electrolyte at 60 degrees C.
URI
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DOI
http://dx.doi.org/10.1149/1.3363852
ISSN
0013-4651
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ECHE_Journal Papers

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