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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 .


Microstructure of LiCoO2 with and without "AIPO(4)" nanoparticle coating: Combined STEM and XPS studies

DC Field Value Language Appapillai, Anjuli T. ko Mansour, Azzam N. ko Cho, Jaephil ko Shao-Horn, Yang ko 2014-05-19T06:17:28Z - 2014-05-19 ko 2007-11 -
dc.identifier.citation CHEMISTRY OF MATERIALS, v.19, no.23, pp.5748 - 5757 ko
dc.identifier.issn 0897-4756 ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.abstract "AlPO 4"-coated LiCoO 2 was shown to exhibit markedly improved capacity retention relative to bare LiCO 2 upon cycling to 4.7 V, Scanning and transmission electron microscopy imaging showed that the coating thickness of "AlPOV 4"-coated LiCoO 2 varied from ∼ 10 to ∼ 100 nm. Energy-dispersive X-ray mapping revealed that the coating was not single-phase "AlPO 4", rather consisting of P-rich thick regions (∼100 nm) and Al-rich thin regions (∼10 nm). Detailed X-ray photoelectron spectroscopy (XPS) studies of the "AlPO 4"-coated LiCoO 2 in comparison to bare LiCoO 2 and various reference compounds such as Li 2CO 3, Li 3PO 4, and AlPO4 indicate that (1) AlPO 4 is absent on the surface; (2) the surface consisted of Li 3PO 4 and heavily Al substituted LiAl yCo 1-yO 2, which may result from AlPO 4 nanoparticles reacting with bare LiCoO 2 during the coating heat treatment at 700°C; and (3) the amount of surface Li 2CO 3 is markedly reduced in the coated sample relative to the bare LiCoO 2. The existence of Li 3PO 4 in "AlPO 4"-coated LiCoO 2 was confirmed with X-ray powder diffraction. The coating microstructure of "AlPO 4"- coated LICoO 2 is proposed, and the mechanisms of enhancement in the cycling and thermal characteristics by particle surface microstructure are discussed in detail. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher AMER CHEMICAL SOC ko
dc.subject Coating microstructure ko
dc.subject Coating thickness ko
dc.subject Surface microstructure ko
dc.title Microstructure of LiCoO2 with and without "AIPO(4)" nanoparticle coating: Combined STEM and XPS studies ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-36349023258 ko
dc.identifier.wosid 000250803900039 ko
dc.type.rims ART ko
dc.description.wostc 52 *
dc.description.scopustc 49 * 2014-10-18 * 2014-07-12 *
dc.identifier.doi 10.1021/cm0715390 ko
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