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

Cited 52 times inthomson ciCited 49 times inthomson ci
Title
Microstructure of LiCoO2 with and without "AIPO(4)" nanoparticle coating: Combined STEM and XPS studies
Author
Appapillai, Anjuli T.Mansour, Azzam N.Cho, JaephilShao-Horn, Yang
Keywords
Coating microstructure; Coating thickness; Surface microstructure
Issue Date
200711
Publisher
AMER CHEMICAL SOC
Citation
CHEMISTRY OF MATERIALS, v.19, no.23, pp.5748 - 5757
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.
URI
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DOI
http://dx.doi.org/10.1021/cm0715390
ISSN
0897-4756
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