Effects of ZnO Coating on Electrochemical Performance and Thermal Stability of LiCoO2 as Cathode Material for Lithium-Ion Batteries

Title
Effects of ZnO Coating on Electrochemical Performance and Thermal Stability of LiCoO2 as Cathode Material for Lithium-Ion Batteries
Authors
장원영최정우임종주이중기
Keywords
lithium-ion batteries; capacity retention; thermal stability; surface coating; Cathode materials; Zinc oxide coating; Plasma-enhanced chemical vapour; deposition
Issue Date
2010-01
Publisher
Journal of power sources
Citation
VOL 195, NO 1, 320-326
Abstract
ZnO-coated LiCoO2 particles are prepared by plasma-enhanced chemical vapour deposition (PE-CVD) in a coating range from0.08 to 0.49 wt.%, and examined using field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and atomic absorption spectroscopy (AAS), with particular focus on surface characteristics. From charge-discharge cycling tests in the range of 3.0–4.5 V, the ZnO coating has little effect on the discharge capacity in the first few cycles, but the coating effectively improves the capacity retention after prolonged cycling. In the experimental range studied, the optimum amount of ZnO coating which maximizes the capacity retention is found to be 0.21 wt.%. An excessive amount of ZnO coating causes a decrease in both cyclic performance and thermal stability. The possible reasons for enhanced cycleability and thermal stability afforded by the ZnO coating are discussed fromthe viewpoint of the surface morphology of the bare and coated LiCoO2 particles and their impedance spectra.
URI
http://pubs.kist.re.kr/handle/201004/37117
ISSN
0378-7753
Appears in Collections:
KIST Publication > Article
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