Effects of ZnO Coating on Electrochemical Performance and Thermal Stability of LiCoO2 as Cathode Material for Lithium-Ion Batteries
- Effects of ZnO Coating on Electrochemical Performance and Thermal Stability of LiCoO2 as Cathode Material for Lithium-Ion Batteries
- 장원영; 최정우; 임종주; 이중기
- lithium-ion batteries; capacity retention; thermal stability; surface coating; Cathode materials; Zinc oxide coating; Plasma-enhanced chemical vapour; deposition
- Issue Date
- Journal of power sources
- VOL 195, NO 1, 320-326
- 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.
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