Abstract
The electrochemical properties and stability during storage of pristine and AlPO4-coated LiCoO2 thin films were characterized. The wide and smooth surface of the thin film electrode might provide an opportunity for one to observe surface reactions with an electrolyte. The rate capability and cyclic performance of the LiCoO2 thin film were enhanced by AlPO4 surface coating. Based on secondary ion mass spectrometry analysis and scanning electron microscopy images of the surface, it was confirmed that the coating layer was successfully protected from the reactive electrolyte during storage at 90°C. In contrast, the surface of the pristine sample was severely damaged after storage.
Highlights
Since Sony first developed lithium-ion batteries, extensive research has been carried out to obtain enhanced specific capacity, cyclic performance, and stability [1-4]
The coating layer of the coated film was not clearly observed in the scanning electron microscopy [SEM] image, which may have been due to the thin coating thickness
The Al and P elements were confirmed using energy dispersive spectroscopy [EDS] analysis, which implied the existence of an AlPO4 coating layer
Summary
Since Sony first developed lithium-ion batteries, extensive research has been carried out to obtain enhanced specific capacity, cyclic performance, and stability [1-4]. Surface coating of cathode powder is one of the most effective methods for improving the electrochemical property of lithium-ion batteries. The authors prepared an AlPO4-coated LiCoO2 thin film and investigated its electrochemical property.
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