Abstract
The electrochemical properties of fluoride-coated lithium cobalt oxide [LiCoO2] thin films were characterized. Aluminum fluoride [AlF3] and lanthanum fluoride [LaF3] coating layers were fabricated on a pristine LiCoO2 thin film by using a spin-coating process. The AlF3- and LaF3-coated films exhibited a higher rate capability, cyclic performance, and stability at high temperature than the pristine film. This indicates that the AlF3 and LaF3 layers effectively protected the surface of the pristine LiCoO2 film from the reactive electrolyte.
Highlights
Lithium-ion batteries are used as power sources for a wide range of applications such as cellular phones, personal digital assistants [PDAs], laptop computers, and electric vehicles
We focused on the discharge capacity, rate capability, and cyclic performance of the pristine fluoride-coated LiCoO2 thin films to characterize the coating effect
The surface of the pristine LiCoO2 film is composed of small polyhedral grains
Summary
Lithium-ion batteries are used as power sources for a wide range of applications such as cellular phones, personal digital assistants [PDAs], laptop computers, and electric vehicles. We focused on the discharge capacity, rate capability, and cyclic performance of the pristine fluoride-coated LiCoO2 thin films to characterize the coating effect. The electrochemical properties of the pristine and coated LiCoO2 thin films were studied at various current densities (0.2, 0.4 and 0.6 mA· cm-2) in the voltage range of 4.25 to 3.0 V.
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