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Abstract
A LiCoO2 thin film on a quartz glass substrate was fabricated by a wet process involving heat treatment of a precursor film spray-coated with an aqueous ammonia solution containing LiCH3COO and Co(CH3COO)2. The precursor film formed onto the substrate at 180 °C in air, and was heat treated at 500 °C in air for 0.5 h. The obtained film was spin-coated further with an ethanol-based precursor solution containing identical metal acetates, and heat treated at 500 °C in air for 0.5 h. The X-ray diffraction pattern of the resultant film showed only peaks assignable to the layered-rock-salt LiCoO2. Raman spectroscopy measurements revealed vibrational modes assignable to layered rock salt LiCoO2, with minor content of less than 5 mol% of spinel-type Co3O4. The field emission scanning electron microscopy images indicated that the resultant film was 0.21 μm thick, had no voids, and was a combination of small rounded grains measuring 18 nm in diameter and hexagonal grains larger than 0.2 μm in length. The Hall effect measurements indicated that the resultant thin film was a p-type semiconductor with electrical resistivity of 35(2) Ω·cm and a carrier concentration and carrier mobility of 8(2) × 1016 cm−3 and 2(1) cm2·V−1·s−1, respectively.
Highlights
Layered rock salt LiCoO2 (LCO) has been extensively studied and successfully applied as anLi intercalation compound in lithium-ion batteries (LIBs), due to its high specific energy-density and structural stability that promotes extended battery cyclability [1,2,3,4,5,6]
Thin films of LCO have been fabricated via the sol-gel method [3,9,10,11] at high temperatures and prolonged annealing conditions, which are likely to lead to moderate lithium loss and compromise the electrochemical properties of the materials [3,12]
The fabrication of a thin film of LCO on a quartz glass substrate was achieved at low temperature and with a short annealing duration
Summary
Layered rock salt LiCoO2 (LCO) has been extensively studied and successfully applied as anLi intercalation compound in lithium-ion batteries (LIBs), due to its high specific energy-density and structural stability that promotes extended battery cyclability [1,2,3,4,5,6]. The thin film electrodes are free from impurities such as binders and carbon fillers used in the fabrication of bulk electrodes. Techniques such as magnetron sputtering and pulsed laser deposition (PLD) are capable of depositing high quality thin films of LCO [7,8]. They are associated with expensive and complicated experimental setups that require ultra-high vacuum systems. Thin films of LCO have been fabricated via the sol-gel method [3,9,10,11] at high temperatures and prolonged annealing conditions, which are likely to lead to moderate lithium loss and compromise the electrochemical properties of the materials [3,12]
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