Abstract
Crystalline LiCoO 2 nano-powders for lithium-ion battery were synthesized by aerosol flame deposition (AFD). The aqueous precursor solution was atomized with an ultrasonic vibrator and supplied to the oxy-hydrogen flame by flowing dry Ar gas. The as-deposited soot powders were collected on a substrate placed on a heating stage. X-ray diffraction and transmission electron microscopy (TEM) show that the soot powders were composed of nano-sized particles of Li 2CO 3, CoCo 3 and Co 3O 4 and the subsequent heat treatments at 700 °C for 5 h that converted these powders to well-layered LiCoO 2 powder. The flow rate of H 2 flame gas was discovered to have influenced the phase composition in the as-deposited soot. The electrochemical performance of synthesized nano-powders was investigated using 2032 coin-type cell. LiCoO 2 nano-powder synthesized at an H 2 flow rate of 2.5 l/min sintered at 700 °C for 5 h showed a first discharge capacity of 144 mAh/g and good rechargeability in Li//1 M LiPF 6-EC/DEC//LiCoO 2 cells between 3 and 4.3 V.
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