Characterization and electrochemical properties of LiMn₂O₄ thin films prepared by solution deposition

Abstract

LiMn₂O₄ thin films were prepared by solution deposition using lithium acetate and manganese acetate as raw materials. The phase constitution and surface morphology were observed by X-ray diffraction and scanning electron microscopy. The electrochemical properties of the thin films were studied by cyclic voltammetry, charge-discharge experiments and impedance spectroscopy in 1 mol·L⁻¹ LiPE₆/EC-DMC solution using lithium metal as both the counter and reference electrodes. The films prepared by this method are of spinel phase. The lattice parameter increases with the annealing temperature and annealing time. The film annealed at 750°C for 30 minutes has the highest capacity of 34.5 μAh·cm⁻²·μm⁻¹, and its capacity loss per cycle is 0.05% after being cycled 100 times.

Keywords

thin films / lithium manganese oxide / lithium-ion battery / solution deposition

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