Effects of Heat Treatment Temperature on the Electrochemical Performance of LiV3O8 Obtained By Solid-State Method

The LiV₃O₈ compounds were synthesized by Solid-state method and calcination at different temperature (with heat treatment temperature ranging from 300 °C ∼ 600 °C) in order to find the relationship between heating temperature and electrochemical properties of LiV₃O₈.

The effects of precursor and heat treatment conditions on the structure, morphology, and electrochemical properties of the LiV₃O₈ were investigated by the implementation of X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), and energy dispersive spectroscopy (EDS). In order to find proper heat treatment temperature, TGA/DSC was performed too. All cells were cycled 50 times at a C-rate of 0.2 with the cut-off voltage ranging from 1.8 to 4.0V (versus Li/Li⁺). The result was analyzed by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV).

As the heat treatment temperature is increased, LiV₃O₈ has better crystalline phase but its primary particle size is grown bigger. For the sake of better electrochemical performances, especially high capacity retention, LiV₃O₈should have a proper size and size distribution.

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