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

Abstract

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.[1] J. Feng, X. Liu, X. X. Zhang, J.Jiang, Z. Zhao, and M. Wang, J. Electrochem. Soc, 156, A768 (2009) [2] H. Yang, J. Li, X.G. Zhang, Y.L. Jin, J. Mat. pro. tec, 207, 265 (2008)[3] D. Wang, L. Cao, J. Huang, J. Wu, Ceram. Int, 38, 2647, (2012)[4] Y.Q. Qiao, J.P. Tu, X.L. Wang, J. Zhang, Y.X. Yu, and C.D. Gu, J. Phys. Chem, 115, 25508 (2011)