Effect of fuel rate and annealing process of LiFePO4 cathode material for Li-ion batteries synthesized by flame spray pyrolysis method

Abstract

Effect of the flame temperature on the characteristics of zirconium oxide fine particle synthesized by flame assisted spray pyrolysis AIP Conference Proceedings 1554, 150 (2013) Abstract. In this study the effect of fuel rate and annealing on particle formation of LiFePO4 as battery cathode using flame spray pyrolysis method was investigated numerically and experimentally. Numerical study was done using ANSYS FLUENT program. In experimentally, LiFePO4 was synthesized from inorganic aqueous solution followed by annealing. LPG was used as fuel and air was used as oxidizer and carrier gas. Annealing process attempted in inert atmosphere at 700°C for 240 min. Numerical result showed that the increase of fuel rate caused the increase of flame temperature. Microscopic observation using Scanning Electron Microscopy (SEM) revealed that all particles have sphere and polydisperse. Increasing fuel rate caused decreasing particle size and increasing particles crystallinity. This phenomenon attributed to the flame temperature. However, all produced particles still have more amorphous phase. Therefore, annealing needed to increase particles crystallinity. Fourier Transform Infrared (FTIR) analysis showed that all particles have PO4 function group. Increasing fuel rate led to the increase of infrared spectrum absorption corresponding to the increase of particles crystallinity. This result indicated that phosphate group vibrated easily in crystalline phase. From Electrochemical Impedance Spectroscopy (EIS) analysis, annealing can cause the increase of Li + diffusivity. The diffusivity coefficient of without and with annealing particles were 6.84399×10 -10 and 8.59888×10-10 cm 2 s -1 , respectively.

Structure and Magnetic Properties of AO and LiFePO4/C Composites by Sol-Gel Combustion Method

“…The infrared vibration absorption peak of the Mg-O bond appears at about 870, 598, 440 cm −1 [ 48 , 49 ], indicating that there is an infrared characteristic peak of magnesium oxide. In general, the vibration absorption peak patterns of the infrared spectra of six MgO and LiFePO 4 /C composite samples with different mass ratios are basically consistent with the FTIR test peak patterns of lithium iron phosphate by Heru Setyawan et al [ 50 ], with vibration absorption peaks corresponding to lithium iron phosphate.…”

“…That is, it is antiferromagnetic when the temperature is lower than 50 K, and paramagnetic when the temperature is higher than 50 K. The six samples analyzed at room temperature should be paramagnetic, the hysteresis loop of theory should be a straight line, and the hysteresis loop area should be zero. It can be seen from the results that the hysteresis loop area is small, while the coercivity of the sample is relatively large, showing weak ferromagnetism, which may be caused by ferrous or ferromagnetic impurities after the introduction of magnesium oxide [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , ...…”

A Pilot Plant Study of Coal Dryer: Simulation and Experiment

“…Thus, understanding the chemical and physical phenomena inside of the dryer is necessary. Computational Fluid Dynamic (CFD) method (Halim et al 2013(Halim et al , 2014Siripaiboon et al 2020) Then, modeling reactions using species transport through the convection-diffusion equation.…”