Synthesis, the structural and thermal stability of LiCo1 − xFexPO4

• Published in: Journal of thermal analysis and calorimetry Vol. 148; no. 10; pp. 3981 - 3991
• Main Authors: Aboraia, A. M., Hamdalla, Taymour A., Darwish, A. A. A., Alotaibi, B. M., Al-Ghamdi, S. A., Alfadhli, S., Saad, Mohamed, Zakaly, H. M. H., Shaaban, E. R., Soldatov, Alexander
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.05.2023; Springer Nature B.V
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Conversion; Electrical resistivity; Electrode materials; Heating rate; High temperature; Inorganic Chemistry; Iron; Lithium compounds; Low temperature; Mathematical analysis; Measurement Science and Instrumentation; Phosphates; Physical Chemistry; Polymer Sciences; Pyrolysis; Structural stability; Thermal stability; Thermodynamics; LiCoPO; Electrochemical performance; Rietveld refinement; Hydrothermal technique; Thermal stability; Phase transition
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-023-12030-6

LiCoPO 4 is considered the most interesting positive electrode material. Therefore, 4 different percentages of LiCo 1 − x Fe x PO 4 were synthesized by a hydrothermal route at low temperatures. The as-prepared sample has a single orthorhombic Pn21a-phase at 220 °C. As a result, the thermodynamics and combustion process were investigated at numerous rates of heating, and the kinetic parameters were calculated using thermogravimetric experiments. Pyrolysis went to the high-temperature region with an increase in intensity in heating rate, according to the TGA study of the combustions. Three stages were determined according to the TGA analysis, and each stage predicted another phase which was confirmed by XRD. The thermodynamics study of LiCo 1 − x Fe x PO 4 materials was an efficient technique to investigate the temperature impact on the pyrolysis activity, which may be beneficial in many contemporary applications. The values of Avrami exponent n(χ) calculated in terms of conversion rate d χ/ d t of the first, second, and third conversion peak is 2.22 and 2.95 (for different compositions of LiCo 1 − x Fe x PO 4 (0 ≤  x  ≤ 20)), respectively. The Impedance spectrum shows that the increase in the Fe content improves the electrical conductivity of LiCoPO 4 .