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Formation kinetics of sol-gel derived LiFePO4 olivine analyzed by reliable non-isothermal approach

Amri, A., Hendri, Y.B., Saputra, E., Heltina, D., Yin, C-Y, Rahman, M.M.ORCID: 0000-0002-6778-7931, Minakshi, M.ORCID: 0000-0001-6558-8317, Mondinos, N. and Jiang, Z-T (2022) Formation kinetics of sol-gel derived LiFePO4 olivine analyzed by reliable non-isothermal approach. Ceramics International, 48 (12). pp. 17729-17737.

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The formation kinetics of LiFePO4 Olivine synthesized through sol-gel route has been studied by non-isothermal approach. LiFePO4 precursors were prepared by mixing lithium dihydrogen phosphate (LiH2PO4) and iron (III) citrate (C6H5FeO7) and subsequently calcined in an Argon atmosphere at temperatures ranged from of 300–900 °C to form LiFePO4 products. Thermal behaviors of calcination process were analyzed by thermogravimetry (TGA) and differential scanning calorimetry (DSC) simultaneously, while the mineralogical properties of LiFePO4 were characterized using X-ray diffractometer (XRD). The kinetic parameters were determined by Ozawa–Flynn–Wall (OFW), Kissinger, and Kissinger-Akahira-Sunose (KAS) methods, and the reaction mechanism model was evaluated by Coats–Redfern approach. The results indicated that the reaction model of LiFePO4 formation agreed with the three-dimensional diffusion mechanism. The temperature had an essential role in the synthesis of LiFePO4. The optimum calcination temperature was 700 °C where this condition produced LiFePO4 Olivine with high degree of crystallinity, better lattice parameters and phase purity.

Item Type: Journal Article
Murdoch Affiliation(s): Mathematics, Statistics, Chemistry and Physics
Publisher: Elsevier Ltd
Copyright: © 2022 Elsevier Ltd and Techna Group S.r.l.
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