Citation: HUANG Ying-Heng, TONG Zhang-Fa, WEI Teng-You, LI Bin. Reaction Kinetics of the Intermediate in Synthesis of LiCoPO₄ by Solid-State Reaction[J]. Acta Physico-Chimica Sinica, ;2011, 27(06): 1325-1334. doi: 10.3866/PKU.WHXB20110507 shu

Reaction Kinetics of the Intermediate in Synthesis of LiCoPO₄ by Solid-State Reaction

1.
1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P. R. China;
2. Department of Metallurgy Engineering, Guilin University of Technology at Nanning, Nanning 530001, P. R. China

Received Date: 25 November 2010
Available Online: 25 March 2011
Fund Project: 国家自然科学基金(20766001) (20766001) 广西青年科学基金(0728101) (0728101)广西教育厅科研项目(200505083)资助 (200505083)

A precursor NH₄CoPO₄ containing Li⁺ was synthesized using a low temperature solid-state reaction with ammonium dihydrogen phosphate, cobalt acetate, and lithium hydroxide. LiCoPO₄ powder was manufactured by high temperature baking. The products were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and thermogravimetry-differential thermal analysis (TG-DTA). The results showed that the formation of the intermediates was effected by the baking atmosphere. NH₄CoPO₄ containing Li⁺ was dehydrated and deaminated in air at 210?500 °C and then the (CoHPO₄·LiCoPO₄·Co₂(OH)PO₄·Li₃PO₄) intermediate (acid-base community) was emerged during the reaction process. The intermediate formation reaction mechanism followed the interfacial reaction power-law with an apparent activation energy of 50.0 kJ·mol^-1. The kinetic function was found to be g(x)=(1-α)^-1. The intermediate was dehydrated to form LiCoPO₄ with an average apparent activation energy of 54.2 kJ·mol^-1. The formation of the intermediate was not affected by the process of crystallization or non- crystallization of the materials. High temperatures accelerated the decomposition reaction of the intermediate and then the formation of LiCoPO₄ crystals. A perfect crystal of LiCoPO₄ was obtained by the decomposition of the intermediate at temperatures higher than 550 °C.
- LiCoPO₄,
- Lithium orthophosphate,
- Intermediate,
- Solid state reaction,
- Reaction mechanism,
- Kinetics
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沈阳化工大学材料科学与工程学院沈阳 110142

Reaction Kinetics of the Intermediate in Synthesis of LiCoPO4 by Solid-State Reaction

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通讯作者: 陈斌, bchen63@163.com

Reaction Kinetics of the Intermediate in Synthesis of LiCoPO₄ by Solid-State Reaction