Nonisothermal Kinetics Study with Isoconversional Procedure and DAEM: LiCoPO4 Synthesized from Thermal Decomposition of the Precursor

详细信息    查看全文

• 作者：Yu He ; Sen Liao ; Zhipeng Chen ; Yu Li ; Yao Xia ; Wenwei Wu ; Bin Li
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：February 6, 2013
• 年：2013
• 卷：52
• 期：5
• 页码：1870-1876
• 全文大小：299K
• 年卷期：v.52,no.5(February 6, 2013)
• ISSN：1520-5045

文摘

The precursor of LiCoPO₄ was synthesized by solid-state reaction at low-heating temperature using LiOH路H₂O and NH₄CoPO₄路H₂O as raw materials. LiCoPO₄ was obtained by calcining the precursor. Based on isoconversional procedure and the distributed activation energy model (DAEM), the activation energies calculated indicate that the thermal process involves two regions, of which Region II (伪 = 0.38鈥?.90) is a kinetically complex process but Region I (伪 = 0.10鈥?.38) is a single-step process. The most probable mechanism for the Region I is two-dimensional diffusion. The distributed activation energy model (DAEM) was applied to study the Region II of decomposition process of the precursor. The distributions of activation energy, f(E_伪) and values of pre-exponential factor A of the Region II of the thermal decomposition of precursor were obtained on the basis of the DAEM. The reliability of the DAEM for the Region II was tested by the comparison between experimental plots and calculated plots. The results show that the prediction of DAEM is reliable.