【摘 要】
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Non-isothermal kinetics study on synthesis of LiFePO4@C nano-particles via the combination of sol-gel and carbothermal reduction method with raw materials L
【机 构】
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College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018
【出 处】
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2014中国溶胶-凝胶学术研讨会暨国际论坛
论文部分内容阅读
Non-isothermal kinetics study on synthesis of LiFePO4@C nano-particles via the combination of sol-gel and carbothermal reduction method with raw materials LiH2PO4、 FeC2O4.2H2O、 NH4VO3 and C6H12O6·2H2O, is studied by thermogravimetry-differential scanning calorimetry (TG-DSC) technology.The results indicate the synthesis process can be divided into two stages: dehydration and Li3V2(PO4)3@C formation.The apparent activation energy and natural logarithm frequency factor (In A-value) for dehydration reaction is respectively 93.6±5.0 kJ.mol-1 and 18.1 + 1.3 s-1, and that for LiFePO4@C formation reaction is in turn 193.6 + 10.4 kJ.mol-1 and 25.4 ± 1.7 s-1 , Additionally, the mechanism for dehydration and LiFePO4@C formation stages is Avramis A1.5 and A4,respectively.Furthermore, the dehydration process is diffusion controlled, and the crystallization of LiFePO4@C formation is controlled by nuclei being formed randomly and growing in three-dimensions.
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