反应时间对溶剂热法合成氟代硫酸铁锂材料的性能影响
首发时间:2017-04-21
摘要:本文采用溶剂热法制备锂离子电池正极材料LiFeSO4F,选择绿色环保的四甘醇作为反应介质,通过对反应物的热分析(TG)确定反应温度,并对溶剂热法合成中高温高压反应釜加热阶段的加热时间进行梯度探讨。对不同条件下合成的LiFeSO4F进行X射线衍射(XRD)、场发射扫描电镜(SEM)对材料的晶型和形貌进行观察;通过组装电池的充放电测试以及循环性能测试,从而对其电化学性能进行比较。实验结果表明,在反应温度为260℃条件下,反应时间为6天时,制备得到的正极材料LiFeSO4F具有最稳定的电化学性能,在0.05C倍率条件下首次放电可达98.47mAh/g,经过50圈循环后容量依然可以保持初始容量的97.68%,具有较好的循环性能。
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The effects of reaction time on the performance of LiFeSO4F material synthesized by solvothermal method
Abstract:Solvothermal method was chosen to synthesize LiFeSO4F in this paper, and the green and environmentally friendly tetraethylene glycol (TEG) had been chosen to be the reaction solvent. The range of reaction temperature was determined by the thermal analysis (TG) of the reactants. Meanwhile, the heating temperature of reaction kettle in the solvothermal approach had been discussed. The crystal structure and morphology test, such like X-ray diffraction (XRD), scanning electron microscope (SEM),had been conducted. Constant current charge-discharge test had been carried out to contrast the LiFeSO4F samples synthesized by different reaction conditions. The experimental results showed that the best reaction condition was under 260℃for 6 days. The LiFeSO4F synthesized by this reaction condition can obtain an original discharge specific capacity of 98.47mAh/g at 0.05C and capacity retention of 97.68% after 50 cycles. Besides, it also showed a good behavior in cycle performance.
Keywords: LiFeSO4F Lithium ion battery solvothermal
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No.4725591119388414****
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反应时间对溶剂热法合成氟代硫酸铁锂材料的性能影响
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