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首页> 外文期刊>International Journal of Electrochemical Science >Preparation and Performance of the Cathode Precursor Ferric Phosphate for Li-ion Battery Facilitated by Impinging Stream
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Preparation and Performance of the Cathode Precursor Ferric Phosphate for Li-ion Battery Facilitated by Impinging Stream

机译：撞击流促进锂离子电池正极前体磷酸铁的制备及性能

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An improved impinging stream reactor (ISR) was developed to synthesize the cathode precursor ferricphosphate by performing the reaction between Fe(NO3)39H2O and H3PO4 with aqueous ammonia asthe precipitating agent. The chemical formula for the synthesized product was identified to beFePO43H2O based on the powder X-ray diffraction (XRD), thermogravimetry and differentialscanning calorimeter (TG-DSC), and Fourier transform infrared spectrophotometry (FT-IR)measurements. The FePO43H2O particles were amorphous and will change to pure crystalline phaseo of anhydrous FePO4 after heating treatment in air at 600 C for 5 hours. The particle size distribution(PSD) and morphology were characterized by the laser particle size analyzer and scanning electronmicroscope (SEM), respectively. It was found that the FePO43H2O prepared by ISR particle size ismuch finer and PSD is much narrower than that by stirred tank reactor (STR). The flow behaviour ofboth ISR and STR were investigated by determining the residence time distributions (RTD) using anelectroconductivity input-response technique with KCl solution as the tracer. Bourne reaction schemewas employed to investigate the micromixing effects in both ISR and STR. The results show that thedegrees of backmixing in the two reactors are similar, but the micromixing effect in the former is muchbetter than that in the latter, which accounts for the FePO43H2O produced by ISR possess finer sizeand narrower PSD. The cell performance test results indicate that the LiFePO4/C obtained fromFePO43H2O produced by ISR can exhibit a better electrochemical property.
机译：开发了一种改进的撞击流反应器（ISR），通过在Fe（NO3）39H2O和H3PO4之间以氨水为沉淀剂进行反应来合成阴极前驱体三磷酸铁。根据粉末X射线衍射（XRD），热重分析和差示扫描量热仪（TG-DSC）以及傅里叶变换红外分光光度法（FT-IR）测量，确定合成产物的化学式为FePO43H2O。 FePO43H2O颗粒为无定形，在空气中于600°C加热处理5小时后，将变为无水FePO4的纯结晶相。分别用激光粒度分析仪和扫描电镜（SEM）表征了粒度分布（PSD）和形貌。已发现，通过ISR粒度制备的FePO43H2O比通过搅拌釜反应器（STR）制备的FePO43H2O细得多，而PSD则窄得多。通过以KCl溶液为示踪剂的电导率输入响应技术确定停留时间分布（RTD），研究了ISR和STR的流动行为。采用Bourne反应方案研究了ISR和STR中的微混合效应。结果表明，两个反应器的返混程度相似，但前者的微混合效果要好于后者，这说明ISR生产的FePO43H2O具有较细的尺寸和较窄的PSD。电池性能测试结果表明，由ISR生产的FePO43H2O获得的LiFePO4 / C具有更好的电化学性能。

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