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Preparation of high purity iron phosphate based on the advanced liquid-phase precipitation method and its enhanced properties
Journal of Solid State Chemistry ( IF 3.3 ) Pub Date : 2020-04-03 , DOI: 10.1016/j.jssc.2020.121346
Ju Guo , Mei Yu , Fuyong Wu

The traditional liquid-phase precipitation method has been a significant challenge when preparing iron phosphate. Herein, we optimized it by adding surfactants. The effects of surfactant types with the purity, morphology, particle size and structure of iron phosphate were studied. In contrast to many iron phosphate which undergo serious uncontrol morphology, such as particle size, agglomeration and so on, the optimized results show that rational use of surfactants can reduce the impurities content of iron phosphate, refine particle size, reduce particle agglomeration, and improve morphological consistency, while the effect of adding cationic surfactant CTAB is better than that of anionic surfactant SDBS. Moreover, lithium iron phosphate cathode materials were synthesized using iron phosphate prepared by adding different surfactants as precursors, and electrochemical performance tests were performed. The results reveal that the sample prepared with CTAB has excellent electrochemical performance, which is significantly better than the sample prepared without added surfactant. At a rate of 0.1 C, the specific discharge capacity is increased by 3.41%–158.74 mA h/g, and the capacity decay rate is reduced by 53.98%–1.34%, and the charge transfer resistance decreased by 69.6%–83.99 Ω, showing excellent potential industry application.



中文翻译:

基于先进液相沉淀法制备高纯磷酸铁及其增强性能

在制备磷酸铁时,传统的液相沉淀法一直是一项重大挑战。本文中,我们通过添加表面活性剂对其进行了优化。研究了表面活性剂类型对磷酸铁的纯度,形态,粒径和结构的影响。优化后的结果表明,与许多磷酸铁颗粒的粒径,团聚等严重的失控形态相比,优化的结果表明,合理使用表面活性剂可以降低磷酸铁的杂质含量,细化粒径,减少颗粒的团聚并改善形态一致性,而添加阳离子表面活性剂CTAB的效果优于阴离子表面活性剂SDBS。此外,使用磷酸铁合成了磷酸铁锂正极材料,该磷酸铁是通过添加不同的表面活性剂作为前体制备的,并进行了电化学性能测试。结果表明,用CTAB制备的样品具有优异的电化学性能,这明显好于不添加表面活性剂的样品。在0.1 C的速率下,比放电容量增加3.41%–158.74 mA h / g,容量衰减率降低53.98%–1.34%,电荷转移电阻降低69.6%–83.99Ω,显示出极好的潜在行业应用。

更新日期:2020-04-03
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