集聚经济
无定形固体
扩散
化学工程
电化学
形态学(生物学)
粒子(生态学)
多孔性
阴极
化学
材料科学
复合材料
电极
结晶学
热力学
物理化学
地质学
古生物学
工程类
物理
海洋学
作者
Ting Zhang,Jianguo Yu,Sen Lin
标识
DOI:10.1016/j.cej.2023.145938
摘要
FePO4 precursors with manipulated morphology were prepared by adjusting aging acidity and reduced to generate LiFePO4/C for systematic exploration of intermediate influence. The characterization results indicated that FePO4 morphology could be regulated drastically from amorphous intermediate to hydro-crystalline flower-like aggregates and to ellipsoid shape crystals owing to incremental aging acidity, with accompanying graver agglomeration at excessively low pH. It was determined that stable LiFePO4/C originated from porous hydro-crystalline intermediate at moderate pH of the aging process would perform an advantageous low-current capacity. However, cathode material generated from amorphous intermediates under less acidic aging would behave more prominently at high rate, owing to better diffusion kinetics and charge transfer brought by minimized particle size and higher specific surface area of the porous structure. Besides, exasperated morphology with severe particle growth and agglomeration of intermediate at excessive aging acidity would lead to apparent weakening effect to electrochemical performance of LiFePO4/C with discharge capacity decreased.
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