| 溶剂热法合成花状分级结构LiFePO4及其电化学性能研究 | |
| Solvothermal Synthesis and Electrochemical Performance of Flowerlike LiFePO4 Hierarchically Microstructures | |
| 摘要: 以乙二醇/水为溶剂,酒石酸铵为添加剂和碳源,采用溶剂热法,制备了高振实密度(1.3 g·cm-3)的锂离子正极材料磷酸铁锂(LiFePO4)。采用X射线衍射(XRD)、红外光谱、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对样品进行了表征。研究结果表明样品为单晶纳米片组装而成的花状三维多孔分级结构LiFePO4。通过时间单因素实验探讨花状分级结构LiFePO4的生长机理,其生长过程概括为:成核和生长,定向组装。电化学性能测试结果表明LiFePO4样品具有优异的倍率性能(10C时放电比容量保持在74.8 mAh·g-1)与循环性能(50次循环后容量保持率>93%)。 | |
| 关键词: LiFePO4 花状结构 溶剂热 倍率性能 循环性能 | |
| 基金项目: 国家自然科学基金(No.21276286) 资助项目。 | |
| Abstract: The cathode material LiFePO4 with high tap density of 1.3 g·cm-3 was synthesized via a solvothermal technique, using ammonium tartrate as additive and carbon source, and ethylene glycol/water as solvent. The as-prepared samples were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning and transmission electron microscopies. The results show that the as-prepared samples were flowerlike LiFePO4 which consists of single-crystalline nanoplates with an open porous hierarchical structure. A reasonable formation mechanism is proposed based on time dependent experiments. The main evolving process involves the following steps: nucleation, growth and oriented assembling. The electrochemical properties of the LiFePO4 cathode is found to exhibit excellent rate capability (i.e., discharge capacity of 74.8 mAh·g-1 at 10C) and cycling performance (i.e., > 93% of capacity retention rate after 50 cycles). | |
| Keywords: LiFePO4 flowerlike structure solvothermal rate capacity cycle performance | |
| 投稿时间：2014-10-22 修订日期：2014-12-24 | |
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| 郑贞苗,唐新村,汪洋,晋媛,孟佳,刘文明,王涛.溶剂热法合成花状分级结构LiFePO4及其电化学性能研究[J].无机化学学报,2015,31(4):731-738. | |
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