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| 溶剂热法合成花状分级结构LiFePO4及其电化学性能研究 | |
| 引用本文： | 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, 2013, 29(18) |
| 作者姓名： | 郑贞苗 唐新村 汪洋 晋媛 孟佳 刘文明 王涛 |
| 作者单位： | 中南大学化学化工学院, 长沙 410083;中南大学化学化工学院, 长沙 410083;中南大学化学化工学院, 长沙 410083;中南大学化学化工学院, 长沙 410083;中南大学化学化工学院, 长沙 410083;中南大学化学化工学院, 长沙 410083;中南大学化学化工学院, 长沙 410083 |
| 基金项目： | 国家自然科学基金(No.21276286)资助项目。 |
| 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(1.3g·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74.8mAh·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 |
Solvothermal Synthesis and Electrochemical Performance of Flowerlike LiFePO4 Hierarchically Microstructures |
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| ZHENG Zhen-Miao,TANG Xin-Cun,WANG Yang,JIN Yuan,MENG Ji,LIU Wen-Ming and WANG Tao. Solvothermal Synthesis and Electrochemical Performance of Flowerlike LiFePO4 Hierarchically Microstructures[J]. Chinese Journal of Inorganic Chemistry, 2013, 29(18) | |
| Authors: | ZHENG Zhen-Miao TANG Xin-Cun WANG Yang JIN Yuan MENG Ji LIU Wen-Ming WANG Tao |
| Affiliation: | School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China |
| 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. Areasonable 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 |
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