| EDTA辅助水热法制备性能优异的棒状LiFePO4/C材料 |
| EDTA-Assisted Hydrothermal Synthesis for Rod-Like LiFePO4 with Enhanced Electrochemical Properties |
| 作者 | 单位 | E-mail | | 董静 | College of Chemical Engineering, Sichuan University, Chengdu 610065, China | | | 钟本和 | College of Chemical Engineering, Sichuan University, Chengdu 610065, China | | | 钟艳君 | College of Chemical Engineering, Sichuan University, Chengdu 610065, China | | | 唐艳 | College of Chemical Engineering, Sichuan University, Chengdu 610065, China | | | 刘恒 | College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China | | | 郭孝东 | College of Chemical Engineering, Sichuan University, Chengdu 610065, China | xiaodong2009@scu.edu.cn |
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| 摘要: 以乙二胺四乙酸为配位剂采用水热法制备了棒状LiFePO4/C材料。采用X射线衍射、扫描电镜、透射电镜、循环伏安、交流阻抗和恒电流充放电测试等对材料进行表征。结果表明:乙二胺四乙酸对材料的形貌和电性能均有很大影响。通过加入乙二胺四乙酸,材料的形貌由不规则的颗粒变为棒状的颗粒且颗粒的厚度由140～200nm减少至40～90nm,材料的表面包覆约3.5nm的均匀碳层,且该材料极化较小且界面阻抗较低。0.1C放电比容量为167mAh·g-1(接近理论容量170mAh·g-1)。 |
| 关键词: 材料科学 水热法 循环伏安 锂电池 LiFePO4 乙二胺四乙酸 |
| 基金项目: 四川大学青年基金(No.2011SCU11081);教育部高校博士学科点科研基金(No.20120181120103)资助项目 |
| Abstract: Rod-like LiFePO4 was synthesized by hydrothermal method using ethylene diamine tetraacetic acid (EDTA) as complexing agent to control the growth of the crystal. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge test. The results show that EDTAhas great influence on the morphology and electrochemical performance. The crystal morphology develops from irregular particles to rod-like particles and the thickness of the particles decreases from 140～200 nm to 40～90 nm by adding EDTAand the obtained LiFePO4/Cwith EDTAexhibits a homogenous carbon coating layer with a thickness of ～3.5 nm. The discharge capacity is 167 mAh·g-1 (close to the theoretical capacity of 170 mAh·g-1) at 0.1C. The CVand EISresults indicate the samples prepared with EDTAhave a lower polarization and lower interfacial resistance. |
| Keywords: materials science hydrothermal synthesis voltammetry lithium ion batteries lithium iron phosphate ethylene diamine tetraacetic acid |
| 投稿时间：2013-03-21 修订日期：2013-05-17 |
| 摘要点击次数: 1941 |
| 全文下载次数: 1915 |
| 董静,钟本和,钟艳君,唐艳,刘恒,郭孝东.EDTA辅助水热法制备性能优异的棒状LiFePO4/C材料[J].无机化学学报,2013,29(10):2257-2264. |
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