| 鸟巢状分级结构LiFePO4的合成及其电化学性能研究 |
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| 引用本文： | 黄富勤,唐新村,肖元化,龚美丽,郑贞苗,晋媛.鸟巢状分级结构LiFePO4的合成及其电化学性能研究[J].无机化学学报,2013,29(18). |
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| 作者姓名： | 黄富勤 唐新村 肖元化 龚美丽 郑贞苗 晋媛 |
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| 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;郑州轻工业学院材料与化学工程学院, 河南省表界面科学重点实验室, 郑州 450002;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 |
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| 基金项目： | 国家自然科学基金（No.21276286）资助项目。 |
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| 摘 要： | 采用溶剂热法，以乙二醇为溶剂，P123为软模板剂，制备了锂离子电池正极材料磷酸铁锂(LiFePO4)，其振实密度约为1.2g·cm-3。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨透射电子显微镜(HRTEM)和BET对样品的成分、晶型，形貌和孔结构进行了表征。结果表明：鸟巢状LiFePO4由单晶纳米片组成，具有开放的三维多孔分级结构。通过时间单因素实验探讨鸟巢状分级结构LiFePO4的生长机理，其生长过程可以概括为：成核定向生长团聚定向生长。电化学性能测试结果表明材料在0.1C倍率下充放电时，其首次放电比容量达132.5mAh·g-1。
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| 关 键 词： | LiFePO4 溶剂热 机理 鸟巢状 锂离子电池 |
| 收稿时间： | 8/3/2013 12:00:00 AM |
Synthesis and Electrochemical Properties of LiFePO4 Hierarchically Nest-Like Microstructures |
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| HUANG Fu-Qin,TANG Xin-Cun,XIAO Yuan-Hu,GONG Mei-Li,ZHENG Zhen-Miao and JIN Yuan.Synthesis and Electrochemical Properties of LiFePO4 Hierarchically Nest-Like Microstructures[J].Chinese Journal of Inorganic Chemistry,2013,29(18). |
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| Authors: | HUANG Fu-Qin TANG Xin-Cun XIAO Yuan-Hu GONG Mei-Li ZHENG Zhen-Miao and JIN Yuan |
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| Institution: | College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;State Laboratory of Surface and Interface Science and Technology, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China |
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| Abstract: | The cathode material LiFePO4 with tap density of ca. 1.2 g·cm-3 was synthesized by solvothermal method, using P123 as soft template and ethylene glycol as solvent. The composition, crystal shape, morphology and pore structure of the as-prepared samples were characterized by X-ray diffraction(XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM), Brunauer-Emmett-Teller (BET). The results show that the nest-like LiFePO4 consists of single-crystalline nanoplates with an open three-dimensional porous hierarchical structure. Areasonable formation mechanism is proposed based on time dependent experiments. The main evolving process involves the following steps: nucleation, oriented growth, aggregation and oriented growth. The electrochemical testing results show that the initial discharge specific capacities of nest-like LiFePO4 reach to 132.5 mAh·g-1 at 0.1C. |
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| Keywords: | LiFePO4 solvothermal mechanism nest-like Li ion battery |
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