| 鸟巢状分级结构LiFePO4的合成及其电化学性能研究 | |
| Synthesis and Electrochemical Properties of LiFePO4 Hierarchically Nest-Like Microstructures | |
| 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1.2 g·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132.5 mAh·g-1。 | |
| 关键词: LiFePO4 溶剂热 机理 鸟巢状 锂离子电池 | |
| 基金项目: 国家自然科学基金（No.21276286）资助项目。 | |
| 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. A reasonable 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. | |
| Keywords: LiFePO4 solvothermal mechanism nest-like Li ion battery | |
| 投稿时间：2013-08-03 修订日期：2013-09-27 | |
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| 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,2014,30(2):235-241. | |
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