文献类型：期刊文献

中文题名：不同平均分子量PEG组合体系对合成LiFePO_4/C复合材料结构与电化学性能的影响

英文题名：Structural and Electrochemical Property of LiFePO_4/C Composites Prepared by Different PEG Combination Systems

作者：黄新虎[1];徐永刚[1];徐云龙[1];赵崇军[1]

机构：[1]华东理工大学材料科学与工程学院超细材料制备与应用教育部重点实验室上海市先进聚合物材料重点实验室,上海200237

年份：2011

卷号：37

期号：4

起止页码：439

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：上海市科学技术委员会"创新行动计划"(纳米专项0852nm02300)

语种：中文

中文关键词：正极材料;LiFePO4/C;PEG;电化学性能

外文关键词：cathode material; LiFePO4/C; PEG; electrochemical performance

摘要：以不同平均分子量的聚乙二醇(PEG)组合体系为纳米结构控制剂和碳源,采用旋转蒸干法制备了LiFePO4/C复合材料。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)和恒电流充放电测试等手段对其晶体结构、形貌与电化学性能进行了表征。结果表明:不同的PEG组合体系对LiFePO4的晶体尺寸和颗粒形貌具有调控作用,由PEG200+PEG35K(平均分子量为35 000的聚乙二醇)组合体系制备的LiFePO4/C颗粒呈球形,粒径细小而均匀,且具有较好的电化学性能,0.1C和1C倍率下首次放电比容量分别为168.3 mA.h/g和138.1 mA.h/g。
The LiFePO4/C composites were prepared by rotary evaporation method using different molecular weights polyethylene glycol（PEG） combination systems as the template and the carbon source.The crystal structure,morphology and electrochemical performance of the samples were investigated by X-ray diffraction（XRD）,scanning electron microscope（SEM）,transmission electron microscopy（TEM） and galvanostatic charge-discharge tests.The results show that the crystalline size and morphology of the LiFePO4/C composites can be controlled by the different combination systems.The sample synthesized using PEG200＋PEG35K as carbon source has spherical shape and small size with narrow size distribution.It shows the outstanding electrochemical performance with the first discharge capacities of 168.3 mA·h/g,138.1 mA·h/g at 0.1C and 1C rate respectively.