文献类型：期刊文献

中文题名：PEG对LiFePO_4/C结构与性能的影响

英文题名：Effect of PEG on structure and performance of LiFePO_4/C

作者：陶丽丽[1];徐云龙[1];黄华庆[1];马红彦[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200237

年份：2009

卷号：33

期号：4

起止页码：284

中文期刊名：电源技术

外文期刊名：Chinese Journal of Power Sources

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

基金：上海市重点学科建设项目;上海市纳米科技专项(05nm05018)资助项目

语种：中文

中文关键词：正极材料;LiFePO4/C;分解速率;PEG

外文关键词：cathode material; LiFePO4／C; decomposing rate; PEG

摘要：以PEG为碳源,采用共沉淀法合成了LiFePO4/C复合正极材料。采用热重和示差扫描量热分析(TG-DSC)分析了前驱体的热分解过程;通过X射线衍射(XRD)、扫描电镜仪(SEM)和恒电流充放电测试等手段对材料的结构、形貌和电化学性能进行了表征。考察了PEG的分解速率和添加量对材料结构、形貌和电化学性能的影响。结果表明:当PEG分解温度区间的升温速率为6℃/min、n(PEG)∶n(LFP)=0.5∶1时,合成的正极材料具有较好的电化学性能,0.1C倍率下首次放电比容量达到164.7mAh/g,循环30次后,比容量衰减率为4.75%。
LiFePO4/C composite was synthesized via co-precipitation method with PEG as carborr source. The pyrolysis process of precursor was monitored by TG-DSC. The structure, morphology and electrochemical properties of LiFePO4/C were characterized by XRD,SEM and galvanostatic charge-discharge techniques, respectively. The influence of decomposing rate and the amount of PEG on structure, morphology and electrochemical properties was studied. The optimum experimental conditions is 6 ℃/min of heating rate and n （PEG） ： n （LFP）=0.5 ： 1, and the discharge capacity up to 164.7 mAh/g is obtained at 0.1 C and the loss is only 4.75% after 30 cycles.