碳前驱体对LiFePO_4/C复合材料的形貌及电化学性能的影响  

Effect of carbon precursor on morphology and electrochemical performance of LiFePO_4/C composite

作　　者：陈晗[1] 龚文强[1] 刘友良[1] 刘建华[1] 

机构地区：[1]湖南工业大学冶金工程学院,湖南株洲412000

出　　处：《功能材料》2010年第3期473-475,480,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50672024);湖南省自然科学基金资助项目(09JJ5010);湖南省教育青年项目对本课题的大力支持

摘　　要：采用葡萄糖、环氧树脂、酚醛树脂为碳源制备了LiFePO4/C复合材料。利用X射线衍射、扫描电镜等方法对复合材料进行研究。结果表明,葡萄糖获得了碳包覆复合材料,而环氧树脂、酚醛树脂则得到了碳芯结构复合材料。碳芯结构复合材料的电化学性能优于碳包覆复合材料,电流密度为15mA/g时,试样C、D的放电容量分别为165、167mAh/g;电流密度为600mA/g时,试样C、D的放电容量分别为139.4、145.5mAh/g,经过50循环后容量保持率分别高达99.2%、99.5%。LiFePO_4/C composites were synthesized by using glucose,epoxy resin and phenolic resin as carbon sources.LiFePO_4/C composites were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The experimental results show that carbon-coated LiFePO_4/C composite was acquired by using glucose,however LiFePO_4/C composites with carbon core structure were acquired by using epoxy resin and phenolic resin.The electrochemical performances of LiFePO_4/C composites with carbon core structure are more excellent than those of carbon-coated LiFePO_4/C composite.When 15mA/g current was applied,the initial discharge capacities of samples C and D attain to 165,167mAh/g,respectively.When 600mA/g current was applied,their discharge capacities are 139.4,145.5mAh/g,and their capacity retention are 99.2% and 99.5% through 50 cycles,repectively.

关 键 词：锂离子电池 LIFEPO4 复合材料 碳前驱体 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]