不同碳源对LiFePO_4/C锂离子电池正极材料性能的影响  

Effect of different carbon source on the performance of LiFePO_4/Ccathode material for lithium-ion batteries

作　　者：陈亮[1] 王远洪[1] 刘恒[1] 张军[1] 王巍[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610064

出　　处：《化学研究与应用》2011年第9期1221-1225,共5页Chemical Research and Application

摘　　要：以自制的正磷酸铁为铁和磷源,氢氧化锂为锂源,分别以酚醛树脂、葡萄糖、柠檬酸为碳源,采用碳热还原法合成LiFePO4/C锂离子电池正极材料。采用X射线衍射(XRD)、扫描电镜(SEM)、四探针电导测定及恒流充放电测试分别对合成样品的物相、粒径、表面形貌、电导率及电性能进行了分析。结果表明以酚醛树脂为碳源制备的Li FePO4/C材料具有更小的颗粒尺寸、更高的电导率和更优异的电化学性能。0.1C首放电比容量达到165.52 mAh/g。0.5C,1C,2C,5C和10 C倍率放电比容量分别为156.93 mAh/g,146.73 mAh/g,135.85 mAh/g,119.02 mAh/g和105.25 mAh/g。Olivine-type lithium iron phosphate was synthesized by carbothermal reduction method with ferric orthophosphate lithium hydroxide,and source of carbon such as phenolic resin,glucose and citric acid respectively.The Phase,particle size,surface morphology,conductivity and electrical properties were characterized by XRD,SEM,four-probe conductivity meter and electrochemical performance test.The results showed that LiFePO4/C synthesized with phenolic resin had much smaller particle size,higher conductivity and superior electrochemical performance than that of products with glucose or citric acid.The initial discharge capacity was achieved to 165.52mAh/g at 0.1C rate.It also had the best discharge capacity,and its discharge capacity at 0.5C,1C,2C,5C,10 C rate was reached 156.93mAh/g,146.73mAh/g,135.85mAh/g,119.02mAh/g and 105.25mAh/g respectively.

关 键 词：磷酸铁 磷酸亚铁锂 碳热还原法 锂离子电池 正极材料 

分 类 号：TM912[电气工程—电力电子与电力传动]