摘要
添加表面活性剂，采用水热法合成正极材料碳包覆的磷酸铁锂（LiFePO4／C），用傅立叶红外光谱（FT-IR）、XRD、热重（TG）、SEM、恒流充放电和电化学阻抗谱等进行分析。制得的LiFePO4／C材料纯度高、粒径小且形貌较规则。使用不同表面活性剂制备的LiFePO4／C颗粒具有不同的形貌和粒径。使用聚乙烯吡咯烷酮（PVP）高分子和聚乙二醇（PEG-400）低分子制备的LiFeP04／C材料，在2．0～4．2V充放电，0．tC首次放电比容量分别为154．1mAh／g和145．6mAh／g；循环24次，0．5c时的容量保持率分别为71％和75％，1．0C时的容量保持率分别为65％和62％。
Cathode material carbon coated lithium iron phosphate（ LiFePO4/C） was prepared by hydrothermal method with surfactant. The morphology, structure and electrochemical performance of the products were characterized by Fourier transform infrared spectroscopy （ FT-IR）, XRD, thermogravimetric （ TG ）, SEM, galvanostatic charge-discharge and electrochemical impedance spectros- copy （EIS）tests. LiFePO4/C samples were small particles with pure phase and regular shape. LiFePOJC particles showed different morphology and grain size when the surfactant changed. LiFePO4/C samples prepared with PVP and PEG-400 could deliver the initial discharge specific capacity of 154. 1 mAh/g and 145.6 mAh/g at 0. 1 C when cycled in 2. 0 - 4. 2 V. When cycle 24 times, the capacity retention at 0. 5 C was 71% and 75% ,respectively,the capacity retention at 1.0 C was 65% and 62% ,respectively.
出处
《电池》
CAS
CSCD
北大核心
2013年第4期207-210,共4页
Battery Bimonthly
基金
江苏省自然科学基金资助项目(BK2009262)
关键词
正极材料
水热法
磷酸铁锂(LiFePO4)
电化学性能
cathode material
hydrothermal method
lithium iron phosphate（ LiFePO4 ）
electrochemical performance
