物理化学学报2012，Vol.28Issue(5)：1183-1188,6.DOI:10.3866/PKU.WHXB201202221
机械活化辅助多元醇法合成锂离子正极材料LiFePO4
Synthesis of LiFePO4 Cathode Materials by Mechanical-Activation-Assisted Polyol Processing
摘要
Abstract
A low-temperature approach for efficient preparation of LiFePO4 was developed. The rod-shaped [Fe3(PO42 · 8H2O + Li3PO4] precursor was prepared, using a mechanochemical liquid-phase activation technique, from LiH2PO4 and reduction iron powder. Pure LiFePO4 was then synthesized in boiling tetra(ethylene glycol) (TEG) by polyol processing with the as-prepared precursor. In order to improve the electrical conductivity, carbon coating of the pure LiFePO4 was carried out, using poly(vinyl alcohol) (PVA) as the carbon source. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). The results show that well-crystallized LiFePO4 was successfully synthesized by polyol processing at low temperature. Carbon coating significantly improves the conductive properties of LiFePO4 and reduces charge-transfer impedance. The obtained LiFePOX composite delivers specific discharge capacities of 139.8 and 129.5 mAh · g-1 at 1C and 2C rates, respectively, displaying good cycling performance and rate capability.关键词
正极材料/LiFePO4/机械活化/多元醇法/碳包覆Key words
Cathode Material, LiFePO4/ Mechanical activation/ Polyol processing/ Carbon coating分类
化学化工引用本文复制引用
曹雁冰,段建国,姜锋,胡国荣,彭忠东,杜柯..机械活化辅助多元醇法合成锂离子正极材料LiFePO4[J].物理化学学报,2012,28(5):1183-1188,6.基金项目
国家科技支撑计划项目(2007BAE12B01),中央高校基本科研业务费专项资金(2012QNZT018)和湖南省科技计划项目(2009GK3150)资助 （2007BAE12B01）
