物理化学学报Issue(5)：866-872,7.DOI:10.3866/PKU.WHXB201403041
真空辅助法合成Fe3（PO4）2∙8H2O及对LiFePO4/C结构、形貌和电化学性能的影响
Vacuum-Assisted Synthesis of Fe3(PO4)2∙8H2O and Its Influence on Structure, Morphology and Electrochemical Performance of LiFePO4/C
摘要
Abstract
A vacuum-assisted precipitation method was used to synthesize Fe3(PO4)2∙8H2O (FP). The FP was then used to synthesize carbon-coated LiFePO4 (LFP/C) particles. The influence of FP on the structure, morphology, and electrochemical performance of LFP was investigated. The X-ray diffraction (XRD) patterns and molar ratio of Fe to P showed that the FP which was produced using a vacuum-assisted method was of high purity and gave highly crystal ine, impurity-free LFP. Scanning electron microscopy (SEM) showed that the FP contained undeveloped particles. The undeveloped FP results in uniform LFP/C particles, without agglomeration. Transmission electron microscopy (TEM) showed that the LFP particles were coated with a homogeneous carbon layer. The LFP/C showed excellent discharge capacities of 140, 113, and 100 mAh∙g-1 at 1C, 10C, and 20C rates, respectively. The cyclic voltammograms (CVs) of LFP showed a low polarization voltage and sharp redox peaks. The charge-discharge platform curves showed that LFP had an excellent high-rate capability. Electrochemical impedance spectroscopy (EIS) tests showed that the lithium-ion diffusion coefficients of LFP/C produced with and without vacuum assistance were 1.42×10-13 and 4.22×10-14 cm2∙s-1, respectively,proving that vacuum assistance can improve the diffusion coefficients of LFP/C.关键词
Fe3(PO4)2∙8H2O/LiFePO4/C/真空辅助/沉淀/高倍率Key words
Fe3(PO4)2∙8H2O/LiFePO4/C/Vacuum-assistance/Precipitation/High rate分类
化学化工引用本文复制引用
任建新,胡有坤,郭孝东,唐艳,钟本和,刘恒..真空辅助法合成Fe3（PO4）2∙8H2O及对LiFePO4/C结构、形貌和电化学性能的影响[J].物理化学学报,2014,(5):866-872,7.基金项目
The project was supported by the Fund for Young Scientists of Sichuan University, China (2011SCU11081) and Research Fund for the Doctoral Program of Higher Education, Ministry of Education of China (20120181120103).四川大学青年基金(2011SCU11081)及教育部高校博士学科点科研基金(20120181120103)资助项目 （2011SCU11081）
