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High‐rate Lithium Iron(II) Phosphate as Cathode Material for Rechargeable Lithium Batteries
Author(s) -
ZHAO Ming,
JIAO LiFang,
YUAN HuaTang,
SUN JunLi,
FENG Yan
Publication year - 2008
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200890057
Subject(s) - chemistry , cyclic voltammetry , lithium (medication) , electrochemistry , scanning electron microscope , thermogravimetry , dielectric spectroscopy , lithium iron phosphate , transmission electron microscopy , carbon fibers , aqueous solution , cathode , citric acid , chemical engineering , inorganic chemistry , analytical chemistry (journal) , nuclear chemistry , electrode , composite material , materials science , organic chemistry , composite number , medicine , engineering , endocrinology
High‐rate carbon coated LiFePO 4 was synthesized by citric acid assistant aqueous chemical route employing polyethyleneoxide as the carbon source. The structural and electrochemical properties were intensively investigated by thermogravimetry, powder X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge‐discharge tests. The results of structural tests showed that the material consisted of small LiFePO 4 particles of good phase purity and the particles of the material were coated and connected with approximate 5 wt% incompact porous carbon. The material performed very well in electrochemical measurements, and was suitable for high‐rate charge and discharge. The material exhibited stable discharge capacities of 120, 90 and 60 mAh·g −1 at 5 C, 10 C and 20 C rates respectively (1 C=150 mA·g −1 , charge at 1 C).