Synthesis and characterization of LiFePO4/C composite obtained by sonochemical method
作者： D JUGOVIC , M MITRIC , N CVJETICANIN , B JANCAR , S MENTUS
DOI: 10.1016/J.SSI.2008.03.014
关键词:
摘要: Lithium iron phosphate has become of great interest as storage cathode for the next generation rechargeable lithium batteries. Olivine structure LiFePO4/C composite powder was prepared by ultrasound assisted synthesis. A polyvinyl alcohol solution used source an in situ formed carbon. X-ray diffraction confirmed phase purity. data were crystal refinement, based on Rietveld full profile method. All relevant structural and microstructural parameters that could be significant electrochemical intercalation/deintercalation processes determined. The refinement also showed additional electron density sites, indicating 3 at.% site. Electrochemical characteristic evaluated using galvanostatic charge/discharge tests. While cycling at C/3 (C/10) rate discharge capacity increases, starting from value 94.1 (116.0) mAh/g reaching 99.5 (124.0) end cycling. Particle morphology revealed both scanning transmission microscopies. On thin particle edges carbon film with a typical thickness several nanometers can observed, well small agglomerates (typical size < 6 nm) certain spots substrate surface.
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