Physical and Electrochemical Properties of LiFePO4/C Composite Cathode Prepared From Aromatic Diketone-Containing Precursors

A systematic study of the relationship between the carbon precursor structure and the discharge capacity in LiFePO4/C composite materials is presented. Knowledge of this relationship may yield composites with improved electrochemical and tailor made properties. To this end, we describe the effects o...

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Bibliographic Details
Published in:International journal of electrochemical science 2010-08, Vol.5 (8), p.1090-1102
Main Authors: Wong, Hong-Chang, Carey, James R., Chen, Jenn-Shing
Format: Article
Language:English
Subjects:
carbon coating
cathode material
coprecipitation
Lithium iron phosphate
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Summary:A systematic study of the relationship between the carbon precursor structure and the discharge capacity in LiFePO4/C composite materials is presented. Knowledge of this relationship may yield composites with improved electrochemical and tailor made properties. To this end, we describe the effects of organic additives with functionalized aromatic diketones on the performance of a LiFePO4/C composite cathode. Described herein, is a coprecipitation method resulting in a series of LiFePO4/C materials by calcinating amorphous LiFePO4 with various structures of diketone additives at 700°C. X-ray diffraction, scanning electron microscopy (SEM), particle size analysis (PSA), thermal analysis, Raman spectral analysis, BET surface area and electrochemical data indicate that aromatic diketones with increasing length of alkoxy chains possess improved capacities compared to other various types of organic reagents. This finding may pave the way for new LiFePO4 materials with enhanced electrochemical properties.
ISSN:1452-3981
1452-3981
DOI:10.1016/S1452-3981(23)15347-8