NDLI: Effects of particle size and carbon coating on electrochemical properties of LiFePO$

Content Provider	Springer Nature Link
Author	Chang, Yung Chang Peng, Chien Tang Hung, I Ming
Copyright Year	2014
Abstract	In this study, well-crystallized phase pure LiFePO$_{4}$/C (LFP/C) powders were synthesized using the hydrothermal reaction method. To improve the electronic conductivity of the LFP/C powder after ball-milling, the LFP/C powders were double-coated with carbon. Scanning electron microscopy and transmission electron microscopy were employed to observe the micromorphology of the samples and the carbon coating, which was analyzed using Raman spectroscopy. Furthermore, the electrochemical properties were evaluated using cyclic voltammetry, electrochemical impedance spectra, and the charge–discharge cycling test. The ball-mill and the process for double-coating carbon decrease the particle size and increase the conductivity of the LFP/C, thereby reducing the Li-ion diffusion length and improving the reversibility of the Li-ion intercalation/de-intercalation in the LFP/C crystallites. The capacity of the small-particle LFP/C with the double-layer carbon coating was 133 mAh/g at 0.1 °C, and remained at 83 mAh/g as the charge–discharge rate increased to 10 °C. In addition, good cycle stability was observed, with a retention rate of 98 % after 50 cycles at 1 °C.
Starting Page	6907
Ending Page	6916
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	49
Issue Number	20
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2014-07-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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