Structure and Electrochemical Performances of LiFePO4/C Composite Cathode Coating with Different Carbon Sources for Lithium Ion Batteries

Chang Ling Fan; Shao Chang Han; Ling Fang Li; Yong Mei Bai; Ke He Zhang; Jin Chen; Xiang Zhang

doi:10.4028/www.scientific.net/AMR.652-654.865

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 652-654Structure and Electrochemical Performances of...

Structure and Electrochemical Performances of LiFePO₄/C Composite Cathode Coating with Different Carbon Sources for Lithium Ion Batteries

Abstract:

Three kinds of carbon resources, poly(vinyl alcohol), phenol-formaldehyde resin and epoxy resin, were used to prepare the LiFePO₄/C composite (LFPC-1, LFPC-2, LFPC-3). XRD patterns show that the LFPC composites possess the typical olivine structure. The particle size and the reunited degree of LFPC-1 are smaller than those of LFPC-2 and LFPC-3. The discharge capacities of LFPC-1 at different C-rates are also much higher than those of the other two samples. Its discharge capacities at 0.1 C and 1 C are 158.8 mAh g^-1 and 136.20 mAh g^-1. Its discharge curve can maintain the stable potential platform of 3.3 V at the rate of 1 C. LFPC-1 possesses the highest electrical conductivity of 5.76×10^-2 S•cm^-1. This is because the ID/IG value of 1.20 in Raman spectra is much lower than that of LFPC-2 and LFPC-3. The selected area electron diffraction in the TEM of LFPC-1 shows directly that the graphitized carbon is formed on the cover surface of LFPC-1 composite.

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Advanced Materials Research (Volumes 652-654)

Pages:

865-870

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.652-654.865

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Online since:

January 2013

Authors:

Chang Ling Fan, Shao Chang Han, Ling Fang Li, Yong Mei Bai, Ke He Zhang, Jin Chen, Xiang Zhang

Keywords:

Carbon Resources, Electrical Conductivity, Electrochemical Performance, Lithium Iron Phosphate, Lithium-Ion Battery

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