Factors Influencing the Quality of Carbon Coatings onLiFePO4

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Several LiFePO4/C composites were prepared and characterizedelectrochemically in lithium half-cells. Pressed pellet conductivitiescorrelated well with the electrochemical performance in lithiumhalf-cells. It was found that carbon structural factors such as sp2/sp3,D/G, and H/C ratios, as determined by Raman spectroscopy and elementalanalysis, influenced the conductivity and rate behavior strongly. Thestructure of the residual carbon could be manipulated through the use ofadditives during LiFePO4 synthesis. Increasing the pyromellitic acid (PA)content in the precursor mix prior to calcination resulted in asignificant lowering of the D/G ratio and a concomitant rise in thesp2/sp3 ratio of the carbon. Addition of both iron nitrate and PAresulted in ... continued below

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Wilcox, James D.; Doeff, Marca M.; Marcinek, Marek & Kostecki,Robert October 11, 2006.

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Several LiFePO4/C composites were prepared and characterizedelectrochemically in lithium half-cells. Pressed pellet conductivitiescorrelated well with the electrochemical performance in lithiumhalf-cells. It was found that carbon structural factors such as sp2/sp3,D/G, and H/C ratios, as determined by Raman spectroscopy and elementalanalysis, influenced the conductivity and rate behavior strongly. Thestructure of the residual carbon could be manipulated through the use ofadditives during LiFePO4 synthesis. Increasing the pyromellitic acid (PA)content in the precursor mix prior to calcination resulted in asignificant lowering of the D/G ratio and a concomitant rise in thesp2/sp3 ratio of the carbon. Addition of both iron nitrate and PAresulted in higher sp2/sp3 ratios without further lowering the D/Gratios, or increasing carbon contents. The best electrochemical resultswere obtained for LiFePO4 processed with both ferrocene and PA. Theimprovement is attributed to better decomposition of the carbon sources,as evidenced by lower H/C ratios, a slight increase of the carbon content(still below 2 wt. percent), and more homogeneous coverage. A discussionof the influence of carbon content vs. structural factors on thecomposite conductivities and, by inference, the electrochemicalperformance, is included.

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  • Journal Name: Journal of the Electrochemical Society; Journal Volume: 154; Journal Issue: 5; Related Information: Journal Publication Date: 2007

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  • Report No.: LBNL--61748
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 918635
  • Archival Resource Key: ark:/67531/metadc887099

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  • October 11, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 8:34 p.m.

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Wilcox, James D.; Doeff, Marca M.; Marcinek, Marek & Kostecki,Robert. Factors Influencing the Quality of Carbon Coatings onLiFePO4, article, October 11, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc887099/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.