Browse > Article
http://dx.doi.org/10.5229/JKES.2010.13.4.246

Surface Treatment of LiFePo4 Cathode Material for Lithium Secondary Battery  

Son, Jong-Tae (Department of Nano Polymer Science and Engineering, Chungju National University)
Publication Information
Journal of the Korean Electrochemical Society / v.13, no.4, 2010 , pp. 246-250 More about this Journal
Abstract
In this study, nano-crystallized $Al_2O_3$ was coated on the surface of $LiFePO_4$ powders via a novel dry coating method. The influence of coated $LiFePO_4$ upon electrochemical behavior was discussed. Surface morphology characterization was achieved by transmission electron microscopy (TEM), clearly showing nano-crystallized $Al_2O_3$ on $LiFePO_4$ surfaces. Furthermore, it revealed that the $Al_2O_3$-coated $LiFePO_4$ cathode exhibited a distinct surface morphology. It was also found that the $Al_2O_3$ coating reduces capacity fading especially at high charge/discharge rates. Results from the cyclic voltammogram measurements (2.5-4.2 V) showed a significant decrease in both interfacial resistance and cathode polarization. This behavior implies that $Al_2O_3$ can prevent structural change of $LiFePO_4$ or reaction with the electrolyte on cycling. In addition, the $Al_2O_3$ coated $LiFePO_4$ compound showed highly improved area-specific impedance (ASI), an important measure of battery performance. From the correlation between these characteristics of bare and coated $LiFePO_4$, the role of $Al_2O_3$ coating played on the electrochemical performance of $LiFePO_4$ was probed.
Keywords
$LiFePO_4$; Dry coating; $Al_2O_3$; Lithium ion battery;
Citations & Related Records
연도 인용수 순위
  • Reference
1 C. Delacourt, P. Poizot, S. Levasseur, and C. Masquelier, 'Size Effects on Carbon-Free LiFePO4 Powderse' Electrochem. Solid-State Lett. 9, A352 (2006).   DOI
2 J. Cho, Y. J. Kim, and B. Park, 'Novel LiCoO2 Cathode Material with Al2O3 Coating for a Li Ion Cell' Chem. Mater. 12, 3788 (2000).   DOI
3 J. T. Son, Electrochem. Solid-State Lett. submitted.
4 S.-W. Oh, S.-H. Park, J.-H. Kim, Y.-C. Bae, and Y.-K. Sun, 'Improvement of electrochemical properties of LiNi0.5Mn1.5O4 spinel material by fluorine substitution' J. Power Sources. 157, 464 (2006).   DOI
5 I. Belharouak, Y.-K. Sun, J. Liu, and K. Amine, 'Li(Ni1/ 3Co1/3Mn1/3)O2 as a suitable cathode for high power applications' J. Power Sources. 123, 247 (2003).   DOI
6 T. Ohzuku and Y. Makimura, 'Layered Lithium Insertion Material of LiCo1/3Ni1/3Mn1/3O2 for Lithium-Ion Batteries' Chem. Lett, 642 (2001).
7 K. Zaghib, A. Mauger, F. Gendon, and C. M. Julien, 'Surface Effects on the Physical and Electrochemical Properties of Thin LiFePO4 Particles' Chem. Mater. 20, 462 (2008).   DOI
8 S. Franger, C. Bourbon, and F. Le Cras, 'Optimized Lithium Iron Phosphate for High-Rate Electrochemical Applications' J. Electrochem. Soc. 151, A1024 (2004).   DOI
9 D. D. MacNeil, Z. Lu, and J. R. Dahn, 'Structure and Electrochemistry of Li[NixCo1–2xMnx]O2 (0 < x < 1/2)' J. Electrochem. Soc. 149, A1332 (2002).   DOI
10 Y. Cui, X. Zhao, and R. Guo, 'Enhanced electrochemical properties of LiFePO4 cathode material by CuO and carbon co-coating' Journal of Alloys and Compounds. 490, 236 (2010).   DOI   ScienceOn
11 J. Barker, M. Y. Saidi, and J. L. Swoyer, 'Lithium Iron(II) Phospho-olivines Prepared by a Novel Carbothermal Reduction Method' Electrochem. Solid-State Lett. 6, 53 (2003).
12 E. M. Bauer, C. Bellitto, M. Pasquali, P. P. Prosini, and G. Righini, 'Versatile Synthesis of Carbon-Rich LiFePO4 Enhancing Its Electrochemical Properties' Electrochem. Solid-State Lett. 7, 85 (2004).
13 P. P. Prosini, D. Zane, M. Pasquali. Z. Chen, and J. R. Dahn, 'Improved electrochemical performance of a LiFePO4-based composite cathode' Electrochim. Acta. 46, 3517 (2001).   DOI
14 A. A. Salah, A. Mauger, K. Zaghib, J. B. Goodenough, N. Ravet, M. Gauthier, F. Gendron, and C. M. Julien, 'Reduction Fe3+ of Impurities in LiFePO4 from Pyrolysis of Organic Precursor Used for Carbon Deposition' J. Electrochem. Soc. 153, A1692 (2006).   DOI
15 Y. G. Wang, Y. R. Wang, E. Hosono, K. Wang, and H. S. Zhou, 'The Design of a LiFePO4/Carbon Nanocomposite With a Core–Shell Structure and Its Synthesis by an In Situ Polymerization Restriction Method' Angew. Chem. Int. Ed. 47, 7641 (2008).
16 D. Choi and P. N. Kumta, 'Surfactant based sol-gel approach to nanostructured LiFePO4 for high rate Li-ion batteries' J. Power Sources. 163, 1064 (2007).   DOI
17 A. M. Andersson, D. P. Abraham, R. Haasch, S. MacLaren, J. Liu, and K. Amine, 'Surface Characterization of Electrodes from High Power Lithium-Ion Batteries' J. Electrochem. Soc. 149, A1358(2002).   DOI