Electrochemical Properties of Natural and Modified Pyrite

Abstract:

Pyrite utrafine powder was yielded through processing natural pyrite, including gravity separation, flotation and airflow grinding, which the contents of Fe and S are 45.30wt% and 50.95wt% respectively and the mean grain size is 13μm. Pyrite powder modified by fatty acid salt A was investigated by TG/DSC, XPS and XRD. The results indicate that the phase of powder is mostly pyrite FeS₂ coating with organic modifier, and S exists in the form of [S₂]^2- principally on modified pyrite surface. Furthermore, electrochemical impedance spectroscopy, cyclic voltammetry measurement and galvanotactic current charge and discharge methods were applied to exhibit the electrochemical performance of pyrite sample. The results show that modified pyrite has lower charge transfer resistance and higher conductivity than that of natural pyrite, and the specific discharge capacity is as high as 850mAh/g under 0.354A current at room temperature and the cutoff of 0.5V closing to the theoretical specific capacity of pyrite (890mA•h/g), and the voltage plateau is 1.44V.

• Periodical: Advanced Materials Research (Volumes 554-556)
• Pages: 379-384
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.554-556.379
• Online since: July 2012
• Authors: Da Gang Wang, Li Ren Fan, Chou Fan
• Keywords: Cathode Material, Electrochemical Performance, Modification, Pyrite

References

[1] V.L. Tauson, R.G. Kravtsova, V.L. Grebenshchikova, et al: Geochem. Int. Vol. 3 (2009), p.232.

[2] I. Uhlig, R. Szargan, H.W. Nesbitt, et al: Appl. Surf. Sci. Vol. 1-4 (2001), p.222.

[3] E. Strauss,S. Calvin, H. Mehta, et al: Solid State Ionics, Vol. 1-2 (2003), p.53.

[4] S.H. Yang and Q.C. Horn: Electrochim. Acta Vol. 17 (2001), p.2615.

[5] G.U. Von Oertzen, W.M. Skinner and H.W. Nesbitt: Phys. Rev. B Vol. 23 (2005), p.342.

[6] S.H. Yang, S. Osmialowski and Q.C. Horn: J. Electrochem. Soc. Vol. 11 (2002), p. A1450.

[7] H. Sahan, H. Goktepe, S. Patat, et al: Solid State Ionics Vol. 35-36 (2008), p.1837.

[8] Z.Y. Tang, Y. Cui, J.J. Xue, et al: Trans. Tianjin Univ. Vol. 1 (2006), p.42.

[9] E. Strauss, D. Golodnitsky and E. Peled: Electrochem. Solid-State Lett. Vol. 3 (1999), p.115.

[10] U. Ibezim-Ezeani Millicent and C.I. Anusiem Alphonso: E-J. Chem. Vol. 4 (2010), p.1491.

[11] P. Brault, P. Ranson, H. Estradeszwarckopf, et al: J. Appl. Phys. Vol. 4 (1990), p.1702.

[12] P. Dedonato, C. Mustin, R. Benoit, et al: Appl. Surf. Sci. Vol. 1 (1993), p.81.

[13] Y.L. Mikhlin and A.S. Romanchenko: Geochim. Cosmochim. Acta Vol. 24 (2007), p.5985.

[14] S. Mattila, J.A. Leiro and M. Heinonen: Surf. Sci., (2004), p.1097.

[15] J.F. Moudler, W.F. Stickle, P.E. Sibol, et al, in: Handbook of X-ray Photoelectron Spectrocopy, edtied by Perkin-Elmer Publishin, Eden Prairie, MN(1992).

[16] Y.M. Bai, P. Qiu, Z.L. Wen, et al: The Chinese Journal of Nonferrous Metals Vol. 8 (2010), p.1572. (In Chinese)

[17] R. Fong, J.R. Dahn and C.H.W. Jones: J. Electrochem. Soc. Vol. 11 (1989), p.3206.

[18] X.M. Liu, X.Y. Wang, W. Wu, et al: The Chinese Journal of Nonferrous Metals Vol. 2 (2010), p.287. (In Chinese)