Transport and Electrochemical Properties of Li_yNi_xMn_2-xO₄ (0.1 ≤ x ≤ 0.5) Cathode Materials

Abstract:

In this paper structural, electrical, electrochemical and thermal (DSC) characterization of series of manganese spinel samples with manganese substituted to different degree (x = 0 – 0.5) with nickel are presented. The conductivity and thermoelectric power measurements were performed in wide temperature range also versus oxygen partial pressure and for deintercalated samples. Electrochemical studies of these cathode materials were conducted in Li / Li+ / LiyNixMn2−xO4 type cells. Substitution of manganese with nickel causes disappearance of the phase transition characteristic of LiMn2O4 spinel. Studies of electrical properties reveal that Ni ions do not participate in charge transport at low temperatures. In the charge curves of Li / Li+/ LiyNixMn2−xO4 cells there are two visible plateaux, separated with distinct potential jump (~0.5V), which position on Li content perfectly matches the Mn3+ content in the doped cathode material. The lower plateau is related to the Mn3+ → Mn4+ oxidation, while the next of higher voltage, of the dopant Ni2+ → Ni4+ oxidation. The schematic diagrams of relative Mn – Ni electronic levels alignment are proposed.

• Periodical: Defect and Diffusion Forum (Volumes 242-244)
• Pages: 65-76
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.242-244.65
• Online since: September 2005
• Authors: J. Molenda, M. Ziemnicki, K. Świerczek, J. Marzec
• Keywords: Cathode Material, Conductivity, Deintercalation, Li Diffusion, Li_yNi_xMn_2-xO₄

References

[1] J.M. Tarascon, W.R. McKinnon, F. Coowar, T.N. Bowmer, G. Amatucci, D. Guyomard, J. Electrochem. Soc. 141 (1994) 1421.

DOI: 10.1149/1.2054941

[2] Y. Shimakawa, T. Numata, J. Tabuchi, J. Solid State Chem. 131 (1997) 138.

[3] A. de Koch, E. Ferg, R.J. Gumuow, J. Power Sources 70 (1998) 247.

[4] Y. Shao-Horn, L.R. Middaugh, Solid State Ionics 139 (2001) 13.

[5] Naoaki Kumagai, Hiroki Ooto, Nobuko Kumagai, J. Power Sources 68 (1997) 600.

[6] E. Iwata, K. Takahashi, K. Maeda, T. Mouri, J. Power Sources 81-82 (1999) 430.

[7] R. Thirunakaran, B. Ramesh Babu, N. Kalaiselvi, P. Periasamy, T. Prem Kumar, N.G. Renganathan, M. Raghavan, N. Muniyandi, Bull. Mater. Sci. Vol. 24 No. 1 (2001) 55.

DOI: 10.1007/bf02373583

[8] J.M. Tarascon, E. Wang, F.K. Shokoohi, W.R. McKinnon, S. Colson, J. Electrochem. Soc. 138 (1991) 2859.

[9] J. Marzec, K. Świerczek, J. Przewoźnik, J. Molenda, D.R. Simon, E.M. Kelder, J. Schoonman, Solid State Ionics 146 (2002) 225.

[10] J. Molenda, K. Świerczek, W. Kucza, J. Marzec, A. Stokłosa, Solid State Ionics 123 (1999) 155.

[11] K. Świerczek, J. Marzec, M. Marzec, J. Molenda, Solid State Ionics 157 (2003) 89.

[12] J. Molenda, W. Ojczyk, M. Marzec, J. Marzec, J. Przewoźnik, R. Dziembaj, M. Molenda, Solid State Ionics 157 (2003) 73.

[13] W. Weppner, R.A. Huggins, J. Electrochem. Soc. 124 (1977) 1569.

[14] Y. Liu, T. Fujiwara, H. Yukawa, M. Morinaga, Solar Energy Materiale & Solar Cells 62 (2000) 163.

[15] J. Molenda, J. Marzec, K. Świerczek, W. Ojczyk, M. Ziemnicki, M. Molenda, M. Drozdek, R. Dziembaj, Solid State Ionics 171 (2004) 215.

[16] 16. J. Molenda, Solid State Ionics 175 (2004) 203.