Hostname: page-component-78c5997874-xbtfd Total loading time: 0 Render date: 2024-11-02T20:58:11.015Z Has data issue: false hasContentIssue false
  • English
  • Français

Preparation and Characterization of LiCoO2 and LiMg0.05Co0.95O2 Thin Films on Porous Ni/NiO Cathodes for MCFC by Complex Sol-Gel Process (CSGP)

Published online by Cambridge University Press:  10 February 2011

W. Lada ,
A. Deptula ,
B. Sartowska ,
T. Olczak ,
A.G. Cimielewski ,
M. Carewska ,
S. Scaccia ,
E. Simonetti ,
L. Giorgi  and
A. Moreno
W. Lada
Affiliation:
Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland, [email protected]
A. Deptula
Affiliation:
Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland, [email protected]
B. Sartowska
Affiliation:
Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland, [email protected]
T. Olczak
Affiliation:
Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland, [email protected]
A.G. Cimielewski
Affiliation:
Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland, [email protected]
M. Carewska
Affiliation:
ENEA, TEA-CCAT, Casaccia Casaccia, AD 00100 Roma, Italy
S. Scaccia
Affiliation:
ENEA, TEA-CCAT, Casaccia Casaccia, AD 00100 Roma, Italy
E. Simonetti
Affiliation:
ENEA, TEA-CCAT, Casaccia Casaccia, AD 00100 Roma, Italy
L. Giorgi
Affiliation:
ENEA, TEA-CCAT, Casaccia Casaccia, AD 00100 Roma, Italy
A. Moreno
Affiliation:
ENEA, TEA-CCAT, Casaccia Casaccia, AD 00100 Roma, Italy, [email protected]
Get access

Abstract

The major disadvantage of Ni/NiO cathodes for a Molten Carbonate Fuel Cells (MCFC) application is dissolution of NiO in K/Li electrolyte that significantly decreases the cell lifetime. Thin films of LiCoO2 or LiMg0.05Co0.9502 were prepared on a cathode body in order to protect them against dissolution. For preparation of starting sols the Complex Sol-Gel Process (CSGP) has been applied. These sols have been prepared by adding of LiOH to aq. acetates solution of Co 2+(Mg2+) with ascorbic acid and then by alkalizing them with aqueous ammonia to pH=8. The cathode plates of various dimensions (to several hundreds cm2) have been dipped in these sols and withdrawn at rate a 1.7 cm/s. Commercially sintered Ni plates were always initially oxidized by heating at various temperatures. Their microstructure and mechanical properties as a function of temperature were observed. Heat treatment should be carried out under the dead load of the ceramic plates in order to avoid their waving. The best non-folded plates were obtained by treating them for lh at 550°C. The covered substrates were calcined for lh at 650°C, using low heating ratel°C/min. The presence of LiCoO2 in a deposited coating has been proved by EDS patterns. The resultant film thicknesses were measured by scanning electron microscopy (SEM) on the fractured cross-sections; they ranged from 0.5 to 2νm and depended on sol concentration and viscosity. A 350 hundred hours test in molten carbonates, proved that the cathode bodies covered with LiCoO2 are completely prevented from dissolution of Ni in a molten K/Li electrolyte. Dissolution of LiCoO2 coating was not observed as well. After treatment in a molten electrolyte SEM observations did not show any changes in microstructures and morphology of the covered cathodes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 623: Symposium U – Materials Science of Novel Oxide-Based Electronics , 2000 , 395
Copyright
Copyright © Materials Research Society 2000

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Yuh, C., Johnsen, R., Farooque, M., Maru, H., Power, J. Sources 56, 1(1995).Google Scholar
2 Joon, K., J. Power Sources, 71, 12 (1998).Google Scholar
3 Dicks, A.L., J. Power Sources, 71, 111 (1998).Google Scholar
4 Fukui, N.T., Okawa, H., Tsunoka, T., J. Power Sources 71, 239 (1998).Google Scholar
5 Belhomme, C., Cassir, M., Tessier, C., Berthoumieux, E., Electrochemical and Solid State Letters, 3, 216 (2000).Google Scholar
6 Lundblad, A., Bergman, B., Fabrication and characterization of LiCoO2 cathode material for MCFC, New Materials for Fuel Cell and Modern Battery Systems II, Editors, Savadogo, O. and Roberge, P.R., ISBN 2-553-00624-1, Montreal, Canada, 1997, p86.Google Scholar
7 Kuk, S.T., Kwon, H.J., Chun, H.S., Kim, K.K., Properties of LiCoO2-coated NiO MCFC Cathode, Fuel Cell Seminar, Orlando, Florida, USA, 1996, Proceedings, p. 367.Google Scholar
8 Chang, H.S.W., Lee, T.J., Lin, S.C., Jeng, J.H., J. Power Sources, 54, 403 (1995).Google Scholar
9 Chen, C.H., Buysman, A. A. J., Kelder, E. M., Schoonman, J., Solid State Ionics, 80, 1(1995).Google Scholar
10 Fragnaud, P., Brouse, T., Schleich, D. M., J. Power Sources 63, 187 (1996).Google Scholar
11 Chen, C. H., Kelder, E. M., Schoonman, J., J. Mat. Sci. 31, 5437 (1996).Google Scholar
12 Lee, J., Lee, S., Baik, H., Lee, H., Wang, S., Lee, S.M., Electrochemical and Solid State Letters, 2, 512 (1999).Google Scholar
13 Antaya, M., Cearns, K., Preston, J.S., Reimers, J.N., Dahn, J.R., J. Appl. Phys, 76, 2799 (1994).Google Scholar
14 Striebel, K.A., Deng, C.Z., Wen, S.J., Cairns, E.J., J. Electrochem. Soc. 143, 1821 (1996).Google Scholar
15 Brinker, C.J., Frye, G.C., Hurd, A.J., Asley, C.S., Thin Solid Films, 201, 97 (1991).Google Scholar
16 Brinker, C.J., Scherer, G.W., Sol-Gel Science, The Physics and Chemistry of Sol-Gel Processing, 1990 (Academic Press, San Diego).Google Scholar
17 Deptula, A., Lada, W., Olczak, T., Lanagan, M., Dorris, S.E., Goretta, K.C., Poeppel, R.B., Method for preparing of high temperature superconductors, Polish Patent No 172618, June 1997. Claimed and valid since October, 29,1993.Google Scholar
18 Deptula, A., Lada, W., Olczak, T., Goretta, K.C., A. Di Bartolomeo, Casadio, S., Sol-Process for preparation of YBa2Cu4O8 from acidic acetate/ammonia/ascorbic acid systems, Mat. Res. Bull, 32, 319 (1997).Google Scholar
19 Deptula, A., Lada, W. Olczak, T., Croce, F., Ronci, F., Ciancia, A., Giorgi, L., Brignocchi, A., ADi Bartolomeo, Synthesis and Preliminary Electrochemical Characterization of LiNi0.5Co0.502 Powders Obtained by the Complex Sol Gel Process (CSGP), MRS Fall'97 Meeting, December 1-5,1997 Boston, USA, Proceedings, Volume 496, Symposium Y: Materials for Electrochemical Energy Storage and Conversion II- Batteries, Capacitors and Fuel Cells, Pittsburg PA, USA, 1998. p. 237–242.Google Scholar
20 Lada, W., Deptula, A., Olczak, T., Torbicz, W., Pijanowska, D., Bartolomeo, A. Di, Preparation Thin Sn02 Layers by Inorganic Sol-gel Process, J. of Sol-Gel Science and Technology, 551 (1994).Google Scholar
21 Orignac, X., Vasconcelos, H.C., Du, X.M., Almeida, R.M., J. of Sol-Gel Science and Technology, 8, 243 (1997).Google Scholar
22 Özer, N., Thin Solid Films, 304, 310(1997).Google Scholar
23 Scaccia, S., Talanta, 49, 467(1999).Google Scholar