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  • 1. Ringuede, Armelle
    et al.
    Wijayasinghe, Athula
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Albin, Valerie
    Lagergren, Carina
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Tillämpad elektrokemi.
    Cassir, Michel
    Bergman, Bill
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Solubility and electrochemical studies of LiFeO2-LiCoO2-NiO materials for the MCFC cathode application2006Inngår i: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 160, nr 2, s. 789-795Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The dissolution of the state-of-the-art lithiated NiO is still considered as one of the main obstacles to the commercialisation of the molten carbonate fuel cell (MCFC). Development of alternative cathode materials has been considered as a main strategy for solving this problem. Ternary compositions of LiFeO2, LiCoO2 and NiO are expected to decrease the cathode solubility while ensuring a good electrical conductivity and electrochemical activity towards the oxygen reduction. In this work, new material compositions in the LiFeO2-LiCoO2-NiO ternary system were synthesised using Pechini method and investigating their electrical conductivity by the DC four probe method. Then the influence of the cobalt content in the composition was determined in terms of AC impedance analysis and solubility measurements after 200 h of immersion in Li2CO3-Na2CO3 at 650 degrees C. The DC electrical conductivity study reveals the ability of improving the electrical conductivity, adequate for MCFC cathode application, by controlling the Co content of the composition. A special attention was given to the evolution of the open circuit potential as a function of time and to the impedance spectroscopy characterization related to microstructure modifications. Taking into account solubility, electrical conductivity, as well as electrochemical performance in the fuel cell, this study reveals the possibility of using LiFeO2-LiCoO2-NiO ternary materials for MCFC cathode.

  • 2.
    Wijayasinghe, Athula
    KTH, Tidigare Institutioner, Materialvetenskap.
    Development and Characterisation of Cathode Materials for the Molten Carbonate Fuel Cell2004Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Among the obstacles for the commercialization of the MoltenCarbonate Fuel Cell (MCFC), the dissolution of thestate-of-the-art lithiated NiO cathode is considered as aprimary lifetime limiting constraint. Development ofalternative cathode materials is considered as a main strategyfor solving the cathode dissolution problem. LiFeO2and LiCoO2had earlier been reported as the most promisingalternative materials; however, they could not satisfactorilysubstitute the lithiated NiO. On the other hand, ternarycompositions of LiFeO2, LiCoO2and NiO are expected to combine some desirableproperties of each component. The aim of this work was todevelop alternative cathode materials for MCFC in the LiFeO2-LiCoO2-NiO ternary system. It was carried out byinvestigating electronic conductivity of the materials, firstin the form of bulk pellets and then in ex-situ sinteredporous-gas-diffusion cathodes, and evaluating theirelectrochemical performance by short-time laboratory-scale celloperations.

    Materials in the LiFeO2-NiO binary system and five ternary sub-systems,each with a constant molar ratio of LiFeO2:NiO while varying LiCoO2content, were studied. Powders withcharacteristics appropriate for MCFC cathode fabrication couldbe obtained by the Pechini method. The particle size of LiFeO2-LiCoO2-NiO powders considerably depends on thecalcination temperature and the material composition. Theelectrical conductivity study reveals the ability of preparingLiFeO2-LiCoO2-NiO materials with adequate electricalconductivity for MCFC cathode application.

    A bimodal pore structure, appropriate for the MCFC cathode,could be achieved in sintered cathodes prepared usingporeformers and sub-micron size powder. Further, this studyindicates the nature of the compromise to be made between theelectrical conductivity, phase purity, pore structure andporosity in optimization of cathodes for MCFC application. Cellperformance comparable to that expected for the cathode in acommercial MCFC could be achieved with cathodes prepared from20 mole% LiFeO2- 20 mole% LiCoO2- 60 mole% NiO ternary composition. It shows aniR-corrected polarization of 62 mV and a iR-drop of 46 mV at acurrent density of 160 mAcm-2at 650 °C. Altogether, this study revealsthe possibility of preparing LiFeO2-LiCoO2-NiO cathode materials suitable for MCFCapplication.

    Keywords: molten carbonate fuel cell (MCFC), MCFC cathode,LiFeO2-LiCoO2-NiO ternary compositions, electrical conductivity,porous gas diffusion electrodes, polarization, electrochemicalperformance, post-cell characterization.

  • 3.
    Wijayasinghe, Athula
    et al.
    KTH, Tidigare Institutioner, Materialvetenskap.
    Bergman, Bill
    KTH, Tidigare Institutioner, Materialvetenskap.
    Lagergren, Carina
    KTH, Tidigare Institutioner, Kemiteknik.
    A study on LiCoO2-rich cathode materials for the MCFC based on the LiCoO2-LiFeO2-NiO ternary system2004Inngår i: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 49, nr 26, s. 4709-4717Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A study performed in LiCoO2-rich LiCoO2-LiFeO2-NiO ternary materials for the molten carbonate fuel cell (MCFC) cathodes is reported in this paper. LiCoO2-LiFeO2-NiO ternary materials are considered as more viable alternatives to lithiated NiO, however, the work reported so far has mainly been focused on ternary compositions rich in LiFeO2 or NiO. The present work was carried out by investigating the electrical conductivity and microstructural characteristics of the new materials first in the form of bulk pellets and then in ex situ sintered porous-gas-diffusion (PGD) cathodes. The material study reveals the ability of preparing LiCoO2-LiFeO2-NiO ternary compositions with adequate electrical conductivity by controlling the LiCoO2 content. A bimodal pore structure, appropriate for the MCFC cathode, could be achieved in sintered cathodes prepared with fine powders and pore formers. Further, the cathode fabrication study indicates the nature of the compromise to be made between the electrical conductivity, phase purity, pore structure and porosity in optimization cathodes for MCFC application. The study shows the possibility of preparing LiCoO2-rich LiCoO2-LiFeO2-NiO cathodes with promising electrical and pore structural characteristics for the MCFC.

  • 4.
    Wijayasinghe, Athula
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Keramteknologi.
    Lagergren, Carina
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Tillämpad elektrokemi.
    Bergman, Bill
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Keramteknologi.
    LiFeO2-LiCoO2-NiO cathodes for molten carbonate fuel cells2005Inngår i: / [ed] Pierre Taxil, Catherine Bessada, Michel Cassir, Marcelle Gaune-Escard, 2005, s. 425-429Konferansepaper (Annet vitenskapelig)
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