The development of LiFeO{sub 2}-LiCoO{sub 2}-NiO cathodes for molten carbonate fuel cells
- Argonne National Lab., IL (United States)
The phase relationships in the LiFeO{sub 2}-LiCoO{sub 2}-NiO ternary system were determined and used to find compositions that would reduce the resistivity of LiFeO{sub 2}-containing cathodes to levels low enough for molten carbonate fuel cells. There was no solubility limit in the NiO-LiFeO{sub 2} binary system; a continuous solution was formed. Two regions of homogeneity were found in the LiFeO{sub 2}-LiCoO{sub 2} binary, 0 to 13 and 87 to 100 mol % LiCoO{sub 2}. Similarly, two regions of homogeneity were found in the LiCoO{sub 2}-NiO binary, 0 to 18 and 94 to 100 mol % LiCoO{sub 2}. The resistivities of these materials indicate that addition of Ni and Co to the LiFeO{sub 2} lattice decreases the resistivity from about 300 {Omega} cm to about 1 to 10 {Omega} cm at 650 C. Using both Ni and Co additives together reduces the resistivity of LiFeO{sub 2} and its sensitivity to CO{sub 2} partial pressure. Cell tests indicate that solid solutions LiFeO{sub 2}-LiCoO{sub 2}-NiO system posses electrocatalytic activity. The cell displayed a potential of 0.79 V at 160 mA/cm{sup 2}. The data indicate that LiFeO{sub 2}-LiCoO{sub 2}-NiO cathodes hold promise for fuel-cell cathodes.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 345320
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 146; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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