Battery electrode materials based on MgCaNi4
| Autor: | J. Ting, R. C. Young, D.S. Easton, J.A. Horton, Y. Li, L. Cantrell, B. S. Chao, Joachim H. Schneibel |
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| Rok vydání: | 2003 |
| Předmět: |
Alkaline earth metal
Materials science Mechanical Engineering Alloy Metallurgy Inorganic chemistry Metals and Alloys Intermetallic chemistry.chemical_element General Medicine Crystal structure engineering.material Electrochemistry Casting Nickel chemistry Transition metal Mechanics of Materials Desorption Battery electrode Materials Chemistry engineering |
| Zdroj: | Journal of Alloys and Compounds. 350:130-135 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/s0925-8388(02)00979-9 |
| Popis: | Quaternary alloys based on MgCaNi4 were prepared by induction-melting of elemental materials. Nickel was partially substituted with several 3d transition metals or Al. Initial electrochemical capacities up to 350 mAh/g were found. However, these capacities decreased rapidly during cycling. Partial substitution of Ca by La improved the cyclic stability. The capacities deduced from desorption isotherms were generally lower than the electrochemical capacities. The reasons for this may be irreversible electrochemical processes. In disagreement with Oesterreicher et al., the MgCaNi4 alloy prepared in this work did not exhibit a single phase C15 (MgCu2) crystal structure. Instead, it exhibited primarily the CaNi5 structure. With suitable quaternary alloying additions, single phase materials could be obtained. In particular, Zn and Cu additions tended to stabilize the CaNi5 structure, whereas Mn, Cr, Fe, Co, and Al additions tended to stabilize the MgCu2 structure. |
| Databáze: | OpenAIRE |
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