Effects of cerium on the hydrogen absorption-desorption properties of rare earth-Mg-Ni hydrogen-absorbing alloys
| Autor: | Shigekazu Yasuoka, Jun Ishida, Haruyuki Inui, Kyosuke Kishida |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Battery (electricity)
Materials science Hydrogen Renewable Energy Sustainability and the Environment Hydride Inorganic chemistry Alloy Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Cerium Nickel–metal hydride battery chemistry Phase (matter) Desorption engineering Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 346:56-62 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2017.02.008 |
| Popis: | The influence of Ce addition on the phase constitution, microstructure, hydrogen absorption/desorption properties and battery performances of newly developed rare earth (RE)-Mg-Ni hydrogen-absorbing superlattice alloys for negative electrode materials in Ni-metal hydride (MH) batteries were investigated. The partial substitution of RE (La and Nd) with Ce results in a higher discharge performance and a lower cycle life in the battery. The Ce addition greatly affects the phase constitution, which is mainly characterized by increased formation of the AB2 phase (A = RE or Mg and B = Ni or Al). The existence of the AB2 phase is found to accelerate alloy pulverization and oxidation when the alloys are used as negative electrode materials in Ni-MH model cells. The accelerated pulverization and oxidation are considered to be responsible for the observed higher discharge performance and lower cycle life in the batteries, respectively. |
| Databáze: | OpenAIRE |
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