Development of high-performance hydrogen storage alloys for applications in nickel-metal hydride batteries at ultra-low temperature
| Autor: | Chun Cheng Yang, Miao Miao Li, Chang Chun Wang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Alloy Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry Electrochemistry 01 natural sciences Metal Hydrogen storage Nickel–metal hydride battery Electrical and Electronic Engineering Physical and Theoretical Chemistry Renewable Energy Sustainability and the Environment Hydride 021001 nanoscience & nanotechnology 0104 chemical sciences Nickel chemistry Chemical engineering visual_art Electrode visual_art.visual_art_medium engineering 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 491:229585 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2021.229585 |
| Popis: | The main challenge for the applications of nickel-metal hydride (Ni-MH) batteries in low-temperature regions derives from the sluggish kinetics of its negative electrode materials—hydrogen storage alloys (HSAs). Here we design and fabricate a series of Co-free HSAs, exhibiting superior electrochemical reaction kinetics and low-temperature dischargeability performance. One novel candidate, La0.95Y0.05Ni4.5Mn0.4Al0.35, shows the highest discharge specific capacity of 283.5 mAh g−1 among reported data of AB5-type HSAs at a high discharge current density of 3000 mA g−1, which is 4.3 times that of the alloy synthesized with the same composition as a commercial alloy (MmNi3.55Co0.75Mn0.4Al0.3) electrode (65.9 mAh g−1). Moreover, this Co-free La0.95Y0.05Ni4.5Mn0.4Al0.35 alloy electrode can remain a discharge specific capacity of 255.8 mAh g−1 at a low temperature of 233 K while the synthesized MmNi3.55Co0.75Mn0.4Al0.3 alloy electrode shows a specific capacity of only 9.5 mAh g−1. The discharge specific capacity of the above Co-free alloy electrode can reach 30.0 mAh g−1 228 K, making it a promising candidate as a negative electrode material for applications in Ni-MH batteries at ultra-low temperature. |
| Databáze: | OpenAIRE |
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