Abstract
In order to study the effects of PuNi3- and Ce2Ni7-type phase abundance on electrochemical characteristics of La–Mg–Ni-based alloys, four alloys were prepared by powder sintering different molar ratios of LaNi5 alloy to LaMgNi4 alloy (x) (x=0.56, 0.67, 0.74, 0.89). Rietveld refinement analysis showed that when x was 0.56, the alloy had a PuNi3-type single phase structure. While all the other alloys were composed of PuNi3- and Ce2Ni7-type double phases. The peritectic reaction between LaNi5 and PuNi3-type phases accounted for the formation of Ce2Ni7-type phase whose abundance increased with further increasing x. P–C isotherms indicated that all alloys exhibited single plateau, which was due to the similar super-stacking structures of both phases. In addition, the equilibrium pressure gradually rose as the Ce2Ni7-type phase abundance increased. Electrochemical studies showed that the discharge capacity first increased and then decreased with increasing amount of Ce2Ni7-type phase, while higher Ce2Ni7-type phase abundance favored the cycling stability. Besides, the x=0.74 alloy electrode with the ratio of PuNi3- to Ce2Ni7-type phase abundance close to 1:1 possessed superior high rate dischargeability and kinetic performances. This was attributed to more phase boundaries, which provided more tunnels for diffusion of hydrogen atoms.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
