Enhanced Electrochemical Cycle Stability of RE-Mg-Ni System A2B7-Type Alloys by Melt Spinning and Substituting La with Pr

Hui Ping Ren; Bao Wei Li; Zhong Hui Hou; Xiao Gang Liu; Le Le Chen; Yang Huan Zhang

doi:10.4028/www.scientific.net/AMR.415-417.1603

Paper Titles

In Situ Quaternized Gel Electrolyte for Quasi-Solid-State Dye-Sensitized Solar Cell
p.1586

Preparation and Coagulation Performance of Poly Silicate Aluminium Ferric Boron (PSAFB)
p.1590

Preparation and Photoelectric Properties of Spinel MCr₂O₄ (M = Cu, Ni) Nanopowders
p.1594

Thermodynamics of Phenol Adsorption onto Activated Carbon Fiber
p.1599

Enhanced Electrochemical Cycle Stability of RE-Mg-Ni System A₂B₇-Type Alloys by Melt Spinning and Substituting La with Pr
p.1603

Performance Enhancement of Organic Solar Cells with the LiF/Al Cathode Structure by the Pyromellitic Dianhydride Layer
p.1608

Improvement of the Properties of CuInS₂ Thin Film Prepared in Sulfate System
p.1611

Thermoelectric Properties of Ba_xCo₄Sb₁₂ Prepared by High Pressure and High Temperature
p.1615

Preparation and Properties of Corn Gluten Meal/Poly (Lactic Acid) Composite
p.1620

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 415-417Enhanced Electrochemical Cycle Stability of...

Enhanced Electrochemical Cycle Stability of RE-Mg-Ni System A₂B₇-Type Alloys by Melt Spinning and Substituting La with Pr

Abstract:

It has come to light that the poor electrochemical cycle stability of RE-Mg-Ni based AB₃ and A₂B₇-types electrode alloys limited their practical application as the negative electrode materials of Ni-MH battery. In order to improve the electrochemical cycle stability of the La-Mg-Ni system A₂B₇-type electrode alloys, La in the alloy is partially substituted by Pr and the melt-spinning technology was used for preparing La_0.75−xPr_xMg_0.25Ni_3.2Co_0.2Al_0.1 (x = 0-0.4) electrode alloys. The microstructures and electrochemical cycle stability of the as-cast and spun alloys were investigated. The results obtained by XRD, SEM and TEM show that the as-cast and spun alloys have a multiphase structure which consists of two main phases (La, Mg)₂Ni₇ and LaNi₅ as well as a residual phase LaNi₂. The substitution of Pr for La gives rise to a visible grain refinement of the as-cast alloys instead of changing the phase structure of the alloys. The electrochemical measurement indicates that the cycle stability of the alloy remarkably grows with increasing both Pr content and spinning rate.