An Investigation on the Electrochemical Cycle Stability of La0.75−xZrxMg0.25Ni3.2Co0.2Al0.1 (x = 0-0.2) Alloys Prepared by Melt Spinning

Yang Huan Zhang; Xiao Gang Liu; Le Le Chen; Hui Ping Ren; Ying Cai; Dong Liang Zhao

doi:10.4028/www.scientific.net/AMR.415-417.1683

Paper Titles

Preparation of Cationic Rice Husk Flocculant and its Flocculating Characteristics
p.1667

Preparation and Performances of Amino-SiO₂ Filled Cellulose Film
p.1671

Decolorization of Coking Wastewater by Mineral Adsorbents
p.1675

Phase and Electrical Properties of [Li_0.065(Na_0.535K_0.48)_0.95]NbO₃ Lead-Free Piezoelectric Ceramics Sintered at Low Temperature
p.1679

An Investigation on the Electrochemical Cycle Stability of La_0.75−xZr_xMg_0.25Ni_3.2Co_0.2Al_0.1 (x = 0-0.2) Alloys Prepared by Melt Spinning
p.1683

Electrochemical Performance of LiFePO₄/C Positive-Electrode Material Prepared via a Rheological Phase Method
p.1689

Comparison Proximate Analysis and Heating Value between Cassava Rhizome and Perennial Wood
p.1693

Experimental Research on Hydrogen Storage Characteristics of TBAB Hydrates
p.1697

Experimental Study on the Optimal Thickness of Infiltration Media of the CRI System
p.1703

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 415-417An Investigation on the Electrochemical Cycle...

An Investigation on the Electrochemical Cycle Stability of La_0.75−xZr_xMg_0.25Ni_3.2Co_0.2Al_0.1 (x = 0-0.2) Alloys Prepared by Melt Spinning

Abstract:

In order to improve the electrochemical cycle stability of the La-Mg-Ni system A₂B₇-type electrode alloys, La in the alloy was partially substituted by Zr. The melt-spinning technology was used for preparing La_0.75−xZr_xMg_0.25Ni_3.2Co_0.2Al_0.1 (x = 0, 0.05, 0.1, 0.15, 0.2) electrode alloys. The influences of both the substitution of Zr for La and the melt spinning on the structures and the electrochemical cycle stability of the alloys were investigated in detail. The structure analysis of XRD, SEM and TEM reveals that the as-cast and spun alloys have a multiphase structure, composing of two main phases (La, Mg)₂Ni₇ and LaNi₅ as well as a residual phase LaNi2. The substitution of Zr for La facilitates to form a like amorphous structure in the as-spun alloy without altering the structures of two major phases. The electrochemical measurement indicates that both the substitution of Zr for La and the melt spinning remarkably improves cycle stability of the alloys. The capacity retaining rate (S₁₀₀) of the Zr_0.2 alloy at 100th charging/discharging cycle is enhanced from 76.69 to 85.18% by growing spinning rate from 0 (as-cast was defined as the spinning rate of 0 m/s) to 30 m/s. And that of the as-spun (10 m/s) alloys is increased from 69.25 to 83.09% by rising Zr content from 0 to 0.2.