Discharge and corrosion behaviors of the α-Mg and β-Li based Mg alloys for Mg-air batteries at different current densities. (15th December 2018)

• Record Type: Journal Article
• Authors: Liu, Xuan; Xue, Jilai; Liu, Shizhe
• Is Part Of: Materials & design. Volume 160(2018)
• Page Start: 138
• Page End: 146
• Publication Date: 2018-12-15
• Subjects: Magnesium alloys -- Mg-air batteries -- Microstructures -- Discharge and corrosion behaviors; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2018.09.011
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: The discharge and corrosion behaviors of the wrought α-Mg and β-Li based Mg alloys at large current densities were investigated in this work. The β-Li phase strongly promotes the power density of Mg based anodes up to 58.9 mW/cm 2 at 80 mA/cm 2, due to the dissolvable discharge product. The α-Mg based alloy suffers significant hydrogen gas evolution. The β-Li phase memorably weakens the hydrogen evolution, due to prior dissolution of β-Li phase. The discharged surface becomes fine and dense after the fast and uniform consumption of the anodes at large current density. The corroded phase transform into particle-like clusters. Furthermore, the fine and dense precipitates play important roles in the spalling behavior of β-Li phase and surface film formation process. The corrosion behaviors connecting discharge properties are also discussed in detail. Graphical abstract: Highlights: The β-Li based alloy has high power density of 58.9 mW/cm 2 at 80 mA/cm 2 . Large current density draws uniform and dense distribution of the corroded phase. The β-Li phase with precipitates play key roles in the formation of surface film.