Phase structures and electrochemical properties of La–Mg–Ni-based hydrogen storage alloys with superlattice structure. (26th November 2016)

• Record Type: Journal Article
• Authors: Liu, Jingjing; Han, Shumin; Li, Yuan; Zhang, Lu; Zhao, Yumeng; Yang, Shuqin; Liu, Baozhong
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 44(2016)
• Page Start: 20261
• Page End: 20275
• Publication Date: 2016-11-26
• Subjects: Hydrogen storage alloy -- Nickel/metal hydride battery -- La–Mg–Ni-based electrode material -- Superlattice structure -- Electrochemical property; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.08.149
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: La–Mg–Ni-based alloys with unique superlattice structures emerged as one of the most promising negative electrode materials for Ni/MH batteries because of their high discharge capacity, energy density and rate capability. They usually contain multiphase structures, and the phase composition plays a significant role in determining their electrochemical performance. This review aims to summarize the latest progresses in studying the phase composition and electrochemical properties of La–Mg–Ni-based alloys, thus to provide guidance for further studies, design and optimization of related negative electrode materials for Ni/MH power batteries. The review starts with the structural characteristics of the superlattice alloy phases in La–Mg–Ni-based alloys. Subsequent emphases are placed on the variations in phase composition of La–Mg–Ni-based alloys induced by different heat treatment procedures and elemental compositions, followed by the next two parts in which the electrochemical characteristics of AB3 -, A2 B7 - and A5 B19 -type single-phase alloys are summarized, and the effects of phase composition and microstructure on the electrochemical properties are illustrated. Finally, perspectives and challenges in regard of the rational design and electrochemical improvement of La–Mg–Ni-based alloys as high-performance negative electrode materials for Ni/MH batteries are discussed. Highlights: The latest study progress in La–Mg–Ni-based hydrogen storage alloys is reviewed. Influential rules of preparation and elements on phase transformation are discussed. Design theory and method of single-phase La–Mg–Ni-based alloys are summarized. Effects of different alloy phases on the electrochemical performance are analyzed. Challenges in further improvement of La–Mg–Ni-based alloys are proposed.