Effects of annealing on microstructures and electrochemical properties of La0.8Mg0.2Ni2.4Mn0.10Co0.55Al0.10 alloy

• Published in: Journal of rare earths Vol. 26; no. 3; pp. 398 - 401
• Main Author: 宋大卫 王一菁 刘毅 韩树民 焦丽芳 袁华堂
• Format: Journal Article
• Language: English
• Published: Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China%State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China 01.06.2008
• Subjects: 多组分胶; 电气化项目; 相位结构; 金属相; metal hydrides; annealing treatment; phase structure; electrochemical properties; hydrogen storage alloys; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(08)60104-0

The La0.8Mg0.2Ni2.4Mn0.10Co0.55Al0.10 alloy was prepared by induction melting. The structural and morphological characterizations were performed by means of X-ray powder diffraction （XRD） and scanning electron microscopy （SEM）. The electrochemical measurements were performed using LAND and CH/660b electrochemical workstation. The main phases of the alloy were LaNi5 and （La,Mg）Ni3. After annealing, the maximum discharge capacity, cycle stability and high rate dischargeability （HRD） were improved obviously. The maximum discharge capacity reached 373.80 mAh/g （T=1173 K）, the C100/Cmax（%） was 72.63% （T=1173 K）, and the value of HRD reached 51.8% at a discharge current density of 1150 mA/g （T=1173 K）. The cyclic voltammetry （CV） and potentiodynamic polarization were also studied.