Microstructures and Electrochemical Hydrogen Storage Properties of La_0.7Ce_0.3Ni_3.83Mn_0.43Co_0.25-xAl_0.26Cu_0.48(Fe_0.43B_0.57)_x Alloys

Abstract:

Microstructures and electrochemical characteristics of La_0.7Ce_0.3Ni_3.83Mn_0.43Co_0.25-x Al_0.26Cu_0.48(Fe_0.43B_0.57)_x hydrogen storage alloys have been investigated. XRD results indicate that La_0.7Ce_0.3Ni_3.83Mn_0.43Co_0.25-xAl_0.26Cu_0.48 alloy is single LiNi₅ phase, and the alloys containing Fe_0.43B_0.57 are composed of LaNi₅ matrix phase and La₃Ni₁₃B₂ secondary phase, and the abundance of the secondary phase gradually increases with increasing Fe_0.43B_0.57 content. Maximum discharge capacity of the alloy electrodes monotonically decreases from 311.2 mAh/g (x = 0) to 289.6 mAh/g (x = 0.20). High-rate dischargeability at the discharge current density of 1200 mA/g first increases from 53.1% (x = 0) to 64.0% (x = 0.15), and then decreases to 56.5% (x = 0.20).

• Periodical: Advanced Materials Research (Volume 721)
• Pages: 59-62
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.721.59
• Online since: July 2013
• Authors: Yu Zhou, Xian Yun Peng, Bao Zhong Liu
• Keywords: Electrochemical Property, Hydrogen Storage Alloy, Ni/MH Batteries, Phase Structure

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