摘要
研究了（TiZr0.35）（V0.5Mn1.1-xCr0.4Nix）（x=0.7～1.0）贮氢合金的相结构及电化学性能。XRD及SEM分析表明：合金主要由具有六方结构的C14型Laves相和TiNi基第二相组成,随着Ni含量x的增加,合金晶胞体积逐渐变小,C14型Laves主相含量逐渐增多。电化学测试结果表明：随着Ni含量x的增加,合金的高倍率放电性能及循环稳定性均得到显著改善;合金的贮氢容量随着Ni替代量的增加而先增后减,当x=0.9时,达到最大电化学容量404mAh/g。
The phases composition and electrochemical properties of （TiZr0.35） （V0.5Mn1.1-xCr0.4Nix） （x=0.7～1.0） hydrogen storage alloys have been investigated systematically. XRD and SEM observations show that all the alloys consist of C14 Laves main phase and TiNi-based secondary phase. The content of main phase increases and the lattice parameters of main phase decrease with Ni content increasing. Electrochemical measurements results show that the high-rate-discharge capability and the cycling stability are noticeably improved as the Ni content increases. It is found that the maximum discharge capability of 404 mAh/g has been got for the alloy when x = 0.9.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第5期808-811,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金资助项目(50525101)
关键词
贮氢合金
元素替代
合金相结构
电化学性能
hydrogen storage alloy
elements substitution
phase composition
electrochemical property
