摘要
研制了5个LaNi5型贮氢合金试样,分别对5种合金试样电极的电化学放电容量、高倍率充放电和宽温度范围内充放电性能、循环稳定性及其相结构进行了测试和分析。结果表明:Sn及Si的搀杂增加了合金的非化学计量比,稳定了合金的循环稳定性并改善了合金的高倍率充放性能;合金样(Ml0.90Nd0.10)Ni3.60Co0.50Mn0.40Al0.18Si0.42的容量较高,5C充电效率大于95%,5C放电效率大于90%,400次充放循环后容量保持率大于70%;所设计合金晶型均为CaCu5相,充放电循环后合金主相仍是CaCu5相,同时发生氧化和粉化现象。
Five LaNi(5)-type hydrogen storage alloys were prepared. Their electrodes' discharge capacity, high rate charge-discharge ability, temperature effect, crystal structure and cycling stability were investigated. The XRD results indicated that alloys examined in this work seem to be of single phase with the hexagonal CaCU(5)-type crystal structure. After 400 charge-discharge cycles, the same crystal structure remained, for some of oxides, for instance, Mm(OH)(3) and La(OH)(3); The composition of stannum or silicon stabilizes the cycle life and improves the high rate charge-discharge abilities of their electrodes; The electrochemical capacity of sample (Ml(0.90)Nd(0.10))Ni(3.60)Co(0.50)Mn(0.40)Al(0.18)Si(0.42) is above 290.72 mAh.g(-1), with capacity preserving being above 70% after 400 charge-discharge cycles. Its 5C rate charge efficiency is higher than 95%, and 5C rate discharge efficiency higher than 90%. It also performs well at various operating temperatures.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2004年第1期15-18,共4页
Rare Metal Materials and Engineering
基金
Project(2001AA501433) Supported by the National High Technology Research Foundation of China
关键词
镍氢电池
贮氢合金
高倍率充放电性能
Ni-MH battery
hydrogen storage alloy
high-rate charge-discharge ability
