摘要
对比了熔体快淬合金和常规熔铸合金Zr0.9Ti01(Ni,Co,Mn,V)21的微结构和电化学性能.XRD分析表明:熔体快淬合金在退火前后的晶体结构与铸态合金一样,都为面心立方结构,由Laves C15主相组成;随快淬速度的增加,快淬合金中的非晶成份增多.电化学测试表明:快淬合金有较好的活化性能,经6~8次循环即可完全活化,但其最大放电容量较低,小于270 mA.h/g;而退火后的快淬合金需经30次循环才能完全活化,其最大放电容量皆为340 mA@h/g左右,高于铸态合金和退火前的快淬合金;在电流密度为300 mA/g下充放电循环,发现退火后的快淬合金循环稳定性明显高于铸态合金电极,并且随快淬速度增加,循环稳定性越好.
The structure and electrochemical properties of Zr0.9Ti0.1(Ni,Co,Mn,V)2.1 alloys prepared by both the melt-spinning method and the conventional induction melting were investigated. XRD studies showed that Zr0.9Ti0.1(Ni,Co,Mn,V)2.1 alloys at as-cast, melt-spinning and annealing were all the face center cubic structure with Laves C15 phase, and the higher the melt-spinning rate, the more the amorphous content. The electrochemical measurements showed that melt-spinning alloys had better activity, low discharge capacity (<270 mAh/g); but after annealed, the alloys are activated completely with 30 cycles, the capacities about 340 mAh/g were higher than those of the as-cast and melt-spinning alloys; the annealed alloys had better cycle stability than that of the as-cast alloy, and the higher the melt-spinning rate, the more stable the alloy became.
出处
《过程工程学报》
CAS
CSCD
北大核心
2001年第4期408-411,共4页
The Chinese Journal of Process Engineering
基金
国家863计划资助项目(编号: 715-004-0233)