摘要
采用电化学测试技术、X 射线衍射等技术研究了 Ti0.8Zr0.2V1.6Mn0.8- CrxNi0.6 (0≤x≤0.64) 贮氢电极合金 x的结构和电化学放电特性。研究表明:合金由 C14 Laves 相和 BCC 相构成;铬替代锰的量越多,枝晶组织越粗大。X 射线衍射发现替代影响合金的晶格参数。合金的最大电化学放电容量为 545 mAh/g,电化学活化容易,但循环性能比较差。随着替代量增大,由于铬抑制了钛、锆和钒元素的表面迁移和氧化使合金的循环性能退化明显减轻,但同时因为替代使晶胞过大导致最大电化学放电容量有所降低。
The structure and discharge characteristics of Ti0.8Zr0.2V1.6Mn0.8-xCrNi0.6 (0less than or equal toxless than or equal to0.64) hydrogen storage annealed electrodes were studied by use of electrochemical techniques, XRD. The results show that the alloys is composed of BCC phase and C14 Laves phase. As increase of the quantity of substitution of chromium for manganese, the dendrite formation become coarser. The XRD reveals that substitution of Cr for Mg can expand the parameters of lattice of the alloy. The maximal discharge capacity of the alloy is 545 mAh/g. The electrochemical activation of alloys is very easy but the cycle property is rather poor. As increase of the quantity of substitution of chromium for manganese, the cycle property deterioration clearly decreases due to the suppression of surface segregation of Ti, Zr and V, but the maximal capacity decreases apparently too, which is attributed to the rather larger crystal cell.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2004年第12期1308-1311,共4页
Rare Metal Materials and Engineering
基金
国家"863"计划资助项目(863-715-004-0060)
