RE贮氢合金充放电过程的原位XRD观测

被引:2
作者
王超群
郑青军
王宁
邢政良
李国勋
机构
[1] 北京有色金属研究总院!北京
关键词
稀土贮氢合金; 充放电过程; 活化; 相结构; XRD原位观测;
D O I
暂无
中图分类号
TM912.2 [碱性蓄电池];
学科分类号
摘要
采用原位X射线衍射 (XRD)观测稀土贮氢合金在初始充放电过程的结构变化。在第 1周期以 1 5 0mA/ g充电 1 6 5min ,贮氢合金的谱线发生宽化 ,但无明显的结构相变 ;在第 2周期充电 1 2h发生α→β转变 ,合金电极处于平台区 ,5 0mA/ g放电至 - 0 .6V时出现新的氢化物相即γ相 ,它是α/ β相界面内应力产生的 ;在第 3周期充电后γ相先是增加 ,然后减少 ,放电后 β相含量减少 ,γ相渐渐消失。稀土贮氢合金在初始几周充放电过程中的相结构转变机制与氢压下的活化机制相似 ,但不完全一样
引用
收藏
页码:94 / 96
页数:3
相关论文
共 7 条
  • [1] Phase transformations of the LaNi5-H2 system. ONO S,NOMURA K,AKIBA E,et al. Journal of the Less common Metals . 1985
  • [2] A new hydride phase of LaNi5-H3. AKIBA E,NOMURA K,ONO S. Journal of the Less common Metals . 1987
  • [3] In situ X-ray diffraction: a useful tool to investigate hydride formation reactions. NOTTEN P H L,DAAMS J L C,DE VEIRMAN A E M,et al. Journal of Alloys and Compounds . 1994
  • [4] Rechargeable hydrogen batteries using rare-earth based hydrogen storage alloys. SAKAI T,YOSHINAGA H,MIYAMURAH,et al. Journal of Alloys and Compounds . 1992
  • [5] Rechargeable hydrogen batteries using rare-earth based hydrogen storage alloys. SAKAI T,YOSHINAGA H,MIYAMURAH,et al. Journal of Alloys and Compounds . 1992
  • [6] A new intermediate hydride in the LaNi5-H2 system studied by in situ X-ray diffractometry. MATSUMOTO T,MATSUSHITA A. Journal of the Less common Metals . 1986
  • [7] Effects af lattice strain on the hysteresis of pressure-composition isotherms for the LaNi5-H2 system. NOMURA K,URUNO H,ONO S. Journal of the Less common Metals . 1985