稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2015年
7期
783-790
,共8页
赵汪%蒋利军%武媛方%叶建华%袁宝龙%李志念%刘晓鹏%王树茂
趙汪%蔣利軍%武媛方%葉建華%袁寶龍%李誌唸%劉曉鵬%王樹茂
조왕%장리군%무원방%협건화%원보룡%리지념%류효붕%왕수무
hydrogen storage materials%Li-Mg-B-N-H hydride%LaNi4.5Mn0.5%cycle performance%rare earths
The isothermal desorption kinetics of the 1.1MgH2-2LiNH2-0.1LiBH4 system were improved by addition of LaNi4.5Mn0.5 alloy. The hydrogen desorption peak temperature of the sample containing LaNi4.5Mn0.5 reduced by approximately 5 K and the acti-vation energy reduced by 9%. The results of isothermal dehydrogenation kinetics analysis implied that the isothermal desorption process at initial stage was controlled by the phase boundary mechanism. Moreover, the cycle performance of the materials was ex-tended. The growth and agglomeration of the sample particles caused the deterioration of kinetics during de-/hydrogenation cycles, and then resulted in an incomplete desorption/absorption reaction which were responsible for the capacity fading. The cracking and pulverization of LaNi4.5Mn0.5 alloy had an obvious effect on preventing the composites aggregating, and the fine alloy particles could enhance the catalytic effect of the alloy, thus effectively offsetting part of the deterioration of kinetics caused by particles growth.
