CAJ | 학술논문

用真空熔炼法制备了多种贮氢合金原样,分别经不同温度、时间热处理和保护气氛下球磨处理.改性前后样品晶体结构用SEM和XRD测试进行结构表征,结果表明合金为LaNi_5和LaMg_2Ni_9晶相的复合相,经过热处理的合金颗粒粒径变小针刺变少、分布也相对更均匀.采用LANDAN进行电化学相关测试(电流密度为150mA/g),表明经过热处理使得晶体结构优化,放电容量有显著增加,且经由Al替代Ni的合金容量达到353.7mAh/g,循环50周容量保持率为76.7%,循环100周容量保持率为62.7%,表现出更好的循环稳定性.实验结果表明,无Co替代贮氢合金经热处理后电化学性能有显著提高,有望降低合金材料成本的同时提高材料的环境友好性.
용진공용련법제비료다충저경합금원양,분별경불동온도、시간열처리화보호기분하구마처리.개성전후양품정체결구용SEM화XRD측시진행결구표정,결과표명합금위LaNi_5화LaMg_2Ni_9정상적복합상,경과열처리적합금과립립경변소침자변소、분포야상대경균균.채용LANDAN진행전화학상관측시(전류밀도위150mA/g),표명경과열처리사득정체결구우화,방전용량유현저증가,차경유Al체대Ni적합금용량체도353.7mAh/g,순배50주용량보지솔위76.7%,순배100주용량보지솔위62.7%,표현출경호적순배은정성.실험결과표명,무Co체대저경합금경열처리후전화학성능유현저제고,유망강저합금재료성본적동시제고재료적배경우호성.
In this paper a series of RE_2MgNi_9 hydrogen storage alloys were synthesized by vacuum induction melting method.The products were modified by heat treatment under argon protection for at least 5h at different temperature.The structure of the alloys were tested by SEM and XRD.The electrochemical characteristics of the alloys were tested by LANDAN.The results showed that the heat treated alloys have higher discharge capability which can reach 353.7mAh/g and have a remarkable cycle life.This shows that this new kind hydrogen storage alloy is suit for power battery.