CAJ | 학술논문

采用XRD分析了La0.50Pr0.22Nd0.06Mg0.22(Ni0.84-xCo0.15Al0.01Mox)3.5(x=0.00,0.01,0.02,0.03和0.04)合金的晶体结构,并且系统地研究了合金的气固相储氢特性和电化学性能.结果表明,合金由Ce2Ni7型结构的A2B7主相和少量的具有CaCu5结构的AB5相构成,晶轴比c/a随着Mo含量的增大而增大.合金在吸放氢过程中的熵变AS和焓变△H与AB5型合金的数值相当.合金的电化学容量随Mo含量的增加而减小,由x=0.00时的381.2 mAh/g下降到x=0.01时的379.5 mAh/g,再至x=0.04时合金的容量最大为362.0 mAh/g;合金容量的衰减速率因Mo的掺入而变大,由x=0.00时的-0.23 mAh/(g·次)降为x=0.04时的-0.97 mAh/(g·次);合金的倍率性能在x=0.01时得以改善,改善幅度为4%.研究表明当x≤0.01时不仅保持了合金的高容量,而且改善了合金的高倍率性能.
채용XRD분석료La0.50Pr0.22Nd0.06Mg0.22(Ni0.84-xCo0.15Al0.01Mox)3.5(x=0.00,0.01,0.02,0.03화0.04)합금적정체결구,병차계통지연구료합금적기고상저경특성화전화학성능.결과표명,합금유Ce2Ni7형결구적A2B7주상화소량적구유CaCu5결구적AB5상구성,정축비c/a수착Mo함량적증대이증대.합금재흡방경과정중적적변AS화함변△H여AB5형합금적수치상당.합금적전화학용량수Mo함량적증가이감소,유x=0.00시적381.2 mAh/g하강도x=0.01시적379.5 mAh/g,재지x=0.04시합금적용량최대위362.0 mAh/g;합금용량적쇠감속솔인Mo적참입이변대,유x=0.00시적-0.23 mAh/(g·차)강위x=0.04시적-0.97 mAh/(g·차);합금적배솔성능재x=0.01시득이개선,개선폭도위4%.연구표명당x≤0.01시불부보지료합금적고용량,이차개선료합금적고배솔성능.