CAJ | 학술논문

系统研究了贮氢电极合金La0.7Mg0.3Ni2.65Co0.75Mn0.1Al0.2B,x(x=0,0.02,0.04,0.08)的微结构与电化学性能.XRD结果显示,所有合金均由(La,Mg)Ni3相与LaNi5相组成,B含量的增加导致(La,Mg)Ni,3相的丰度不断增加,相应地LaNi5相的丰度逐渐下降.此外,合金的晶格参数与晶胞体积均随B含量的增加而减小.电化学测试分析表明,B的添加可以显著改善合金电极的高倍率放电性能,当B含量为0.04时达到最佳.微量B的加入对合金的循环稳定性能与活化性能影响很小,但降低合金电极的最大放电容量.此外还采用线性极化与阳极极化对合金电极的动力学性能进行了进一步研究.
계통연구료저경전겁합금La0.7Mg0.3Ni2.65Co0.75Mn0.1Al0.2B,x(x=0,0.02,0.04,0.08)적미결구여전화학성능.XRD결과현시,소유합금균유(La,Mg)Ni3상여LaNi5상조성,B함량적증가도치(La,Mg)Ni,3상적봉도불단증가,상응지LaNi5상적봉도축점하강.차외,합금적정격삼수여정포체적균수B함량적증가이감소.전화학측시분석표명,B적첨가가이현저개선합금전겁적고배솔방전성능,당B함량위0.04시체도최가.미량B적가입대합금적순배은정성능여활화성능영향흔소,단강저합금전겁적최대방전용량.차외환채용선성겁화여양겁겁화대합금전겁적동역학성능진행료진일보연구.
The structural and electrochemical properties of Lao.7Mg0.3Ni2.65Co0.75Mn0.1Al0.2Bx (x=0-0.08) hydrogen storage electrode alloys were investigated systematically. The results from XRD show that all of the alloys consist of a (La, Mg)Ni3 phase and a LaNi5 phase. With the increase of B content, the abundance of the (La, Mg)Ni3 phase increases, accordingly that of the LaNi5 phase decreases, and the cell volumes of the two phases decrease. Electrochemical studies indicate that B addition can effectively improve the high rate dischargeability (HRD) of the alloy electrode, and the optimal value of HRD1000 reaches 57.1% as x being 0.04. With the addition of small amount of B, the cycling stability and activation properties of the alloy electrodes keep almost unchanged, but the maximum discharge capacity (Cmax) decreases. In addition, the electrochemical kinetics investigations including the linear polarization and anodic polarization were also performed in detail.