在Ar气的保护下,利用磁悬浮感应炉熔炼制备La0.7Mg0.3-xLixNi2.8Co0.5 (x=0.00,0.05,0.10,0.15)合金,并研究Li部分取代Mg对La0.7Mg0.3-xLixNi2.8Co0.5 (x=0.00,0.05,0.10,0.15)合金电化学性能的影响.研究结果发现,合金电极的最大放电容量依次为385 mAh/g(x=0.00)、390 mAh/g(x=0.05)、385 mAh/g(x=0.10)和393 mAh/g(x=0.15),经过100次充放电循环后,合金电极的容量保持率S100从39.7％(x=0.00)增加到42.1％(x=0.05),然后再下降到39.8％(x=0.10)和34.2％(x=0.15),而合金电极在放电电流密度为1200 mA/g的高倍率放电性能HRD1200则从x=0.00的80％逐渐增大到x=0.15的82.8％.这充分说明以Li局部替代Mg,对La-Mg-Ni合金电极的最大放电影响较小,但能提高合金电极的动力学性能,且适量的Li有利于改善合金电极的循环稳定性.
参考文献
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