文章摘要
李家丞,徐凡,游经纬,叶珊,郭进,蓝志强.La0.7Mg0.3-xLixNi2.8Co0.5(x=0.00,0.05,0.10,0.15)合金制备与电化学性能的研究[J].材料导报,2016,30(14):29-33
La0.7Mg0.3-xLixNi2.8Co0.5(x=0.00,0.05,0.10,0.15)合金制备与电化学性能的研究
Preparations and Study on the Electrochemical Performance of La0.7Mg0.3-xLixNi2.8Co0.5(x=0.00,0.05,0.10,0.15) Alloys
  
DOI:10.11896/j.issn.1005-023X.2016.14.007
中文关键词: 储氢合金 储氢性能 电化学性能 循环稳定性
英文关键词: hydrogen storage alloy, hydrogen storage characteristic, electrochemical property, cyclic stability
基金项目:国家自然科学基金(51271061;51571065);广西教育厅科研基金(2013YB006);广西大学科研基金(XBZ120574)
作者单位
李家丞 广西大学物理科学与工程技术学院,广西高校新能源材料及相关技术重点实验室, 南宁 530004 
徐凡 广西大学物理科学与工程技术学院,广西高校新能源材料及相关技术重点实验室, 南宁 530004 
游经纬 广西大学物理科学与工程技术学院,广西高校新能源材料及相关技术重点实验室, 南宁 530004 
叶珊 广西大学物理科学与工程技术学院,广西高校新能源材料及相关技术重点实验室, 南宁 530004 
郭进 广西大学物理科学与工程技术学院,广西高校新能源材料及相关技术重点实验室, 南宁 530004 
蓝志强 广西大学物理科学与工程技术学院,广西高校新能源材料及相关技术重点实验室, 南宁 530004 
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中文摘要:
      在Ar气的保护下,利用磁悬浮感应炉熔炼制备La0.7Mg0.3-xLixNi2.8Co0.5(x=0.00,0.05,0.10,0.15)合金,并研究Li部分取代Mg对La0.7Mg0.3-xLixNi2.8Co0.5(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。
英文摘要:
      La0.7Mg0.3-xLixNi2.8Co0.5(x=0.00,0.05,0.10,0.15) alloys were prepared by magnetic levitation melting under an argon atmosphere, and the effects of partial substitution of Li for Mg on the electrochemical perfor-mance of La0.7Mg0.3-xLixNi2.8Co0.5(x=0.00,0.05,0.10,0.15) alloys were investigated. The results indicated the maximum electrochemical discharge capacity was 385 mAh/g(x=0.00), 390 mAh/g (x=0.05), 385 mAh/g (x=0.10) and 393 mAh/g (x=0.15), respectively. Furthermore, at the discharge rate of 1200 mA/g, the high rate dischargeability (HRD1200) was improved and it increased from 80% (x=0.00) to 82.8% (x=0.15) as increasing Li content. While for the cycling stability, the capacity retention ratio S100 of the alloy enhanced from 39.7% (x=0.00) to 42.1% (x=0.05) and then reduced to 39.8% (x=0.10) and 34.2% (x=0.15), after 100 charge-discharge cycles. These suggest that the impact of partial substitution of Li for Mg on discharge capacity of La-Mg-Ni alloys is not obvious, but the electrochemical performance of La-Mg-Ni-based alloys can be improved by substituting appropriate Li content for Mg.
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