Preparations and study on the electrochemical performance of La0.7Mg0.3-xLixNi2.8Co0.5(x=0.00, 0.05, 0.10, 0.15) alloys

被引：0
作者：
Li J. [1 ]
Xu F. [1 ]
You J. [1 ]
Ye S. [1 ]
Guo J. [1 ]
Lan Z. [1 ]
机构：
[1] Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, College of Physics Science and Technology, Guangxi University, Nanning
来源：
Cailiao Daobao/Materials Review | 2016年 / 30卷 / 07期
关键词：
Cyclic stability; Electrochemical property; Hydrogen storage alloy; Hydrogen storage characteristic;
D O I：
10.11896/j.issn.1005-023X.2016.14.007
中图分类号：
学科分类号：
摘要：
La0.7Mg0.3-xLixNi2.8Co0.5(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 performance of La0.7Mg0.3-xLixNi2.8Co0.5(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. © 2016, Materials Review Magazine. All right reserved.
引用
收藏
页码：29 / 33
页数：4
相关论文
共 18 条
[1]  
Tian X., Yun G.H., Wang H.Y., Et al., Preparation and electrochemical properties of La-Mg-Ni-based La<sub>0.75</sub>Mg<sub>0.25</sub>Ni<sub>3.3</sub>Co<sub>0.5</sub> multiphase hydrogen storage alloy as negative material of Ni/MH battery, Int J Hydrogen Energy, 39, (2014)
[2]  
Peng W.Q., Et al., Effect of partial substitution of Co by Fe on the hydrogen storage performance of La<sub>0.7</sub>Zr<sub>0.1</sub>Mg<sub>0.2</sub>Ni<sub>2.75</sub>Co<sub>0.75-x</sub>Fe<sub>x</sub>(x=0, 0.05, 0.1, 0.15, 0.2) alloys, Mater Rev: Res, 28, 1, (2014)
[3]  
Liu J.J., Han S.M., Li Y., Et al., Effect of Al incorporation on the degradation in discharge capacity and electrochemical kinetics of La-Mg-Ni-based alloys with A<sub>2</sub>B<sub>7</sub>-type super-stacking structure, J Alloys Compd, 619, (2015)
[4]  
Fang X.F., Luo Y.C., Gao Z.J., Et al., Effects of annealing treatment on microstructure and electrochemical properties of La<sub>0.68</sub>Gd<sub>0.2</sub>-Mg<sub>0.12</sub>Ni<sub>3.3</sub>Co<sub>0.3</sub>Al<sub>0.1</sub> hydrogen storage alloys, J Funct Mater, 43, 20, (2012)
[5]  
Dong Z., Ma L., Wu Y., Et al., Microstructure and electrochemical hydrogen storage characteristics of (La<sub>0.7</sub>Mg<sub>0.3</sub>)<sub>(1-x)</sub>Ce<sub>x</sub>Ni<sub>2.8</sub>Co<sub>0.5</sub>(x=0~0.20) electrode alloys, Int J Hydrogen Energy, 36, (2011)
[6]  
Li R., Hu Z.Z., Liu Y.F., Et al., Structure and electrochemical properties of La<sub>0.7</sub>Mg<sub>0.3</sub>Ni<sub>2.65</sub>Co<sub>0.75-x</sub>Mn<sub>0.1</sub>Si<sub>x</sub> hydrogen storage electrode alloys, J Mater Sci Eng, 31, 3, (2013)
[7]  
Dong X.P., Yang L.Y., Li X.T., Et al., Effect of substitution of aluminum for nickel on electrochemical properties of La<sub>0.75</sub>Mg<sub>0.25</sub>Ni<sub>3.5-x</sub>-Co<sub>0.2</sub>Al<sub>x</sub> hydrogen storage alloys, J Rare Earths, 29, (2011)
[8]  
Gao Z.J., Luo Y.C., Li R.F., Et al., Phase structures and electrochemical properties of La<sub>0.8-x</sub>Gd<sub>0.2</sub>Mg<sub>x</sub>Ni<sub>3.1</sub>Co<sub>0.3</sub>Al<sub>0.1</sub> hydrogen storage alloys, J Power Sources, 241, (2013)
[9]  
Zhang Y., Yang T., Shang H., Et al., Electrochemical hydrogen sto-rage kinetics of La<sub>0.75-x</sub>Zr<sub>x</sub>Mg<sub>0.25</sub>Ni<sub>3.2</sub>Co<sub>0.2</sub>Al<sub>0.1</sub>(x=0~0.2) alloys prepared by melt spinning, Energy Procedia, 16, (2012)
[10]  
Miao H., Liu Y.F., Lin Y., Et al., A study on the microstructures and electrochemical properties of La<sub>0.7</sub>Mg<sub>0.3</sub>Ni<sub>2.45-x</sub>Cr<sub>x</sub>Co<sub>0.75</sub>Mn<sub>0.1</sub>-Al<sub>0.2</sub>(x=0.00~0.20) hydrogen storage electrode alloys, Int J Hydrogen Energy, 33, (2008)
12