Study on the Efficacy Loss of the La_0.75Mg_0.25Ni_3.47Co_0.2Al_0.03 Hydrogen Storage Alloy Electrode AITranslate

1Wei X D, Liu S S, Dong H, et al. Microstructures and electrochemical properties of Co-free ABs-type hydrogen storage alloys through substitution of Ni by Fe[J]. 2007,52(7) :2 423-2 428.

2Dong X P, Lu F X, Yang LY, et al. Influence of spark plasma sintering temperature on electrochemical per- formance of La0.80 Mg0.20 Ni3.75 alloy[J]. Materials Chemistry and Physics, 2008,112(2) : 596-602.

3Dong X P,Zhang YH, LF X,et al. Investigation on microstructures and electrochemical performances of La0.75 Mg0.25 Ni3.5 Cox (x = 0 - 0. 6 ) hydrogen storage alloys [J].Int J Hydrogen Energy, 2007, 32 (18): 4 949- 4 956.

4Liu Y F,Pan H G,Gao M X,etal. Function of A1 on the cycling behavior of the La-Mg-Ni-Co type alloy electrodes[J].Int J Hydrogen Energy, 2008, 33 ( 1 ): 124 - 133.

5Zhu H Y,Wu J,Wang Q D. Disproportionation of LaNi5 and TiFe in 4 MPa H2 at 300 ℃[J]. J Alloys Compd, 1992,185(1) :1-6.

6Inui H,Yamamoto T, Hirota M,et al. Lattice defects in- troduced during hydrogen absorption-desorption cycles and their effects on P-C characteristics in some intermetallic compounds[J]. J Alloys Compd,2002,330-332 :117 -124.

7Evgenij B, Macdonald J R. Impedance spectrocopy theory,experiment and application(2nd edition)[M]. New Jersey:John Wiley & Sons Incorporation,2005. 213.

8Goo N H,Jeomg W T,Lee K S. Effects of Zr addition on discharge properties of mechanically alloyed Mg2 Ni hy drogen-storage alloy electrode[J].J Power Sources, 2000,87 (1-2) : 118-124.

9Nordlien J H,Ono S, Masuko N,et al. Morphology and structure of oxide films formed on magnesium by expo- sure to air and water[J].J Electrochemical Society, 1995,142(10):3 320-3 322.

10Ao B Y,Chen S X,Jiang G Q. A study on wall stress induced by LaNi5 alloy hydrogen absorption-desorption cycles[J].J Alloys Compd,2005,390(1-2) ;122-126.

3罗永春,史亮,康龙,阎汝煦,孔令斌.La_(0.75)Mg_(0.25)Ni_(3.5-x)M_x(M=Si,Zn;x=0～0.5)储氢合金的相结构与电化学性能[J].兰州理工大学学报,2008,34(6):9-14. 被引量：2

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Chinese Library Classification Number:TG146.45[金属学及工艺—金属材料]

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La0.75Mg0.25Ni3.47Co0.2Al0.03 alloy was prepared by intermediate-frequency induction vacuum melting. The reasons for the efficacy loss of the alloy electrode were investigated by electrochemical and gaseous cycle experiments,SEM and XPS. The results show that capacity attenuation in both discharge and hydrogen absorption cycles takes place in rapid and slow stages. With cycling number increasing,the corrosive oxide on the surface of alloy particle increases during electrochemical cycling, and the contact resistance and charge transfer resistance first decrease and then increase. During gaseous hydrogen absorption and desorp- tion cycling,the crack of the alloy particle increases and the split extent enlarges. The main reason of the alloy electrode capacity decay is the oxidation and corrosion of La and Mg. Alloy particle pulverization ac- celerates the corrosion of La and Mg, and further deteriorates the cycling performance of the alloy electrode.