| Summary: | The effects of yttrium substitution for magnesium in the La2Mg1−xYxNi8.8Co0.2 hydrogen storage alloys on the electrochemical properties are investigated in this paper. Yttrium substitution in the alloys can significantly improve the cycle stability, although the discharge capacity was decreased. The capacity and retention capacity after 20th cycle of the La2Mg0.9Y0.1Ni8.8Co0.2 alloys achieved values above 370 mAh/g and 95%, respectively, which already exceed those of most hydrogen storage alloys with A2B7 or AB3 structure. The charge-transfer resistance also reached the lowest when x was 0.1 in the La2Mg1−xYxNi8.8Co0.2 alloy, resulting in the highest charge transfer rate. Keywords: Energy storage and conversion, Elemental substitution, Metals and alloys, Ni/MH battery
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