Abstract
AbstractIn order to improve the electrochemical properties of the La‐Fe−B system hydrogen storage alloy, graphene was synthesized and added into the hydrogen storage alloy La15Fe2Ni72Mn7B2Al2. The La15Fe2Ni72Mn7B2Al2 alloy was prepared by arc‐melting and the La15Fe2Ni72Mn7B2Al2+ x wt. % graphene (x=1, 3, 5) composites were obtained by mechanical ball‐milling method. The effects of graphene addition on their electrochemical properties and dynamic performances have been discussed. Structure analyses showed that the La15Fe2Ni72Mn7B2Al2 alloy was composed of LaNi5 phase, La3Ni13B2 phase and (Fe, Ni) phase. The electrochemical experimental results demonstrate that the discharge capacity of ball‐milled La15Fe2Ni72Mn7B2Al2 hydrogen storage alloys with graphene was significantly improved. With 3 wt. % graphene addition, the maximum discharge capacity can reach 288.4 mAh⋅g−1, which is much higher than that of norm alloy (215.3 mAh⋅g−1). Moreover, the high‐rate dischargeability (HRD) and self‐discharge characteristics were also increased with graphene addition.
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