为了提高La0.94Mg0.06Ni3.49Co0.73Mn0.12Al0.20储氢合金的电化学性能,利用石墨烯与储氢合金研磨混合来对其进行表面改性处理.采用X射线粉末衍射仪(XRD)和扫描电子显微镜(SEM)分析合金的相结构和表面形貌.结果表明:添加石墨烯后合金的相结构并没有发生改变,石墨烯包覆在了合金的表面,增大了合金的比表面积,提高了合金的电化学性能.当添加质量分数为5％的石墨烯时,电极的最大放电容量可达到380.6 mAh/g,容量保持率S50从69.5％提高到71.1％.添加石墨烯后,交换电流密度、极限电流密度和腐蚀电位均变大、电化学反应阻抗降低,说明电极的动力学性能得到改善.
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