Abstract: Ni/Al⁃LDHs/rGO composites with various GO contents (0, 0.2%, 0.5%, 0.8% and 1.0%) were prepared by a facile homogeneous precipitation method with Ni(NO3)2·6H2O, Al(NO3)3·9H2O, urea, and GO as raw materials. The microstructure and surface morphology of the prepared samples were characterized by XRD, FT⁃IR, TGA, and FESEM; the electrochemical properties of the samples as anode materials for Ni⁃MH battery were studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and charge⁃discharge tests. The results demonstrated that the electrochemical performance of Ni/Al⁃LDHs can be significantly improved by incorporating rGO. Among the five samples, the Ni/Al⁃LDHs/rGO composite with GO content of 0.8% exhibited the most excellent comprehensive electrochemical performance.For example, at the high current density of 2 000 mA/g, it still delivered a specific discharge capacity of 288 mA·h/g, which is 40.5% higher than that (205 mA·h/g) of the pure Ni/Al⁃LDHs sample.

Key words: Ni/Al?layered double hydroxides, Nickel?metal hydride battery, Cathode materials, Graphene oxide, Composite material

摘要： 以Ni(NO3)2·6H2O、Al(NO3)3·9H2O、尿素以及氧化石墨烯（GO）为原料，利用简便的均相沉淀法合成了GO复合量（质量分数）分别为0、0.2%、0.5%、0.8%和1.0%的Ni/Al⁃LDHs/rGO复合电极材料。采用XRD、FT⁃IR、TGA和FESEM表征了材料的结构和表面形貌，利用循环伏安（CV）、交流阻抗（EIS）和充放电测试研究了Ni/Al⁃LDHs/rGO复合材料作为Ni⁃MH电池正极材料的电化学性能。结果表明，复合GO可以明显提高Ni/Al⁃LDHs的电化学性能，其中GO复合量为0.8%的Ni/Al⁃LDHs/rGO样品表现出最为优异的综合电化学性能，例如在2 000 mA/g电流密度下，其放电比容量（288 mA·h/g）比未复合GO的Ni/Al⁃LDH样品放电比容量（205 mA·h/g）高出40.5%。

关键词: Ni/Al双氢氧化物, 镍氢电池, 正极材料, 氧化石墨烯, 复合材料