本发明公开了一种用于超级电容器的钴镍氧化物/石墨片（Co1.29Ni1.71O4/GNF）复合材料及其制备方法和应用，具体步骤为：尿素、CoCl2·6H2O以及NiCl2·6H2O作为合成原料，通过一步水热法在石墨纳米片(GNF)的表面生长钴镍氧化物前驱体，然后经过煅烧形成Co1.29Ni1.71O4/GNF复合材料。本发明所述的制备方法选用GNF为原料，使得制备的Co1.29Ni1.71O4/GNF复合材料具有较大的比表面积，良好的导电性，以其作为电极材料，极大的提高了超级电容器的比容量、倍率性能和电化学稳定性。在超级电容器三电极体系测试中，本发明制备的材料在1A g‑1电流密度下表现出1135.6 F g‑1的高比容量，表现出良好的电化学性能，并且制备方法具有简单，成本低等优点。
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