This review focuses on the advancements in nickel-based composite materials for supercapacitor electrodes. Supercapacitors, known for their high capacitance and environmental friendliness, have gained significant attention due to the increasing demand for sustainable energy solutions. Nickel-based compounds are particularly favored for their high theoretical capacitance, affordability, ecological compatibility, and ease of synthesis. However, challenges such as inadequate rate capability and cycling properties limit their broader applications. The review discusses the characteristics, fabrication techniques, morphological attributes, and performance enhancement strategies of nickel-based composite materials. It also explores the electrochemical properties of supercapacitors, providing insights into the underlying causes of performance variations. Key topics include the synthesis methods (microwave-assisted deposition, electrophoretic deposition, chemical bath deposition, solvothermal, and hydrothermal methods), and the integration of additional materials (carbon materials, metal oxides/hydroxides, and metal sulfides) to enhance electrochemical performance. The review highlights recent studies that have achieved significant improvements in specific capacitance and rate capability through the optimization of nickel-based materials. For example, multilayer porous NiO nanosheet arrays and flower-like nano-spherical nickel-acylated electrode materials have demonstrated excellent cycle stability and high specific capacitance. Additionally, the integration of carbon materials and metal oxides/hydroxides has further enhanced the electrochemical performance of nickel-based composites. The review concludes by discussing the current challenges and potential solutions in the development of nickel-based supercapacitor electrodes, emphasizing the need for continued research and innovation to address these challenges. It also outlines future directions for the advancement of nickel-based composite materials in supercapacitor applications.This review focuses on the advancements in nickel-based composite materials for supercapacitor electrodes. Supercapacitors, known for their high capacitance and environmental friendliness, have gained significant attention due to the increasing demand for sustainable energy solutions. Nickel-based compounds are particularly favored for their high theoretical capacitance, affordability, ecological compatibility, and ease of synthesis. However, challenges such as inadequate rate capability and cycling properties limit their broader applications. The review discusses the characteristics, fabrication techniques, morphological attributes, and performance enhancement strategies of nickel-based composite materials. It also explores the electrochemical properties of supercapacitors, providing insights into the underlying causes of performance variations. Key topics include the synthesis methods (microwave-assisted deposition, electrophoretic deposition, chemical bath deposition, solvothermal, and hydrothermal methods), and the integration of additional materials (carbon materials, metal oxides/hydroxides, and metal sulfides) to enhance electrochemical performance. The review highlights recent studies that have achieved significant improvements in specific capacitance and rate capability through the optimization of nickel-based materials. For example, multilayer porous NiO nanosheet arrays and flower-like nano-spherical nickel-acylated electrode materials have demonstrated excellent cycle stability and high specific capacitance. Additionally, the integration of carbon materials and metal oxides/hydroxides has further enhanced the electrochemical performance of nickel-based composites. The review concludes by discussing the current challenges and potential solutions in the development of nickel-based supercapacitor electrodes, emphasizing the need for continued research and innovation to address these challenges. It also outlines future directions for the advancement of nickel-based composite materials in supercapacitor applications.