Research Progress on Nickel‐Based Materials in Supercapacitors: A Review of Electrode Materials and Device Properties

Driven by the global energy transition and carbon neutrality goals, it is imperative to develop high-performance supercapacitor energy storage devices by integrating the respective advantages of battery-type and capacitive-type materials. Nickel-based materials have garnered significant attention in the industry due to their excellent electrical conductivity, high reactivity, and high specific capacity. Researchers have continuously explored solutions to overcome challenges such as complex synthesis processes and poor thermal stability. To date, multiple optimization strategies have been implemented to develop a new generation of nickel-based electrode materials, achieving a series of breakthroughs. This review systematically summarizes the research progress and critical scientific challenges in nickel-based materials for supercapacitors, covering synthesis methods, energy storage mechanisms, and material optimization pathways. It proposes solutions to potential key issues in nickel-based materials, aiming to provide theoretical guidance and technical roadmap references for the development of next-generation high-performance nickel-based supercapacitor electrode materials.