Advances on Nickel-Based Electrode Materials for Secondary Battery Systems: A Review

Captured by the high energy density and eco-friendly properties, secondary energy-storage systems have attracted a great deal of attention. For meeting with the demand of advanced systems with both cycling stability and high capacity, a series of tailoring methods have been used. Electrode materials, as the main components of a full cell, play importance roles in capacity contribution. Thus, exploring suitable materials has been deemed to be vital for the development of energy-storage systems. Recently, compared to the traditional carbon-based materials, the considerable electrochemical properties of metal-based samples have been observed. Alternatively, nickel-based materials displayed resource abundance, environmental-friendliness, and high theoretical specific capacity, while the rich exploring activities have been scarily summarized. In this review, the energy-storage performances of nickel-based materials, such as NiO, NiSe/NiSe2, NiS/NiS2/Ni3S2, Ni2P, Ni3N, and Ni(OH)2, are summarized in detail. For some materials with innovative structures, their merits and characteristics were discussed elaborately through four points: (1) the controlling of nanostructures, (2) the complexing of carbon materials, (3) the doping of heteroatoms, and (4) the designing of heterostructures. Significantly, the challenges and prospects of nickel-based materials for secondary battery systems are discussed. This work is expected to offer significant summarization and prospects about physical–chemical designing for nickel-based samples.