Alkaline secondary battery iron-based negative electrode additive, preparation method and iron-based negative plate applying additive as well as application of iron-based negative plate

The invention discloses an alkaline secondary battery iron-based negative electrode additive, a preparation method and an iron-based negative electrode plate applying the additive as well as application of the iron-based negative electrode plate and belongs to the technical field of alkaline secondary batteries. The key point of the technical scheme of the invention is as follows: the alkaline secondary battery iron-based negative electrode additive is an S@C composite material formed by compounding elemental sulfur and a carbon material and having one or more of mixed structures, namely a three-dimensional structure, a hierarchical pore structure and a coating structure. The invention also specifically discloses a preparation method of the iron-based negative electrode additive, an iron-based negative electrode plate applying the iron-based negative electrode additive and an alkaline secondary battery applying the iron-based negative electrode plate. By adopting the novel alkaline secondary battery iron-base