Bi-phase intergrowth heterogeneous construction fashioned by NFP and NFPP-4.0 within the new composite materials NFPP-4.5 and the activation of NFP. Credit score: Xu Chunliu Because of the low value of uncooked supplies and lengthy lifespan rendered by their secure construction, iron-based phosphate cathodes are thought to be some of the promising cathodes for Na-ion batteries