Red@Black phosphorus core–shell heterostructure with superior air stability for high-rate and durable sodium-ion battery

A new red@black phosphorus core–shell heterostructure anchored on three-dimensional N-doped graphene has been developed. By reducing the diffusion barriers of Na+ as well as the electron cloud density at the surfaces of RP@BP, a high-performance SIBs with enhanced air stability can be realized.