Self-generated rich phase boundaries of heterostructured Ni0.85Se/(1T-2H)-MoSe2@N-C hierarchical nanospheres for reversible high-rate sodium-ion storage

To address the sluggish reaction kinetics and low ionic conductivity as well as huge volume change of metal selenides, heterostructured Ni0.85Se/(1T-2H)-MoSe2@N-C hierarchical nanospheres are fabricated. Benefiting from its own rich phase boundaries induced by the co-existence of 2H and 1T MoSe2 in Ni0.85Se/(1T-2H)-MoSe2@N-C, it exhibits high reversible rate performance and superior cycling stability in SIBs.