In situ tailoring bimetallic–organic framework-derived yolk–shell NiS2/CuS hollow microspheres: an extraordinary kinetically pseudocapacitive nanoreactor for an effective sodium-ion storage anode

Yolk–shell NiS₂/CuS hollow microspheres as an extraordinary kinetically pseudocapacitive nanoreactor for sodium-ion batteries manifest superb Na⁺-storage capability, including an ultrahigh ICE of 94.0%, remarkable specific capacity of 410.9 mA h g⁻¹ after 750 cycles at 2.0 A g⁻¹, excellent rate capability, and prolonged cyclability in terms of a remarkable retention of 283.4 mA h g⁻¹ even after 4200 cycles at 20.0 A g⁻¹.