Interfacial charge-transfer enhances the dual-function of the porous NiCo2S4@SiO2 heterojunction for high-performance Li–S batteries

Porous NiCo2S4@SiO2 is employed as the sulfur host. The negatively charged SiO2 can increase the charge density and conductivity of NiCo2S4 and accelerate the conversion of sulfur. The charge transfer effect would in turn reduce the electrostatic repulsion between SiO2 and negatively charged polysulfide, thereby enhancing the adsorption of polysulfides.