Engineering monodispersed 2 nm SbS particles embedded in a porphyrin-based MOF-derived mesoporous carbon network an adsorption method to construct a high-performance sodium-ion battery anode.

Sodium ion batteries (SIBs) are expected to replace lithium ion batteries (LIBs) as the next generation of large-scale energy storage applications because of their superior cost performance. However, the larger ionic radius of Na causes a remarkable volume expansion than that of Li during charge and discharge, which reduces the performance of the battery. In this work, we engineered a composite material in that monodispersed 2 nm SbS particles are uniformly loaded into a carbon matrix (SbS/CZM), which is obtained by carbonization of a zirconium-based MOF with adsorption of Sb. The obtained composite material has a high specific surface area in favor of mass transfer, and the porous structure can resist many volume changes in the circulation process. Moreover, the ultrafine SbS particles are well-distributed in the composite material, which increases the utilization of the active substance and is promising for the storage of Na. Based on its unique structure, the SbS/CZM composite shows a specific capacity of 550 mA h g at 100 mA g and an excellent cycling stability of 88.9% retention after 1000 cycles at 3 A g. The excellent electrochemical performance provides enlightenment for the rational design of hierarchical heterostructures for energy storage applications.