Bimetallic metal-organic framework derived transition metal sulfide microspheres as high-performance lithium/sodium storage materials

Abstract

MoS2 as a promising electrode has aroused widely attention because of the high theoretical capacity. However, the poor electrical conductivity and large volume expansion seriously impede the practical application. Herein, we propose a novel hydrangea-like hierarchical Zn0.76Co0.24S@NC@MoS2 (denoted as ZCS@NC@MS) composite by cultivating ultrathick MoS2 nanoplates on N-doped carbon matrix derived from the bimetallic metal–organic framework. On the one hand, the N-doped carbon matrix can not only improve the electrical conductivity, but also mitigate the volume expansion. In addition, the heterointerfaces can induce the built-in electric field, thus facilitating the ion diffusion kinetics. Integrating the above advantages, ZCS@NC@MS as anode for lithium-ion batteries delivers an outstanding specific capacity of 1040.5 mAh g−1 at 0.1 A g−1 and a high reversible capacity of 680 mAh g−1 over 1000 cycles at 1.0 A g−1. ZCS@NC@MS as anode for sodium-ion batteries also manifests an excellent specific capacity of 723.6 mAh g−1 at 0.1 A g−1. The density functional theory calculation further confirms that heterointerfaces can effectively improve the reaction kinetic. Consequently, this novel strategy provides a new pathway to improve the energy storage performance of two-dimension transition metal sulfides.