Engineering of Ni3S4/Co3S4 nanosheets@N, S co-doped carbon anode for lithium-ion batteries

Developing lithium-ion batteries (LIBs) with high electrochemical performance to meet the energy storage requirements has become a research hotspot. Transition metal sulfides (TMSs) have drawn much attention because of their long cycle life and significantly specific capacity. Herein, we synthesize the Ni3S4/Co3S4 nanosheets@N, S co-doped carbon (Ni3S4/Co3S4@NSC) composites by hydrothermal technology. Such nanosheets constituted by heterostructure and glass state of Ni3S4 and Co3S4 are beneficial to lithium-ion transport, and N, S co-doping improves electronic structure for the enhancement of electronic conductivity. Its synergetic effect delivers a high specific capacity of 1619.1 mA h g(-1) at a current density of 100 mA g(-1) with a stable coulombic efficiency of similar to 97%. Unique 120 degrees angle formed by assembling nanosheets on the surface of mesoporous carbon facilitates a good cycle stability (a capacity retention ratio of similar to 74.3% over 100 cycles). This work provides a new strategy to regulate performance of LIB anodes.

Automated summary

In this study, Ni3S4/Co3S4@NSC composites were synthesized using hydrothermal technology, which enhanced electronic conductivity and lithium-ion transport rate, resulting in high specific capacity and stable coulombic efficiency. The composite material exhibited excellent cycle stability, providing a new strategy for regulating the performance of LIB anodes.