SnS/Fe7S8 heterojunction embedded in three-dimensional N, S co-doped carbon nanosheets as anode material for sodium-ion batteries with long-term cycle life

Authors：Cui, Lisan; Tan, Chunlei; Pan, Qichang^*; Huang, Youguo; Li, Yahao^*; Wang, Hongqiang; Zheng, Fenghua^*; Li, Qingyu

Source：Applied Surface Science, 2023, 613: 155992.

DOI：10.1016/j.apsusc.2022.155992

• Sodium ion batteries
• Anode
• Bimetallic sulfide
• Heterostructure

Bimetallic sulfide SnS/Fe7S8 nanoparticles were embedded in three-dimensional N, S co-doped carbon nano -sheets (SnS/Fe7S8/NS-CNs composite) have been synthesized via a simple method. Dense SnS/Fe7S8 nano -particles were prepared using the electropositive Fe(OH)33+ colloid to adsorb SnO32-ions. And the carbon matrix was obtained with polyvinylpyrrolidone as the carbon source. The SnS/Fe7S8/NS-CNs composite as the sodium -ion batteries (SIBs) anode shows excellent cycle and rate performance, it deliver a high first discharge/charge capacity of 873/559.2 mAh g-1 at 0.2 A g-1 and a high maintained capacity 305.2 mAh g-1 after long cycle (over 2000 cycles) at 1.0 A g-1. Benefiting from bimetallic sulfide heterostructure, which can boost the electron/Na+ transfer kinetics and the SnS/Fe7S8 particle breaking avoidance by the 3D carbon matrix with dense carbon nanosheets, caused SnS/Fe7S8/NS-CNs electrode get outstanding electrochemical properties. In addition, the electrochemical conductivity was improved by the N, S co-doped 3D carbon nanosheet matrix. Thus, the SnS/ Fe7S8/NS-CNs composite is a potential anode material for high performance SIBs.

• Institution
  广西大学