American Chemical Society
ae1c00271_si_001.pdf (1.33 MB)

Rational Design of the CoS/Co9S8@NC Composite Enabling High-Rate Sodium-Ion Storage

Download (1.33 MB)
journal contribution
posted on 2021-05-27, 01:22 authored by Ying Qi, Tao Zhang, Ningxiang Wu, Huarui Ding, Gongxun Yu, Jiabiao Lian, Li Xu, Jingxia Qiu, Sheng Li
Metal sulfides have been considered promising anode materials for sodium-ion batteries (SIBs) due to their high specific capacities. However, the poor electrical conductivity and sluggish electrochemical kinetics of metal sulfides are the critical factors that are limiting their applications. In this work, cobalt sulfides with heterostructures embedded in an N-doped carbon composite (CoS/Co9S8@NC) have been synthesized to further investigate Na+ diffusion in the SIBs. With contributions from the heterostructure, the N-doped carbon, and the unique morphology, the composite can deliver enhanced rate capability and cycling stability compared to Co9S8. This work depicts the change of Na+ diffusion under the influence of heterostructures, providing an effective strategy of material design for enhancing the electrochemical performance of sodium-ion storage.