Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 16: Functional Semiconductors for Renewable Energy Solutions I

HL 16.2: Talk

Tuesday, March 19, 2024, 09:45–10:00, ER 325

Rational Design of the CoS Co9S8@NC Composite Enabling High-Rate Sodium-Ion Storage — •Ying Qi — TU Ilmenau

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.

Keywords: cobalt sulfide heterostructure; Na-ion diffusion; nitrogen-doped carbon