Exploring hybrid hard carbon/Bi2S3-based negative electrodes for Na-ion batteries

• Post by: nfp
• 15/04/2024
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The study presents a hybrid hard-carbon/nanocrystalline-Bi₂S₃ (HC/Bi₂S₃) material applicable for negative electrodes in sodium-ion batteries. Electrochemical measurements, operando XRD, ex situ solid-state NMR, and high-resolution STEM imaging show the effectiveness of the HC/Bi₂S₃ hybrid configuration in the negative electrode and allows to elucidate the underlying charge storage mechanism. Electrochemical analysis demonstrates the improved performance of the hybrid materials over the pristine HC negative electrode and highlights the robustness and stability of the HC/Bi₂S₃ hybrids over prolonged cycling even under high current densities. Operando XRD experiments show the breakdown of the Bi₂S₃ nanocrystal structure in the initial cycle, further corroborated by ex situ solid-state NMR. High-resolution STEM imaging reveals morphological changes in Bi₂S₃ nanocrystals and highlights their resistance to pulverization due to their nanoscale dimensions. This work provides comprehensive insights into the electrochemical performance of the HC/Bi₂S₃ and sheds light on specific mechanisms and reactions occurring during cycling.

Full article here.

NFP Research Area: Nanomaterials for energy, environment and safety