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NC@Bi 2 S 3 Nanospheres as High-Performance Anode Materials for Lithium-Ion Batteries

Year: 2024

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Bi 2 S 3 holds immense potential to be promoted as an anode material for lithium-ion batteries (LIBs), owing to the high theoretical gravimetric and volumetric capacities. However, the poor electrical conductivity and volume expansion during cycling hinder the practical applications of Bi 2 S 3 . Therefore, through subsequent heat treatment, the nitrogen-doped carbon film was successfully loaded on the nanosphere Bi 2 S 3, which we call nitrogen-rich carbon layer-coated Bi 2 S 3 (NC@Bi 2 S 3 ). Hence, the nanosphere Bi 2 S 3 uniformly covered by a nitrogen-rich carbon layer was successfully coated on the Bi 2 S 3 surface (NC@Bi 2 S 3 ) through post-treatment. Due to the effective interaction between glutathione and inorganic materials, dopamine hydrochloride molecules are introduced and polymerized on the surface of the spherical Bi 2 S 3 structure and then converted into a nitrogen-rich carbon layer with an average thickness of 10.0 nm. The electrochemical tests reveal that the discharge specific capacities of Bi 2 S 3 and NC@Bi 2 S 3 reach 340.99 and 645.13 mAh/g after 300 cycles at 100 mA/g, respectively. Kinetic analysis shows that the contribution of pseudocapacitance behavior increases by about 10% after the nitrogen-rich carbon layer is coated. These results suggest the potential of NC@Bi 2 S 3 as a high-performance anode material for LIBs; the stability can be enhanced by core–shell structures.

Source: ACS Omega

DOI: 10.1021/acsomega.4c08339