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Study on Bi-MOF-derived Bi2S3-modified reduced graphene oxide for lithium–sulfur battery cathodes
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DOI：10.1016/j.diamond.2026.114018.png)
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Abstract
En 中文
Lithium–sulfur batteries are considered promising next-generation energy storage systems owing to their high theoretical energy density. However, their practical applications remain limited by the shuttle effect of polysulfides, the sluggish reaction kinetics of sulfur and Li2S, and the volume expansion of sulfur cathodes. To address these issues, a three-dimensional (3D) porous bismuth sulfide–reduced graphene oxide (Bi2S3@RGO) composite is synthesized as a cathode material using a Bi-based metal–organic framework as the precursor. The 3D porous RGO network forms a continuous conductive network for electron transport, and its flexible porous framework mitigates the volume changes of the sulfur cathode during cycling. The Bi2S3 nanorods anchored on the surface provide polar active sites, facilitating the efficient adsorption and accelerated conversion of lithium polysulfides. Electrochemical tests reveal that the Bi2S3@RGO-5 electrode maintains a reversible capacity of 516.1 mAh g−1 after 500 cycles at 0.5C, demonstrating a decay rate of merely 0.084% per cycle. At a high rate of 2C, the attenuation rate per cycle after 1000 cycles is only 0.059%, indicating that the material maintains stable electrochemical behavior and structural integrity during rapid charging and discharging. This study presents novel concepts for the design of cathode materials for lithium–sulfur batteries.
Keywords:
Lithium–sulfur battery cathode
Bi-based metal–organic framework
Reduced graphene oxide
Shuttle effect
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