Metal-Organic Framework derived Bi2S3 hybrid nanofibers for enhanced lithium-ion storage

As an anode material for lithium ion batteries (LIBs), Bi2S3 possesses high redox activity and theoretical capacity. However, severe volume variation (alloying/dealloying processes) and active sulfide loss (dissolution of polysulfides) during cycling always result in rapid capacity degradation. Thus, we fabricated MOF-derived Bi2S3 hybrid nanofibers coated by organic framework via facile polymerization and sulfidation processes. Such unique coating nanolayers derived from the cross-linked organic framework based on the Bi-MOF (CAU-17) can effectively tolerate the volume expansion and active sulfide loss, thus leading to excellent cycling stability (1059 mAh g(-1) at 0.1 A g(-1) after 100 cycles, 1108 mAh g(-1)at 1.0 A g(-1)after 500 cycles), and rate performance (478 mAh g(-1) at 10 A g(-1)). This study offers a hopeful anode for highly efficient Li-ion storage, and a simple and low-energy-consuming strategy to improve the electrochemical performance of active materials.

Automated summary

The MOF-derived Bi2S3 hybrid nanofibers coated by organic framework showed excellent cycling stability and rate performance, effectively combating volume expansion and active sulfide loss. This material provides hope for highly efficient Li-ion storage and offers a simple and low-energy-consuming strategy to enhance the electrochemical performance of active materials.