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.