Colloidal Antimony Sulfide Nanoparticles as a High-Performance Anode Material for Li-ion and Na-ion Batteries.

To maximize the anodic charge storage capacity of Li-ion and Na-ion batteries (LIBs and SIBs, respectively), the conversion-alloying-type SbS anode has attracted considerable interest because of its merits of a high theoretical capacity of 946 mAh g and a suitable anodic lithiation/delithiation voltage window of 0.1-2 V vs. Li/Li. Recent advances in nanostructuring of the SbS anode provide an effective way of mitigating the challenges of structure conversion and volume expansion upon lithiation/sodiation that severely hinder the SbS cycling stability. In this context, we report uniformly sized colloidal SbS nanoparticles (NPs) as a model SbS anode material for LIBs and SIBs to investigate the effect of the primary particle size on the electrochemical performance of the SbS anode. We found that compared with microcrystalline SbS, smaller ca. 20-25 nm and ca. 180-200 nm SbS NPs exhibit enhanced cycling stability as anode materials in both rechargeable LIBs and SIBs. Importantly, for the ca. 20-25 nm SbS NPs, a high initial Li-ion storage capacity of 742 mAh g was achieved at a current density of 2.4 A g. At least 55% of this capacity was retained after 1200 cycles, which is among the most stable performance SbS anodes for LIBs.