Fe-doped Ni3S2 nanocrystals in porous carbon composites: Root-whisker-like structures for boosted lithium storage kinetics

Transition metal sulfides have shown promise for high lithium storage capacities, but their conductivity and volume effects have limited their potential as anodes for lithium-ion batteries (LIBs). This study focused on structural design and developed Fe-doped Ni 3 S 2 nanocrystals embedded in porous carbon composites with a unique root-whisker-like structure. The porous and root-whisker morphology accelerated ion diffusion rates and reduced charge-transfer resistance, improving electrochemical reaction kinetics. The material exhibits a high capacitance-controlled capacity contribution of up to 90.19 %. Additionally, Distribution of Relaxation Times analysis confirms a faster electrochemical response. The strategy proposed in this work provides valuable guidance for designing carbon-based composite anodes for LIBs.