Novel Fe trihalides solid molten salt-FeX3 (X = F, Cl, Br) via one-step method with low temperature as anodes of lithium-ion batteries

Cost-effective metal trihalides exhibiting high specific capacity hold significant promise as anodes in lithium-ion batteries (LIBs). Within this study, the spotlight falls on innovative anode materials, denoted as solid molten salts (SMS-FeX3, X = F, Cl, Br), which are synthesized through the utilization of transition metal trihalides. SMS-FeX3 anodes offer a range of advantages, including facile synthesis, environmental sustainability, and the electro-chemical benefits stemming from the superior conductivity and electrochemical performance of solid molten salts. Leveraging the synergistic interaction between Fe trihalides (FeF3, FeCl3, FeBr3) and N-Methyl-2-Pyrroli-done (NMP), these SMS materials exhibit exceptional electrochemical performance and remarkable cycle stability. Furthermore, a comprehensive comparison among the three Fe trihalides underscores their distinct characteristics: SMS-FeF3 showcases a consistent Coulombic Efficiency of approximately 100 % throughout 400 cycles. SMS-FeCl3 stands out with an initial specific capacity of 1258 mAh/g at 100 mA g-1, sustaining at 900 mAh/g after 400 cycles. Meanwhile, SMS-FeBr3, serving as a comparative material, exhibits commendable rate performance even at 2000 mA g-1. These captivating and pioneering SMS-FeX3 anode materials offer a fresh perspective on the anode fabrication of LIBs, bearing exceptional promise for practical applications.