LAUSR

ABSTRACT Antimony has emerged as a promising candidate for electrode materials attributed to tempting specific capacity and low cost. Nevertheless, the notorious volume fluctuation and unstable solid-electrolyte interphase (SEI) film give rise to structural degradation and rapid capacity decay. Herein, a remarkable dual-modification approach is investigated on Sb-based anode by Fe doping and double carbon coatings via self-assembling of novel Fe/Sb–hexamine bimetal–organic frameworks strategy followed by thermal treatment and chemical vapor deposition simultaneously. In the as-prepared composite, Fe-doped Sb nanoparticles decorated with in-situ formed amorphous carbon coating are dispersed in interconnected carbon matrices with robust contact (Fe-Sb@NSC). Fe-doping would effectively enhance the electric conductivity, regulate the dispersion of Sb particles, and act as buffer layer to hinder the aggregation of Sb during repeated discharge/charge process. Meanwhile, double carbon layers not only reduce electrolytic corrosion and enhance electric conductivity, but also provide robust shelter layer to restrict the volume variation and coarsening of Sb-based materials. Therefore, the dual-modified sample shows enhanced lithium storage performance with high reversible capacity, outstanding long-term stability and stable structure. Moreover, the kinetics analysis of Li+ storage indicates that the increased pseudocapacitive contribution and decreased charge transfer barriers after cycling may account for the promoted performance.