A general approach to construct alien metal atoms (Al, Cr, Mn, Fe, Co, Ni, Cu, Zn) doped in tin‐phthalic acid complex for superior lithium storage

Abstract Tin‐based metal organic complexes with breakable coordination bonds, multiple active sites, and high theoretical capacity have attracted wide attentiorials for lithium‐ion batteries (LIBs). However, the inferior electrical conductivity and significant volume changes have limited their electrochemical stability and practical application performance. This work proposes a universal doping strategy for the preparation of tin‐phthalic acid complexes (Sn‐MOF) doped with metal atoms (Al, Cr, Mn, Fe, Co, Ni, Cu, Zn). Metal atoms are uniformly dispersed within Sn‐MOF for enhancing electrical conductivity and accommodating appropriate volume expansion, resulting in improved rate capability and cycling stability. Additionally, compared to a series of doped Sn‐MOF, Zn‐doped Sn‐MOF exhibits the most exceptional electrochemical performance with a high reversible capacity of 1131 mAh·g −1 and stable cycling performance at a current density of 0.5 A·g −1 , delivering a capacity of 1065 mAh·g −1 after 500 cycles. Zn‐doping catalyzes the lithiation reaction between Sn‐MOF and Li + , promoting their reaction kinetics during the first cycle. Furthermore, the Zn‐doped Sn‐MOF is inclined to form a thin and stable solid electrolyte interface film to maintain cyclic stability.