Abstract
Sn-based metal organic complexes with coor-dination bonds,multi-active sites,and high theoretical capacity have attracted much attention as promising anodes for lithium ion batteries.However,the low electrical con-ductivity and huge volume changes restricted their elec-trochemical stability and practical utilization.Herein,Sn-based anode with superior electrochemical performance,including a high reversible capacity of 1050.1 mAh·g-1 at 2 A·g-1 and a stable capacity of 1105.5 mAh·g-1 after 500 cycles at 1 A·g-1,was fabricated via a low-temperature calcination strategy from Sn metal organic complexes.The low-temperature calcination process regulates Sn-O bond and prevents the agglomeration of SnO2,generating highly dispersed SnO2 decorated metal organic complexes and providing sufficient active sites for ion storage.Ex situ characterizations expound that the undecomposed Sn-based metal organic complexes could be transformed into SnO2 during lithiation and delithiation,which enhances the electrical conductivity and induces a strong pseudo-ca-pacitive behavior,accelerating the electrochemical kinet-ics;the multiple solid electrolyte interface with inflexible LiF and flexible ROCO2Li buffers the volume variation of the electrode,resulting in its high electrochemical stability.This work provides a simple strategy for preparing excel-lent Sn-based anodes from metal organic complexes and reveals the lithium storage mechanism of the prepared Sn-based anode.
基金项目
Program for Science & Technology Innovation Talents in Universities of Henan Province(24HASTIT006)
Natural Science Foundations of China(42002040)
Natural Science Foundations of Henan Province(222300420502)
Key Science and Technology Program of Henan Province(222102240044)
Key Scientific Research Projects in Colleges and Universities of Henan Province(21B610010)
NETL
NSTL
万方数据