Sn has been considered one of the most promising metallic anode materials for lithium-ion batteries(LIBs)because of its high specific capacity.Herein,we report a novel amorphous tin-titanium-ethylene glycol(Sn-Ti-EG)b...Sn has been considered one of the most promising metallic anode materials for lithium-ion batteries(LIBs)because of its high specific capacity.Herein,we report a novel amorphous tin-titanium-ethylene glycol(Sn-Ti-EG)bimetal organic compound as an anode for LIBs.The Sn-Ti-EG electrode exhibits exceptional cyclic stability with high Li-ion storage capacity.Even after 700 cycles at a current density of 1.0 A g−1,the anode maintains a capacity of 345 mAh g−1.The unique bimetal organic structure of the Sn-Ti-EG anode and the strong coordination interaction between Sn/Ti and O within the framework effectively suppress the aggrega-tion of Sn atoms,eliminating the usual pulverization of bulk Sn through volume expansion.Furthermore,the Sn M-edge of the X-ray absorption near-edge structure spectra obtained using soft X-ray absorption spec-troscopy signifies the conversion of Sn2+ions into Sn0 during the initial lithiation process,which is reversible upon delithiation.These findings reveal that Sn is one of the most active components that account for the excellent electrochemical performance of the Sn-Ti-EG electrode,whereas Ti has no practical contribution to the capacity of the electrode.The reversible formation of organic functional groups on the solid electrolyte interphase is also partly responsible for its cyclic stability.展开更多
基金the National Natural Science Foundation of China(52277219,61974072,52032005)the Project of State Key Laboratory of Organic Electronics and Information Displays,Nanjing University of Posts and Telecommunications(GZR2022010024)+1 种基金Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX22_0992)JKK is grateful for the financial support(FSU 2023-022,PD#8295)from Khalifa University.
文摘Sn has been considered one of the most promising metallic anode materials for lithium-ion batteries(LIBs)because of its high specific capacity.Herein,we report a novel amorphous tin-titanium-ethylene glycol(Sn-Ti-EG)bimetal organic compound as an anode for LIBs.The Sn-Ti-EG electrode exhibits exceptional cyclic stability with high Li-ion storage capacity.Even after 700 cycles at a current density of 1.0 A g−1,the anode maintains a capacity of 345 mAh g−1.The unique bimetal organic structure of the Sn-Ti-EG anode and the strong coordination interaction between Sn/Ti and O within the framework effectively suppress the aggrega-tion of Sn atoms,eliminating the usual pulverization of bulk Sn through volume expansion.Furthermore,the Sn M-edge of the X-ray absorption near-edge structure spectra obtained using soft X-ray absorption spec-troscopy signifies the conversion of Sn2+ions into Sn0 during the initial lithiation process,which is reversible upon delithiation.These findings reveal that Sn is one of the most active components that account for the excellent electrochemical performance of the Sn-Ti-EG electrode,whereas Ti has no practical contribution to the capacity of the electrode.The reversible formation of organic functional groups on the solid electrolyte interphase is also partly responsible for its cyclic stability.
