Aromatic carbon coated tin composites（A/Sn） have been prepared by thermal decomposition of the stannous 1,8-naphthalenedicarboxylate precursors,which is a reformative preparation method.Sugar carbon coated tin compo...Aromatic carbon coated tin composites（A/Sn） have been prepared by thermal decomposition of the stannous 1,8-naphthalenedicarboxylate precursors,which is a reformative preparation method.Sugar carbon coated tin composites（S/Sn） also are prepared as a contrast with the A/Sn composites.The morphology and composition of the products were characterized by Scanning Electricity Microscopy（SEM） and X-Ray Diffraction（XRD）.Their electrochemical performance as anode materials for lithium ion batteries were investigated;the results indicated that these materials exhibited good performance,and the cycle stability of A/Sn composites is especially superior to the S/Sn composites due to its special carbon resource.展开更多
The metal tin(Sn),as one potential anode material for lithium-ion batteries,rapidly degrades its cyclic performance due to huge volume expansion/contraction during lithium intercalation/de-intercalation process.Amorph...The metal tin(Sn),as one potential anode material for lithium-ion batteries,rapidly degrades its cyclic performance due to huge volume expansion/contraction during lithium intercalation/de-intercalation process.Amorphous carbon was adopted as conductive and buffer matrix to form Sn/C composites.The products were prepared by hydrothermal reaction and carbothermal reduction using tin tetrachloride and glucose as raw materials.The composites were characterized by X-ray diffraction(XRD),Raman spectroscopy,scanning electron microscopy(SEM),transmission electron microscopy(TEM),cyclic voltammetry(CV) and galvanostatic charge/discharge measurements.The results show that relative smaller metallic tin particles in 1:8 Sn/C composite are formed and distributed more uniformly in the carbon matrix.The lithium intercalation capacity of Sn/C composites reaches 820.4 mAh·g-1,and the capacity retention over 60 cycles remains 54.1%.1:8 Sn/C composite exhibits enhanced rate performance and cyclic stability compared to1:5 and 1:10 samples.展开更多
A new anode material for lithium ion batteries, MgSnO 3, was prepared through the pyrolysis of MgSn(OH) 6. The product was characterized by XRD, TEM and electrochemical measurements. The results show that it is amorph...A new anode material for lithium ion batteries, MgSnO 3, was prepared through the pyrolysis of MgSn(OH) 6. The product was characterized by XRD, TEM and electrochemical measurements. The results show that it is amorphous and the size is about 70—160 nm. The reversible capacity of the MgSnO 3 electrode was 635 mA·h·g -1 in the first cycle and was about 500 mA·h·g -1 in the 20th cycle.展开更多
基金Supported by the National Natural Science Foundation of China(20771087)
文摘Aromatic carbon coated tin composites（A/Sn） have been prepared by thermal decomposition of the stannous 1,8-naphthalenedicarboxylate precursors,which is a reformative preparation method.Sugar carbon coated tin composites（S/Sn） also are prepared as a contrast with the A/Sn composites.The morphology and composition of the products were characterized by Scanning Electricity Microscopy（SEM） and X-Ray Diffraction（XRD）.Their electrochemical performance as anode materials for lithium ion batteries were investigated;the results indicated that these materials exhibited good performance,and the cycle stability of A/Sn composites is especially superior to the S/Sn composites due to its special carbon resource.
基金financially supported by the Ningxia Natural Science Fund (No.NZ17096)the Ningxia Science Research Project for Colleges (No.NGY2016148)the Project from Ningxia Key Laboratory of Powder Materials and Special Ceramics (No.1603)
文摘The metal tin(Sn),as one potential anode material for lithium-ion batteries,rapidly degrades its cyclic performance due to huge volume expansion/contraction during lithium intercalation/de-intercalation process.Amorphous carbon was adopted as conductive and buffer matrix to form Sn/C composites.The products were prepared by hydrothermal reaction and carbothermal reduction using tin tetrachloride and glucose as raw materials.The composites were characterized by X-ray diffraction(XRD),Raman spectroscopy,scanning electron microscopy(SEM),transmission electron microscopy(TEM),cyclic voltammetry(CV) and galvanostatic charge/discharge measurements.The results show that relative smaller metallic tin particles in 1:8 Sn/C composite are formed and distributed more uniformly in the carbon matrix.The lithium intercalation capacity of Sn/C composites reaches 820.4 mAh·g-1,and the capacity retention over 60 cycles remains 54.1%.1:8 Sn/C composite exhibits enhanced rate performance and cyclic stability compared to1:5 and 1:10 samples.
文摘A new anode material for lithium ion batteries, MgSnO 3, was prepared through the pyrolysis of MgSn(OH) 6. The product was characterized by XRD, TEM and electrochemical measurements. The results show that it is amorphous and the size is about 70—160 nm. The reversible capacity of the MgSnO 3 electrode was 635 mA·h·g -1 in the first cycle and was about 500 mA·h·g -1 in the 20th cycle.
