The rod-like and bundle-like v-LiV205 were synthesized via a simple solvothermal process- ing. The rod-like 7-LiV205 with diameter of 500-800 nm and the bundle-like architectures are composed of several of order-attac...The rod-like and bundle-like v-LiV205 were synthesized via a simple solvothermal process- ing. The rod-like 7-LiV205 with diameter of 500-800 nm and the bundle-like architectures are composed of several of order-attached rods with diameter of 100-600 nm. ＂y-LiV205 were synthesized using LiOH.H20, NH4VO3, HNO3, C2H5OH without and with PVP as raw materials. At the same time, the actual formation mechanism of Y-LiV205 was also investigated. As the cathode materials for lithium ion batteries, the bundle-like Y-LiV205 prepared with PVP delivers a better electrochemical performance, which has an initial dis charge capacity of 269.3 mAh/g at a current density of 30 mA/g and is still able to achieve 228 mAh/g after the 20th cycle. The good electrochemical properties of the as-synthesized Y-LiV205 coupled with the simple, relatively low temperature, and low cost of the prepara tion method may make this material a promising candidate as a cathode material for lithium ion batteries.展开更多
Cs0.35V2O5 was successfully synthesized as cathode material for lithium secondary battery by the rheological phase reaction method from Cs2CO3 and NH4VO3. The Cs0.35V2O5/Cu composite material was prepared by the displ...Cs0.35V2O5 was successfully synthesized as cathode material for lithium secondary battery by the rheological phase reaction method from Cs2CO3 and NH4VO3. The Cs0.35V2O5/Cu composite material was prepared by the displacement reaction in CuSO4 solution using zinc powder as a reductant. The structure and electrochemical property of the so-prepared powders were characterized by means of XRD （powder X-ray diffraction） and the galvanostatic discharge-charge techniques. The results show that the electrochemical property of Cs0.35V2O5/Cu composite material is significantly improved compared to the bulk Cs0.35V2O5 material. The Cs0.35V2O5/Cu composite material exhibits the first discharge capacity as high as 164.3 mAh.g -1 in the range of 4.2-1.8V at a current rate of 10 mA.g-1 and remains at a stable discharge capacity of about 110 mAh.g-1 within 40 cycles.展开更多
V2O5/NaV6O15 nanocomposites were synthesized by a facile hydrothermal method using VO2(B)nanoarrays as the precursor.X-ray diffraction,scanning electron microscopy and transmission electron microscopy,and galvanostati...V2O5/NaV6O15 nanocomposites were synthesized by a facile hydrothermal method using VO2(B)nanoarrays as the precursor.X-ray diffraction,scanning electron microscopy and transmission electron microscopy,and galvanostatic charge-discharge test were used to evaluate the structures,morphologies and electrochemical performance of samples,respectively.The results show that the nanocomposites are composed of one-dimensional nanobelts,preserving the morphology of the precursor well,and the hydrothermal reaction time has a significant effect on the phase contents and electrochemical performance of the composites.Compared with pure V2O5,V2O5/NaV6O15 nanocomposites exhibit enhanced electrochemical performance as cathode for sodium-ion batteries.It should be ascribed to the synergistic effect between V2O5 with high capacity and NaV6O15 with good cycling performance,and the introduced massive interfacial areas which can provide additional ion storage sites and improve the electronic and ionic conductivities.展开更多
文摘The rod-like and bundle-like v-LiV205 were synthesized via a simple solvothermal process- ing. The rod-like 7-LiV205 with diameter of 500-800 nm and the bundle-like architectures are composed of several of order-attached rods with diameter of 100-600 nm. ＂y-LiV205 were synthesized using LiOH.H20, NH4VO3, HNO3, C2H5OH without and with PVP as raw materials. At the same time, the actual formation mechanism of Y-LiV205 was also investigated. As the cathode materials for lithium ion batteries, the bundle-like Y-LiV205 prepared with PVP delivers a better electrochemical performance, which has an initial dis charge capacity of 269.3 mAh/g at a current density of 30 mA/g and is still able to achieve 228 mAh/g after the 20th cycle. The good electrochemical properties of the as-synthesized Y-LiV205 coupled with the simple, relatively low temperature, and low cost of the prepara tion method may make this material a promising candidate as a cathode material for lithium ion batteries.
文摘Cs0.35V2O5 was successfully synthesized as cathode material for lithium secondary battery by the rheological phase reaction method from Cs2CO3 and NH4VO3. The Cs0.35V2O5/Cu composite material was prepared by the displacement reaction in CuSO4 solution using zinc powder as a reductant. The structure and electrochemical property of the so-prepared powders were characterized by means of XRD （powder X-ray diffraction） and the galvanostatic discharge-charge techniques. The results show that the electrochemical property of Cs0.35V2O5/Cu composite material is significantly improved compared to the bulk Cs0.35V2O5 material. The Cs0.35V2O5/Cu composite material exhibits the first discharge capacity as high as 164.3 mAh.g -1 in the range of 4.2-1.8V at a current rate of 10 mA.g-1 and remains at a stable discharge capacity of about 110 mAh.g-1 within 40 cycles.
基金Project(2020JJ5102)supported by the Natural Science Foundation of Hunan Province,ChinaProject(19A111)supported by the Scientific Research Fund of Hunan Provincial Education Department,China。
文摘V2O5/NaV6O15 nanocomposites were synthesized by a facile hydrothermal method using VO2(B)nanoarrays as the precursor.X-ray diffraction,scanning electron microscopy and transmission electron microscopy,and galvanostatic charge-discharge test were used to evaluate the structures,morphologies and electrochemical performance of samples,respectively.The results show that the nanocomposites are composed of one-dimensional nanobelts,preserving the morphology of the precursor well,and the hydrothermal reaction time has a significant effect on the phase contents and electrochemical performance of the composites.Compared with pure V2O5,V2O5/NaV6O15 nanocomposites exhibit enhanced electrochemical performance as cathode for sodium-ion batteries.It should be ascribed to the synergistic effect between V2O5 with high capacity and NaV6O15 with good cycling performance,and the introduced massive interfacial areas which can provide additional ion storage sites and improve the electronic and ionic conductivities.
