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Yifu Zhang,Chongxue Chen,Juecheng Zhang,Ling Hu,Weibing Wu,Yalan Zhong,Yuliang Cao,Xinghai Liu,Chi Huang 한국물리학회 2013 Current Applied Physics Vol.13 No.1
VO2(M) nanobelts encapsulated into carbon coreeshell structured composite (VO2(M)@C) was successfully synthesized by the thermal treatment with the precursor V3O7$H2O@C composite under the inert atmosphere. The as-obtained sample was characterized by XRD, EDS, EA, FT-IR, Raman, SEM and TEM measurements. The core exhibited monoclinic phase VO2(M) and the carbon coated on the surface of VO2(M) was amorphous. The average thickness of carbon was about 18.5 nm. The possible formation mechanism of VO2(M)@C was proposed as that the reaction underwent the solid state reaction by the interface reaction between V3O7 core and carbon shell. Furthermore, VO2(M) and VO2(M)@C composite were explored as the cathode materials to apply in lithium-ion batteries, indicating that the VO2(M)@C composite electrode exhibited the better electrochemical properties than that of pure VO2(M), achieving the aim of improving the electrochemical properties of VO2(M).
Yifu Zhang,Min Zhou,Meijuan Fan,Chi Huang,Chongxue Chen,Yuliang Cao,Houbin Li,Xinghai Liu 한국물리학회 2011 Current Applied Physics Vol.11 No.5
V_3O_7ㆍH_2O@C core-shell structured composites have been successfully synthesized using V_3O_7ㆍH_2O nanobelts as the cores and glucose as the source of carbon in the presence of sodium lauryl sulfate (SDS). The as-obtained V_3O_7ㆍH_2O@C core-shell materials were characterized by X-ray powder diffraction (XRD),transmission electron microscopy (TEM), elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR) and Raman spectrum. The thickness of the carbon shell can be controlled by the hydrothermal reaction time and the quantity of glucose. The surfactants have great influence on fabricating V_3O_7ㆍH_2O@C core-shell composites, which have been discussed in detail. V_3O_7@C composites were subsequently obtained through thermal treatment with V_3O_7ㆍH_2O@C. The electrochemical properties of V_3O_7@C core-shell composites were studied, indicating that the discharge capacity is still 151.2 mAh/g after 45 cycles, which is better than that of pure V_3O_7ㆍH_2O nanobelts.