To prepare an anode material for Li-ion batteries with high discharge capacity and good cycling stability, disordered carbon （DC） formed by calcinations of 3,4,9,10-perylenetetracarboxylic dianhydride was modified v...To prepare an anode material for Li-ion batteries with high discharge capacity and good cycling stability, disordered carbon （DC） formed by calcinations of 3,4,9,10-perylenetetracarboxylic dianhydride was modified via an acid treatment using a mixture of HNO3 and H2SO4. The modified disordered carbon （MDC） was characterized by Fourier-transform infrared （FTIR） spectroscopy, X-ray diffraction （XRD） analysis, Brtmaner-Emmett-Teller （BET） analysis, and scanning electron microscopy （SEM）. FTIR spectra confirm the successful introduction of carbonyl groups onto the DC surface. Some pores appear in the columnar structure of MDC, as observed in SEM micro- graphs. Li＋ ions intercalation/deintercalation is facilitated by the modified morphology. Electrochemical tests show that the MDC exhibits a significant improvement in discharge capacity and cycling stability. These results indicate that the MDC has strong potential for use as an anode material in Li-ion batteries.展开更多
A stable and commercially available reagent mixture,composed of tetrabutylammonium bifluoride/potassium bifluoride（TBAF/KHF_2）,was found to be effective for the nucleophilic ring opening reactions of sugar-derived e...A stable and commercially available reagent mixture,composed of tetrabutylammonium bifluoride/potassium bifluoride（TBAF/KHF_2）,was found to be effective for the nucleophilic ring opening reactions of sugar-derived epoxides with fluoride.Different sugar-derived epoxide precursors,including 1-thioglycosides can be ring-opened to afford fluorinated carbohydrate products in high yields and in short reaction times.展开更多
基金financially supported by the National High-Tech Research and Development Program of China(No.2013AA050903)the Beijing Municipal Science and Technology Project(No.Z131100003413002)+1 种基金the Beijing Key Laboratory of Environmental Science and Engineering(No.20131039031)the Beijing Higher Institution Engineering Research Center for Power Battery and Chemical Energy Materials(No.2012039032)
文摘To prepare an anode material for Li-ion batteries with high discharge capacity and good cycling stability, disordered carbon （DC） formed by calcinations of 3,4,9,10-perylenetetracarboxylic dianhydride was modified via an acid treatment using a mixture of HNO3 and H2SO4. The modified disordered carbon （MDC） was characterized by Fourier-transform infrared （FTIR） spectroscopy, X-ray diffraction （XRD） analysis, Brtmaner-Emmett-Teller （BET） analysis, and scanning electron microscopy （SEM）. FTIR spectra confirm the successful introduction of carbonyl groups onto the DC surface. Some pores appear in the columnar structure of MDC, as observed in SEM micro- graphs. Li＋ ions intercalation/deintercalation is facilitated by the modified morphology. Electrochemical tests show that the MDC exhibits a significant improvement in discharge capacity and cycling stability. These results indicate that the MDC has strong potential for use as an anode material in Li-ion batteries.
基金the National Natural Science Foundation of China (No. 21502076) for the financial support
文摘A stable and commercially available reagent mixture,composed of tetrabutylammonium bifluoride/potassium bifluoride（TBAF/KHF_2）,was found to be effective for the nucleophilic ring opening reactions of sugar-derived epoxides with fluoride.Different sugar-derived epoxide precursors,including 1-thioglycosides can be ring-opened to afford fluorinated carbohydrate products in high yields and in short reaction times.
