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通过一种简单的液相法以及随后的热处理合成了石墨烯/氧化亚铜复合材料(Cu_2O/GNSs)。通过扫描电子显微镜、透射电子显微镜、X射线衍射以及X射线光电子能谱对复合材料的形貌和结构进行了表征。当复合材料作为锂离子电池负极材料时,在50 mA/g电流密度下,首次可逆容量为448 mAh/g,经过90次循环以后,容量增加到613 mAh/g。在500、1 000 mA/g下,可逆容量依然可达444、346 mAh/g,分别为50 mA/g电流密度下容量的99%和77%。Cu_2O/GNSs较高的容量以及优异的倍率性能应当归结于石墨烯与氧化亚铜之间的协同作用。
Graphene / cuprous oxide composites (Cu 2 O / GNSs) were synthesized by a simple liquid-phase method followed by heat treatment. The morphology and structure of the composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. When the composite was used as a negative electrode material for lithium-ion batteries, the first reversible capacity was 448 mAh / g at a current density of 50 mA / g, and the capacity increased to 613 mAh / g after 90 cycles. At 500,1000 mA / g, the reversible capacity is still 444,346 mAh / g, which is 99% and 77% of the capacity at 50 mA / g current density, respectively. The higher capacity of Cu 2 O / GNSs and excellent rate capability should be attributed to the synergy between graphene and cuprous oxide.