【摘要】 选择沥青、柠檬酸和蔗糖为碳源,通过机械球磨、喷雾干燥、高温热解工艺制备了不同的SiO/C复合材料。利用XRD、TG、SEM来研究用不同碳源制备的SiO/C复合材料的微观结构与形貌,结果表明,以沥青为碳源制备的SiO/C复合材料含有最高的碳含量。电化学测试结果表明,以沥青、柠檬酸和蔗糖为碳源制备的SiO/C复合材料首次库仑效率分别为62.7%、54.6%和53.6%,100次循环后比容量分别为661.7、565.1和322.8 mAh/g。由此说明,以沥青为碳源制备的SiO/C复合材料具备最好的电化学性能,原因主要是由于其含有最高的无定形碳含量。更多还原

【Abstract】 The SiO/C composites were prepared by mechanical ball-milling, spray drying and high-temperature pyrolysis technology, using asphalte, citric acid and sucrose as carbon sources. The microstructure and morphology of the prepared SiO/C composites by different carbon sources were characterized by XRD, TG and SEM. The test results demonstrate that the carbon content of SiO/C composite using asphalt, citric acid, sucroce are 15.8%, 14.1%,9.7%, respectively. The electrochemical tests result show that the coulombic efficiency of SiO/C composites using asphalte, citric acid and sucrose as carbon sources are 62.7%, 54.6% and 53.6%, respectively. After 100 discharge/charge cycles,the discharge specific capacity are 661.7, 565.1 and 322.8 mAh/g, respectively. This implies the SiO/C composite by asphalt exhibits the best electrochemical performances, and the enhanced electrochemical performances are attributed to the most amorphous carbon content.更多还原