用于锂离子电池的高性能SiO_x/C/石墨烯复合负极材料

A High-performance SiO_x/C/graphene Composite Anode for Lithium Ion Batteries

以SiO、丁苯橡胶(SBR)及石墨烯为原料,通过高温歧化、机械球磨、喷雾干燥和高温热解制备电化学性能优异的锂离子电池SiO_x/C/石墨烯复合负极材料。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线能谱仪(EDS)和恒流充放电测试仪对复合材料的物相、颗粒形貌及电化学性能等进行表征。结果表明,热解后的SiO_x/C/石墨烯复合负极材料的首次放电容量为1 807mAh/g,100次循环后,可逆容量高达1 349mAh/g,库伦效率为99.1%,循环稳定性远高于SiO_x/C和SiO_x/C/graphene前驱体,具有良好的倍率性能。

A SiOx/C/graphene composite anode for lithium ion batteries with excellent electrochemical performance was prepared from SiO,SBR and graphene via the disproportionation treatment of SiO at high temperature,mechanical milling,spray drying and pyrolysis.The phase composition,morphology and electrochemical performance of the composites were detected by X-ray diffractometer（XRD）,scanning electron microscope（SEM）,transmission electron microscope（TEM）,energy disperse spectroscopy（EDS）and constant current charge-discharge test.The electrochemical test results revealed that the initial discharge capacity of pyrolytic SiOx/C/graphene composite anode material was 1 807 mAh/g.The reversible capacity reached 1 349 mAh/g and the Coulombic efficiency was 99.1% after 100 cycles,indicating a much higher cyclic stability compared to the SiOx/C and SiOx/C/graphene precursors,along with a good rate performance.