CAJ | 학술논문

氧化石墨烯与纳米SiO2的混合悬浮液经过冷冻干燥、热退火和HF处理制得了褶皱石墨烯。将褶皱石墨烯与Si纳米颗粒在乙醇中分散后缓慢干燥制备了纳米Si/褶皱石墨烯(SCG)复合材料。Si纳米颗粒均匀分散于褶皱石墨烯中，并被石墨烯网络包围。作为锂离子电池负极材料，SCG具有高的库仑效率，在500 mA/g的电流密度下，80个循环后的比容量为1003 mAh/g，表现出良好的循环稳定性。如此优越的电化学性能要归因于褶皱石墨烯的高电导率和良好的机械柔韧性。
양화석묵희여납미SiO2적혼합현부액경과냉동간조、열퇴화화HF처리제득료습추석묵희。장습추석묵희여Si납미과립재을순중분산후완만간조제비료납미Si/습추석묵희(SCG)복합재료。Si납미과립균균분산우습추석묵희중，병피석묵희망락포위。작위리리자전지부겁재료，SCG구유고적고륜효솔，재500 mA/g적전류밀도하，80개순배후적비용량위1003 mAh/g，표현출량호적순배은정성。여차우월적전화학성능요귀인우습추석묵희적고전도솔화량호적궤계유인성。
Crumpled graphene was prepared through freeze-drying, thermal annealing and HF treating the mixture suspension of graphene oxide and nano-SiO2. Nano-Si/crumpled graphene (SCG) composite material was prepared by dispersing nano-Si and crumpled graphene in ethanol solution and slowly drying the two materials. In SCG composite, Si nanoparticles were uniformly dispersed among crumpled graphene and surrounded by graphene networks. As the anode material for lithium ion batteries, the SCG exhibits high coulombic efficiency and good cycle stability of 1 003 mAh/g at the current density of 500 mA/g after 80 cycles. Such superior electrochemical perfor-mance should be attributed to high conductivity and good mechanical flexibility of crumpled graphene.