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通过在载有四硫代钼酸铵的石墨烯泡沫(GF)基底上化学气相沉积(CVD)石墨烯,直接制备出具有包埋结构的MoS_2/GF复合材料.SEM和TEM的结构分析结果表明,粒径约50nm的MoS_2被紧密包埋在三维多孔石墨烯泡沫集流体上,可直接作为锂离子电池的储锂阳极.Raman光谱证实,CVD法制备的石墨烯具有高的品质,可以为MoS_2/GF复合材料提供良好的电子导电网络.充放电测试结果表明,MoS_2/GF复合阳极具有高的储锂容量、良好的循环性.其初始容量为1 016mAh/g;循环50周后,比容量仍保持在800mAh/g以上.复合阳极优异的储锂性能主要来自于两方面:一方面,GF基体的三维孔结构可有效增加电极的反应界面,保证了MoS_2的高电化学利用率;另一方面,GF的包埋有效缓解了MoS_2的体积效应,保证了活性物质的电化学稳定性.
The MoS 2 / GF composites with embedded structures were directly prepared by chemical vapor deposition (CVD) graphene on a graphene foam (GF) substrate containing ammonium tetrathiomolybdate.The results of structural analysis of SEM and TEM , MoS_2 with particle size of about 50nm is tightly embedded in the three-dimensional porous graphene foam current collector and can be directly used as lithium storage anode for lithium ion battery.Raman spectroscopy confirmed that the graphene prepared by CVD method has high quality and can be MoS_2 / GF composites. The results of charge and discharge tests showed that the MoS_2 / GF composite anode possesses high lithium storage capacity and good cycling performance with an initial capacity of 1 016 mAh / g. After 50 cycles, the specific capacity And remained above 800mAh / g.The excellent lithium storage performance of the composite anode mainly comes from two aspects: on the one hand, the three-dimensional pore structure of the GF matrix can effectively increase the reaction interface of the electrode to ensure the high electrochemical utilization rate of MoS_2; In terms of the embedding of GF, the volume effect of MoS 2 is effectively relieved, ensuring the electrochemical stability of the active material.