Supercritical Carbon Dioxide Anchored Fe 3 O 4 Nanoparticles on Graphene Foam and Lithium Battery Performance

作者：Xuebo Hu, Minhao Ma, Mengqi Zeng, Yangyong Sun, Linfeng Chen, Yinghui Xue, Tao Zhang, Xinping Ai, Rafael G. Mendes, Mark H. Rümmeli, Lei Fu · 发表于：ACS Applied Materials & Interfaces · 年份：2014 · DOI：10.1021/am5066255 · 被引用次数：92 · 研究领域：Advancements in Battery Materials、Supercapacitor Materials and Fabrication、Advanced Battery Materials and Technologies

Magnetite (Fe3O4) is an attractive electrode material due to its high theoretical capacity, eco-friendliness, and natural abundance. However, its commercial application in lithium-ion batteries is still hindered by its poor cycling stability and low rate capacity resulting from large volume expansion and low conductivity. We present a new approach which makes use of supercritical carbon dioxide to efficiently anchor Fe3O4 nanoparticles (NPs) on graphene foam (GF), which was obtained by chemical vapor deposition in a single step. Without the use of any surfactants, we obtain moderately spaced Fe3O4 NPs arrays on the surface of GF. The particle size of the Fe3O4 NPs exhibits a narrow distribution (11 ± 4 nm in diameter). As a result, the composites deliver a high capacity of about 1200 mAh g(-1) up to 500 cycles at 1 C (924 mAh g(-1)) and about 300 mAh g(-1) at 20 C, which reaches a record high using Fe3O4 as anode material for lithium-ion batteries.