School of Physical Science and Technology, and Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University , Lanzhou 730000, China.
ACS Appl Mater Interfaces. 2014 Jan 8;6(1):648-54. doi: 10.1021/am404756h. Epub 2013 Dec 13.
Carbon-wrapped Fe3O4 nanoparticle films on nickel foam were simply prepared by a hydrothermal synthesis with sucrose as a precursor of subsequent carbonization. The as-prepared samples were directly used as binder-free anodes for lithium-ion batteries which exhibited enhanced rate performance and excellent cyclability. A reversible capacity of 543 mA h g(-1) was delivered at a current density as high as 10 C after more than 2000 cycles. The superior electrochemical performance can be attributed to the formation of a thin carbon layer which constructs a 3D network structure enwrapping the nanosized Fe3O4 particles. Such an architecture can facilitate the electron transfer and accommodate the volume change of the active materials during discharge/charge cycling.
碳包裹的四氧化三铁纳米粒子薄膜通过水热合成法在镍泡沫上生成，其中蔗糖作为后续碳化的前驱体。所制备的样品直接用作锂离子电池的无粘结剂阳极，表现出增强的倍率性能和优异的循环稳定性。在经过 2000 多次循环后，在高达 10C 的电流密度下，可提供 543 mA h g(-1)的可逆容量。优异的电化学性能可归因于形成了一层薄薄的碳层，构建了一个 3D 网络结构，包裹着纳米级的 Fe3O4 颗粒。这种结构可以促进电子转移并适应活性材料在充放电循环过程中的体积变化。
