State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology, Wuhan, 430070, PR China.
Nanoscale. 2013 Jun 7;5(11):4864-9. doi: 10.1039/c3nr01490h. Epub 2013 Apr 25.
Lithium-ion batteries (LIBs) are receiving considerable attention as storage devices in the renewable and sustainable energy developments. However, facile fabrication of long-life and high-rate cathode materials for LIBs is required to facilitate practical application. Here we report a favourable way to synthesize a Li3V2(PO4)3/C nanosphere cathode with three-dimensional (3D) continuous electron pathways by synergistically utilizing polyethyleneglycol (PEG) and acetylene black for carbon coating and conductive network construction. The as-prepared cathode material has a discharge capacity of 142 mA h g(-1) at 1 C rate, approaching its theoretical value (150 mA h g(-1)), and can even be cycled at a rate as high as 30 C without capacity fading. After 1000 cycles at a rate of 5 C, the as-prepared material has a capacity retention of up to 83%, and can also tolerate 5000 cycles with a considerable capacity, demonstrating excellent cycling stability. Our work shows that this material has great potential for high-energy and high-power energy storage applications, and this rational method can be applied to synthesize high-performance cathode materials on a large scale.
锂离子电池（LIBs）作为可再生和可持续能源发展中的储能设备受到了广泛关注。然而，为了促进实际应用，需要方便地制造长寿命和高倍率的 LIBs 阴极材料。在这里，我们报告了一种通过协同利用聚乙二醇（PEG）和乙炔黑来合成具有三维（3D）连续电子途径的 Li3V2(PO4)3/C 纳米球阴极的有利方法，用于碳涂层和导电网络构建。所制备的阴极材料在 1 C 倍率下具有 142 mA h g(-1)的放电容量，接近其理论值（150 mA h g(-1)），甚至可以在 30 C 的高倍率下循环而没有容量衰减。在 5 C 的倍率下循环 1000 次后，该材料的容量保持率高达 83%，并且还可以耐受 5000 次循环，具有相当的容量，表现出优异的循环稳定性。我们的工作表明，这种材料在高能和高功率储能应用方面具有巨大的潜力，这种合理的方法可以应用于大规模合成高性能阴极材料。
