Xin Feng-Xia, Tian Hua-Jun, Wang Xiao-Liang, Xu Wei, Zheng Wen-Ge, Han Wei-Qiang
ACS Appl Mater Interfaces. 2015 Apr 22;7(15):7912-9. doi: 10.1021/am508547g. Epub 2015 Apr 7.
The recently found intermetallic FeSn5 phase with defect structure Fe0.74Sn5 has shown promise as a high capacity anode for lithium-ion batteries (LIBs). The theoretical capacity is as high as 929 mAh g(-1) thanks to the high Sn/Fe ratio. However, despite being an alloy, the cycle life remains a great challenge. Here, by combining Fe0.74Sn5 nanospheres with reduced graphene oxide (RGO) nanosheets, the Fe0.74Sn5@RGO nanocomposite can achieve capacity retention 3 times that of the nanospheres alone, after 100 charge/discharge cycles. Moreover, the nanocomposite also displays its versatility as a high-capacity anode in sodium-ion batteries (SIBs). The enhanced cell performance in both battery systems indicates that the Fe0.74Sn5@RGO nanocomposite can be a potential anode candidate for the application of Li-ion and Na-ion battery.
最近发现的具有缺陷结构Fe0.74Sn5的金属间化合物FeSn5相已显示出有望成为锂离子电池（LIBs）的高容量负极材料。由于高Sn/Fe比，其理论容量高达929 mAh g(-1)。然而，尽管它是一种合金，但其循环寿命仍然是一个巨大的挑战。在此，通过将Fe0.74Sn5纳米球与还原氧化石墨烯（RGO）纳米片相结合，Fe0.74Sn5@RGO纳米复合材料在100次充/放电循环后，其容量保持率可达到单独纳米球的3倍。此外，该纳米复合材料在钠离子电池（SIBs）中作为高容量负极材料也展现出其通用性。在两种电池体系中增强的电池性能表明，Fe0.74Sn5@RGO纳米复合材料可能是锂离子和钠离子电池应用的潜在负极候选材料。
