Facile complex-coprecipitation synthesis of mesoporous Fe3O4 nanocages and their high lithium storage capacity as anode material for lithium-ion batteries
Facile complex-coprecipitation synthesis of mesoporous Fe3O4 nanocages and their high lithium storage capacity as anode material for lithium-ion batteries
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DOI：
10.1016/j.electacta.2015.02.017
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发表时间：
2015-04
影响因子：
6.6
通讯作者：
T. Xia;Xinglong Xu;Jingping Wang;Chunbo Xu;Fuchang Meng;Zhan Shi;Jie Lian;J. Bassat
中科院分区：
文献类型：
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作者：
T. Xia;Xinglong Xu;Jingping Wang;Chunbo Xu;Fuchang Meng;Zhan Shi;Jie Lian;J. Bassat
采用络合共沉淀法，在100 °C下，添加三乙醇胺和乙二醇，合成了高质量的介孔Fe 3 O 4纳米笼（MFONs）。所制备的Fe 3 O 4纳米笼具有介孔结构和高度均匀的分散性。当用作可充电锂离子电池的阳极材料时，MFONs阳极在高和低电流速率下显示出高比容量和优异的循环性能。在200 mA g-1的电流密度下，第2次循环的放电比容量为876 mAh g-1，第100次循环的放电比容量为830 mAh g-1。即使在1000 mA g−1的高电流密度下，MFONs阳极在300次循环后仍保持573 mAh g− 1的稳定容量。这种上级的电化学性能归因于MFONs独特的介孔笼状结构和高比表面积（133 m2 g-1），这可以为电子传导和Li+存储提供大的电极/电解质接触面积。此外，介孔纳米笼良好的机械柔性可以很容易地缓冲与可逆电极反应相关的大规模体积膨胀/收缩。这些结果表明，MFONs可以作为一种有前途的高性能锂离子电池负极材料。
In this study, high-quality mesoporous Fe3O4nanocages (MFONs) have been synthesized by a facile complex-coprecipitation method at 100 °C with addition of triethanolamine and ethylene glycol. The as-prepared Fe3O4nanocages possess a mesoporous structure and highly uniform dispersion. When used as an anode material for rechargeable lithium-ion batteries, MFONs anode shows high specific capacities and excellent cycling performance at high and low current rates. At a current density of 200 mA g−1, the discharge specific capacities are 876 mAh g−1at the 2nd cycle and 830 mAh g−1at the 100th cycle. Even at the high current density of 1000 mA g−1, MFONs anode still retains a stable capacity of 573 mAh g−1after 300 cycles. This superior electrochemical performance is attributed to the unique mesoporous cage-like structure and high specific surface area (133 m2g−1) of MFONs, which may offer large electrode/electrolyte contact area for the electron conduction and Li+storage. Furthermore, the good mechanical flexibility of the mesoporous nanocages can readily buffer the massive volume expansion/shrinkage associated with the reversible electrode reaction. These results indicate that MFONs can be used as a promising high-performance anode material for lithium-ion batteries.