State Key Laboratory of Organic-Inorganic Composites, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology , Beijing 100029, China.
School of Materials Science & Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology , Beijing 100081, China.
ACS Appl Mater Interfaces. 2016 Oct 12;8(40):26878-26885. doi: 10.1021/acsami.6b09496. Epub 2016 Sep 28.
Transition metal oxides can be considered as appealing candidates for sodium ion battery anode materials because these low-cost materials possess high capacity and enhanced safety. However, the practical application of these materials is usually limited by their low electronic conductivity and serious volume change during the charging-discharging process. Herein, we report the fabrication of 3D-0D graphene-FeO quantum dot hybrids by a facile one-pot hydrothermal approach as anode materials for sodium-ion batteries. FeO quantum dots with an average size of 4.9 nm are anchored on the surface of 3D structured graphene nanosheets homogeneously. Such unique hierarchical structure are advantageous for enlarging the electrode/electrolyte interface area and enhancing the electrochemical activity of the hybrid materials, inhibiting particle aggregation of FeO and accommodating their volume change during the charging-discharging process as well as enabling fast diffusion of electrons and rapid transfer of electrolyte ions. Consequently, the 3D-0D graphene-FeO quantum dot hybrids exhibit ultrahigh sodium storage capacity (525 mAh g at 30 mA g), outstanding cycling stability (312 mAh g after 200 cycles at 50 mA g) and superior rate performance (56 mAh g at 10 A g).
过渡金属氧化物可以被认为是钠离子电池阳极材料的有吸引力的候选物，因为这些低成本材料具有高容量和增强的安全性。然而，这些材料的实际应用通常受到其在充放电过程中电子导电性低和体积变化严重的限制。在此，我们通过简便的一锅水热法报告了 3D-0D 石墨烯-FeO 量子点杂化物的制备，作为钠离子电池的阳极材料。平均尺寸为 4.9nm 的 FeO 量子点均匀地锚定在 3D 结构的石墨烯纳米片表面上。这种独特的分层结构有利于扩大电极/电解质界面面积，提高杂化物的电化学活性，抑制 FeO 颗粒聚集，并在充放电过程中容纳其体积变化，以及使电子和电解质离子快速扩散。因此，3D-0D 石墨烯-FeO 量子点杂化物表现出超高的储钠容量（在 30mA/g 时为 525mAh/g）、优异的循环稳定性（在 50mA/g 时 200 次循环后为 312mAh/g）和卓越的倍率性能（在 10A/g 时为 56mAh/g）。
