TiO2/MoO2 Nanocomposite as Anode Materials for High Power Li-ion Batteries with Exceptional Capacity
TiO2/MoO2 Nanocomposite as Anode Materials for High Power Li-ion Batteries with Exceptional Capacity
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DOI：
10.20964/2018.05.37
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发表时间：
2018-04
影响因子：
1.5
通讯作者：
Dustin Bauer;A. Roberts;Chris L. Starkey;R. Vedarajan;D. Brett;P. Shearing;N. Matsumi;J. Darr
中科院分区：
文献类型：
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作者：
Dustin Bauer;A. Roberts;Chris L. Starkey;R. Vedarajan;D. Brett;P. Shearing;N. Matsumi;J. Darr
采用连续水热合成法合成了纳米MoO2及其纳米复合材料。用X射线衍射仪、X射线光电子能谱、透射电子显微镜和比表面积对两种粉末进行了分析，评价了它们作为锂离子半电池正极材料的活性。循环伏安法和恒电流充放电测量在0.1~3.0V的电位窗口进行，Li/Li+。在低比电流下(0.1Ag-1)，两种材料的比容量都达到了约350mAg-1；与MoO2相比，TiO2MoO2复合电极表现出了优异的倍率行为和循环稳定性，在0.5Ag-1的比电流下，其比容量约为265mAg-1，在比电流为2.5Ag-1的350次循环后，其比容量约为150mAg-1。与MoO2相比，复合材料性能的提高归因于更小的颗粒尺寸，更好的体积变化稳定性(在循环过程中)，以及在循环过程中更低的电荷转移电阻。用TiO2MoO2复合阳极和活性碳(AC)阴极组成的锂离子混合电化学电容器在600W kg-1的功率密度下表现出优异的性能，其能量密度为44Wh kg-1。
Nanoparticles of molybdenum(IV) oxide (MoO 2 ) and a TiO 2 /MoO 2 nanocomposite were synthesised via a continuous hydrothermal synthesis process. Both powders were analysed using XRD, XPS, TEM, and BET and evaluated as active materials in anodes for Li-ion half-cells. Cyclic voltammetry and galvanostatic charge/discharge measurements were carried out in the potential window of 0.1 to 3.0 V vs. Li/Li+. Specific capacities of ca. 350 mAh g -1 were obtained for both materials at low specific currents (0.1 A g -1 ); TiO 2 /MoO 2 composite electrodes showed superior rate behaviour & stability under cycling (compared to MoO 2 ), with stable specific capacities of ca. 265 mAh g -1 at a specific current of 0.5 A g -1 and ca. 150 mAh g -1 after 350 cycles at a specific current of 2.5 A g -1 . The improved performance of the composite material, compared to MoO 2 , was attributed to a smaller particle size, improved stability to volume changes (during cycling), and lower charge transfer resistance during cycling. Li-ion hybrid electrochemical capacitors using TiO 2 /MoO 2 composite anodes and activated carbon (AC) cathodes were evaluated and showed excellent performance with an energy density of 44 Wh kg -1 at a power density of 600 W kg -1 .