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首页> 外文期刊>Journal of industrial and engineering chemistry >Comparative studies of electrochemical performance and characterization of TiO2/graphene nanocomposites as anode materials for Li-secondary batteries
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Comparative studies of electrochemical performance and characterization of TiO2/graphene nanocomposites as anode materials for Li-secondary batteries

机译：TiO2 /石墨烯纳米复合材料的电化学性能和表征对锂二次电池阳极材料的比较研究

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Using graphene oxide (GO) and titanium dioxide (TiO2), various types of composites comprised of graphene-bonded and grafted anatase TiO2 were synthesized without employing a cross-linking reagent in this study. Graphene sheets were uniformly dispersed among the TiO2 particles, to enhance the cyclability and electronic conductivity of the TiO2 anode for lithium ion batteries. A composite of GO prepared with three types of TiO2 (nanoparticles, nanorods, nanofibers) were synthesized by hydrothermal followed by calcination treatment. The reduction of GO increased simultaneously after calcination under argon atmosphere at 400 degrees C for 4 h. To achieve overall better electrochemical performance we used the anatase type of TiO2. The physicochemical properties were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-Ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Surface properties were measured by the Brunauer-Emmett-Teller (BET) & Barrett-Joyner-Halenda (BJH) method. The electrochemical properties were also investigated by Galvanostatic charge-discharge and Electrochemical Impedance Spectra (EIS). TiO2 nanoparticles composite with graphene delivered rate capability of 155 mAh g(-1) at 0.5 C and restored the rate capacity of 109 mAh g(-1) after 20 C, with a capacity loss of 30%. TiO2 nanorods composite with graphene benefited from its unique morphology exhibited rate capability of 124 mAh g(-1) at 0.5 C and regain the rate capability of 97 mAh g(-1), with a capacity loss of 22%. In addition, TiO2 nanofibers graphene composite with low surface area 19 m2 g(-1) and pore volume of 0.086 cm(3) g(-1), transported rate capability of 68 mAh g(-1) at 0.5 C and recover the rate capacity of 64 mAh g-1 after 20 C owing to its higher value of lithium-ion diffusion coefficient. (C) 2018 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：使用石墨烯（GO）和二氧化钛（TiO 2），合成包括石墨烯键合和接枝锐钛矿TiO2的各种复合材料，而不使用该研究中的交联试剂。将石墨烯片均匀地分散在TiO 2颗粒中，以增强用于锂离子电池的TiO2阳极的可循环性和电子电导率。用三种类型的TiO 2（纳米颗粒，纳米棒，纳米纤维）制备的去的复合材料通过水热合成，然后通过煅烧处理来合成。在氩气氛下在400℃下煅烧后，在400℃下煅烧后的再同时增加。为了实现整体更好的电化学性能，我们使用了锐钛矿类型的TiO2。通过扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线粉末衍射（XRD），X射线光电子能谱（XPS）和拉曼光谱，表征物理化学性质。通过Brunauer-Emmett-Teller（Bet）和Barrett-Joyner-Halenda（BJH）方法测量表面性质。还通过GALVANOTATIC电荷 - 放电和电化学阻抗谱（EIS）研究了电化学性质。 TiO2纳米颗粒复合材料，具有0.5℃的155mAhg（-1）的速率能力，并在20℃后恢复109mAh（-1）的速率容量，容量损失为30％。具有石墨烯的TiO2纳米棒与石墨烯的复合材料受益于其独特的形态表现出124mAhg（-1）的速率能力，0.5℃，并重新获得97mAhg（-1）的速率能力，容量损失为22％。此外，TiO2纳米纤维石墨烯复合材料具有低表面积19m 2 G（-1）和0.086cm（3 )g（-1）的孔体积，68mAhg（-1）的输送速率能力在0.5℃下恢复由于其锂离子扩散系数的较高值，20℃速率为64 mAh G-1的速率。 （c）2018年韩国工程和工程化学学会。 elsevier b.v出版。保留所有权利。

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