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首页> 外文期刊>RSC Advances >Synthesis and electrochemical performance of Co2TiO4 and its core-shell structure of Co2TiO4@C as negative electrodes for Li-ion batteries
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Synthesis and electrochemical performance of Co2TiO4 and its core-shell structure of Co2TiO4@C as negative electrodes for Li-ion batteries

机译：CO2TIO4的合成与电化学性能及其CO2TIO4 @ C作为锂离子电池负电极的核心壳结构

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摘要

Spinel Co2TiO4 is synthesised using a polymeric precursor method and used as an efficient negative electrode for Li-ion batteries. Precise full-profile Rietveld refinement proves the formation of a single-phase cubic spinel structure with a lattice parameter of a = 8.4190(9) angstrom, which corresponds to the sample composition of Co2.05Ti0.95O4. Subsequently, a carbon coating around Co2TiO4 is achieved through a simple hydrothermal method. TGA analysis implies that Co2TiO4@C consists of 17 wt% carbon, and the presence of D and G bands was confirmed through Raman analysis. Transmission electron microscopy (TEM) is employed to probe the morphological features, as well as to confirm the carbon coating on Co2TiO4. It shows non uniform shape particles with sizes in the range of 400-750 nm and that the thickness of the carbon coating is 10 nm. The superior electrochemical performance of Co2TiO4@C is confirmed by a higher initial discharge-charge capacity (1283/418 mA h g(-1)), high diffusion coefficient (1.76 x 10(-10) cm(2) s(-1/2)) and lower Rct (after 50 cycles). This is attributed to the increased electrical conductivity and the creation of new active sites due to the synergistic effect of the carbon matrix on Co2TiO4, thereby making it a promising candidate for lithium ion battery applications.
机译：使用聚合物前体方法合成尖晶石CO2TiO4并用作锂离子电池的有效负极。精确的全概况Rietveld改进证明了单相立方尖晶石结构的形成具有= 8.4190（9）埃的晶格参数，其对应于CO 2.05Ti0.95O4的样品组成。随后，通过简单的水热法实现CO 2 TiO 4周围的碳涂层。 TGA分析意味着CO2TiO4 @ C由17wt％碳组成，通过拉曼分析确认D和G带的存在。使用透射电子显微镜（TEM）以探测形态学特征，以及确认CO2TIO4上的碳涂层。它显示出在400-750nm范围内的尺寸的非均匀形状颗粒，并且碳涂层的厚度为10nm。 CO2TiO4 @ C的卓越电化学性能通过较高的初始放电充电容量（1283/418mA Hg（-1）），高扩散系数（1.76×10（-10）cm（2）s（-1 / 2））和下RCT（50次循环后）。这归因于由于CO2TIO4上的碳基质的协同效应，这归因于增加的电导率和新的活性位点的产生，从而使其成为锂离子电池应用的有希望的候选者。

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  • 来源
    《RSC Advances》 |2016年第73期|共11页
  • 作者

    Yuvaraj S.; Vignesh R. Hari; Vasylechko L.; Lee Y. S.; Selvan R. Kalai;

  • 作者单位

    Bharathiar Univ Dept Phys Solid State Ion &

    Energy Devices Lab Coimbatore 641046 Tamil Nadu India;

    Chonnam Natl Univ Fac Appl Chem Engn Gwangju 500757 South Korea;

    Lviv Polytech Natl Univ Semicond Elect Dept 12 Bandera St UA-79013 Lvov Ukraine;

    Chonnam Natl Univ Fac Appl Chem Engn Gwangju 500757 South Korea;

    Bharathiar Univ Dept Phys Solid State Ion &

    Energy Devices Lab Coimbatore 641046 Tamil Nadu India;

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  • 正文语种 eng
  • 中图分类 化学;
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