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首页> 外文期刊>RSC Advances >Surface modified Li4Ti5O12 by paper templated approach for enhanced interfacial Li+ charge transfer in Li-ion batteries
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Surface modified Li4Ti5O12 by paper templated approach for enhanced interfacial Li+ charge transfer in Li-ion batteries

机译：表面改性Li4Ti5O12通过纸张模板方法进行锂离子电池增强界面Li +电荷转移

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摘要

The Li4Ti5O12 (LTO) and lithium silicate (LS) surface modified LTO have been demonstrated by a unique paper templated method. Comparative study of structural characterization with electrochemical analysis was demonstrated for pristine and modified Li4Ti5O12. Structural and morphological study shows the existence of the cubic spinel structure with highly crystalline 250-300 nm size particles. The LS modified LTO shows the deposition of 10-20 nm sized LS nanoparticles on cuboidal LTO. Further, X-ray photoelectron spectroscopy (XPS) confirms the existence of Li2SiO3 (LS) in the modified LTO. The electrochemical performance was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge. The modified LTO with 2% LS (LTS2) exhibited excellent rate capability compare to pristine LTO i.e. 182 mA h g(-1) specific capacity at a current rate, 50 mA g(-1) with remarkable cycling stability up to 1100 cycles at a current rate of 800 mA g(-1). The lithium ion full cell of modified LTO with LS as an anode and LiCoO2 as a cathode exhibited a remarkably reversible specific capacity i.e. 110 mA h g(-1). Both electronic and ionic conductivities of pristine LTO are observed to be enhanced by incorporation of appropriate amount of LS in LTO due to a larger surface contact at the interface of electrode and electrolyte. More significantly, the versatile paper templated synthesis approach of modified LTO with LS provides densely packed highly crystalline particles. Additionally, it exhibits lower Warburg coefficient and higher Li ion diffusion coefficient which in turn accelerate the interfacial charge transfer process, which is responsible for enhanced stable electrochemical performance. The detailed mechanism is expressed and elaborated for better understanding of enhanced electrochemical performance due to the surface modification.
机译：通过独特的纸张模板方法证明了Li4Ti5O12（LTO）和硅酸锂（LS）表面改性LTO。对电化学分析结构表征的比较研究进行了初步和改性Li4Ti5O12。结构和形态学研究表明，具有高结晶250-300nm尺寸颗粒的立方尖晶石结构的存在。 LS改性LTO显示在立方体LTO上的10-20nm大小的LS纳米颗粒的沉积。此外，X射线光电子能谱（XPS）证实了改性LTO中的Li2SiO 3（LS）的存在。通过循环伏安法（CV），电化学阻抗谱（EIS）和电镀电荷放电研究了电化学性能。具有2％LS（LTS2）的改性LTO表现出优异的速率能力，与原始LTO IE 182 mA Hg（-1）特定容量以电流速率，50 mA g（-1），具有显着的循环稳定性，可在a下呈显着1100次循环电流率为800 mA g（-1）。用LS作为阳极和LiCoO2作为阴极的改性LTS的锂离子全细胞表现出显着的可逆特定容量，即110mA H（-1）。由于电极和电解质界面的较大表面接触，通过在LTO中掺入适量的LS，观察到原始LTO的电子和离子导电性。更重要的是，用LS改性LTO的多功能纸模板合成方法提供密集的高度结晶颗粒。另外，它表现出较低的Warburg系数和更高的Li离子扩散系数，其又加速了界面电荷转移过程，这负责增强的稳定电化学性能。表达并详细表达了详细的机制，以便更好地理解由于表面改性引起的增强电化学性能。

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  • 来源
    《RSC Advances》 |2018年第67期|共9页
  • 作者

    Kawade Ujjwala V.; Jayswal Manish S.; Ambalkar Anuradha A.; Kadam Sunil R.; Panmand Rajendra P.; Ambekar Jalinder D.; Kulkarni Milind V.; Kale Bharat B.;

  • 作者单位

    Minist Elect &

    Informat Technol MeitY C MET Pune 411008 Maharashtra India;

    Minist Elect &

    Informat Technol MeitY C MET Pune 411008 Maharashtra India;

    Minist Elect &

    Informat Technol MeitY C MET Pune 411008 Maharashtra India;

    Savitribai Phule Pune Univ Dept Phys Pune 411007 Maharashtra India;

    Minist Elect &

    Informat Technol MeitY C MET Pune 411008 Maharashtra India;

    Minist Elect &

    Informat Technol MeitY C MET Pune 411008 Maharashtra India;

    Minist Elect &

    Informat Technol MeitY C MET Pune 411008 Maharashtra India;

    Minist Elect &

    Informat Technol MeitY C MET Pune 411008 Maharashtra India;

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  • 正文语种 eng
  • 中图分类 化学;
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