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首页> 外文期刊>Nanoscale Horizons >Role of the anatase/TiO2(B) heterointerface for ultrastable high-rate lithium and sodium energy storage performance
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Role of the anatase/TiO2(B) heterointerface for ultrastable high-rate lithium and sodium energy storage performance

机译：锐钛矿/ TiO2（B）异化表面的作用，用于过度高速锂锂和钠储能性能

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摘要

This paper is dedicated to elucidating the role of the anatase/ TiO2(B) heterointerface, which functions as an 'ion reservoir' for dominant pseudocapacitance, for ultrastable high-rate energy storage in both Li-ion and Na-ion batteries (LIBs, SIBs). Dual-phase nanosheets are in situ assembled to form anatase/TiO2(B) nanoflower-shaped anodes via a facile hydrothermal and thermolysis process. The abundant oxygen vacancies on the ultrathin nanosheets favor pseudocapacitive behaviors and fast ionic/electronic transport during Li~+/Na~+ insertion/extraction cycles. The density functional theory calculations combined with ab initio molecular dynamics simulations corroborate the important role of the anatase/TiO2(B) heterointerface in promoting electrochemical kinetics. The heterointerface has much lower adsorption energies of Li~+/Na~+ than in each phase acting alone, and the presence of an internal electric field with a high ionic concentration at the interface ameliorates charge transport. Therefore, the dual-phase anodes deliver ultra-stable electrochemical performance with high specific capacities of 193 and 112 mA h g~(-1) at an exceptionally fast 20 C in LIBs and SIBs, respectively. Their cycling stability is equally remarkable, sustaining reversible capacities of 212 mA h g~(-1) at 10 C and 173 mA h g~(-1) at 5 C after 1000 cycles, respectively. These new findings may help rationally design high-performance multi-functional anodes for next-generation metal-ion batteries.
机译：本文旨在阐明锐钛矿/ TiO2（b）异化表面的作用，该表面用作锂离子和Na离子电池（Libs， sibs）。双相纳米片原位组装成通过容易水热和热解过程形成锐钛矿/ TiO 2（B）纳米滴大阳极。超薄纳米电池上的丰富氧空位有利于Li〜+ / Na +插入/提取循环期间的假壳种行为和快速离子/电子传输。密度函数理论计算与AB初始分子动力学模拟相结合证实了锐钛矿/ TiO2（B）异化表面在促进电化学动力学中的重要作用。异胚表面具有远低于单独作用的Li〜+ / Na〜+的吸附能量，并且在界面处具有高离子浓度的内部电场的存在改善电荷输送。因此，双相阳极在自由的20c中，在Libs和Sibs中，在193和112mA h g〜（-1）的高比电容中，分别在193和112mA h g〜（-1）中提供超稳定的电化学性能。它们的循环稳定性同样显着，分别在1000次循环后在5℃下在10℃和173mA H（-1）下维持212mA H G〜（-1）的可逆容量。这些新发现可能有助于为下一代金属离子电池提供合理设计高性能多功能阳极。

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  • 来源
    《Nanoscale Horizons》 |2020年第1期|共13页
  • 作者

    Guilong Liu; Hong-Hui Wu; Qiangqiang Meng;

  • 作者单位

    Key Laboratory of Function-oriented Porous Materials ofHenan Province College of Chemistry and Chemical Engineering Luoyang Normal University Luoyang 471934 Henan P. R China.;

    Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China;

    Key Laboratory for Advanced Technology in Environmental Protection ofjiangsu Province Yancheng Institute of Technology Yancheng P. R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 分子物理学、原子物理学;工程材料学;
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