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首页> 外文期刊>Chemistry: A European journal >Electrochemical In Situ Formation of a Stable Ti-Based Skeleton for Improved Li-Storage Properties: A Case Study of Porous CoTiO3 Nanofibers
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Electrochemical In Situ Formation of a Stable Ti-Based Skeleton for Improved Li-Storage Properties: A Case Study of Porous CoTiO3 Nanofibers

机译：用于改善锂储存性能的稳定Ti基骨架的电化学，用于改善锂储能性质：多孔Cotio3纳米纤维的案例研究

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摘要

Bimetallic transition-metal oxides, which exhibit superior electrochemical properties compared with pristine single-metal oxides, have recently become a topic of significant research interest for applications in lithium-ion batteries (LIBs). Herein, we report a simple and scalable electrospinning method to synthesize porous CoTiO_3 nanofibers as the precursor for nanostructured bimetallic transition-metal oxides formed electrochemically in situ. This strategy ensures uniform mixing and perfect contact between two constituent transition-metal oxides during the lithiation/delithiation process. Furthermore, CoTiO_3 nanofibers based on ultrafine CoTiO_3 nanocrystals are interconnected to form a nano/ microstructured 3D network, which ensures the high stability of the in situ formed structure composed of bimetallic transition-metal oxides, and also fast ion/electron transfer and electrolyte penetration into the electrode. Electrochemical measurements revealed the excellent lithium storage (647 mAhg~(-1) at 0.1 Ag~(-1)) and retention properties (600 mAhg~(-1) at 1 Ag~(-1) after 1200 cycles) of the CoO/TiO_2 electrode. Moreover, the electrochemical reaction mechanism was explored by using ex situ X-ray photoelectric spectroscopy and cyclic voltammetry tests, which confirmed the two-phase reaction processes in the electrodes. These results clearly validate the potential of CoTiO_3 with a unique nano/ microstructured morphology as the precursor for a bimetallic transition-metal oxide for use as the anode material for long-life LIBs.
机译：与原始单金属氧化物相比，具有卓越的电化学性质的双金属过渡金属氧化物最近成为锂离子电池（LIBS）中应用重大研究兴趣的主题。在此，我们报告了一种简单且可伸缩的静电纺丝方法，将多孔CotiO_3纳米纤维合成为原位电化学形成的纳米结构的双金属过渡金属氧化物的前体。该策略确保在锂化/脱水过程中的两个组成过渡金属氧化物之间均匀混合和完美接触。此外，基于超细CotiO_3纳米晶体的CotiO_3纳米纤维互连以形成纳米/微结构化的3D网络，其确保了由双金属过渡金属氧化物组成的原位形成的结构的高稳定性，以及快速离子/电子转移和电解质渗透到电极。电化学测量揭示了优异的锂储存（647mAhg〜（-1），在0.1％〜（-1））和400℃的静脉〜（600mAhg〜（-1）下的合作官） / TiO_2电极。此外，通过使用EX原位X射线光电光谱和循环伏安法试验探索了电化学反应机理，其证实了电极中的两相反应过程。这些结果清楚地验证了CotiO_3的潜力，具有独特的纳米/微结构化形态，作为双金属过渡金属氧化物的前体，用作长寿命Libs的阳极材料。

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  • 来源
    《Chemistry: A European journal》 |2017年第36期|共7页
  • 作者

    Si-Yu Liu; Chao-Ying Fan; Han-Chi Wang; Jing-Ping Zhang; Xing-Long Wu;

  • 作者单位

    National and Local United Engineering Laboratory for Power Batteries and Faculty of Chemistry Northeast Normal University Changchun Jilin 130024 (P. R. China);

    National and Local United Engineering Laboratory for Power Batteries and Faculty of Chemistry Northeast Normal University Changchun Jilin 130024 (P. R. China);

    National and Local United Engineering Laboratory for Power Batteries and Faculty of Chemistry Northeast Normal University Changchun Jilin 130024 (P. R. China);

    National and Local United Engineering Laboratory for Power Batteries and Faculty of Chemistry Northeast Normal University Changchun Jilin 130024 (P. R. China);

    National and Local United Engineering Laboratory for Power Batteries and Faculty of Chemistry Northeast Normal University Changchun Jilin 130024 (P. R. China);

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用化学;
  • 关键词

    charge transfer; in situ formation; lithium-ion batteries; nanostructures; transition metals;

    机译：电荷转移;原位形成;锂离子电池;纳米结构;过渡金属;

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