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首页> 外文期刊>Advanced energy materials >Breathable Carbon-Free Electrode: Black TiO2 with Hierarchically Ordered Porous Structure for Stable Li-O-2 Battery
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Breathable Carbon-Free Electrode: Black TiO2 with Hierarchically Ordered Porous Structure for Stable Li-O-2 Battery

机译：透气的无碳电极：黑色TiO2，具有分级排列的多孔结构，用于稳定的Li-O-2电池

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摘要

This paper introduces oxygen-deficient black TiO2 with hierarchically ordered porous structure fabricated by a simple hydrogen reduction as a carbon- and binder-free cathode, demonstrating superior energy density and stability. With the high electrical conductivity derived from oxygen vacancies or Ti3+ ions, this unique electrode features micrometer-sized voids with mesoporous walls for the effective accommodation of Li2O2 toroid and for the rapid transport of reaction molecules without the electrode being clogged. In the highly ordered architecture, toroidal Li2O2 particles are guided to form with a regular size and separation, which induces the most of Li2O2 external surface to be directly exposed to the electrolyte. Therefore, large Li2O2 toroids (approximate to 300 nm) grown from solution can be effectively charged by incorporating a soluble catalyst, resulting in a very small polarization (approximate to 0.37 V). Furthermore, disordered nanoshell in black TiO2 is suggested to protect the oxygen-deficient crystalline core, by which oxidation of Ti3+ is kinetically impeded during battery operation, leading to the enhanced electrode stability even in a highly oxidizing environment under high voltage (approximate to 4 V).
机译：本文介绍了通过简单的氢还原反应制成的无氧黑色TiO2，它具有分层有序的多孔结构，作为无碳和无粘结剂的阴极，具有优异的能量密度和稳定性。凭借源自氧空位或Ti3 +离子的高电导率，这种独特的电极具有微米尺寸的空隙和中孔壁，可有效容纳Li2O2环面材料并快速运输反应分子而不会堵塞电极。在高度有序的体系结构中，环形Li2O2颗粒被引导形成规则的大小和间距，这导致大部分Li2O2外表面直接暴露于电解质中。因此，通过掺入可溶性催化剂可以有效地使从溶液中生长出来的较大的Li2O2环形电极（约300 nm）充电，从而产生非常小的极化（约0.37 V）。此外，建议使用黑色TiO2中无序的纳米壳来保护缺氧的晶核，从而在电池运行过程中动力学上阻碍Ti3 +的氧化，即使在高电压（约4 V）的高氧化环境中也能提高电极稳定性。 ）。

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  • 来源
    《Advanced energy materials》 |2017年第19期|1700814.1-1700814.11|共11页
  • 作者

    Kang Joonhyeon; Kim Jinyoung; Lee Sangheon; Wi Sungun; Kim Chunjoong; Hyun Seungmin; Nam Seunghoon; Park Yongjoon; Park Byungwoo;

  • 作者单位

    Seoul Natl Univ, Res Inst Adv Mat, Dept Mat Sci & Engn, WCU Hybrid Mat Program, Seoul 08826, South Korea;

    Kyonggi Univ, Dept Adv Mat Engn, Suwon 16227, Gyeonggi Do, South Korea;

    Seoul Natl Univ, Res Inst Adv Mat, Dept Mat Sci & Engn, WCU Hybrid Mat Program, Seoul 08826, South Korea;

    Seoul Natl Univ, Res Inst Adv Mat, Dept Mat Sci & Engn, WCU Hybrid Mat Program, Seoul 08826, South Korea;

    Chungnam Natl Univ, Dept Mat Sci & Engn, Daejeon 34134, South Korea;

    KIMM, Nano Mech Syst Res Div, Dept Nano Mech, Daejeon 34103, South Korea;

    KIMM, Nano Mech Syst Res Div, Dept Nano Mech, Daejeon 34103, South Korea;

    Kyonggi Univ, Dept Adv Mat Engn, Suwon 16227, Gyeonggi Do, South Korea;

    Seoul Natl Univ, Res Inst Adv Mat, Dept Mat Sci & Engn, WCU Hybrid Mat Program, Seoul 08826, South Korea;

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  • 正文语种 eng
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  • 关键词

    black TiO2; hierarchically ordered structures; Li-O-2 batteries; Li2O2 toroid; stability;

    机译：黑色TiO2;层级有序结构;Li-O-2电池;Li2O2环面;稳定性;

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