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首页> 外文期刊>Energy & environmental science >A highly active nanostructured metallic oxide cathode for aprotic Li-O-2 batteries
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A highly active nanostructured metallic oxide cathode for aprotic Li-O-2 batteries

机译：用于质子惰性Li-O-2电池的高活性纳米结构金属氧化物阴极

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摘要

The aprotic lithium-oxygen cell is based on the reversible reduction of oxygen on a cathode host to form lithium peroxide, and has received much attention in the last few years owing to its promise to offer increased electrochemical energy density beyond that provided by traditional Li-ion batteries. Carbon has been extensively utilized as a host, but it reacts with Li2O2 to form an insulating layer of lithium carbonate resulting in high overpotentials on charge. Establishing a stable, and conductive interface at the porous cathode is a major challenge that has motivated a search for non-carbonaceous cathode materials. Very few suitable materials have been discovered so far. Here we report on the synthesis of the metallic Magneli phase Ti4O7 with a crystallite size between 10-20 nm, and show that a cathode fabricated from this material greatly reduces the overpotential compared to carbon. Oxidation of lithium peroxide on charge starts just above 3 V, comparable to gold and TiC, and the majority (similar to 65%) of oxygen release occurs in the 3-3.5 V window vs. Li+/Li as determined by on-line electrochemical mass spectrometry. Ti4O7 is much lighter and lower cost than gold, easy to prepare, and provides a controlled interface. X-ray photoelectron spectroscopy measurements show that a conductive, self-passivating substoichiometric metal oxide layer is formed at the surface which is important for stability.
机译：非质子锂氧电池基于可逆还原阴极主体上的氧以形成过氧化锂，并且由于其有望提供比传统锂电池更大的电化学能量密度而在近几年受到了广泛关注。离子电池。碳已被广泛用作主体，但它与Li2O2反应形成碳酸锂绝缘层，导致电荷上的高过电势。在多孔阴极上建立稳定且导电的界面是一项重大挑战，这促使人们寻求非碳质阴极材料。迄今为止，很少发现合适的材料。在这里，我们报告了微晶尺寸在10-20 nm之间的金属Magneli相Ti4O7的合成，并表明与碳相比，用这种材料制成的阴极大大降低了过电势。与金和TiC相当，充电时过氧化锂的氧化刚开始在3 V以上，与在线Li + / Li相比，与Li + / Li相比，大部分（大约65％）的氧气释放发生在3-3.5 V窗口内质谱。 Ti4O7比金更轻且成本更低，易于制备，并提供受控的界面。 X射线光电子能谱测量表明，在表面上形成了导电的，自钝化的亚化学计量的金属氧化物层，这对于稳定性很重要。

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  • 来源
    《Energy & environmental science》 |2015年第4期|1292-1298|共7页
  • 作者

    Kundu Dipan; Black Robert; Berg Erik Jaemstorp; Nazar Linda F.;

  • 作者单位

    Univ Waterloo, Dept Chem, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada;

    Univ Waterloo, Dept Chem, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada;

    Univ Waterloo, Dept Chem, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada;

    Univ Waterloo, Dept Chem, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada;

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