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High capacity rock salt type Li2MnO3-delta thin film battery electrodes

机译：高容量岩盐型Li2MNO3-Delta薄膜电池电极

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摘要

Recent investigations of layered, rock salt and spinel-type manganese oxides in composite powder electrodes revealed the mutual stabilization of the Li-Mn-O compounds during electrochemical cycling. A novel approach of depositing such complex compounds as an active cathode material in thin-film battery electrodes is demonstrated in this work. It shows the maximum capacity of 226 mA h g(-1) which is superior in comparison to that of commercial LiMn2O4 powder as well as thin films. Reactive ion beam sputtering is used to deposit films of a Li2MnO3-delta composition. The method allows for tailoring of the active layer's crystal structure by controlling the oxygen partial pressure during deposition. Electron diffractometry reveals the presence of layered monoclinic and defect rock salt structures, the former transforms during cycling and results in thin films with extraordinary electrochemical properties. X-ray photoelectron spectroscopy shows that a large amount of disorder on the cation sub-lattices has been incorporated in the structure, which is beneficial for lithium migration and cycle stability.
机译：复合粉末电极中分层，岩盐和尖晶石型锰氧化物的最近研究显示了在电化学循环期间Li-Mn-O化合物的相互稳定性。在这项工作中，证明了一种像薄膜电池电极中的活性阴极材料沉积这种复合化合物的新方法。它显示了与商业Limn2O4粉末以及薄膜相比的226 mA H G（-1）的最大容量。反应离子束溅射用于沉积Li2MNO3-δ组合物的薄膜。该方法允许通过在沉积期间控制氧分压来纵向剪裁有源层的晶体结构。电子衍射测定术揭示了层状单斜岩和缺陷岩盐结构的存在，前者在循环期间转化，并导致具有非凡电化学性质的薄膜。 X射线光电子能谱表明，阳离子晶格上的大量病症已掺入结构中，这是有利于锂迁移和循环稳定性的。

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  • 来源
    《RSC Advances》 |2020年第7期|共10页
  • 作者

    Mueller Henry A.; Joshi Yug; Hadjixenophontos Efi; Peter Claudia; Csiszar Gabor; Richter Gunther; Schmitz Guido;

  • 作者单位

    Univ Stuttgart Inst Mat Sci Chair Mat Phys Heisenbergstr 3 D-70569 Stuttgart Germany;

    Univ Stuttgart Inst Mat Sci Chair Mat Phys Heisenbergstr 3 D-70569 Stuttgart Germany;

    Univ Stuttgart Inst Mat Sci Chair Mat Phys Heisenbergstr 3 D-70569 Stuttgart Germany;

    Univ Stuttgart Inst Mat Sci Chair Mat Phys Heisenbergstr 3 D-70569 Stuttgart Germany;

    Univ Stuttgart Inst Mat Sci Chair Mat Phys Heisenbergstr 3 D-70569 Stuttgart Germany;

    Max Planck Inst Intelligent Syst Heisenbergstr 3 D-70569 Stuttgart Germany;

    Univ Stuttgart Inst Mat Sci Chair Mat Phys Heisenbergstr 3 D-70569 Stuttgart Germany;

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  • 正文语种 eng
  • 中图分类 化学;
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