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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Overview of the Oxygen Behavior in the Degradation of Li2MnO3 Cathode Material
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Overview of the Oxygen Behavior in the Degradation of Li2MnO3 Cathode Material

机译：Li2MNO3阴极材料降解中的氧行为概述

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摘要

The Li2MnO3 cathode material is vulnerable to complex degradation behaviors during the operation of battery although it has attracted much attention recently due to its potentially large capacity. In this study, we comprehensively examined the degradation process in Li2MnO3, using theoretical density functional computations as well as experimental techniques (in situ X-ray absorption near edge structure spectroscopy, X-ray diffraction, and Raman spectroscopy). Our study reveals that during the delithiation process, the Li ions mixed in the Mn layer are removed together with those in the Li layer, thereby inducing the release of oxygen atoms. The oxygen loss reaction is energetically favorable at the highly delithiated states, and it can reduce the plateau voltage in the charging curve. Such oxygen loss was observed during or even before the second cycle and furthermore it accelerates the phase transformation of the layered structure to a spinel one. Our results also suggest that oxygen release can be prevented when H ions are exchanged with Li ions during the charging process.
机译：Li2MNO3阴极材料在电池的运行过程中容易受到复杂的降解行为，尽管由于其潜在的大容量，它最近引起了很多关注。在这项研究中，我们全面地检查了Li2MNO3中的降解过程，使用理论密度函数计算以及实验技术（原位X射线吸收附近的边缘结构光谱，X射线衍射和拉曼光谱）。我们的研究表明，在不同的过程中，在Mn层中混合的Li离子与Li层中的那些一起去除，从而诱导氧原子的释放。氧气损失反应在高型不同的状态下能够充满活力，可以降低充电曲线中的平台电压。在第二循环期间或甚至在第二周期之前观察到这种氧气损失，此外，它将层状结构的相变化加速到尖晶石中。我们的结果还表明，当在充电过程中用Li离子交换H离子时，可以防止氧释放。

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    Cho Eunseog; Kim Kihong; Jung Changhoon; Seo Seung-Woo; Min Kyoungmin; Lee Hyo Sug; Park Gyeong-Su; Shin Jaikwang;

  • 作者单位

    Samsung Adv Inst Technol Platform Technol Lab 130 Samsung Ro Suwon 16678 Gyeonggi Do South Korea;

    Samsung Adv Inst Technol Platform Technol Lab 130 Samsung Ro Suwon 16678 Gyeonggi Do South Korea;

    Samsung Adv Inst Technol Platform Technol Lab 130 Samsung Ro Suwon 16678 Gyeonggi Do South Korea;

    Samsung Adv Inst Technol Platform Technol Lab 130 Samsung Ro Suwon 16678 Gyeonggi Do South Korea;

    Samsung Adv Inst Technol Platform Technol Lab 130 Samsung Ro Suwon 16678 Gyeonggi Do South Korea;

    Samsung Adv Inst Technol Platform Technol Lab 130 Samsung Ro Suwon 16678 Gyeonggi Do South Korea;

    Samsung Adv Inst Technol Platform Technol Lab 130 Samsung Ro Suwon 16678 Gyeonggi Do South Korea;

    Samsung Adv Inst Technol Platform Technol Lab 130 Samsung Ro Suwon 16678 Gyeonggi Do South Korea;

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  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
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