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首页> 外文期刊>Advanced energy materials >Operando Lithium Dynamics in the Li-Rich Layered Oxide Cathode Material via Neutron Diffraction
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Operando Lithium Dynamics in the Li-Rich Layered Oxide Cathode Material via Neutron Diffraction

机译：通过中子衍射锂富含层氧化物阴极材料中的Operando锂动力学

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摘要

Neutron diffraction under operando battery cycling is used to study the lithium and oxygen dynamics of high Li-rich Li(Lix/3Ni(3/8-3x/8)Co((1/4-x/4))Mn(3/8+7x/24)O2 (x = 0.6, HLR) and low Li-rich Li(Lix/3Ni(1/3-x/3)Co(1/3-x/3)Mn(1/3+x/3)O2 (x = 0.24, LLR) compounds that exhibit different degrees of oxygen activation at high voltage. The measured lattice parameter changes and oxygen position show largely contrasting changes for the two cathodes where the LLR exhibits larger movement of oxygen and lattice contractions in comparison to the HLR that maintains relatively constant lattice parameters and oxygen position during the high voltage plateau until the end of charge. Density functional theory calculations show the presence of oxygen vacancy during the high voltage plateau; changes in the lattice parameters and oxygen position are consistent with experimental observations. Lithium migration kinetics for the Li-rich material is observed under operando conditions for the first time to reveal the rate of lithium extraction from the lithium layer, and transition metal layer is related to the different charge and discharge characteristics. At the beginning of charging, the lithium extraction predominately occurs within the lithium layer. Once the high voltage plateau is reached, the lithium extraction from the lithium layer slows down and extraction from the transition metal layer evolves at a faster rate.
机译：Officando电池循环下的中子衍射用于研究高锂Li的锂和氧动力学（LiX / 3ni（3/8-3x / 8）Co（（1/4-x / 4））Mn（3 / 8 + 7x / 24）O 2（x = 0.6，HLR）和低富锂li（LiX / 3ni（1/3-x / 3）Co（1/3-x / 3）Mn（1/3 + x / 3）O2（x = 0.24，LLR）化合物，其在高电压下表现出不同程度的氧气激活。测量的晶格参数变化和氧位置在氧气和晶格收缩较大运动的两个阴极上显示出很大的对比变化与HLR相比，在高压平台期间保持相对恒定的晶格参数和氧位置直到充电结束。密度函数理论计算显示高压平台期间的氧空位的存在;晶格参数和氧位置的变化是与实验观察一致。富含富含材料的锂迁移动力学在Operando条件下观察到R影响来自锂层的锂萃取速率，过渡金属层与不同的电荷和放电特性有关。在充电开始时，锂提取主要发生在锂层内。一旦达到高压平台，就锂层的锂萃取减速并从过渡金属层以更快的速率提取。

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  • 来源
    《Advanced energy materials》 |2016年第7期|1502143.1-1502143.7|共7页
  • 作者

    Liu Haodong; Chen Yan; Hy Sunny; An Ke; Venkatachalam Subramanian; Qian Danna; Zhang Minghao; Meng Ying Shirley;

  • 作者单位

    Univ Calif San Diego Dept NanoEngn La Jolla CA 92093 USA;

    Oak Ridge Natl Lab Chem & Engn Mat Div Oak Ridge TN 37830 USA;

    Univ Calif San Diego Dept NanoEngn La Jolla CA 92093 USA;

    Oak Ridge Natl Lab Chem & Engn Mat Div Oak Ridge TN 37830 USA;

    Envia Syst 7979 Gateway Bldg Suite 101 Newark CA 94560 USA;

    Univ Calif San Diego Dept NanoEngn La Jolla CA 92093 USA;

    Univ Calif San Diego Dept NanoEngn La Jolla CA 92093 USA;

    Univ Calif San Diego Dept NanoEngn La Jolla CA 92093 USA;

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