Operando X-ray Absorption Study of the Redox Processes Involved upon Cycling of the Li-Rich Layered Oxide Li1.20Mn0.54Co0.13Ni0.13O2 in Li Ion Batteries
Operando X-ray Absorption Study of the Redox Processes Involved upon Cycling of the Li-Rich Layered Oxide Li1.20Mn0.54Co0.13Ni0.13O2 in Li Ion Batteries
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DOI：
10.1021/jp412197z
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发表时间：
2014-03-20
影响因子：
3.7
通讯作者：
Belin, S.
中科院分区：
文献类型：
--
作者：
Koga, H.;Croguennec, L.;Belin, S.
对Li1.20Mn0.54Co0.13Ni0.13O2层状氧化物在锂电池第一次和第二次充放电过程中，所有三种过渡金属的原子和电子局域结构的变化进行了原位X射线吸收光谱研究。实验是在 Synchrotron SOLEIL 的 SAMBA 光束线上使用 Quick-XAS 单色仪进行的，通过在电池循环期间每 3 分钟在两个能量范围（[Mn, Co] 和 [Co, Ni]）之间跳边来记录三个 K 边。特别是在 Mn K 边缘获得的结果完全支持氧作为氧化还原中心参与这种富含锂和锰的层状材料的可逆充放电反应，而不仅仅是氧损失，如之前提出的。
Operando X-ray absorption spectroscopy investigations have been carried out to follow changes in the atomic and electronic local structures of all three transition metals for the Li1.20Mn0.54Co0.13Ni0.13O2 layered oxide during the first and second charges and discharges of lithium batteries. The experiments were performed using a Quick-XAS monochromator on the SAMBA beamline at Synchrotron SOLEIL to record the three K-edges by edge-jumping between two energy ranges ([Mn, Co] and [Co, Ni]) every 3 min during the cycling of the battery. The results obtained especially at the Mn K-edge fully support the participation of oxygen in the reversible charge-discharge reaction of this Li- and Mn-rich layered material as a redox center and not only with oxygen loss, as was proposed previously.