材料科学
阴极
镍
相(物质)
锂(药物)
同步加速器
离子
八面体
相变
化学物理
分析化学(期刊)
物理化学
冶金
凝聚态物理
光学
化学
内分泌学
医学
物理
有机化学
色谱法
作者
Sheng Wang,Zhixin Xu,Xun‐Lu Li,Jianming Bai,Enyuan Hu,Seong‐Min Bak,Xiao‐Qing Yang,Yong‐Ning Zhou,Jie Han
出处
期刊:Nano Energy
[Elsevier]
日期:2023-10-24
卷期号:119: 109019-109019
被引量:5
标识
DOI:10.1016/j.nanoen.2023.109019
摘要
In nickel-rich layered cathode materials, three transition metals (TM = Ni, Co and Mn) play critical roles in Li storage performance. However, rate-dependent phase evolution and elemental contribution of nickel-rich cathode materials are not well understood, but very important for further design and development of these cathodes in high-power applications. Here, the rate-dependent phase evolution and elemental contribution of LiNi0.5Mn0.3Co0.2O2 (NMC532) cathode are investigated thoroughly by using time-resolved synchrotron-based in situ X-ray diffraction and absorption techniques. The increase of Ni content in NMC532 has been found to be the main cause of the complex structural changes, resulting in distortion of TM-O6 octahedron and strong static vibration between TM and O coordination. It is revealed that the fast charge (10 and 30C) of NMC532 leads to intermediate Li-poor phases, shrinking of H2 phase region, and prolonged O1 phase. During high-rate charging, Co is oxidized easily in low voltage region, while Ni mainly dominates charge compensation in high voltage region. It is found that delithiation-induced local structure distortion transfers from Ni to Co sites in fast kinetic process. These findings provide in-depth understanding for the fast charge behavior of Ni-rich layered cathode materials, and help to guide further development of advanced high power lithium-ion batteries.
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