Electronic structure of Li1+ x [Mn0.5Ni0.5]1－ x O2 studied by photoemission and x-ray absorption spectroscopy
Electronic structure of Li1+ x [Mn0.5Ni0.5]1－ x O2 studied by photoemission and x-ray absorption spectroscopy
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光电发射和X射线吸收光谱研究Li1+ x [Mn0.5Ni0.5]1－ x O2的电子结构
DOI：
10.1063/1.4927239
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发表时间：
2015
影响因子：
4
通讯作者：
and T. Mizokawa
中科院分区：
文献类型：
--
作者：
Y. Yokoyama;D. Ootsuki;T. Sugimoto;H. Wadati;J. Okabayashi;Xu Yang;Fei Du;Gang Chen;and T. Mizokawa
用X射线光电子能谱和吸收光谱研究了锂离子电池正极材料Li{sub1+x}[Mn{sub0.5}Ni{sub0.5}]{sub1−x}O{sub2}(x = 0.0 0和0.0 5)的电子结构。结果表明，Mn和Ni的价态基本上分别为4+和2+。而x = 0.0 0样品中的Mn{sup3+}组分随着实验灵敏度的增加而逐渐增加，表明Li和Ni之间的位置交换引入了Jahn-Teller活性的Mn{sup3+}离子。在x = 0.0 5样品中，Mn{sup3+}组分变得可以忽略不计，这表明过量的Li抑制了位交换，并去除了Jahn-Teller活性的Mn{sup3+}。
We have studied the electronic structure of Li{sub 1+x}[Mn{sub 0.5}Ni{sub 0.5}]{sub 1−x}O{sub 2} (x = 0.00 and 0.05), one of the promising cathode materials for Li ion battery, by means of x-ray photoemission and absorption spectroscopy. The results show that the valences of Mn and Ni are basically 4+ and 2+, respectively. However, the Mn{sup 3+} component in the x = 0.00 sample gradually increases with the bulk sensitivity of the experiment, indicating that the Jahn-Teller active Mn{sup 3+} ions are introduced in the bulk due to the site exchange between Li and Ni. The Mn{sup 3+} component gets negligibly small in the x = 0.05 sample, which indicates that the excess Li suppresses the site exchange and removes the Jahn-Teller active Mn{sup 3+}.