X-ray Absorption Studies in Spinel-Type LiMn2O4☆
X-ray Absorption Studies in Spinel-Type LiMn2O4☆
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DOI：
10.1006/jssc.1997.7291
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发表时间：
1997-02
影响因子：
5.4
通讯作者：
Ru‐Shi Liu;L. Jang;Jin‐Ming Chen;Yi-Min Tsai;Y. D. Hwang;R. G. Liu
中科院分区：
文献类型：
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作者：
Ru‐Shi Liu;L. Jang;Jin‐Ming Chen;Yi-Min Tsai;Y. D. Hwang;R. G. Liu
摘要：采用MnK-和l23边缘x射线吸收近边缘结构（XANES）光谱研究了尖晶石型limn2o4作为二次电池正极材料的电子结构。根据XANES光谱中与有效电荷相关的吸收峰的能移，确定了limn2o4中Mn的价态为~ 4+。这表明低价Li+离子在Mn位点的化学取代可能导致Mn的高价位。
Abstract The electronic structure of the spinel-type LiMn2O4as the cathode material for the application in secondary batteries was probed using both MnK- andL23-edge X-ray absorption near edge structure (XANES) spectra. Based on the energy shifts of the absorption peaks in the XANES spectrum correlated to the effective charge, the valence of Mn in LiMn2O4was determined to be ∼4+. This suggests that the chemical substitution of low valent Li+ions into the Mn sites is possible to result in high valence of Mn.