頁籤選單縮合
題名 | Local Structure and Electronic States of Li(Mn Cox)O[feb2]Studied by X-ray Absorption Spectroscopy= |
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作者 | 沈志鴻; 劉如熹; 張凌雲; 李志甫; 陳錦明; Shen, C. H.; Liu, R. S.; Jang, L. Y.; Lee, J. F.; Chen, J. M.; |
期刊 | Journal of the Chinese Chemical Society |
出版日期 | 20021000 |
卷期 | 49:5 2002.10[民91.10] |
頁次 | 頁841-850 |
分類號 | 343.38 |
語文 | eng |
關鍵詞 | X-ray absorption near-edge structure; XANES; Extended X-ray absorption fine structure; EXAFS; Li(Mn Cox)O[feb2]; Lithium-ion based secondary battery; |
英文摘要 | The local structure and electronic states of Co□ substituted lithium manganate spinels of the composition Li(Mn□Co□)O□ (0≦x≦0.4) have been probed by X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopies at the Mn and Co edges. The substitution of Co□ into the Mn sites causes an oxidation of Mn□ to Mn□, decreasing the localized Jahn-Teller distortion of the lattice. This in turn leads to a shortening of the Mn-O(Mn) bond length and a reductiom in local structural disorder of the Mn(Co)O□ octahedra. The data show that the replacement of □ Mn□ by □ Co□ in the octahedral sites of the spinel structure eliminates the local disorder in the lattice around the Mn□O□ octahedra which are distorted by Jahn-Teller stabilization of the electronic state. |
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