Neutron Diffraction and Electrochemical Study of FeNb11O29/Li11FeNb11O29 for Lithium Battery Anode Applications

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• 作者：Ilya Pinus ; Michele Catti ; Riccardo Ruffo ; Matteo M. Salamone ; Claudio M. Mari
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：March 25, 2014
• 年：2014
• 卷：26
• 期：6
• 页码：2203-2209
• 全文大小：423K
• 年卷期：v.26,no.6(March 25, 2014)
• ISSN：1520-5002

文摘

Lithium was found to be inserted into FeNb₁₁O₂₉ by reaction with n-butyllithium, producing Li₁₁FeNb₁₁O₂₉ samples with good crystallinity, and the Amma crystallographic-shear structures of both compounds (a = 28.7093(6)/28.4036(4), b = 3.8256(1)/4.08447(9), c = 20.6241(4)/20.7067(2) 脜, respectively) were Rietveld-refined by high-resolution neutron powder diffraction. Lithium atoms of Li₁₁FeNb₁₁O₂₉ were located both in 4-fold- and in 5-fold-coordinated positions, lying respectively inside and between the 4 脳 3 perovskite blocks of Nb(Fe)O₆ octahedra. Electrochemical measurements on a FeNb₁₁O₂₉/ Li_xFeNb₁₁O₂₉ electrode vs metallic Li showed that lithium can be intercalated/deintercalated reversibly in the 1.1鈥?.5 V range with a stable capacity of 185 mAh/g, which roughly corresponds to 11 Li atoms per f.u. as obtained by chemical lithiation. The rather uniform structural distribution found for Li atoms is consistent with the good electrode reversibility, which makes this material promising as anode in rechargeable lithium batteries.