High-Performing Mesoporous Iron Oxalate Anodes for Lithium-Ion Batteries

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• 作者：Wei An Ang ; Nutan Gupta ; Raghavan Prasanth ; Srinivasan Madhavi
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：December 26, 2012
• 年：2012
• 卷：4
• 期：12
• 页码：7011-7019
• 全文大小：590K
• 年卷期：v.4,no.12(December 26, 2012)
• ISSN：1944-8252

文摘

Mesoporous iron oxalate (FeC₂O₄) with two distinct morphologies, i.e., cocoon and rod, has been synthesized via a simple, scalable chimie douce precipitation method. The solvent plays a key role in determining the morphology and microstructure of iron oxalate, which are studied by field-emission scanning electron microscopy and high-resolution transmission electron microscopy. Crystallographic characterization of the materials has been carried out by X-ray diffraction and confirmed phase-pure FeC₂O₄路2H₂O formation. The critical dehydration process of FeC₂O₄路2H₂O resulted in anhydrous FeC₂O₄, and its thermal properties are studied by thermogravimetric analysis. The electrochemical properties of anhydrous FeC₂O₄ in Li/FeC₂O₄ cells are evaluated by cyclic voltammetry, galvanostatic charge鈥揹ischarge cycling, and electrochemical impedance spectroscopy. The studies showed that the initial discharge capacities of anhydrous FeC₂O₄ cocoons and rods are 1288 and 1326 mA h g^鈥?, respectively, at 1C rate. Anhydrous FeC₂O₄ cocoons exhibited stable capacity even at high C rates (11C). The electrochemical performance of anhydrous FeC₂O₄ is found to be greatly influenced by the number of accessible reaction sites, morphology, and size effects.

Keywords:

iron oxalate; anode materials; electrode materials; lithium-ion batteries; electrochemical properties