Ilmenite, general formula FeTiO 3 , has been proposed as possible conversion anode material for lithium and sodium ion batteries, with theoretical capacity of 530 mAhg ‐1 . Experimentally, the observed specific capacity for pristine ilmenite is far away from the theoretical value; for this reason, the control of morphology via alkaline hydrothermal treatment has been proposed as possible strategy to improve the electrochemical performance. At the same time FeTiO 3 is prone to react with sodium and potassium hydroxide, as already demonstrated by studies on the degradation of ilmenite for the extraction of TiO 2 . In this paper we demonstrate that the alkaline treatment does not induce a morphological modification of the FeTiO 3 powders but involved the degradation of the precursor material with the formation of different phases. A complete physicochemical and electrochemical characterization is performed with the aim of correlating structural and functional properties of the obtained products.

中文翻译：

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FeTiO3作为钠离子电池的负极材料：从形貌控制到分解

钛铁矿，通式为FeTiO 3，已被建议作为锂和钠离子电池的转换阳极材料，理论容量为530 mAhg -1。在实验上，观察到的原始钛铁矿的比容量与理论值相差甚远。由于这个原因，已经提出了通过碱水热处理来控制形态的方法，作为改善电化学性能的可能策略。同时，FeTiO 3易于与氢氧化钠和氢氧化钾反应，这已经通过钛铁矿对TiO 2萃取的降解研究而得到证实。在本文中，我们证明了碱处理不会引起FeTiO 3粉末的形态改性，但会涉及前体材料的降解并形成不同的相。