Iron(III) Phosphates Obtained by Thermal Treatment of the Tavorite-Type FePO4路H2O Material: Structures and Electrochemical Properties in Lithium Batteries

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• 作者：Nicolas Marx ; Lydie Bourgeois ; Dany Carlier ; Alain Wattiaux ; Emmanuelle Suard ; Fr茅d茅ric Le Cras ; Laurence Croguennec
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：March 5, 2012
• 年：2012
• 卷：51
• 期：5
• 页码：3146-3155
• 全文大小：655K
• 年卷期：v.51,no.5(March 5, 2012)
• ISSN：1520-510X

文摘

Thermal treatment of the Tavorite-type material FePO₄路H₂O leads to the formation of two crystallized iron phosphates, very similar in structure. Their structural description is proposed taking into account results obtained from complementary characterization tools (thermal analyses, diffraction, and spectroscopy). These structures are similar to that of the pristine material FePO₄路H₂O: iron atoms are distributed between the chains of corner-sharing FeO₆ octahedra observed in FePO₄路H₂O and the octahedra from the tunnels previously empty, in good agreement with the formation of a Fe_4/3PO₄(OH)-type phase. The formation of an extra disordered phase was also proposed. These samples obtained by thermal-treatment of FePO₄路H₂O also intercalate lithium ions through the reduction of Fe³⁺ to Fe²⁺ at an average voltage of 2.6 V (vs Li⁺/Li), with a good cyclability and a reversible capacity around 120 mA h g^鈥? (>160 mA h g^鈥? during the first discharge).