Study of the series Ti_1?yNb_ySnSb with 0?¡Ü?y?¡Ü?1 as anode material for Li-ion batteries

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• 作者：Cyril Marino ; Moulay Tahar Sougrati ; A. Darwiche ; Julien Fullenwarth ; Bernard Fraisse ; Jean Claude Jumas ; Laure Monconduit
• 关键词：Li-ion battery ; Negative electrode ; Conversion material ; High performance
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：15 December, 2013
• 年：2013
• 卷：244
• 期：Complete
• 页码：736-741
• 全文大小：1906 K

文摘

TiSnSb shows an excellent behavior as negative electrode for Li-ion batteries. However the role of Ti is still unclear in the mechanism. To better understand the role played by the transition metal on both the mechanism and the performance of TiSnSb, a progressive substitution of Ti by Nb has been achieved. A full study focuses on the electrochemical mechanisms of the Ti_1?yNb_ySnSb system with 0?¡Ü?y?¡Ü?1 vs Li by combining in situ XRD and M?ssbauer, and EXAFS analyses. The electrochemical mechanism is found to be a reversible conversion mechanism: MSnSb?+?7Li???Li₃Sb?+?1/2 Li₇Sn₂?+?M⁰. The lithium is found to react simultaneously with both Sn and Sb. Nb-rich alloys have been found also to be very promising negative electrode demonstrating the versatility of the MSnSb electrode material family for Li-ion battery application. Using the appropriate electrode formulation, the good cycling life of TiSnSb is not affected by its substitution by Nb.