Study of the series Ti1−yNbySnSb with 0 ≤ y ≤ 1 as anode material for Li-ion batteries

C. Marino (1) , Moulay Tahar Sougrati (1, 2) , Ali Darwiche (1) , Julien Fullenwarth (1) , Bernard Fraisse (1) , Jean-Claude Jumas (1) , Laure Monconduit (1)

1 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
2 RS2E - Réseau sur le stockage électrochimique de l'énergie

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 Ti1−yNbySnSb system with 0 ≤ y ≤ 1 vs Li by combining in situ XRD and Mössbauer, 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.

Mots clés: Li-ion battery; Negative electrode; Conversion material; High performance

Domaines: Matériaux

C. Marino, Moulay Tahar Sougrati, Ali Darwiche, Julien Fullenwarth, Bernard Fraisse, et al.. Study of the series Ti1−yNbySnSb with 0 ≤ y ≤ 1 as anode material for Li-ion batteries. Journal of Power Sources, 2013, 244, pp.736-741. ⟨10.1016/j.jpowsour.2012.11.061⟩. ⟨hal-00815527⟩