A quantitative and qualitative study of gas generation observed in LiFePO$_4$-TiNb$_2$O$_7$ cells
Résumé
Since 20 years, titanium oxide materials, and in particular lithium titanate spinel Li$_4$Ti$_5$O$_{12}$ (LTO),
were considered as promising negative electrode materials for lithium-ion cells. In the case of the
TiNb$_2$O$_7$ compound (TNO), which has a larger theoretical lithiation capacity of 388 mAh g$^{-1}$, few studies have focused on the outgassing of the material. In this work, we quantified the volume produced as a function of different cycling parameters and then characterized the produced species and show a prevalence of H$_2$ gas. The use of carbon coating as a mitigation strategy and its limitation is also discussed.