Schiff Base as Additive for Preventing Gas Evolution in Li₄Ti₅O₁₂-Based Lithium-Ion Battery

Lithium titanium oxide (Li₄Ti₅O₁₂)-based electrodes are very promising for long-life cycle batteries. However, the surface reactivity of Li₄Ti₅O₁₂ in organic electrolytes leading to gas evolution is still a problem that may cause expansion of pouch cells. In this study, we report the use of Schiff base (1,8-diazabicyclo[5.4.0]undec-7-ene) as an additive that prevents gas evolution during cell aging by a new mechanism involving the solid electrolyte interface on the anode surface. The in situ ring opening polymerization of cyclic carbonates occurs during the first cycles to decrease gas evolution by 9.7 vol % without increasing the internal resistance of the battery.