The effect of incorporating Li additive (Li2CO3) into aerosol deposited BaTiO3 thick films was investigated. The addition of Li2CO3 to the deposited powder facilitated grain growth during post deposition process, even for low annealing temperatures (≤ 700 °C). Therefore, this additive decreased the threshold for ferro/piezoelectricity recovery from 800 °C to 650 °C. Furthermore, annealing at temperatures ≥ 800 °C yielded grain sizes ranging from 100 nm to 700 nm, unprecedented in our previous investigations. Substantially improved ferroelectric and piezoelectric responses were obtained in the 800-900 °C range, with Pr values doubling to 12 µA.cm -2 for films annealed at 900 °C. Moreover, the use of this additive improved leakage behavior, achieving a leakage current density of 0.1 µA.cm -2 and an electrical resistivity of 10 11 Ω.cm at 700 °C. Microscopic analyses revealed a carbon containing secondary phase at grain boundaries, probably corresponding to Li2CO3.