The chemical history of the Milky Way is encapsulated by its stars, where FGK-type stars act as fossils due to their long lifetime and convective surface which, to first approximation, retains the abundances they were born with (Jofré, Heiter & Soubiran 2019). Lithium is the heaviest element formed in Big Bang nucleosynthesis (BBN); therefore, stellar Li abundances (A(Li) 1) can be used to determine the amount of Li initially produced in BBN (Cyburt et al. 2016).
