From the cosmological Li problem to the Galactic Li evolution

Abstract: Li is the very element that presents deep insights yet many problems to astrophysics. In this proceeding manuscript I first introduce a stellar solution to the cosmological Li problem, which reveals that Li was first destroyed and re-accumulated by these stars shortly after they were born, then discuss Li in the interstellar medium in the form of the molecule LiH, and the different Li enrichment histories seen in the Galactic thick and thin discs with data from the Gaia-ESO survey.