  Silicon anodes hold great promise for next-generation Li-ion batteries. The
main obstacle to exploiting their high performance is the challenge of linking
experimental observations to atomic structures due to the amorphous nature of
Li-Si alloys. We unveil the atomistic-scale structures of amorphous Li-Si using
our recently developed density functional tight-binding model. Our claim is
supported by the successful reproduction of experimental X-ray pair
distribution functions, NMR and M\"ossbauer spectra using simple nearest
neighbors models. The predicted structures are publicly available.
