For the force-field generation, radial and angular cutoffs were both set to 5 Å. We used Gaussian functions with a width of 0.5 Å to broaden the atomic distributions used for both descriptors. The radial and angular descriptors were expanded using eight radial basis functions. The MLFF training involved an initial 100 ps heating run from 300 K to 1000 K, followed by training for 100 ps at 300 K, 100 ps at 600 K, 500 ps at 678 K, and 200 ps at 900 K. The range of temperatures used in training our MLFF include temperatures well-below, well-above, and around the experimentally proposed superionic transition temperature. After the complete training routine, the training dataset included 659 DFT structures. The final MLFF was constructed using 2553 Li and 595 N local reference configurations.