arXiv:2611.09832v1 Announce Type: new Abstract: In this work, we propose a mass-lumped finite element method for the Allen-Cahn equation that incorporates nonlinear mobility which may degenerate. The spatial approximation uses continuous, piecewise linear, mass-lumped finite elements, while convex splitting is employed for the double-well potential in time. Under the standard non-obtuse mesh condition, it is shown that the resulting fully discrete method preserves the maximum-bound principle unconditionally: if the initial approximation takes values in $[-1, 1]$, then so does the numerical solution at every time level. Additionally, the method dissipates the original discrete Ginzburg-Landau energy without any time-step restriction, even when the mobility vanishes at pure phases. This analysis relies on the monotonicity of the lumped finite element operator and the convexity of the split potential. Numerical experiments confirm these theoretical properties and demonstrate the robustness of the method in phase-separation dynamics involving degenerate mobility.