The main aim of this project is to provide a precise ab-initio determination of nucleon axial form factors (FFs) using lattice QCD, including both the isovector FF describing quasi-elastic neutrino-nucleon scattering via W-boson exchange, as well as other flavour components of the axial current. This will require simulations of lattice QCD with physical quark masses at fine lattice spacings in large spacetime volumes with full control of excited-state contributions. Accessing the flavour decomposition will also require addressing the contributions from quark-disconnected diagrams.