Turning to the performance of DFT, we see that PBE-D3, arguably the most popular GGA functional in battery modelling, has a large MAD of 6.83 kcal/mol. The meta-GGAs M06-L, SCAN and TPSS exhibit MADs between 5.50 and 6.40 kcal/mol. These results raise concerns about the reliability of commonly used functionals for applications related to SEI modelling. Hybrids perform slightly better, with MADs between 4.00 and 5.00 kcal/mol, with the lowest MAD of 4.18 kcal/mol for B3LYP-D3. The meta-hybrid functional M06-2X-D3 performs best, with an MAD of 1.48 kcal/mol, which is comparable to DLPNO-CCSD(T).