For Li3YBr6, the oxidation onset value from the dC/dV curve is at 3 V which is smaller than the calculated thermodynamic decomposition window (3.15 V) and the intrinsic (oxidation and reduction) window (3.43 V). For Li3YCl6, the oxidation onset at 3.5 V is also smaller compared to the calculated thermodynamic decomposition window (4.21 V).