The thermal diffusivity and the specific heat capacity of the double-sided electrodes are used to calculate the overall thermal conductivity for the positive and negative electrode respectively. As the electrode is a layered material the conductivity of the electrode lamina can be deconvoluted. The conductivity in the in-plane direction is the harmonic average of the conductivities (weighted by their thickness). In this case, there were three layers, two layers of the electrode laminate and one layer of the current collector. Therefore, the thermal conductivity perpendicular to the electrode can be written as: 4