We studied the vibrational and electrical properties as well as phonon-magnon scattering contribution to the thermal conductance of Niobium di-selenide using the first principles calculation method. The DFT plus spin-orbit coupling was used to comprehend the lattice spin effect on the thermal conductivity in two-dimensional materials in general. At room temperature, in-plane thermal conductivity is 100.2Wm-1K-1 and out-of-plane thermal conductivity is 6.21Wm-1K-1 as found in our result. From self-energy analysis, we found that phonon-magnon scattering
rate at high frequency is maximum two order of magnitude higher than at low frequency because of the Noether’s law of energy conservation and higher density of state at high frequency region. Higher temperatures make this phenomenon even more pronounced. Additionally, we measured the system’s carrier density and mobility at various temperatures. At room temperature, we found the carrier mobility is around 1000cm2V -1s-1.