# Decomposition of LiNO3

I have a doubt about decomposition of alkali metals. Why does $\ce{LiNO3}$ decompose to give $\ce{Li2O}$ and $\ce{NO2}$ where as other alkali metals decompose to give corresponding nitrite and oxygen?

Upon thermal decomposition, $\ce{LiNO3}$ gives lithium oxide ($\ce{Li2O}$), nitrogen dioxide, and oxygen:
$$\ce{4 LiNO3 → 2 Li2O + 4 NO2 + O2}$$