Decomposition of LiNO3
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  Upon thermal decomposition, $\ce{LiNO3}$ gives lithium oxide ($\ce{Li2O}$),
  nitrogen dioxide, and oxygen:
  
  $$\ce{4 LiNO3 → 2 Li2O + 4 NO2 + O2}$$
  
  Other group I nitrates decompose differently, forming the nitrite salt and oxygen. Because of its relatively small size, the lithium
  cation is very polarizing, which favors the formation of the oxide.