The nitroamino group as a powerful explophore is widely employed in the design of energetic compounds. However, its strong electron-withdrawing effect often introduces acidic sites in the molecules, resulting in hygroscopicity. In this study, we successfully synthesized a high-density energetic ammonium salt (2a) by employing large 2,2'-dinitroamino-4,4',5,5'-tetranitro-2