Nonaqueous Electrolyte Solution and Nonaqueous Secondary Battery

Abstract

A nonaqueous electrolyte solution is provided comprising a nonaqueous solvent containing acetonitrile at 5 vol % to 95 vol %; a lithium salt; and one or more compounds having a structure satisfying the following conditions 1 to 5: 1. being a condensation polycyclic heterocyclic ring compound, 2. containing a pyrimidine backbone in the condensation polycyclic heterocyclic ring, 3. containing 3 or more nitrogen atoms in the condensation polycyclic heterocyclic ring, 4. containing 5 or more sp2 carbons in the condensation polycyclic heterocyclic ring, and 5. having no hydrogen atoms bonded to the nitrogen atoms in the condensation polycyclic heterocyclic ring.

Dependencies are inferred from the claim text.