| abstract |
Disclosed are a non-aqueous electrolyte and a non-aqueous electrolyte secondary battery in which generation of gas and deposition of metallic lithium on a negative electrode are suppressed, and cycle deterioration and abnormal heat generation of the battery under a high temperature environment can be suppressed. A non-aqueous electrolyte includes a non-aqueous solvent and a solute that is dissolved in the non-aqueous solvent and includes LiPF 6. The non-aqueous solvent includes ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC). ) And additives, in a non-aqueous solvent, the EC content is 5 to 35% by mass, the PC content is 1 to 60% by mass, the DEC content is 10 to 60% by mass, and the additive content Is 0.001 to 15% by mass, and the additive contains at least VC and contains LiBF 4 and / or fluoroethylene carbonate (FEC). In the additive, the content of VC m VC and LiBF 4 The content m BF and the FEC content m FEC satisfy 0.0005 ≦ (m BF + m FEC ) / m VC ≦ 30. [Selection figure] None |