US Patent 9293787 Nonaqueous electrolyte for secondary battery and lithium secondary battery

Provided are a non-aqueous electrolyte liquid for a secondary battery, which has excellent lithium ion conductibility and voltage resistance and is suitably used in a lithium secondary battery, and a high output power lithium secondary battery containing this non-aqueous electrolyte liquid for a secondary battery. Disclosed is a non-aqueous electrolyte liquid for a secondary battery containing a metal salt containing an ion of a metal which belongs to Group 1 or Group 2 of the Periodic Table of Elements, and at least one selected from the group consisting of silicon compounds represented by the following formula (1) or formula (2).