Nonaqueous electrolyte for secondary battery and lithium secondary battery

摘要

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).;

主权项

1. A non-aqueous electrolyte liquid for a secondary battery, comprising:
a metal salt including 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): wherein, in formula (1) and formula (2), R1 represents a substituent which includes an alkyl group having 1 to 5 carbon atoms and is bonded to an adjacent oxygen atom; R2 represents an alkyl group having 1 to 5 carbon atoms, or an OR1 group; R1s and R2s may be the same or different from each other, and at least one R1 or R2 represents a structure represented by the following formula (4) or formula (5) ; and R1 and R2 may be linked to each other and form a ring; wherein, in formula (4) and formula (5), R4s each independently represent a hydrogen atom, or a substituent having the same definition as R2 in formula (1); R3 represents an alkyl group having 1 to 5 carbon atoms; m3 represents an integer of from 1 to 5; * represents the position of bonding to the moiety —Si—O— of the silicon compound; and in a case where the substituent represented by formula (4) or formula (5) is carried by R2, * represents the position of bonding to the moiety —Si— of the silicon compound.