Cyclic sulfate compound, non-aqueous electrolyte solution containing same, and lithium secondary battery

An additive for a lithium secondary battery, the additive comprising a cyclic sulfate compound represented by the following formula (I) as an active ingredient:

• wherein, in formula (I), R1 represents a group represented by the above formula (II) or a group represented by the above formula (III);
• and R2 represents a hydrogen atom, an alkyl group having from 1 to 6 carbon atoms, a group represented by formula (II), or a group represented by formula (III);
• in formula (II), R3 represents a halogen atom, an alkyl group having from 1 to 6 carbon atoms, a halogenated alkyl group having from 1 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms, or a group represented by the above formula (IV);
• and the wavy line in formula (II), formula (III) and formula (IV) represents the position of bonding;
• and
• in a case in which there are two groups represented by formula (II) in the cyclic sulfate compound represented by formula (I), the two groups represented by formula (II) may be the same as or different from each other.

A cyclic sulfate compound represented by the following formula (I):

• wherein, in formula (I), R1 represents a group represented by the above formula (II) or a group represented by the above formula (III);
• and R2 represents a hydrogen atom, an alkyl group having from 1 to 6 carbon atoms, a group represented by formula (II), or a group represented by formula (III);
• in formula (II), R3 represents a halogen atom, an alkyl group having from 1 to 6 carbon atoms, a halogenated alkyl group having from 1 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms, or a group represented by the above formula (IV);
• and the wavy line in formula (II), formula (III) and formula (IV) represents the position of bonding;
• and
• in a case in which there are two groups represented by formula (II) in the cyclic sulfate compound represented by formula (I), the two groups represented by formula (II) may be the same as or different from each other.