Electrolytic solution

An electrolytic solution containing

• a heteroelement-containing organic solvent at a mole ratio of not greater than 1.5 relative to a metal salt,
• the heteroelement-containing organic solvent containing a linear carbonate represented by general formula (1) below,
• the metal salt being a metal salt whose cation is an alkali metal, an alkaline earth metal, or aluminum and whose anion has a chemical structure represented by general formula (2) below:
• R10OCOOR11 general formula (1)
• (R10 and R11 are each independently selected from CnHaFbClcBrdIe that is a linear alkyl, or CmHfFgClhBriIj that includes a cyclic alkyl in a chemical structure thereof. “n” is an integer not smaller than 1, “m” is an integer not smaller than 3, and “a”, “b”, “c”, “d”, “e”, “f”, “g”, “h”, “i”, and “j” are each independently an integer not smaller than 0 and satisfy 2n+1=a+b+c+d+e and 2m=f+g+h+i+j.)
• (R21X21)(R22SO2)N general formula (2)
• (R21 is selected from:
• hydrogen;
• a halogen;
• an alkyl group optionally substituted with a substituent group;
• a cycloalkyl group optionally substituted with a substituent group;
• an unsaturated alkyl group optionally substituted with a substituent group;
• an unsaturated cycloalkyl group optionally substituted with a substituent group;
• an aromatic group optionally substituted with a substituent group;
• a heterocyclic group optionally substituted with a substituent group;
• an alkoxy group optionally substituted with a substituent group;
• an unsaturated alkoxy group optionally substituted with a substituent group;
• a thioalkoxy group optionally substituted with a substituent group;
• an unsaturated thioalkoxy group optionally substituted with a substituent group;
• CN;
• SCN;
• or OCN.
• R22 is selected from:
• hydrogen;
• a halogen;
• an alkyl group optionally substituted with a substituent group;
• a cycloalkyl group optionally substituted with a substituent group;
• an unsaturated alkyl group optionally substituted with a substituent group;
• an unsaturated cycloalkyl group optionally substituted with a substituent group;
• an aromatic group optionally substituted with a substituent group;
• a heterocyclic group optionally substituted with a substituent group;
• an alkoxy group optionally substituted with a substituent group;
• an unsaturated alkoxy group optionally substituted with a substituent group;
• a thioalkoxy group optionally substituted with a substituent group;
• an unsaturated thioalkoxy group optionally substituted with a substituent group;
• CN;
• SCN;
• or OCN.
• R21 and R22 optionally bind with each other to form a ring.
• X21 is selected from SO2, C═O, C═S, RaP═O, RbP═S, S═O, or Si═O.
• Ra and Rb are each independently selected from:
• hydrogen;
• a halogen;
• an alkyl group optionally substituted with a substituent group;
• a cycloalkyl group optionally substituted with a substituent group;
• an unsaturated alkyl group optionally substituted with a substituent group;
• an unsaturated cycloalkyl group optionally substituted with a substituent group;
• an aromatic group optionally substituted with a substituent group;
• a heterocyclic group optionally substituted with a substituent group;
• an alkoxy group optionally substituted with a substituent group;
• an unsaturated alkoxy group optionally substituted with a substituent group;
• a thioalkoxy group optionally substituted with a substituent group;
• an unsaturated thioalkoxy group optionally substituted with a substituent group;
• OH;
• SH;
• CN;
• SCN;
• or OCN.
• Ra and Rb each optionally bind with R21 or R22 to form a ring.)