Electrochemical device

An electrochemical device, comprising:

• a case;
• a nonagueous electrolyte filled in the case and containing a room temperature molten salt in an amount of not smaller than 1% to not larger than 50% by volume, the room temperature molten salt containing a cation represented by formula (1) or formula (2) given below;
• a first electrode housed in the case;
• and
• a second electrode housed in the case and containing a substance having a lamellar crystal structure,
• where R1 denotes a substituent including a carbonic acid ester group;
• and each of R2 and R3 denotes a substituent having an acyclic structure and having 4 or less carbon atoms, or R2 and R3 are combined to denote a substituent having a cyclic structure and having not less than 4 to not more than 5 carbon atoms;
• where R4 denotes a substituent including a carbonic acid ester group, R5 denotes a substituent having an acyclic structure and having 4 or less carbon atoms, and R6 denotes a hydrogen atom or a methyl group;
• wherein R2 denotes a substituent selected from the group consisting of a methyl group, an ethyl group, a propyl group, an isopropyl group, a (2-methoxy) propyl group, a butyl group, an isobutyl group, a sec-butyl group and a tert-butyl group, and R3 denotes a substituent selected from the group consisting of a methyl group and an ethyl group;
• or
• R2 and R3 are combined to denote a substituent selected from the group consisting of a pyrrolidyl group and a piperidyl group;
• and
• R1 denotes a substituent represented by formula (4) given below:
• where m is 0 or 1, and R8 denotes a hydrogen atom.

An electrochemical device, comprising:

• a case;
• a nonaqueous electrolyte filled in the case and containing a room temperature molten salt in an amount of not smaller than 1% to not larger than 50% by volume, the room temperature molten salt containing a cation represented by formula (1) or formula (2) given below;
• a first electrode housed in the case;
• and
• a second electrode housed in the case and containing a substance having a lamellar crystal structure;
• where R1 denotes a substituent including a carbonic acid ester group;
• and each of R2 and R3 denotes a substituent having an acyclic structure and having 4 or less carbon atoms, or R2 and R3 are combined to denote a substituent having a cyclic structure and having not less than 4 to not more than 5 carbon atoms;
• where R4 denotes a substituent including a carbonic acid ester group, R5 denotes a substituent having an acyclic structure and having 4 or less carbon atoms, and R6 denotes a hydrogen atom or a methyl group;
• wherein R5 denotes a methyl group, and R4 denotes a substituent represented by formula (4) given below:
• where m is 0 or 1, and R8 denotes a hydrogen atom.

An electrochemical device, comprising:

• a case;
• a nonaqueous electrolyte filled in the case and containing a room temperature molten salt in an amount of not smaller than 1% to not larger than 50% by volume, the room temperature molten salt containing a cation represented by formula (1) or formula (2) given below;
• a first electrode housed in the case;
• and
• a second electrode housed in the case and containing a substance having a lamellar crystal structure,
• where R1 denotes a substituent including a carbonic acid ester group;
• and each of R2 and R3 denotes a substituent having an acyclic structure and having 4 or less carbon atoms, or R2 and R3 are combined to denote a substituent having a cyclic structure and having not less than 4 to not more than 5 carbon atoms;
• where R4 denotes a substituent including a carbonic acid ester group, R5 denotes a substituent having an acyclic structure and having 4 or less carbon atoms, and R6 denotes a hydrogen atom or a methyl group;
• wherein R5 denotes a methyl group, and R4 denotes a substituent represented by formula (3) given below:
• where l is 1 or 2, and R7 denotes a methyl group or an ethyl group.