An electrochemical device includes a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, and an electrolytic solution. The positive electrode active material contains a conductive polymer, and the conductive polymer is configured to be doped and dedoped with anions. The electrolytic solution contains (a) a first salt of a lithium ion and a first anion and (b) a second salt of a lithium ion and a second anion. The first anion is a bis(sulfonyl)imide anion containing fluorine.

An electrolyte solution containing at least one selected from a compound (I) represented by the following formula (I) and specific compounds (II). The formula (I) is as follows: ##STR00001##
wherein R.sup.11 is a C2-C6 alkyl group. Also disclosed are a secondary battery containing the electrolyte solution and a module including the electrochemical device or the secondary battery.

The present invention provides an energy device having excellent properties. Also provided is a nonaqueous electrolyte solution containing a compound represented by the following Formula (1), wherein R.sup.11, R.sup.12 and R.sup.13 each independently represent an organic group having 1 to 3 carbon atoms; and R.sup.11 and R.sup.12, R.sup.11 and R.sup.13, or R.sup.12 and R.sup.13 are optionally bound with each other to form a 5-membered ring or a 6-membered ring, with a proviso that a total number of carbon atoms of R.sup.11, R.sup.12 and R.sup.13 is 7 or less. ##STR00001##

The present invention provides an energy device having excellent properties. Also provided is a nonaqueous electrolyte solution containing a compound represented by the following Formula (1), wherein R.sup.11, R.sup.12 and R.sup.13 each independently represent an organic group having 1 to 3 carbon atoms; and R.sup.11 and R.sup.12, R.sup.11 and R.sup.13, or R.sup.12 and R.sup.13 are optionally bound with each other to form a 5-membered ring or a 6-membered ring, with a proviso that a total number of carbon atoms of R.sup.11, R.sup.12 and R.sup.13 is 7 or less. ##STR00001##

An electrolyte solution containing a compound represented by the following formula (1): ##STR00001##
wherein R.sup.101 and R.sup.102 are the same as or different from each other and are each a hydrogen atom, a fluorine atom, or an alkyl group optionally containing a fluorine atom; and R.sup.103 is an alkyl group or an organic group containing an unsaturated carbon-carbon bond. Also disclosed is an electrochemical device and lithium ion secondary battery including the electrolyte solution, and a module including the electrochemical device or lithium ion secondary battery.

An electrolyte solution containing a compound represented by the following formula (1): ##STR00001##
wherein R.sup.101 and R.sup.102 are the same as or different from each other and are each a hydrogen atom, a fluorine atom, or an alkyl group optionally containing a fluorine atom; and R.sup.103 is an alkyl group or an organic group containing an unsaturated carbon-carbon bond. Also disclosed is an electrochemical device and lithium ion secondary battery including the electrolyte solution, and a module including the electrochemical device or lithium ion secondary battery.

Electrolytes and electrolyte additives for energy storage devices comprising linear carbonate compounds.

Electrolytes and electrolyte additives for energy storage devices comprising linear carbonate compounds.

Electrolytes and electrolyte additives for energy storage devices comprising thiophene compounds are disclosed. The energy storage device comprises a first electrode and a second electrode, wherein at least one of the first electrode and the second electrode is a Si-based electrode, a separator between the first electrode and the second electrode, an electrolyte, and at least one electrolyte additive selected from a thiophene compound. In some embodiments, the thiophene compound is a terthiophene or a thiophene oligomer.

Electrolytes and electrolyte additives for energy storage devices comprising thiophene compounds are disclosed. The energy storage device comprises a first electrode and a second electrode, wherein at least one of the first electrode and the second electrode is a Si-based electrode, a separator between the first electrode and the second electrode, an electrolyte, and at least one electrolyte additive selected from a thiophene compound. In some embodiments, the thiophene compound is a terthiophene or a thiophene oligomer.