Provided is a non-aqueous electrolyte for lithium ion battery, comprising a compound A represented by structural formula I and a compound B represented by structural formula II:

##STR00001##

Wherein, in formula I, R.sub.1 is selected from alkylene having 1-5 carbon atoms or fluorine substituted alkylene having 1-5 carbon atoms; R.sub.2 is selected from anyone of alkylene having 1-5 carbon atoms, fluorine substituted alkylene having 1-5 carbon atoms or carbonyl; In formula II, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are each independently selected from hydrogen, fluorine atom or a group containing 1-5 carbon atoms. The compound A and compound B of the non-aqueous electrolyte can form a passivation film formed by reduction, decomposition and combination reactions on the surface of negative electrode material of lithium-ion battery, thereby improving thermal stability of the passivation film and high-temperature cycle and storage performance of the battery.

An electrolyte containing functionalized crown ethers suitable for use in electrochemical energy storage devices useful for reducing battery resistance, increasing cycle life, and improving high-temperature performance is disclosed.

An electrolyte containing functionalized crown ethers suitable for use in electrochemical energy storage devices useful for reducing battery resistance, increasing cycle life, and improving high-temperature performance is disclosed.

The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I).

##STR00001##

In the formula, each of R.sup.1 and R.sup.2 independently represents a hydrogen atom, a C(O)OR.sup.4 group, or the like, and R.sup.1 and R.sup.2 may be bonded to each other to form a ring structure. R.sup.3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3. When n is 1, then L and R.sup.4 represent an alkyl group having 1 to 6 carbon atoms or the like; and when n is 2 or 3, then L represents an n-valent connecting group, X represents a C(O) group, an S(O) group, an S(O).sub.2 group, an S(O).sub.2R.sup.5S(O).sub.2 group or a CR.sup.6R.sup.7 group, R.sup.5 represents an alkylene group having 1 to 4 carbon atoms, and each of R.sup.6 and R.sup.7 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I).

##STR00001##

In the formula, each of R.sup.1 and R.sup.2 independently represents a hydrogen atom, a C(O)OR.sup.4 group, or the like, and R.sup.1 and R.sup.2 may be bonded to each other to form a ring structure. R.sup.3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3. When n is 1, then L and R.sup.4 represent an alkyl group having 1 to 6 carbon atoms or the like; and when n is 2 or 3, then L represents an n-valent connecting group, X represents a C(O) group, an S(O) group, an S(O).sub.2 group, an S(O).sub.2R.sup.5S(O).sub.2 group or a CR.sup.6R.sup.7 group, R.sup.5 represents an alkylene group having 1 to 4 carbon atoms, and each of R.sup.6 and R.sup.7 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

The present invention relates to a non-aqueous electrolyte solution characterized by containing at least one type of cyclic sulfonic acid ester compound represented by general formula (1). According to the present invention, a non-aqueous electrolyte solution capable of improving battery characteristics can be provided. ##STR00001##
(In the formula, R.sup.1 to R.sup.4 are each independently a hydrogen atom, a fluorine atom, an alkyl group having 1-6 carbon atoms or an alkoxy group having 1-6 carbon atoms, and Z is a substituted or unsubstituted alkylene group having 1-6 carbon atoms, a substituted or unsubstituted fluoroalkylene group having 1-6 carbon atoms, or a divalent organic group having 2-6 carbon atoms in which alkylene unit(s) or fluoroalkylene unit(s) are bonded via one or more ether bonds.)

The present invention relates to a non-aqueous electrolyte solution characterized by containing at least one type of cyclic sulfonic acid ester compound represented by general formula (1). According to the present invention, a non-aqueous electrolyte solution capable of improving battery characteristics can be provided. ##STR00001##
(In the formula, R.sup.1 to R.sup.4 are each independently a hydrogen atom, a fluorine atom, an alkyl group having 1-6 carbon atoms or an alkoxy group having 1-6 carbon atoms, and Z is a substituted or unsubstituted alkylene group having 1-6 carbon atoms, a substituted or unsubstituted fluoroalkylene group having 1-6 carbon atoms, or a divalent organic group having 2-6 carbon atoms in which alkylene unit(s) or fluoroalkylene unit(s) are bonded via one or more ether bonds.)

Monomers and polymers are provided that comprise a carbon alicyclic group or heteroalicyclic group that comprises 1) one or more acid-labile ring substituents and 2) one or more ether or thioether ring substituents. Photoresists that comprise such polymers also are provided.

Provided is a novel production method capable of easily producing a methylene disulfonate compound. The method for producing a methylene disulfonate compound comprises reacting a specific sulfonic acid compound with a formaldehyde compound in the presence of sulfur trioxide.

Provided is a novel production method capable of easily producing a methylene disulfonate compound. The method for producing a methylene disulfonate compound comprises reacting a specific sulfonic acid compound with a formaldehyde compound in the presence of sulfur trioxide.