A subject for the invention is to improve the cycle characteristics of a high-capacity secondary battery containing an active material packed at a high density, by using a particulate active material having a low aspect ratio. The invention relates to a nonaqueous-electrolyte secondary battery comprising a negative electrode and a positive electrode each capable of occluding/releasing lithium, a separator, and a nonaqueous electrolyte solution comprising a nonaqueous solvent and a lithium salt, characterized in that the separator comprises a porous film made of a thermoplastic resin containing an inorganic filler, and at least either of the following is satisfied: the active material contained in the negative electrode is a particulate active material having an aspect ratio of from 1.02 to 3; and the active material contained in the positive electrode is a particulate active material having an aspect ratio of from 1.02 to 2.2.

Nonaqueous electrolyte secondary battery

Provided are an electrolyte for a high-voltage lithium secondary battery and a high-voltage lithium secondary battery containing the same, and more particularly, an electrolyte for a high-voltage lithium secondary battery which may not be oxidized and decomposed at the time of being kept at a high voltage and a high temperature to prevent swelling of a battery through suppression of gas generation, thereby having excellent high-temperature storage characteristics and excellent discharge characteristics at a low temperature while decreasing a thickness increase rate of the battery, and a high-voltage lithium secondary battery containing the same.

Electrolyte for lithium secondary battery and lithium secondary battery comprising same

The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics at high temperatures and further capable of not only improving a capacity retention rate after a high-temperature cycle test but also decreasing a rate of increase of an electrode thickness, and also to provide an energy storage device using the same. A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of a diisocyanate compound represented by OCN-L-NCO (in the formula, L represents an alkylene group having from 4 to 12 carbon atoms) and further containing from 0.001 to 5% by mass of at least one selected from a specified phosphoric acid ester compound, a specified cyclic sulfonic acid ester compound, a specified isocyanate compound having an ester structure, and a specified triple bond-containing compound, and an energy storage device using the same, are disclosed.

Non-aqueous electrolyte solution and electricity-storage device using same

The demand for improvements in lithium non-aqueous electrolyte secondary batteries has been constantly increasing in recent years, but the durability—most prominently the cycle characteristics—have resided in a trade off relationship with properties such as the capacity, resistance, and output characteristics. A problem has thus been a poor overall property balance. In order to solve this problem, the present invention uses a non-aqueous electrolyte solution including, in addition to an electrolyte and a non-aqueous solvent, (A) at least one compound selected from the group consisting of carbonates having a carbon-carbon unsaturated bond, compounds represented by the following general formula (1), sulfoxides, sulfites, sulfones, sulfonates, sultones, and sulfates; (B) a fluorine atom-containing cyclic carbonate; and (C) a compound that has at least two isocyanate groups in the molecule.

Non-aqueous electrolyte solution and non-aqueous electrolyte secondary battery employing the same

A compound having a group represented by formula (Ia): wherein R 1 and R 2 each independently represent a C 1 to C 8 fluorinated alkyl group, ring W represents a C 5 to C 18 alicyclic hydrocarbon group that may have a substituent, and * represents a binding site.

Compound, resin, resist composition and method for producing resist pattern

The present invention is to provide a nonaqueous electrolytic solution prepared by dissolving an electrolyte salt in a nonaqueous solvent, wherein the nonaqueous solvent includes 0.01 to 40% by volume of an ester having two alkyl groups at the α-position carbon of the carbonyl group and being represented by the following general formula (I), and an energy storage device. (in the above formula, R 1 is an alkyl group, an alkenyl group or an alkynyl group in which at least one of the hydrogen atoms may be substituted with a halogen atom, R 2 and R 3 are an alkyl group in which at least one of the hydrogen atoms may be substituted with a halogen atom, and R 2 and R 3 may be linked to each other to form a ring. However, when R 2 and R 3 do not form a ring, R 3 is an alkyl group in which at least one of the hydrogen atoms may be substituted with a halogen atom.).

Nonaqueous electrolytic solution and energy storage device using same

An object of the present invention is to provide a nonaqueous electrolytic solution capable of improving low-temperature load characteristics after high temperature charging storage, an electrochemical element using it, and a 1,2-dioxypropane compound used for it. The nonaqueous electrolytic solution of the present invention comprises an electrolyte salt dissolved in a nonaqueous solvent, and contains a 1,2-dioxypropane compound represented by the above-mentioned general formula (I).
 
(wherein R 1 and R 2 each represent a hydrogen atom, or an alkyl group having from 1 to 6 carbon atoms; X 1 represents a group selected from -S(=O)-, -S(=O) 2 -, - C(=O)-, -CR 3 R 4 -, -P(=O)(OR 5 )- and -SiR 6 R 7 -; R 3 and R 4 each represent a hydrogen atom, or an alkyl group having from 1 to 6 carbon atoms; R 5 to R 7 each represent an alkyl group having from 1 to 6 carbon atoms. Y 1 represents an alkylsulfinyl group, an alkenylsulfinyl group, an alkynylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an alkenylsulfonyl group, an alkynylsulfonyl group, or an arylsulfonyl group; Z 1 represents a hydrogen atom, an alkyl group, an alkylsulfinylmethyl group, an alkenylsulfinylmethyl group, an alkynylsulfinylmethyl group, an arylsulfinylmethyl group, an alkylsulfonylmethyl group, an alkenylsulfonylmethyl group, an alkynylsulfonylmethyl group, or an arylsulfonylmethyl group; 
provided that at least one hydrogen atom on the carbon atom of X 1 , Y 1 and Z 1 may be substituted with a halogen atom).

Nonaqueous electrolyte solution, electrochemical element using same, and 1,2-dioxypropane compound used in same

The present invention includes [1] a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of a specified acyclic lithium salt in the nonaqueous electrolytic solution and being capable of improving electrochemical characteristics in a broad temperature range; and [2] an energy storage device including a positive electrode, a negative electrode, and a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of a specified acyclic lithium salt in the nonaqueous electrolytic solution.

Non-aqueous electrolyte and power storage device using same

Provided are a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous solvent including a cyclic carbonate and a linear carbonate under the following condition 1 or 2, and the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of vinylsulfonyl fluoride, and an energy storage device using the same. Condition 1: The linear carbonate includes both a symmetric linear carbonate and an asymmetric linear carbonate, and the proportion of the asymmetric linear carbonate occupying in the linear carbonate is from 51 to 95% by volume. Condition 2: The cyclic carbonate includes ethylene carbonate and propylene carbonate, and the linear carbonate includes a symmetric linear carbonate. The nonaqueous electrolytic solution of the present invention is capable of improving electrochemical characteristics in the case of using an energy storage device at a high voltage and further capable of not only improving a discharge capacity retention rate after a high-voltage cycle but also inhibiting gas generation.

Nonaqueous electrolyte solution and electrical storage device employing same

The present invention provides a nonaqueous electrolytic solution capable of suppressing worsening of heat stability of a negative electrode and improving safety of an energy storage device while maintaining high-load charging and discharging cycle properties at a high temperature, an energy storage device using the same, and a phosphonoformic acid compound to be used for the same. The nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent contains 0.001 to 5% by mass of at least one selected from a phosphonoformic acid compound having at least one carbon-carbon unsaturated bond, which is represented by the following general formula (I), and a phosphonoformic acid compound having a carbon-carbon unsaturated bond or two phosphonocarbonyl groups, which is represented by the following general formula (II). In the formula (I), each of R 1 to R 3 is an aliphatic organic group, provided that at least one of R 1 to R 3 represents a carbon-carbon unsaturated bond-containing aliphatic organic group. In the formula (II), each of R 4 and R 5 represents an alkyl group, a cycloalkyl group, or an aryl group, and R 4 and R 5 may be bonded to each other to form a ring structure. m represents 1 or 2; when m is 1, then R 6 represents an aryl group; when m is 2, then R 6 represents an alkylene group, an alkenylene group, or an alkynylene group; and a part of hydrogen atoms of R 4 to R 6 may be substituted with a halogen atom.

Nonaqueous electrolyte solution, electricity storage device using same, and phosphonoformic acid compound used in same

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