Abstract: A nonaqueous electrolyte includes a lithium salt and a nonaqueous solvent in which the lithium salt is dissolved. The nonaqueous solvent includes a fluorinated chain carboxylate ester and a dicarbonyl compound having two carbonyl groups in the molecule. The dicarbonyl compound is at least one selected from the group consisting of esters and acid anhydrides and has not more than three atoms between the two carbonyl groups.

Abstract: A non-aqueous electrolyte secondary cell provided with: a positive electrode that has a positive electrode active material; a negative electrode; and a non-aqueous electrolyte. The positive electrode active material contains a lithium composite oxide containing Ni, and the non-aqueous electrolyte contains a non-aqueous solvent containing a fluorinated chain carboxylic acid ester and an organochlorine compound. The organochlorine compound is represented by general formula CF3CH2CO—CClR1R2 (where in the formula, R1 and R2 are respectively independent, and are selected from a hydrogen, a halogen, a C1-2 alkyl group, or a C1-2 halogenated alkyl group).

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The negative electrode includes an opposing region that opposes the positive electrode with the separator disposed therebetween and a non-opposing region that does not oppose the positive electrode but opposes the separator. In the case that the discharge cut-off voltage of the nonaqueous electrolyte secondary battery is in the range of 2.5 V to 3.0 V, a part of the non-opposing region adjacent to a boundary between the opposing region and the non-opposing region has an electric potential plateau in the range of ?0.02 V to +0.02 V relative to a negative electrode potential in the opposing region.

Abstract: A nonaqueous electrolyte secondary battery including an electrode assembly in which a positive electrode and a negative electrode are stacked together through a separator, a nonaqueous electrolytic solution, and an exterior case which accommodates the electrode assembly and the nonaqueous electrolytic solution. The negative electrode is electrically connected to the exterior case, which contains iron, and the nonaqueous electrolytic solution includes a fluorinated carboxylate ester and lithium fluorosulfate salt (LiSO3F).

Abstract: A nonaqueous electrolyte includes a lithium salt, a trifluoropropionate ester of the formula (1), and a fluorinated carboxylate ester of the formula (2). The amount of (1) is not less than 10 mass % of the nonaqueous electrolyte. In the formulae, R1 is a C1-3 alkyl group, one or two of X1 to X4 are fluorine atoms, R2 is a hydrogen atom, a C1-3 alkyl group or a fluorinated C1-3 alkyl group, and R3 is a C1-3 alkyl group or a fluorinated C1-3 alkyl group.

Abstract: A nonaqueous electrolyte secondary battery including an electrode assembly in which a positive electrode and a negative electrode are stacked together through a separator, a nonaqueous electrolytic solution, and an exterior case which accommodates the electrode assembly and the nonaqueous electrolytic solution. The negative electrode is electrically connected to the exterior case, which contains iron, and the nonaqueous electrolytic solution includes a fluorinated carboxylate ester and lithium fluorosulfate salt (LiSO3F).

Abstract: A nonaqueous electrolyte includes a lithium salt and a nonaqueous solvent in which the lithium salt is dissolved. The nonaqueous solvent includes a fluorinated chain carboxylate ester and a dicarbonyl compound having two carbonyl groups in the molecule. The dicarbonyl compound is at least one selected from the group consisting of esters and acid anhydrides and has not more than three atoms between the two carbonyl groups.

Abstract: A nonaqueous electrolyte secondary battery according to one embodiment of the present disclosure comprises a positive electrode having a positive electrode active substance layer, a negative electrode having a negative electrode active substance layer, and a nonaqueous electrolyte. The nonaqueous electrolyte contains a sulfonylimide salt and a nonaqueous solvent containing a fluorinated chain carboxylic acid ester represented by a general formula. The fluorinated chain carboxylic acid ester content of the nonaqueous solvent is 80 vol % or greater and the sulfonylimide salt content is 2.4 mol or greater with respect to 1 L of the nonaqueous solvent. (In the formula, R1 and R2 are any one of H, F, and CH3-xFx (where x is 1, 2 or 3), and can be the same or different. R3 is a C1-C3 alkyl group and can contain F.

Abstract: A non-aqueous electrolyte secondary cell provided with: a positive electrode that has a positive electrode active material; a negative electrode; and a non-aqueous electrolyte. The positive electrode active material contains a lithium composite oxide containing Ni, and the non-aqueous electrolyte contains a non-aqueous solvent containing a fluorinated chain carboxylic acid ester and an organochlorine compound. The organochlorine compound is represented by general formula CF3CH2CO-CClR1R2 (where in the formula. R1 and R2 are respectively independent, and are selected from a hydrogen, a halogen, a C1-2 alkyl group, or a C1-2 halogenated alkyl group).

Abstract: A nonaqueous electrolyte secondary battery including a positive electrode containing a positive electrode mixture, a negative electrode, and a nonaqueous electrolyte containing a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent. The positive electrode mixture contains a positive electrode active material and a phosphate salt, the positive electrode active material contains a lithium-nickel composite oxide represented by formula (1): LixNi1-yM1yO2 (in the formula, 0.9?x?1.1, 0?y?0.7, and M1 is at least one element selected from the group consisting of Co, Mn, Fe, Ti, Al, Mg, Ca, Sr, Zn, Y, Yb, Nb, Cr, V, Zr, Mo, W, Cu, In, Sn, and As), and the nonaqueous solvent contains a trifluoropropionate ester represented by formula (2): F3C—CH2—CO—O—R1 (in the formula, R1 is a C1-3 alkyl group).

Abstract: The present invention relates to a non-aqueous electrolyte secondary battery (30) which includes: a positive electrode (1); a negative electrode (2); a non-aqueous electrolyte containing a non-aqueous solvent; an outer package (5, 7, 19) receiving the positive electrode (1), the negative electrode (2), and the non-aqueous electrolyte; and a current interrupt valve (14) which interrupts a current in response to an increase in pressure inside the outer package (5, 7, 19). The positive electrode (1) contains a carbonate compound, the non-aqueous solvent contains a fluorinated cyclic carbonate and a fluorinated chain ester, and the total content of the fluorinated cyclic carbonate and the fluorinated chain ester is with respect to the total volume of the non-aqueous solvent, 50 percent by volume or more.

Abstract: A nonaqueous electrolyte secondary battery including an electrode assembly in which a positive electrode and a negative electrode are stacked together through a separator, a nonaqueous electrolytic solution, and an exterior case which accommodates the electrode assembly and the nonaqueous electrolytic solution. The negative electrode is electrically connected to the exterior case, which contains iron, and the nonaqueous electrolytic solution includes a fluorinated carboxylate ester and lithium fluorosulfate salt (LiSO3F).

Abstract: A nonaqueous electrolyte includes a lithium salt, a trifluoropropionate ester of the formula (1), and a fluorinated carboxylate ester of the formula (2). The amount of (1) is not less than 10 mass % of the nonaqueous electrolyte. In the formulae, R1 is a C1-3 alkyl group, one or two of X1 to X4 are fluorine atoms, R2 is a hydrogen atom, a C1-3 alkyl group or a fluorinated C1-3 alkyl group, and R3 is a C1-3 alkyl group or a fluorinated C1-3 alkyl group.

Abstract: A nonaqueous electrolytic solution for nonaqueous electrolyte secondary batteries includes a nonaqueous solvent and an electrolyte. The nonaqueous solvent includes a fluorinated carboxylate ester represented by the formula (1): where R1 and R2 are each any of H, F, CH3-xFx (x is 1, 2 or 3) and R3 is an optionally fluorinated alkyl group having 1 to 3 carbon atoms. The nonaqueous electrolytic solution further comprising lithium fluorosulfate salt (LiSO3F).

Abstract: In a nonaqueous electrolyte secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a nonaqueous electrolyte containing a lithium salt in a nonaqueous solvent, and a separator disposed between the positive electrode and the negative electrode, an inorganic particle layer is disposed between the positive electrode and the separator, and the nonaqueous solvent contains a chain fluorinated carboxylate ester represented by the formula CH3-XFX—CH2—COO—CH3 (where, x is an integer of 1 to 3) in an amount of 15% by volume or more based on the total amount of the nonaqueous solvent.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The negative electrode includes an opposing region that opposes the positive electrode with the separator disposed therebetween and a non-opposing region that does not oppose the positive electrode but opposes the separator. In the case that the discharge cut-off voltage of the nonaqueous electrolyte secondary battery is in the range of 2.5 V to 3.0 V, a part of the non-opposing region adjacent to a boundary between the opposing region and the non-opposing region has an electric potential plateau in the range of ?0.02 V to +0.02 V relative to a negative electrode potential in the opposing region.

Abstract: Nonaqueous electrolyte secondary batteries are provided which are resistant to a decrease in capacity associated with charge and discharge cycles and have excellent discharge rate characteristics. A nonaqueous electrolyte secondary battery according to an example embodiment includes a positive electrode including a lithium transition metal oxide, a negative electrode and a nonaqueous electrolyte. The lithium transition metal oxide has a content of voids within particles of 0.2 to 30% before first charging. The nonaqueous electrolyte includes a fluorinated cyclic carbonate and a fluorinated chain carboxylate ester.

Abstract: The present invention relates to a non-aqueous electrolyte secondary battery (30) which includes: a positive electrode (1); a negative electrode (2); a non-aqueous electrolyte containing a non-aqueous solvent; an outer package (5, 7, 19) receiving the positive electrode (1), the negative electrode (2), and the non-aqueous electrolyte; and a current interrupt valve (14) which interrupts a current in response to an increase in pressure inside the outer package (5, 7, 19). The positive electrode (1) contains a carbonate compound, the non-aqueous solvent contains a fluorinated cyclic carbonate and a fluorinated chain ester, and the total content of the fluorinated cyclic carbonate and the fluorinated chain ester is with respect to the total volume of the non-aqueous solvent, 50 percent by volume or more.

Abstract: A non-aqueous electrolyte secondary battery having high input/output characteristics and preferable cycle characteristics is provided. A non-aqueous electrolyte according to one example of an embodiment includes a positive electrode which includes a positive electrode active material containing as a primary component, a lithium transition metal oxide having a layered structure, the content of Co of which is with respect to the total mass of metal elements except Li is 1 to 20 percent by mole; a negative electrode which includes a negative electrode active material containing Si; and a non-aqueous electrolyte which includes a fluorinated chain carboxylic acid ester.

Abstract: A non-aqueous electrolyte secondary cell includes: a positive electrode including a positive electrode active material which contains as a primary component, a lithium composite oxide in which the rate of nickel to the total number of moles of metal elements other than lithium is 50 percent by mole or more; a negative electrode; and a non-aqueous electrolyte. The non-aqueous electrolyte contains lithium bis(fluorosulfonyl)amide and a fluorinated chain carboxylic acid ester represented by the following formula, R1 and R2 each represent H, F, or CH3-xFx (x represents 1, 2, or 3) and may be equivalent to or different from each other. R3 represents an alkyl group having 1 to 3 carbon atoms and may contain F.