Abstract: This embodiment includes an electrode assembly; a case for housing the electrode assembly; and an external terminal made of a metal and disposed on the case, in which the external terminal includes: a flange extending along an outer surface of the case; and a shaft extending from the flange to pass through the case and be conductive with the electrode assembly, the flange is made of a clad material having a plurality of metal layers layered in a passing direction of the shaft, each adjacent ones of the plurality of metal layers are made of different metals in kind, and one of the plurality of metal layers of the flange at one end in the passing direction is made of the same metal in kind as the metal of the shaft, and is welded to the shaft.

Abstract: The present invention provides a nonaqueous electrolyte secondary battery configured such that a positive electrode, a negative electrode, and a nonaqueous electrolyte are accommodated in a battery case. The battery includes lithium bis(oxalato)borate (LiBOB) at least at the time of assembly of the battery. The negative electrode includes a film derived from the LiBOB and containing a boron atom (B) and a carbonate ion (CO32?). A ratio (mc/mb) of a molar content mc of the carbonate ion to a molar content mb of the boron atom is 4.89 or less. In a preferred aspect, when a molar content A of the LiBOB is A (mmol) and a remaining space volume in the battery case is V (cm3) at the time of the assembly, a ratio A/V is 0.053 or less.

Abstract: A lithium ion battery has a flat wound electrode assembly, a nonaqueous electrolyte, and a battery case. The nonaqueous electrolyte contains an electrically insulating inorganic aggregate and is formed of an impregnating electrolyte impregnated into the flat wound electrode assembly and a surplus electrolyte not impregnated into the flat wound electrode assembly. Letting the flat wound electrode assembly be divided into a planar region where the electrode surfaces are planar surfaces and a lower wound curved region which is positioned vertically downward from the planar region and where the electrode surfaces are curved, a boundary plane that includes the boundary between the planar region and the lower wound curved region, the inorganic aggregate amount MO included in a space which is below the boundary plane and the inorganic aggregate amount MI included in the impregnating electrolyte within the flat wound electrode assembly satisfy the relationship MO>MI.

Abstract: A lithium ion battery has a flat wound electrode assembly, a nonaqueous electrolyte, and a battery case. The nonaqueous electrolyte contains an electrically insulating inorganic aggregate and is formed of an impregnating electrolyte impregnated into the flat wound electrode assembly and a surplus electrolyte not impregnated into the flat wound electrode assembly. Letting the flat wound electrode assembly be divided into a planar region where the electrode surfaces are planar surfaces and a lower wound curved region which is positioned vertically downward from the planar region and where the electrode surfaces are curved, a boundary plane that includes the boundary between the planar region and the lower wound curved region, the inorganic aggregate amount MO included in a space which is below the boundary plane and the inorganic aggregate amount MI included in the impregnating electrolyte within the flat wound electrode assembly satisfy the relationship MO>MI.

Abstract: The present invention provides a negative electrode active material which can prevent reduction in battery capacity by suppressing reaction of an electrolyte solution at the surface of the negative electrode active material as well as can reduce resistance resulting from the formation of a film. A negative electrode active material 90 for a lithium ion secondary battery comprises a carbon material 92 capable of reversibly storing and releasing lithium, an amorphous carbon membrane 94 coating the surface of the carbon material and a film 96 containing a phosphate compound and coating the surface of the amorphous carbon membrane.

Abstract: This invention provides a method for producing a non-aqueous electrolyte secondary battery. The method comprises constructing a battery cell that comprises a positive electrode comprising a positive electrode active material, a negative electrode comprising a negative electrode active material, and a non-aqueous electrolyte solution comprising a non-aqueous solvent and an oxalatoborate-based compound. The method further comprises charging the battery cell to form on the negative electrode a layer that is derived from the oxalatoborate-based compound and comprises boron and oxalate ions. The method further comprises carrying out a modification treatment to increase the ratio of number of moles mB of boron to number of moles mA of oxalate ions in the layer.

Abstract: A non-aqueous electrolyte secondary battery according to the present invention includes a positive electrode, a negative electrode, and a non-aqueous electrolyte solution. The negative electrode includes a coating derived from lithium bis(oxalate)borate. The coating derived from lithium bis(oxalate)borate includes a coating containing boron element and a coating containing oxalate ion. A ratio of the boron element contained in the coating derived from lithium bis(oxalate)borate to the oxalate ion is equal to or more than 5. Accordingly, it is possible to provide a non-aqueous electrolyte secondary battery capable of reliably obtaining the effect due to the formation of a coating.

Abstract: The present invention provides a nonaqueous electrolyte secondary battery configured such that a positive electrode, a negative electrode, and a nonaqueous electrolyte are accommodated in a battery case. The battery includes lithium bis(oxalato)borate (LiBOB) at least at the time of assembly of the battery. The negative electrode includes a film derived from the LiBOB and containing a boron atom (B) and a carbonate ion (CO32?). A ratio (mc/mb) of a molar content mc of the carbonate ion to a molar content mb of the boron atom is 4.89 or less. In a preferred aspect, when a molar content A of the LiBOB is A (mmol) and a remaining space volume in the battery case is V (cm3) at the time of the assembly, a ratio A/V is 0.053 or less.

Abstract: A lithium secondary battery 100 is configured such that an electrode body 20, in which a cathode and an anode are stacked via a separator impregnated with an electrolyte, is housed in a battery case 10 having a substantially cylindrical square shape and that an opening 12 of the case 10 is blocked by a lid 14. Further, the lid 14 is provided with a cathode terminal 38 and an anode terminal 48, and such terminals are respectively connected, inside the battery case 10, to an internal cathode collection terminal 37 and an internal anode collection terminal 47. A non-aqueous electrolyte used for the lithium secondary battery 100 contains, as a specific compound, for example, LiBOB, and an initial content of such specific compound relative to a capacitance of the anode is 0.04 to 0.5 [(mol/kg)/(mF/cm2)].

Abstract: A nonaqueous electrolyte secondary cell 10 provided by the present invention includes a nonaqueous electrolyte solution, and an electrode unit 50 that includes a positive electrode 64 and a negative electrode 84. The negative electrode 84 includes a negative electrode current collector 82 and a negative electrode mixture layer 86 that contains at least a negative electrode active material and is formed on a surface of the negative electrode current collector 82. A coating film containing at least boron (B) and sodium (Na) is formed on a surface of the negative electrode active material in the negative electrode mixture layer 86, and the ratio A/B is less than 0.1 where A is the amount [?g/cm2] of sodium (Na) and B is the amount [?g/cm2] of boron (B) that are contained in the coating film per unit area of the negative electrode mixture layer 86.

Abstract: The manufacturing method of the invention includes the steps of: providing a positive electrode and a negative electrode (S10), a sodium ingredient being included in either the positive electrode or the negative electrode; producing an electrode assembly from the provided positive electrode and negative electrode (S20); producing a battery assembly in which the electrode assembly is housed in a battery case (S30); injecting a nonaqueous electrolyte solution into the battery case (S40), the nonaqueous electrolyte solution including at least lithium bis(oxalato)borate, a fluorophosphate compound, a carbonate solvent and an ether solvent, and the amount of ether solvent included in the nonaqueous electrolyte solution being less than 10 vol % when the amount of nonaqueous solvent included in the nonaqueous electrolyte solution is set to 100 vol %; and charging and discharging the battery assembly (S50).

Abstract: This invention provides a method for producing a non-aqueous electrolyte secondary battery. The method comprises constructing a battery cell that comprises a positive electrode comprising a positive electrode active material, a negative electrode comprising a negative electrode active material, and a non-aqueous electrolyte solution comprising a non-aqueous solvent and an oxalatoborate-based compound. The method further comprises charging the battery cell to form on the negative electrode a layer that is derived from the oxalatoborate-based compound and comprises boron and oxalate ions. The method further comprises carrying out a modification treatment to increase the ratio of number of moles mB of boron to number of moles mA of oxalate ions in the layer.

Abstract: The manufacturing method of the invention includes the steps of: providing a positive electrode and a negative electrode (S10), a sodium ingredient being included in either the positive electrode or the negative electrode; producing an electrode assembly from the provided positive electrode and negative electrode (S20); producing a battery assembly in which the electrode assembly is housed in a battery case (S30); injecting a nonaqueous electrolyte solution into the battery case (S40), the nonaqueous electrolyte solution including at least lithium bis(oxalato)borate, a fluorophosphate compound, a carbonate solvent and an ether solvent, and the amount of ether solvent included in the nonaqueous electrolyte solution being less than 10 vol % when the amount of nonaqueous solvent included in the nonaqueous electrolyte solution is set to 100 vol %; and charging and discharging the battery assembly (S50).

Abstract: A non-aqueous electrolyte secondary battery according to the present invention includes a positive electrode, a negative electrode, and a non-aqueous electrolyte solution. The negative electrode includes a coating derived from lithium bis(oxalate)borate. The coating derived from lithium bis(oxalate)borate includes a coating containing boron element and a coating containing oxalate ion. A ratio of the boron element contained in the coating derived from lithium bis(oxalate)borate to the oxalate ion is equal to or more than 5. Accordingly, it is possible to provide a non-aqueous electrolyte secondary battery capable of reliably obtaining the effect due to the formation of a coating.

Abstract: The present invention provides a lithium ion secondary battery capable of improving charge/discharge cycle characteristics or durability such as high-temperature storability, while suppressing deterioration in initial performance, and a manufacturing method thereof. The lithium ion secondary battery according to the present invention includes an electrode serving as a cathode or an anode including an electrode layer containing an active material. At least a part of a surface of the active material is coated with lithium halide (X) having a low ionic bonding property and a peak strength ratio P1/P2 of less than 2.0 between a peak strength P1 in the vicinity of 60 eV and a peak strength P2 in the vicinity of 70 eV in a Li-XAFS measurement.

Abstract: A lithium secondary battery 100 is configured such that an electrode body 20, in which a cathode and an anode are stacked via a separator impregnated with an electrolyte, is housed in a battery case 10 having a substantially cylindrical square shape and that an opening 12 of the case 10 is blocked by a lid 14. Further, the lid 14 is provided with a cathode terminal 38 and an anode terminal 48, and such terminals are respectively connected, inside the battery case 10, to an internal cathode collection terminal 37 and an internal anode collection terminal 47. A non-aqueous electrolyte used for the lithium secondary battery 100 contains, as a specific compound, for example, LiBOB, and an initial content of such specific compound relative to a capacitance of the anode is 0.04 to 0.5 [(mol/kg)/(mF/cm2)].

Abstract: A non-aqueous electrolyte secondary battery according to the present invention includes a positive electrode, a negative electrode, and a non-aqueous electrolyte solution. The negative electrode includes a coating derived from lithium bis(oxalate)borate. Assuming that an intensity of a peak attributable to a three-coordinate structure of the coating measured by an XAFS method is represented by a and an intensity of a peak attributable to a four-coordinate structure of the coating measured by the XAFS method is represented by ?, the coating formed on the surface of the negative electrode satisfies a condition of ?/(?+?)?0.4. Accordingly, it is possible to provide a non-aqueous electrolyte secondary battery capable of reliably obtaining the effect due to the formation of a coating.

Abstract: A nonaqueous electrolytic solution secondary battery includes: a positive electrode; a negative electrode provided with a negative electrode active material layer containing at least a negative electrode active material; a nonaqueous electrolytic solution; and a coat containing phosphorus (P) atoms formed on a surface of the negative electrode active material, in which a ratio of an amount of phosphorus atoms per unit area of the negative electrode active material layer Mp with respect to a capacitance per unit area of the negative electrode active material layer Cdl (Mp/Cdl ratio) is 0.79 ?mol/mF?Mp/Cdl?1.21 ?mol/mF.

Abstract: The present invention provides a negative electrode active material which can prevent reduction in battery capacity by suppressing reaction of an electrolyte solution at the surface of the negative electrode active material as well as can reduce resistance resulting from the formation of a film. A negative electrode active material 90 for a lithium ion secondary battery comprises a carbon material 92 capable of reversibly storing and releasing lithium, an amorphous carbon membrane 94 coating the surface of the carbon material and a film 96 containing a phosphate compound and coating the surface of the amorphous carbon membrane.