摘要:
A non-aqueous electrolyte secondary battery including: a positive electrode having a positive electrode material mixture containing a composite lithium oxide; a negative electrode; a polyolefin separator; a non-aqueous electrolyte; and a heat-resistant insulating layer interposed between the positive and negative electrodes. The positive electrode material mixture has an estimated heat generation rate at 200° C of not greater than 50 W/kg. The positive electrode and the negative electrode are wound together with the separator and the heat-resistant insulating layer interposed therebetween.
摘要:
A non-aqueous electrolyte secondary battery including: a positive electrode having a positive electrode material mixture containing a composite lithium oxide; a negative electrode; a polyolefin separator; a non-aqueous electrolyte; and a heat-resistant insulating layer interposed between the positive and negative electrodes. The positive electrode active material mixture has an estimated heat generation rate at 200° C. of not greater than 50 W/kg. The estimated heat generation rate is determined by obtaining a relation between absolute temperature T and heat generation rate V of the positive electrode material mixture using an accelerating rate calorimeter; plotting a relation between the inverse of absolute temperature T and the logarithm of heat generation rate V according to the Arrhenius law; obtaining a straight line fitted to the plotted points in a heat generation temperature range of T
摘要:
There is provided a solid electrolytic capacitor including an anode body formed of a valve-action metal with a dielectric oxide coating layer formed on its surface, a cathode body, and an electroconductive polymer layer disposed between the anode body and the cathode body. The electroconductive polymer layer contains a softener for softening the electroconductive polymer layer, so that a solid electrolytic capacitor is provided that has small variations in characteristics, a lower equivalent series resistance (ESR), and an excellent high frequency property. In addition, when the anode and cathode of a solid electrolytic capacitor including an electroconductive polymer as a solid electrolyte are joined to each other, a lower ESR can be obtained under a lower pressure, and the electroconductive polymer layer can be prevented from being peeled off.
摘要:
An electric double layer capacitor of the present invention having a capacitor element and an electrolyte arranged in a case sealed with a sealer, and further includes in the case a solid buffer for suppressing fluctuation in pH of the electrolyte. The solid buffer includes a compound selected from an oxide and a hydroxide. An element contained in the compound is at least one selected from the group consisting of Be, Al, Si, Sc, V, Cr, Fe, Ni, Cu, Zn, Ga, Ge, Y, Zr, Mo, Ag, Cd, In, Te, La, Ce, Pr, Nd, Pm, Gd, Dy, Ho, Er, Tm, Lu, W and Pb.
摘要:
In an electrolytic capacitor of the present invention, a dielectric layer is provided on a surface of a valve metal element for an anode having a capacitor forming part and an electrode lead part, and further, a solid electrolyte layer and a charge collecting layer for a cathode are provided in this order thereon. The capacitor forming part and the electrode lead part of the valve metal element for an anode have rough surface layers on their surfaces, and are compressed in the thickness direction of the rough surface layers. Further, a region other than the electrode lead part and the charge collecting element for cathode is molded with a molding material. Exposed portions of the electrode lead part and the charge collecting element for cathode function as electrode terminals, respectively.
摘要:
An aluminum electrolytic capacitor includes a case, a sealant for sealing the case, a separator, a cathode, an anode, and an electrolyte sealed in the case, and an anode lead connected to the anode, wherein the cathode includes an aluminum foil, and a solid compound having a function of keeping the pH of the electrolyte constant further is provided in the case.
摘要:
The invention provides a method for evaluating the safety of a battery under an internal short-circuit condition. The battery includes: an electrode group including a positive electrode, a negative electrode, and an insulating layer for electrically insulating the electrodes, which are wound or laminated; an electrolyte; a housing for housing the electrode group and the electrolyte; and a current-collecting terminal for electrically connecting the electrode group and the housing. The method of the invention includes: placing a foreign object at a location inside the electrode group of the battery where the positive electrode and the negative electrode face each other; and pressing the location by the pressure applied by a pressing tool to locally crush the insulating layer between the positive and negative electrodes, thereby causing an internal short-circuit. The contact area of the electrode group and the pressing tool during the pressing is larger than the area of a rectangle circumscribed about the foreign object. A short-circuit test is conducted at a given location inside the battery to comprehensively evaluate the safety of the battery under an internal short-circuit condition.
摘要:
A housing for containing electrode assemblies and an electrolyte includes a cover 18 having a pair of long-side ends 18e. Peripheral thinned portions 11 are formed by cutting the inner face of a top plate 18a near the long-side ends 18e in parallel with the long-side ends 18e. A central thinned portion 15 is formed by cutting the central part of the outer face of the top plate 18a in parallel with the long-side ends 18e. This facilitates the rupture of a housing 1 due to an increase of the inner pressure, while ensuring the strength of the housing 1 to withstand external pressure.
摘要:
To operate a safety mechanism normally even when an accident happens. For this object, an electrochemical element includes an exhaust valve that operates when an internal pressure in a casing 4 reaches a predetermined pressure to release gas occurring in the casing to the outside, and a perforated plate 2 having holes 5a and 5b, which is provided between an electrode group 3 and the exhaust valve. The area of the perforated plate 2 excluding the holes 5a and 5b is 20% or more and 50% or less of the area of the opening of the casing. The perforated plate 2 is adapted for electrically insulating the electrode group 3 from the sealing member 1.
摘要:
An electrochemical device of the present invention comprises a positive electrode, a negative electrode and an electrolyte, wherein at least one of the positive electrode and the negative electrode includes a compound having a structure represented by the general formula (1): It is thereby possible to obtain a lightweight and high energy-density electrochemical device having an excellent cycle characteristic.