Abstract: Conventional batteries are disadvantageous in that a firm outer case must be used to maintain an electrical connection between electrodes, which has been an obstacle to size reduction. Those in which each electrode and a separator are joined with an adhesive resin suffer from conflict between adhesive strength and battery characteristics, particularly ion conductivity and internal resistivity. To solve these problems, it is an object of the invention to reduce resistance between electrodes, i.e., internal resistance of a battery to improve battery characteristics while securing both insulation function against electron conduction and ion conductivity between electrodes and also to maintain adhesive strength enough to firmly join the electrodes thereby to provide a light, compact and thin battery.

Abstract: An adhesive for batteries a solution of which has improved wetting properties, which affords improved adhesive strength and prevents deterioration of battery performance, and which can provide secondary batteries having an arbitrary shape, such as a thin shape, with high reliability and high charge and discharge efficiency, and a battery using the same are disclosed. An adhesive comprising a thermoplastic resin, a solvent capable of dissolving the thermoplastic resin, and a neutral and aprotic surface active agent is used as an adhesive for batteries for adhering an active material layer joined to a current collector to a separator, whereby a secondary battery which can take an arbitrary shape, such as a thin shape, with high reliability and high charge and discharge efficiency can be obtained.

Abstract: An object is to provide with good productivity a practical lithium ion secondary battery which secures lightness in weight and safety without using a firm battery case and has reduced internal resistivity. The lithium ion secondary battery comprises a tabular roll type laminated electrode body in which a band-formed positive electrode (3) comprising a positive electrode active material layer (7) and a positive electrode current collector (6) alternates with a band-formed negative electrode (5) comprising a negative electrode active material layer (9) and a negative electrode current collector (10), having therebetween a band-formed rolled separator (4) which holds a lithium ion-containing electrolytic solution, the positive electrode (3) or the negative electrode (5) being adhered with two separators (4) by an adhesive layer (11).

Abstract: The invention is a high-performance lithium ion secondary battery which needs no firm case so that it is possible to reduce the size and weight and to design the shape freely and yet which secures high structural strength and safety. The method of the invention for forming a lithium ion battery comprises the step of joining a positive electrode (3) having a positive electrode active material layer (32) joined to a positive electrode current collector (31) and a negative electrode (5) having a negative electrode active material layer (52) joined to a negative electrode current collector (51) with an adhesive resin (6) comprising at least partially a plastic resin being present in parts therebetween and the step of deforming the adhesive resin (6). The method achieves simplification and improvement of productivity in forming a lithium ion battery.

Abstract: To obtain a lithium ion secondary battery having excellent charge and discharge characteristics in which electric connection between electrodes can be maintained without requiring a strong armor metal case, so that it can be made into thin forms having large energy density.

Abstract: An electrode in which an active material 11 or 7, an electron conducting material 12 or a current collector 5 or 6 has PTC characteristics is used as at least one of positive and negative electrodes 1 and 2.

Abstract: A uniform mixture of a powdered active material 1, conductive fiber 2, and a binder resin is applied to a polytetrafluoroethylene plate, etc. to a prescribed thickness and dried to form a sheet electrode 8. A pair of electrodes 8 are adhered to a separator 9 to make an electrode laminate 10. A battery is formed of the electrode laminate 10 or a plurality of the electrode laminates 10.

Abstract: A conventional battery has a problem that when a temperature of the battery reaches at least 100° C. due to internal short-circuit or the like, large short-circuit current is generated, and therefore, a temperature of the battery further increases due to exothermic reaction to increase the short-circuit current. Also, if an aluminum laminated pack and the like are used as a casing material for the purpose of lightweight and improved energy density of the battery, and if an adhesive agent is used to joint an electrode with a separator to maintain the contact thereof, there is a problem that the adhesive agent intrudes into the opening part of the separator and the opening part area and the hole diameter decrease to bring about unfavorable results for discharge load characteristics of the battery.

Abstract: A method of fabricating a lithium ion secondary battery, wherein a positive electrode 3 is prepared by bonding a positive electrode active material layer 7 to a positive electrode collector 6, a negative electrode 5 is prepared by bonding a negative electrode active material layer 9 to a negative electrode collector 10 and a separator 4 which is arranged between these two electrodes and closely adhered thereto by bonding, using a fluoride containing adhesive resin mixed with N-methylpyrrolidone solvent and in which the N-methylpyrrolidone solvent is evaporated to produce through holes, which communicate the positive electrode active material layer 7 and the negative electrode active material layer 9 with the separator 4.

Abstract: An electrode in which an active material 11 or 7, an electron conducting material 12 or a current collector 5 or 6 has PTC characteristics is used as at least one of positive and negative electrodes 1 and 2.

Abstract: It is an object of the invention to provide a process for producing a lithium ion battery comprising adhering a positive and a negative electrode to an ion conducting layer (separator) with an adhesive resin thereby to obtain sufficient joint strength between the electrodes and the separator while securing ion conductivity among the positive and negative electrodes and the separator. The steps of heating an adhesive liquid (4) which is a mixture of a solvent and a resin and in which the resin is not completely dissolved at or below room temperature and applying the heated adhesive liquid to the adhesive surface of the separator (3) or of the electrode (1 or 2), superposing the separator and the electrodes with their adhesive surfaces facing each other, and drying the applied adhesive liquid are carried out in order. The solubility of the resin is increased when the adhesive liquid is to be applied to make uniform application feasible.

Abstract: The battery of the present invention comprises the electrode which contains the pre-determined amount of electronically conductive material at which resistance increases in accordance with temperature rise and conductive agent; the electrode wherein the ratio of the total amount of the electronically conductive material and the conductive agent to the active material is set to a pre-determined value; and the electrode wherein the average particle size of the conductive agent based on the average particle size of the electronically conductive material is in a pre-determined range.

Abstract: The present invention relates to an electrolytic solution excellent in stability, and also relates to a battery excellent in battery performance and having an outer structure having light weight. The electrolytic solution contains a supporting electrolyte and a gas formation inhibitor in the solvent. The gas formation inhibitor contains a decomposition product of the supporting electrolyte with formation of a gas in the solvent. It functions as controlling to solution equilibrium in the electrolytic solution participating in decomposition reaction of the supporting electrolyte. A battery is obtained by filling the electrolytic solution between a positive electrode and a negative electrode.

Abstract: An object is to provide a lithium ion secondary battery which maintains the electrical connections between each active material layer and a separator without using a firm housing, can have an increased energy density, can take an arbitrary shape, such as a thin shape, exhibits excellent charge and discharge characteristics, and has a large battery capacity. Positive and negative electrode active material particles are bonded to their respective current collectors to form a positive electrode and a negative electrode. The positive and the negative electrode active material layers are joined to a separator with a binder resin so that the joint strength between the separator and the positive and the negative electrode active material layers may be equal to or greater than the joint strength between the positive and the negative electrode active material layers and the respective current collectors to prepare a tabular laminated battery body having a plurality of electrode laminates.

Abstract: In case of a conventional battery having a laminated sheet material as a battery case (1) for storing a battery body, the metal foil on the laminated sheet does not contact to either a positive electrode or a negative electrode and electric potential is unstable. Therefore, there was a problem that it was impossible to obtain electrical shielding effect.

Abstract: A paste-like active material mixture prepared by mixing an active material powder and a particulate material comprising a polymer soluble in a nonaqueous electrolytic solution is applied to, e.g. collectors 1c and 2c to a uniform thickness, and then dried to form positive and negative electrodes 1, 2 containing an active material powder and a particulate polymer. The two electrodes are assembled into an electrode laminate into which the foregoing electrolytic solution is then injected.

Abstract: An object is to provide with good productivity a practical lithium ion secondary battery which secures lightness in weight and safety without using a firm battery case and has reduced internal resistivity. The lithium ion secondary battery comprises a tabular roll type laminated electrode body in which a band-formed positive electrode (3) comprising a positive electrode active material layer (7) and a positive electrode current collector (6) alternates with a band-formed negative electrode (5) comprising a negative electrode active material layer (9) and a negative electrode current collector (10), having therebetween a band-formed rolled separator (4) which holds a lithium ion-containing electrolytic solution, the positive electrode (3) or the negative electrode (5) being adhered with two separators (4) by an adhesive layer (11).

Abstract: To provide an adhesive for obtaining reliability over a broad temperature range. In a lithium ion secondary battery having a positive electrode 1, a negative electrode 4, and a separator 7 holding an electrolytic solution, an adhesive 8 containing an organic vinyl compound having at least two vinyl groups per molecule is applied between the positive electrode 1 and the separator 7 and between the negative electrode 4 and the separator 7 and cured by reaction to join them.

Abstract: In a conventional battery containing metal lithium in the negative electrode, there is a problem that large short-circuit current was generated with temperature rise due to internal short-circuit or the like, and therefore, the temperature of the battery further increases due to exothermic reaction to increase the short-circuit current.

Abstract: As to the batteries containing an organic low molecular compound in the space between the positive and negative electrodes, there has been a risk of unusual conditions such as ignition because the organic low molecular compound in liquid was released from the above space to the outside, when there was heating of the battery and the like.