Abstract:
The present invention provides a gel electrolyte cell including a non-aqueous electrolytic solution containing lithium-containing electrolyte salt solved in a non-aqueous solvent and made into a gel state by a matrix polymer, and the gel electrolyte contains vinylene carbonate or derivative thereof in the amount not less than 0.05 wt% and not greater than 5 wt%. This gel electrolyte exhibits an excellent chemical stability with the negative electrode, strength, and liquid-retention characteristic. This gel electrolyte enables to obtain a gel electrolyte cell satisfying the cell capacity, cycle characteristic, load characteristic, and low-temperature characteristic.
Abstract:
A battery capacity calculation methods includes a reference discharge curve calculation step for obtaining a discharge curve as a reference, a correction voltage calculation step for correcting the battery measurement voltage (V1) by a battery resistance component so as to obtain a corrected voltage (V), and a capacity calculation step for calculating the battery discharge capacity from the discharge curve serving as the reference by using the corrected voltage (V). The capacity calculation step has a deterioration index calculation step for calculating a capacity deterioration index (S) as a capacity reduction ratio attributed to battery deterioration. The discharge capacity calculated from the discharge curve as the reference by using the corrected voltage (V) is further multiplied by the capacity deterioration index (S), thereby calculating a discharge capacity.
Abstract:
A nonaqueous electrolyte cell having a unit cell contained in a case member of laminated film and heat-sealed along its periphery. The cell satisfies the inequality (T x R x S)/(W x C) ≤0.96 νg/Wh day where R (g/m2.day) is the water permeability when the thickness of an innermost fusion-bonded resin layer of the case member is T (νm), S (cm2) is the cross sectional area of the resin of a heat-sealed portion, W (cm) is the average width of the heat-sealed portion, C (Wh) is the capacitance of the unit cell. Therefore, the rate of penetration of water is 350 (νg/year) per unit capacitance (Wh).
Abstract:
A non-aqueous electrolytic cell comprising an element cell housed in an armor material consisting of laminated film and sealed by fusing, and electrode terminal leads conducting with respective electrodes constituting the element cell, held in a fusion portion and exposed to the outside of the armor material, wherein an electrode terminal is covered with a sealant resin at a position corresponding to the fusion portion and the sealant resin is deformed in conformity with the shape of an electrode terminal lead to give an irregular form. In order to provide such a coating condition, an elastic body is disposed on a heater head used when the sealant resin is bonded to each lead. The sealant resin has a single-layer structure or a multi-layer structure containing a high-melting-point resin as a core material.
Abstract:
A solid electrolytic secondary battery comprising a positive electrode, a negative electrode and a solid electrolyte interposed between the electrodes, wherein the solid electrolyte contains, as a matrix polymer, a block copolymer of vinylidene fluoride and hexafluoropropylene. The membrane of the block copolymer has a strong mechanical toughness and a high solvent retaining capability and, when used as a matrix polymer of the solid electrolyte, significantly improves an adhesion strength, load characteristics and low-temperature characteristics. A constitutional ratio of hexafluoropropylene in the block copolymer is preferably 3 to 7.5 wt.% with a molecular weight of not smaller than 550,000 and a copolymer having a weight-average molecular weight (Mw) of not smaller than 300,000 and smaller than 550,000 may be jointly used.
Abstract:
A SOLID-ELECTROLYTE SECONDARY BATTERY IS PROVIDED WHICH COMPRISES A POSITIVE ELECTRODE, NEGATIVE ELECTRODE AND A SOLID ELECTROLYTE PROVIDED BETWEEN THE ELECTRODES. THE SOLID ELECTROLYTE CONTAINS AS A MATRIX POLYMER A FLUOROCARBON POLYMER OF 550,000 IN WEIGHT- AVERAGE MOLECULAR WEIGHT (Mw). THE FLUOROCARBON POLYMER HAVING A WEIGHT- AVERAGE MOLECULAR WEIGHT OF MORE THAN 550,000 SHOWS AN EXCELLENT ADHESION TO THE ACTIVE MATERIAL LAYERS OF THE POSITIVE AND NEGATIVE LAYERS. THEREFORE, THE HIGH POLYMER SOLID (OR GEL) ELECTROLYTE ADHERES TO THE ACTIVE MATERIAL LAYERS OF THE ELECTRODES WITH A SUFFICIENT ADHESIVE STRENGTH. A FLUOROCARBON POLYMER HAVING A WEIGHT-AVERAGE MOLECULAR WEIGHT (Mw) OVER 300,000 AND UNDER 550,000 OR MORE IN WEIGHT-AVERAGE MOLECULAR WEIGHT TO LOWER THE VISCOSITY FOR FACILITATING THE FORMATION OF A FILM OF THE ELECTROLYTE.
Abstract:
A solid electrolytic secondary battery comprising a positive electrode, a negative electrode and a solid electrolyte interposed between the electrodes, wherein the solid electrolyte contains, as matrix polymer, fluorine polymer having a weight-average molecular weight (Mw) of 550,000 or larger, which polymer delivering an excellent adhesiveness to the active material layers of the positive and negative electrodes, thereby enabling a polymer sold electrolyte or a gel electrolyte to be bonded to electrode active material layers with a sufficient adhesive strength. In view of a paint viscosity, fluorine polymer having a weight-average molecular weight (Mw) of not smaller than 300,000 and less than 550,000 may be jointly used.
Abstract:
A nonaqueous-electrolyte secondary battery (1) is disclosed which is capable of maintaining satisfactory adhesiveness of leads (3,4) of terminals of electrodes in heat-welded portions of a case (2) of the nonaqueous-electrolyte secondary battery without deterioration of the moistureproofing characteristics. A battery element is accommodated in a case constituted by laminated films such that the battery element is encapsulated by heat welding. Leads of terminals of electrodes electrically conducted with the electrodes which constitute the battery element are exposed to the outside portion of the nonaqueous-electrolyte secondary battery through heat-welded portions. Portions of the leads of the terminals of the electrodes corresponding to the heat-welded portions are coated with an olefine adhesive layer containing a titanate coupling material and a coating layer made of resin which is the same as resin which forms the innermost layer of each of the laminated films.