| 摘要 |
PURPOSE:To make it possible to suppress the increase of internal DC resistance and the decrease of capacity to smaller levels even if used at a high temperature of 85 deg.C for a long time, by adding an organic compound containing phosphorus as an additive to the composition of an electrolytic solution consisting of an organic solvent and an organic electrolyte. CONSTITUTION:An electrolytic solution is constituted by adding an organic compound containing phosphorus as an additive to a solution that an electrolyte made up of quaternary ammonium salt is dissolved in an organic solvent such as propylene carbonate, etc. One of compounds usable for additives is made up of salt expressed by an equation R4P.X, where R expresses an alkyl or allyl radical of carbon number 1-15, or an aryl radical of carbon number 6-15, and X expresses BF4, PF6, ClO4, AsF6, CF3SO3. These additives cause electrochemical polymerization reaction by applied voltage, and electrochemically inactive high polymer films are formed on collectors or interfaces of metallic cases touching the electrolytic solution. And, this makes it possible to obtain electric double layer capacitors which assure a life of 2,000 hours for 85 deg.C loads. |
