Production method for electric double-layer capacitor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiroyuki Maeshima, Kiyohiro Ishii, Hiroki Moriwake
Life of this patent
Estimating the term…
Abstract
A method of manufacturing electric double layer capacitors is disclosed. The method assumes a model in which solute is dissolved in solvent before preparing electrolyte, and estimates a withstanding voltage through a simulation. The electrolyte, of which withstanding voltage is expected to exceed a target value, is selectively prepared. The method adjusts respective surface areas of the positive electrode and the negative electrode of the capacitor for making full use of the withstanding voltage of the electrolyte. According to this method, a time for developing electrolyte can be substantially shortened, and an electric double layer capacitor having a high withstanding voltage can be efficiently developed.
Claims12
A method of manufacturing an electric double layer capacitor having electrolyte, a positive electrode and a negative electrode, the method comprising:
- a first process for selecting the electrolyte through a simulation;
- and
- a second process for setting respective surface areas of the positive electrode and the negative electrode,
- wherein the first process includes the steps of:
- a first step for selecting cation, anion and solvent forming the electrolyte;
- a second step for finding a first value by calculating an energy which represents a total energy of the association complex formed of the cation and the anion while the association complex is in a stable state;
- a third step for finding a second value by calculating the total energy of a radical species derived from one-electron reduction of the association complex, and a third value by calculating the total energies of radical species derived from one-electron reduction of the association complex;
- a fourth step for finding a fourth value by subtracting the second value from the first value, and finding a fifth value by subtracting the first value from the third value;
- a fifth step for finding a sixth value by subtracting the fourth value from the fifth value;
- and
- a sixth step for determining whether or not the sixth value exceeds a given target value,
- wherein the second process sets the respective surface areas of the positive electrode and the negative electrode based on the sixth value of the electrolyte selected.
A method of manufacturing an electric double layer capacitor including a positive electrode and a negative electrode formed of activated carbon, and electrolyte, the method comprising the steps of:
- in a model in which a solute is dissolved in solvent, assuming that a plurality of different association complexes are formed of cation and anion both being elements of the solute, cation which does not form the association complex is formed, and anion which does not form the association complex is formed;
- finding a plurality of first values by calculating respective energies which represents total energies of the association complexes, the cations or the anions individually while they are in a stable state;
- finding a plurality of second values by calculating the total energies of radical species derived from one-electron reduction of the association complexes, the cation and the anion, and a plurality of third values by calculating the total energies of radical species derived from one-electron oxidization of the association complex, the cation and the anion;
- finding a plurality of fourth values by subtracting the second value from the first value of the plurality of different association complexes, the cation and the anion individually, and finding a plurality of fifth values by subtracting the first value from the third value of the plurality of different association complexes, the cation and the anion individually;
- selecting a maximum forth value from among the fourth values of the plurality of different association complexes, the cation and the anion individually, and selecting a minimum fifth value from among the fifth values of the plurality of different association complexes, the cation and the anion individually, and subtracting the maximum fourth value from the minimum fifth value for finding a sixth value;
- selecting electrolyte having the sixth value higher than a target value;
- measuring a withstanding voltage of a positive electrode and that of a negative electrode with the positive electrode and the negative electrode dipped in the electrolyte;
- and
- setting respective surface areas of the positive electrode and the negative electrode based on the sixth value such that a totaled value of respective withstanding voltages of the positive electrode and the negative electrode can be maximized.
Dependencies are inferred from the claim text.