JPS5918580A - Electrochemical battery - Google Patents

Abstract

PURPOSE:To decrease self discharge in a dope-undope type battery by blowing inactive gas in an electrolyte solution in which an electrode is immersed. CONSTITUTION:100-10,000ml/l of inactive gas such as nitrogen is blown in an electrolyte solution prepared by dissolving an electrolyte in an organic solvent in an electrochemical battery which generates electromotive force by doping and undoping to its electrode. A carbon molded electrode is immersed in this electrolyte solution to form an electrochemical battery. By using this electrolyte solution, self discharge of the battery is suppressed and voltage fall is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a battery in which an electrode is immersed in a solution containing an electrolyte and an electromotive force is generated by doping and/or undoping the electrode.

In recent years, as the issue of energy has become more important, lightweight,
There is a demand for batteries with high energy density, and one of them is to use organic materials such as carbon molded products or polyacetylene as electrodes, which have a small specific gravity and a large specific surface area. A battery has been proposed that utilizes the electromotive force generated by doping both electrodes to n-type and p-type, respectively, and then discharging.

Various materials can be used as electrodes to be doped and/or undoped, but carbon molded products are easy to obtain, are chemically stable, can take various shapes, and have high electrical conductivity. The advantages of
Activated carbon fiber molded products with a large specific surface area of about 0 to 2500 m"/fl can be doped in large quantities,
High energy output is possible.

However, such doped and/or undoped batteries have the disadvantage that self-discharge is severe and the voltage decreases over time.

The inventors of the present invention have conducted various studies in order to eliminate such drawbacks, and have found that by blowing an inert gas into the electrolyte solution of doped and/or undoped batteries, self-discharge of the batteries can be suppressed. They discovered this and completed the present invention.

That is, in the present invention, an electrode is immersed in an electrolyte solution in which MS is dissolved in an organic solvent. Doping the poles and/or
Alternatively, the present invention provides an electrochemical cell that utilizes electromotive force generated by and-ping, characterized in that the electrolyte solution is blown with an inert gas.

The inert gas used in the present invention is i! used in batteries. It has no reactivity with electrolyte solvents and does not oxidize or oxidize under normal electrolytic conditions.
Examples of gases that do not undergo reduction or other chemical reactions include nitrogen, helium, argon, and the like. As the inert gas blowing method, a general method used industrially is used. For example, an operation can be repeated in which the container is kept in a closed system, degassed under reduced pressure, and then returned to normal pressure while blowing inert gas. Furthermore, if sufficient time is available, excellent optical performance can also be achieved by blowing gas directly into the solution using a gas inlet tube in an open system.

Inert gas blowing depends on the type of electrolyte solution, the type of inert gas used, and the conditions of blowing. /l is sufficient.

As the electrolyte of the electrolyte solution used in the battery of the present invention, known electrolytes used in r-type and/or undoped batteries, such as tetraalkyl ammonium salts, alkali metal salts, alkaline earth metal salts (such as Examples of counter anions include perchlorate ion, 67) phosphorus ion, thallium hexafluoride ion, arsenic hexafluoride ion, antimony hexafluoride ion, halogen ion, nitrate ion, sulfate ion, rhenium tetraoxide ion, etc. Examples of organic solvents include known solvents commonly used in woodcutter batteries, such as dimethyl sulfoxide, acetonitrile, propylene carbonate,
-butyrolactone, borumamide, dimethylformamide, methylborumamide, tetrahydrofuran, 1.2
-dimethoxyethane is used.

Further, as the electrode, any electrode that undergoes doping and/or undoping can be used, and electrodes such as polyacetylene and carbon molded products having a large specific surface area are particularly preferred.

Next, the present invention will be explained with reference to Examples.

Example 1 Activated carbon fiber (KF felt) manufactured by Toyobo ■.

F-1600) 1.5cm x 1.5cWL (approximately 4
09) was sandwiched and fixed with a platinum wire between two Teflon plates with holes to form an electrode. Two sets of electrodes thus prepared are immersed in a propylene carbonate solution containing 0.6 molar lithium perchlorate. Furthermore, a gas introduction tube was inserted into the Norobire/carbonate solution, and after washing with a pyrogallol aqueous solution and a caustic potassium aqueous solution, nitrogen gas passed through a calcium chloride tube was passed through the tube at a rate of 5 to i Q ml; / hr for 3 hours, and then the thread was Keep the sheath thread and form a battery. Connect both poles to an external power source and charge at a constant voltage of 2 volts until no current flows. Thereafter, the electromotive force of this battery is measured using a voltage measuring device. Immediately after charging was completed, a rapid voltage drop was observed, but after that it became almost constant at approximately 1.7 volts, and was 1.6 volts 100 hours after charging was completed.

On the other hand, as a comparative example, when we measured the electromotive force of a battery obtained in exactly the same manner except for passing nitrogen gas, the voltage decreased to 1.3 volts 20 hours after charging was completed, and the voltage decreased further. continued.

FIG. 1 shows the temporal changes in the voltages of these two batteries, and it is clear from this that the effect of preventing a voltage drop due to the ventilation of nitrogen gas.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing changes over time in the voltage between the electrodes for a battery in which nitrogen gas was aerated into the electrolyte solution and a battery in which nitrogen gas was not aerated. Procedural amendment (spontaneous) ], case description 1982 Patent Application No. 128232-'; 32
Name of the invention Electrochemical cell 3, Relationship to the case of the person making the amendment Applicant address 1-114-10, Kayabacho, Nihonbashi, Chuo-ku, Tokyo Name (091) Kao Soap Co., Ltd. Representative Maru 1) Yoshibe 4 , Agent 6, "Detailed Description of the Invention" column 7 of the specification to be amended, contents of the amendment (1) Toyonaka No. 2 Jj, line 12, r5oOJ is corrected to rloOJ.

Claims (1)

[Claims] 1. An electrode is immersed in an electrolyte solution in which an electrolyte is dissolved in an organic solvent, and the electrode is doped and/or undoped.
1. An electrochemical cell that utilizes electromotive force generated by pinging, characterized in that the electrolyte solution is blown with an inert gas. 2. The electrochemical cell according to claim 1, wherein the inert gas is nitrogen, helium, or argon.