JPS6039775A - Polyacetylene battery - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to polyacetylene batteries, and is particularly suitable for simplifying the connection between an electrode active material and a current collector, and simplifying and reducing the thickness of the battery. Regarding polyacetylene batteries.

[Background of the invention]

In a conventional polyacetylene battery, as shown in FIGS. 1 and 2, polyethylene 2 is arranged on the inner wall of an exterior sheet-like conductor 1 made of Atsube foil. In addition, a sheet-like conductor 3 is interposed in the center of the laminated portion, and electrodes 6 made of expanded metal 4 and gel-like polyacetylene crimped are interposed on both sides of the sheet-like conductor 3. On the outside, an electrode 6 is interposed with a separator 5 interposed therebetween, in which gel-like polyacetylene is pressure-bonded to an xeno-kunded metal.

In such a conventional polyacetylene battery, it is necessary to connect the leads 7 to expanded metals constituting the electrodes of the cells at both ends of the stack. To do this, remove a part of the polyacetylene stuck to the extract band metal 4,
It is necessary to connect the lead 7 to the exposed expanded metal portion, or to allow a portion of the expanded metal to protrude when attaching polyacetylene in advance.

In order to connect the lead 7 to the extended metal 4 in this way, a space for connecting the lead 7 is required. Furthermore, although the leads 7 are buried in the polyethylene 2, short circuits easily occur between the leads 7 and the exterior conductive sheet 1, and the electrolyte 1 leaks from the gaps created between the leads 7 and the polyethylene 2. There are drawbacks. On the other hand, if an electrode is used in which the expanded metal and the polyacetylene film are simply attached without pressing gel-like polyacetylene onto the expanded metal, the adhesion between the polyacetylene film and the expanded metal is poor and the internal resistance of the battery increases. However, there is a problem that the battery performance is inferior.

[Purpose of the invention]

The purpose of the present invention is to solve the above-mentioned problems of the prior art, reduce the number of battery parts such as leads, make the battery shape simple and thin, and improve battery performance by suppressing increase in internal resistance. The object of the present invention is to provide a polyacetylene battery that can be improved.

[Summary of the invention]

In the present invention, the electrodes at both ends of the stacked cell are made by fixing polyacetylene to one side of a sheet-like conductor, so that this sheet-like conductor functions as a lead and improves the adhesion inside the cell. It is something.

[Embodiments of the invention]

FIG. 3 is a sectional view of a battery showing an embodiment of the present invention, in which an expanded metal 4 is spot welded to two sheet-like conductors 8 for the case, and a gel polymer is crimped onto the electrode. The structure is as follows.

The inside of the stack is connected to the lower layer side Vc as in the embodiments shown in FIGS. 1 and 2.
An electrode 6 on which a gel-like polymer is fixed is interposed on the expanded metal 4 through the electrode 6, and a sheet-like conductor 3 is interposed in the center of the expanded metal 4.
Electrode 6 to which polyacetylene is fixed, then separator 5
seems to be intervening.

In such a polyacetylene electrode, the expanded metal is directly welded to the sheet-like conductor 8 for the case, so this sheet-like conductor 8 itself serves as the lead 7 shown in FIG. . Further, since polyethylene is not fixed to the inner surface of the sheet-like conductor 8, the polyacetylene battery can be made thinner. Furthermore, since the shell-like polyacetylene is fixed between each laminated layer, an increase in the internal resistance of the battery can be prevented.

FIG. 5 is a cross-sectional view of a main part showing another embodiment of the present invention, in which a conductive polymer 9 made of polyethylene and carbon powder is adhered to a sheet-like conductor 8 surface. Polyacetylene is crimped onto the brush-like fluff on the surface.

In FIG. 6, carbon fibers 10 made of a conductive polymer made of polyethylene and carbon powder are attached to 8 surfaces of a sheet-like conductor, and polyacetylene is fixed thereto.

In FIG. 7, a conductive sprayed material 11 is formed by spraying metal on eight surfaces of a sheet-like conductive body, and polyacetylene is adhered to these surfaces.

In FIG. 8, the surface of a sheet-like conductor 8 is made into a rough surface 12 by means such as etching, and polyacetylene is adhered to the surface.

In the embodiments shown in FIGS. 5 to 8, the sheet-like conductor 8 also serves as the lead 7 in FIG.
becomes unnecessary. In addition, since the sheet-like conductor and polyacetylene are in close contact with each other, an increase in internal resistance of the battery can be prevented.

In order to prevent an increase in the internal resistance of the battery, gel-like polyacetylene should be adhered to both or one side of the sheet-like conductor 3 in the central portion, and the gel-like polyacetylene should also be pressure-bonded to the separator 5. The battery can be made into a sheet while preventing an increase in internal resistance due to the battery.

Example 1 In Fig. 1, gel polyacetylene was heated at a pressure of 1 t/-.
Crimp it to 5US304 extract band metal and SU
A lead 7 made of S wire mesh coated with polyethylene is welded to the expanded metal, a conductive sheet made of polyethylene with carbon powder added is sandwiched between two electrodes in the center, a polypropylene nonwoven fabric is used as the separator 5, and the first A battery was constructed as shown in the figure. (Battery A) No. 6
A battery as shown in FIG. 3 was constructed using a current collector using carbon fiber as shown in the figure. (Battery B) A battery as shown in FIG. 3 was constructed using a current collector in which a fluff-like portion made of a conductive polymer was formed on a sheet-like conductor in FIG. (Battery C) A battery as shown in FIG. 3 was constructed using an electrode whose surface was roughened by etching the surface of a sheet-like conductor with HF + HN Os. (Battery D) A battery as shown in FIG. 3 was constructed using a current collector using a conductive sprayed material as shown in FIG. (Battery E) A battery as shown in FIG. 3 was constructed using an electrode made of expanded metal welded as shown in FIG.

(Battery F) In each of these batteries, 1 moz of (C2H5) 4 NCICh was added to 1 ton of acetonitrile as the electrolyte.
The dissolved one was used. All battery components were dehydrated, assembled and sealed in a glove box filled with dry argon gas. The electrodes in each battery each have an area of 6.
25C4, the density of polyacetylene is 0.94 g/CC.

FIG. 9 shows the charge/discharge % voltage line when these batteries were charged and discharged at room temperature at a current density of 1 mA/c4. The charging time was 1 hour for each battery, but the charging time decreased in the order of battery A to battery F. However, when discharging, the battery voltage reverses and the elapsed time when it drops to IV is 48 minutes for battery A and 8 minutes for battery A.
50 minutes, battery 052 minutes, battery D5' 4 minutes, battery E 55 minutes, and battery F 56 minutes. If we calculate the current efficiency from these measured values, the battery A80. Battery B84. Battery C87, Battery D
90. The battery was E9:L, and the battery was F1a. . The reason why the voltage of the conventional battery (Battery A) is particularly high during charging is that when you pick the battery with your fingers, the voltage drops, which is due to the contact resistance between the expanded metal as a current collector and the seed conductor. It seems that it will.

Among the batteries of the present invention, especially those using conductive polymers, the voltage is relatively high, so it is thought that the resistance of these conductive polymers is the cause.

From an industrial perspective, nickel powder spraying, expanded metal, etc. are the most promising electrode configurations.

〔Effect of the invention〕

As described above, according to the present invention, the sheet-like conductors on both sides of the laminated cell serve as leads, so battery parts such as leads can be omitted, and the adhesion between the sheet-like conductors and polyacetylene is Since the resistance is high, an increase in the internal resistance of the battery can be prevented, and since there is no need to interpose the polyethylene inside the sheet-like conductor as in the example, the sheet can be made thinner.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional polyacetylene battery, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a sectional view of a polyacetylene battery showing an embodiment of the present invention, and FIG. Third
FIGS. 5, 6, 7, and 8 are sectional views of main parts of the battery shown in FIG. FIG. 9 is a graph showing the relationship between charging and discharging times of polyacetylene batteries and battery voltage. DESCRIPTION OF SYMBOLS 1... Sheet-like conductor (aluminum foil), 2... Polyethylene, 3... Note-like conductor, 4... Expanded metal, 5... Separator, 6... Polyacetylene electrical contact, 7...Lead, 8...Sheet-like conductor (for case), 9...Conductive polymer, 10...Carbon fiber, 11...Conductivity% 1 Figure 9 Flit) Continued from page 1 0 Inventor Hiroyuki Sugimoto Inside Saiwai-cho, Hitachi City 0 Inventor Atsuko Toyama Inside Saiwai-cho, Hitachi City 0 Inventor Matsu 1) Omi Taira Inside Saiwai-cho, Hitachi City

Claims (1)

[Claims] 1. In a rechargeable polyacetylene battery in which cells having polyacetylene electrodes are stacked, one electrode of the cells at both ends of the stacked cells is formed by fixing polyacetylene to one side of an exterior sheet conductor. A polyacetylene battery characterized by comprising: 2. The polyacetylene battery according to claim 1, wherein the sheet-like conductor is a metal sheet with expanded metal welded and fixed. 3. The polyacetylene battery according to claim 1, wherein the sheet-like conductor is a sheet made of a conductive polymer with one side fluffed. 4. The polyacetylene battery according to claim 1, wherein the sheet-like conductor is a metal sheet with carbon fibers attached to one side. 5. The polyacetylene battery according to claim 1, wherein the sheet-like conductor is a metal sheet with metal sprayed on one side. 6. The sheet-like conductor is formed by etching one side of a metal sheet to form a rough surface.
The polyacetylene battery described in Section 1.