JP2013033937A - Electrochemical cell and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow for efficient improvement of corrosion resistance of an electrochemical cell by eliminating the need of post steps such as a terminal welding step and post processing such as coating removal at mounting on a battery holder and the like by forming a coating only on a region which needs corrosion resistance.SOLUTION: An electrochemical cell 1 in which an insulating coating agent 2 is coated on its surface comprises: a positive electrode can 5; a negative electrode can 3; and a gasket 4 held between the positive electrode can 5 and the negative electrode can 3. A central part 31 of the negative electrode can and a bottom part 51 of the positive electrode can have a non-coated region of the coating agent 2.

Description

  The present invention relates to an electrochemical cell such as a non-aqueous electrolyte secondary battery, an electric double layer capacitor, and a silver oxide battery, and a method for producing the same.

  In a coin-shaped small electrochemical cell such as an electric double layer capacitor, a metal such as stainless steel is used for an exterior body such as a positive electrode can and a negative electrode can. The exterior body is usually subjected to nickel plating or the like in order to reduce the contact resistance between the mounted electronic device and the cell.

  The stainless steel and nickel plating form a dissimilar metal interface on the respective end faces of the positive electrode can and the negative electrode can. In particular, since the interface at the upper end of the positive electrode can is exposed to the outside, it may corrode due to the effect of water and oxygen. In addition, due to the influence of the electrolytic solution decomposition caused by the voltage applied to the cell and the high heat applied during reflow mounting, the gas containing the electrolytic solution or the vapor or splash of the electrolytic solution may leak to the outside. Halide ions such as chloride ions and fluoride ions present in the electrolyte further accelerate corrosion.

  The rust generated on the surface of the electrochemical cell by such a corrosion process contaminates not only the appearance defect of the electrochemical cell but also the substrate circuit of the mounted equipment and other devices as the rust expands and scatters. In addition, there are concerns about the effects of electrical shorts caused by rust scattered on the circuit. Therefore, measures are required to improve the corrosion resistance of the exterior body and prevent the occurrence of rust.

  As countermeasures for improving the corrosion resistance, there are methods of applying a coating to the member in addition to using a highly corrosion-resistant stainless steel member for the exterior body. For example, a battery in which a terminal is previously welded to at least one of a sealing plate and a case, and the entire surface of the battery is covered with a thin film-like electrically insulating resin layer except for a part of the terminal so that electrical contact can be made. A terminal-equipped lithium battery is disclosed. Specifically, the battery with terminals is immersed in a resin solution of silicone varnish by an immersion method, and then left at room temperature for about 24 hours to cure the resin and coat the battery surface with a film-like coating layer ( For example, Patent Document 1).

Japanese Patent Laid-Open No. 5-190159

  On the other hand, when an electrochemical cell is used without terminal welding in a holder battery or the like, if the entire surface is coated with a coating agent, the cell and the terminal of the holder cannot be electrically connected. Therefore, it is necessary to partially peel off the resin at the connection location after application. In that case, the number of man-hours may increase due to peeling, or the appearance may deteriorate due to mechanical destruction of the resin.

  In order to reduce costs, the terminal welding process may be performed at a site different from the cell assembly. In that case, it is necessary to improve corrosion resistance at the cell stage for transportation. However, if the cell and the terminal coated on the entire surface are welded, the resin is destroyed by the heat and impact of the terminal welding process. Therefore, it is necessary to coat only the portions necessary for improving the corrosion resistance in advance.

The present invention provides the following means in order to solve the above problems.
An electrochemical cell according to the present invention comprises a positive electrode can, a negative electrode can, and a gasket sandwiched between the positive electrode can and the negative electrode can, and an insulating coating agent is applied to the surface. In the negative electrode can center part and the positive electrode can bottom part, it has the uncoated area | region of the said coating agent.
In the present invention, by providing the electrochemical cell with an uncoated region of the coating agent, it is possible to secure an electrical connection location of the cell after coating in advance. Therefore, the corrosion resistance can be improved efficiently without peeling off the coating film in the subsequent step.

In the electrochemical cell according to the present invention, the coating agent is applied to a gap formed between the upper end portion of the positive electrode can and the gasket and a gap formed between the negative electrode can and the gasket. Features.
In the present invention, because of leakage of the electrolytic solution, crevice corrosion due to halide ions such as chlorine and fluorine contained in the electrolytic solution can be prevented.

The electrochemical cell according to the present invention is characterized in that the coating agent is applied to the gap formed between the upper end of the positive electrode can and the gasket, and to the side of the positive electrode can.
In the present invention, the coating agent can be applied to the minimum on the positive electrode side that is easily oxidized by voltage application.

In the electrochemical cell according to the present invention, the surfaces of the positive electrode can and the negative electrode can are subjected to nickel plating, a gap formed between the negative electrode can and the gasket, and an upper end portion of the positive electrode can and the gasket. The coating agent is applied from a gap formed therebetween to the side of the positive electrode can.
In the present invention, the gap formed between the negative electrode can and the gasket and the gap formed between the upper end of the positive electrode can and the gasket to the side of the positive electrode can are coated by nickel corrosion. Rust generation can be prevented.

In the electrochemical cell according to the present invention, the positive electrode can and the negative electrode can are made of stainless steel without plating, a gap formed between the upper end of the positive electrode can and the gasket, and the negative electrode can and the gasket The coating agent is applied to a gap formed therebetween.
In the present invention, crevice corrosion of stainless steel can be prevented by forming a film between the positive electrode can, the negative electrode can and the gasket.

The electrochemical cell according to the present invention is characterized in that the coating agent contains silica.
In the present invention, a coating film containing dense and high-purity silica is formed on the electrochemical cell by applying the coating agent to the electrochemical cell. This film has water repellency and can prevent moisture from penetrating moisture or condensation in the external environment. Thereby, corrosion of a positive electrode can and a negative electrode can can be prevented.

  Further, the coating film containing silica has electrical insulation. Therefore, even if moisture adheres due to condensation or the like, a short circuit between the positive electrode can and the negative electrode can can be prevented, and corrosion due to electrolysis can be prevented. Furthermore, the coating film has heat resistance, and the coating film is not destroyed by thermal decomposition or the like even when it is mounted on the substrate of the mounted device through the reflow mounting process. Therefore, the surface water repellency and electrical insulation of the coating film containing silica are maintained even after the reflow mounting process.

The electrochemical cell according to the present invention is characterized in that, of the thickness of the coating formed by the coating agent, the thickness at the upper end of the positive electrode can is 0.1 μm or more and 30 μm or less.
In the present invention, a coating film containing silica having electrical insulation is formed. As for the film thickness, if it is thin, it is impossible to ensure electrical insulation against electric corrosion caused by condensation and voltage application. On the other hand, if it is too thick, cracks are likely to enter the film due to the difference in thermal expansion coefficient between the film and the metal of the positive electrode can and the negative electrode can. An appropriate thickness may be 0.1 to 30 μm.

In the electrochemical cell according to the present invention, the maximum thickness of the coating film of the coating agent is thicker than the thickness of the coating film at the upper end portion of the positive electrode can in the gap formed between the upper end portion of the positive electrode can and the gasket. It is characterized by.
In the present invention, since a larger amount of coating agent is applied in the gap formed between the upper end of the positive electrode can and the gasket, and the coating is formed thick, the leakage of the electrolyte from the inside of the cell is stopped. Can do.

The electrochemical cell manufacturing method according to the present invention includes a step of forming an electrochemical cell by sandwiching a gasket between a positive electrode can and a negative electrode can, a step of attaching the coating agent to a stamp, and a negative electrode can central portion. And a step of transferring the stamp so as to have a region where the coating agent is not applied on the bottom of the positive electrode can.
In the present invention, by appropriately adjusting the shape of the stamp and the pattern of the coating agent applied to the stamp, the location applied to the electrochemical cell can be easily changed. Thereby, compared with the method of coating and apply | coating a coating agent from a syringe, and methods, such as brush coating and wiping, efficient application | coating can be performed.

The method for producing an electrochemical cell according to the present invention includes a step of forming an electrochemical cell by sandwiching a gasket between a positive electrode can and a negative electrode can, a step of placing a masking material on top of the negative electrode can, The method comprises spraying the coating agent so as to have an unapplied region of the coating agent at the center of the negative electrode can and the bottom of the positive electrode can, and removing the masking material after forming the film. .
In the present invention, since a large amount of processing can be performed at one location from application of the coating agent to heat treatment, the coating agent can be applied more efficiently than the method of coating and applying the coating agent from a syringe, the method of brush coating, wiping, etc. It can be carried out.

The method for producing an electrochemical cell according to the present invention is characterized in that a mixture of at least one of a polysilazane composition or a silicone resin and an organic solvent is applied as the coating agent.
In the present invention, since a dense and high-purity silica film is formed, it is possible to prevent moisture from penetrating moisture or condensation in the external environment. Thereby, corrosion of a positive electrode can and a negative electrode can can be prevented.

The method for producing an electrochemical cell according to the present invention is characterized in that the polysilazane composition has an alkyl group.
In the present invention, since the coating film has high water repellency, it is possible to prevent condensation and the like, and to prevent corrosion of the positive electrode can and the negative electrode can.

  By forming a coating only in areas where corrosion resistance is required, it is possible to efficiently perform electrochemical cells without the need for post-processing such as peeling of the coating when it is mounted on a battery holder or other post-process such as a terminal welding process. Corrosion resistance can be improved.

It is sectional drawing of the electrochemical cell which shows embodiment concerning this invention. It is sectional drawing of the electrochemical cell which shows another example of embodiment concerning this invention. It is sectional drawing of the electrochemical cell which shows another example of embodiment concerning this invention. It is a schematic diagram which shows the coating method using a stamp which shows embodiment concerning this invention. It is a schematic diagram which shows the coating method by the spray process which shows embodiment concerning this invention.

Hereinafter, embodiments according to the present invention will be described with reference to FIGS. 1 to 3.
The electrochemical cell 1 shown in FIG. 1 includes a negative electrode can 3, a positive electrode can 5, and a gasket 4 sandwiched between the negative electrode can 3 and the positive electrode can 5. Further, as the power generation element, a negative electrode 6, a positive electrode 7, a separator 8, and an electrolyte solution (not shown) are incorporated in the electrochemical cell 1. The positive electrode can 5 is sealed by caulking the opening to the negative electrode can 3 via the gasket 4.
Hereinafter, as an embodiment of the electrochemical cell, the structure of an electric double layer capacitor will be described. In the electric double layer capacitor, the following heat-resistant material is used to perform the reflow mounting process.

The negative electrode can 3 and the positive electrode can 5 are made of a metal material such as iron or stainless steel, and the surface thereof is nickel-plated. The negative electrode 6 and the positive electrode 7 are composed of activated carbon sheets.
The separator 8 is made of glass fiber and impregnated with an electrolytic solution. In addition to glass fibers, resins such as polyphenylene sulfide, polyethylene terephthalate, polyamide, and polyimide are used.

  The gasket 4 is made of a material having a heat distortion temperature of 230 ° C. or higher in order to maintain heat resistance during reflow mounting. Specifically, polyether ether ketone (PEEK) resin, polyphenylene sulfide (PPS) resin, liquid crystal polymer (LCP), polyether nitrile (PEN) resin and the like are used. Further, in order to improve molding accuracy and air tightness, a high sliding molding material blend such as potassium titanate is added to these resins.

In the electrolytic solution, a solvent having a boiling point of 200 ° C. or higher is used as a main solvent. Specifically, γ-butyrolactone, ethylene carbonate, propylene carbonate, sulfolane and the like are used.
The coating agent 2 is applied over the positive electrode can side portion 52, the positive electrode can upper end portion 53, the gasket 4, and the negative electrode can side portion R32. That is, it has an uncoated region that is not applied to the negative electrode can center portion 31 and the positive electrode can bottom portion 51.

  As the material of the coating agent 2, the following are particularly suitable. For example, polysilazane changes to silicon-oxygen by an oxidation reaction in which the silicon-nitrogen bond of silazane reacts with water or oxygen in the atmosphere under normal temperature or high temperature heat treatment. A dense and high-purity silica film can be formed. Therefore, the coating has water repellency, electrical insulation, and heat resistance. Similarly, a silicone resin having a siloxane bond forms a dense and high-purity silica film, and has water repellency, electrical insulation, and heat resistance.

  Moreover, the coating agent 2 can adjust the thickness and viscosity of a film arbitrarily by melt | dissolving or disperse | distributing to various organic solvents in arbitrary ratios. As the organic solvent, various compounds such as alcohols, ethers, esters, ketones, and aromatic compounds such as toluene and xylene can be used. Thereby, workability | operativity and corrosion resistance can be improved and it is suitable. Moreover, even if it is a solvent-free liquid silicone resin, in order to adjust a viscosity and the thickness of a film, it is preferable to dilute with various organic solvents.

  In FIG. 1, application areas are a positive electrode can side part 52, a positive electrode can upper end part 53, a gasket 4, and a negative electrode can side part R <b> 32. That is, it has a non-application area | region which is not apply | coated to the negative electrode can center part 31 and the positive electrode can bottom part 51. FIG.

  Another example of the application region in this embodiment is shown in FIG. In the electrochemical cell 10, the coating agent 21 fills a gap formed between the positive electrode can upper end 53 and the gasket 4 and a gap formed between the negative electrode can side R 32 and the gasket 4. It has been applied.

  FIG. 3 shows still another example of the application region in the present embodiment. In the electrochemical cell 20, the coating agent 22 is applied to the positive electrode can side portion 52, and is applied so as to fill a gap formed between the positive electrode can upper end portion 53 and the gasket 4.

Next, a method for applying the coating agent will be described.
In addition to wiping, the coating method can be applied by various methods such as brushing, stamping, discharging the coating agent 2 from a syringe, spraying, and the like. Thereafter, the coating agent is cured through a reaction such as dehydration and polymerization by heat treatment. In particular, in consideration of a mass production process, in order to apply efficiently, application using a stamp and application using a spray will be described below.

  FIG. 4 shows an example of a coating method using a stamp. As shown in FIG. 4A, the stamp 11 includes a transfer unit 12 that applies the stamp to the electrochemical cell 17 before coating, and a holding unit 13. First, the coating agent 14 is applied to the stamp table 15 in advance in accordance with the area to be coated on the electrochemical cell 17 before coating. Then, by pressing the stamp transfer unit 12 against the stamp table 15, as shown in FIG. 4B, the patterned coating agent 16 is transferred to the stamp. Further, the stamp is pressed against the electrochemical cell 17 before coating. In this way, the coating agent 18 is applied to the region shown in FIG. Thereafter, the coating agent 18 is cured by heat treatment to form a dense and high-purity silica film.

  In this way, the coating agent 18 can be applied to the electrochemical cell 17 by applying the coating agent 18 to the stamp transfer portion 12 and transferring it to the electrochemical cell 17 as it is. Here, by appropriately adjusting the shape of the stamp 11 and the pattern of the coating agent 18 to be applied to the stamp 11, the place to be applied to the electrochemical cell 17 can be easily changed. Thereby, compared with the method of coating and apply | coating the coating agent 18 from a syringe, and methods, such as brush coating and wiping, more efficient application | coating can be performed.

  FIG. 5 shows an example of a coating method using a spray. First, as shown in FIG. 5A, a masking material 19 made of a polyimide sheet is placed on the central portion 31 of the negative electrode can of the electrochemical cell 17 before coating. Thereafter, as shown in FIG. 5B, the electrochemical cells 17 before coating are arranged on the stage 25, and the coating agent 24 is sprayed from above by the spray 23. In this manner, the mist-like coating agent 24 is applied to the electrochemical cell 17 before coating, and is cured by heat treatment to form a dense and high-purity silica film. Thereby, compared with the method of coating and apply | coating a coating agent from a syringe, and methods, such as brush coating and wiping, efficient application | coating can be performed.

As the masking material, a material whose melting point exceeds the heat treatment temperature and does not fuse to the electrochemical cell by the heat treatment is preferable. For example, a tetrafluoroethylene resin, a polyimide resin, or the like is suitable as a masking material because the melting point greatly exceeds 200 ° C., and if it is in the form of a sheet, peeling after heat treatment is easy. Thereby, formation of the uncoated area | region of the partial film in the negative electrode can center part 31 is performed easily.
In order to confirm the corrosion resistance of the electrochemical cell coated with the coating agent thus prepared, a storage test was conducted as follows.

Example 1
First, as an exterior body, a negative electrode can 3 made of stainless steel having a nickel plating formed on the surface, a positive electrode can 5, and polyether ether ketone (PEEK) sandwiched between the negative electrode can 3 and the positive electrode can 5. A gasket 4 was provided. Moreover, the negative electrode 6, the positive electrode 7, the separator 8, and electrolyte solution were provided as an electric power generation element. A negative electrode 6, a positive electrode 7, a separator 8 and an electrolytic solution are placed in an internal space formed by the positive electrode can 5, the gasket 4 and the negative electrode can 3, and the opening of the positive electrode can 5 is caulked to the negative electrode can 3 via the gasket 4 to seal did. In this way, an electric double layer capacitor as an electrochemical cell was produced.

  Next, a coating agent composed of a mixed solution containing polysilazane having an alkyl group and ethyl acetate as main components was applied to the region shown in FIG. 1 by wiping on the electrochemical cell before coating. Furthermore, it heat-processed at 150 degreeC for 1 hour, and formed the silica film.

  After the formation of the silica coating, the SEM cross section of the cell was observed, and the thickness of the silica coating was determined. The thickness varied from 0.1 to 3.6 μm depending on the application location. In particular, the thickness of the coating film at the upper end portion 53 of the positive electrode can was 2.3 μm, and the thickness of the coating film in the gap formed between the upper end portion 53 of the positive electrode can 53 and the gasket 4 was 2.8 μm.

(Example 2)
An electric double layer capacitor as an electrochemical cell before coating was produced by the method described in Example 1. Next, what diluted 5-10 volume% of silicone resins in the mixed alcohol which has ethanol as a main component was apply | coated to the electrochemical cell before coating to the area | region shown in FIG. 1 by wiping. This was aged at room temperature for 8 days to form a silica coating.

(Example 3)
A silver oxide battery as an electrochemical cell was produced by the following method. That is, as an outer package, a negative electrode can 3 made of stainless steel with a nickel layer formed on the surface, a positive electrode can 5 made of iron with a nickel plating formed on the surface, and the negative electrode can 3 and the positive electrode can 5 are sandwiched between the negative electrode can 3 and the positive electrode can 5. A gasket 4 made of inserted nylon was provided. Moreover, the negative electrode 6, the positive electrode 7, the separator 8, and electrolyte solution were provided as an electric power generation element. A negative electrode 6, a positive electrode 7, a separator 8 and an electrolytic solution are placed in an internal space formed by the positive electrode can 5, the gasket 4 and the negative electrode can 3, and the opening of the positive electrode can 5 is caulked to the negative electrode can 3 via the gasket 4 to seal did.

  Next, what diluted 5-10 volume% of silicone resins in the mixed alcohol which has ethanol as a main component was apply | coated to the electrochemical cell before coating to the area | region shown in FIG. 1 by wiping. This was aged at room temperature for 8 days to form a silica coating.

(Comparative Example 1)
An electric double layer capacitor was produced as an electrochemical cell before coating by the method described in Example 1. This was directly applied for evaluation without coating as shown in Example 1 and Example 2.

(Comparative Example 2)
An electric double layer capacitor was produced as an electrochemical cell before coating by the method described in Example 1. Next, a coating agent made of a mixed solution containing polysilazane having an alkyl group and ethyl acetate as main components was applied to the prepared electrochemical cell before coating in a region shown in FIG. Furthermore, it heat-processed at 150 degreeC for 1 hour, and formed the silica film.

  After the formation of the silica coating, the SEM cross section of the cell was observed to determine the thickness of the silica coating, and the thickness varied from 5 μm to 45 μm depending on the application location. In particular, the thickness of the coating film at the upper end portion 53 of the positive electrode can was 32 μm, and the thickness of the coating film in the gap formed between the upper end portion 53 of the positive electrode can 53 and the gasket 4 was 40 μm.

(Comparative Example 3)
A silver oxide battery was produced as an electrochemical cell before coating by the method described in Example 3. This was directly applied for evaluation without coating as shown in Example 3.

  The corrosion resistances of Examples 1 and 2 and Comparative Example produced as described above were comparatively evaluated. About each electric double layer capacitor of Example 1, Example 2, Comparative Example 1, and Comparative Example 2, a voltage of 3.3 V was continuously applied in a high-temperature and high-humidity environment at a temperature of 60 ° C. and a relative humidity of 93%. Applied. In each Example and Comparative Example, n = 15 is added to the test, and the number of visual rust occurrences after 10 days is shown in Table 1.

As shown in Table 1, in Example 1, the number of occurrences of rust was 0 out of 15, and in Example 2, it was 1 out of 15. On the other hand, in Comparative Example 1, the number of rust generations was 5 out of 15, and the rust generation rate reached 33%. Thereby, the effect which corrosion resistance improves with a coating agent was shown.
Further, in Comparative Example 2, all (15 out of 15) cracks occurred on the side of the positive electrode can, and green rust occurred from the occurrence location. It was confirmed that the durability deteriorates as the film becomes thicker.

  Next, the corrosion resistance of the silver oxide batteries of Example 3 and Comparative Example 3 was examined. Table 2 shows n = 24 samples stored in a high-temperature and high-humidity environment of 60 ° C. and 93% for 60 days, and the number of rusts visually observed.

As shown in Table 2, in Example 3, the number of occurrences of rust was 0 out of 24. Moreover, the number of occurrences of rust in Comparative Example 2 was 2 out of 24, and rust was seen in 8.3%. Thereby, also in Example 3, the effect which corrosion resistance improves by a coating agent was shown.
As described above, the corrosion resistance of the electrochemical cell could be improved also by performing the coating treatment only at a necessary portion.

DESCRIPTION OF SYMBOLS 1, 10, 20 Electrochemical cell 2, 14, 16, 18, 21, 22, 24 Coating agent 3 Negative electrode can 4 Gasket 5 Positive electrode can 6 Negative electrode 7 Positive electrode 8 Separator 31 Negative electrode can center part 32 Negative electrode can side part R
51 Cathode can bottom 52 Cathode can side 53 Cathode can top 11 Stamp 12 Stamp transfer unit 13 Stamp holder 15 Stamp stand 17 Electrochemical cell 19 before coating Masking material 23 Spray can 25 Stage

Claims (12)

In an electrochemical cell comprising a positive electrode can, a negative electrode can, and a gasket sandwiched between the positive electrode can and the negative electrode can, and an insulating coating agent is applied to the surface,
An electrochemical cell having an uncoated region of the coating agent at the center of the negative electrode can and the bottom of the positive electrode can.   2. The electricity according to claim 1, wherein the coating agent is applied to a gap formed between an upper end portion of a positive electrode can and the gasket and a gap formed between the negative electrode can and the gasket. Chemical cell.   The electrochemical cell according to claim 1 or 2, wherein the coating agent is applied to a gap formed between the upper end portion of the positive electrode can and the gasket and to a side portion of the positive electrode can. The surfaces of the positive electrode can and the negative electrode can are subjected to nickel plating,
A gap formed between the negative electrode can and the gasket;
The electrochemical cell according to claim 1, wherein the coating agent is applied from a gap formed between the upper end portion of the positive electrode can and the gasket to a side portion of the positive electrode can. The positive electrode can and the negative electrode can are made of stainless steel without plating,
The said coating agent was apply | coated to the clearance gap formed between the said positive electrode can upper end part and the said gasket, and the clearance gap formed between the said negative electrode can and the said gasket. Electrochemical cell.   The electrochemical cell according to any one of claims 1 to 5, wherein the coating agent contains silica.   7. The electrochemical cell according to claim 1, wherein, of the thickness of the coating formed by the coating agent, the thickness at the upper end of the positive electrode can is 0.1 μm or more and 30 μm or less. .   8. The maximum thickness of the coating film of the coating agent is larger than the thickness of the coating film at the upper end portion of the positive electrode can in the gap formed between the upper end portion of the positive electrode can and the gasket. The electrochemical cell as described in any one of these. Forming an electrochemical cell by sandwiching a gasket between the positive electrode can and the negative electrode can;
Attaching the coating agent to the stamp;
And a step of transferring the stamp in accordance with a position where the stamp is applied to the electrochemical cell so as to have an uncoated region of the coating agent at the center of the negative electrode can and the bottom of the positive electrode can. Method. Forming an electrochemical cell by sandwiching a gasket between the positive electrode can and the negative electrode can;
Placing a masking material on top of the negative electrode can;
Spraying the coating agent so as to have an unapplied region of the coating agent at the center of the negative electrode can and the bottom of the positive electrode can; and
And a step of removing the masking material after the coating is formed.   The method for producing an electrochemical cell according to claim 9 or 10, wherein a mixture of at least one of a polysilazane composition or a silicone resin and an organic solvent is applied as the coating agent.   The method for producing an electrochemical cell according to claim 11, wherein the polysilazane composition has an alkyl group.

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