JP2013133480A - Method and device for removing moisture from aprotic polar solvent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for removing moisture from aprotic polar solvent, by means of which moisture can be extremely accurately removed without applying a voltage of decomposition voltage of aprotic polar solvent or more and without performing high-temperature heating.SOLUTION: The method for removing moisture from aprotic polar solvent 8 is performed by using a membrane electrode assembly 110 which comprises a solid electrolyte layer 101, a first electrode layer 103 disposed on one side of the solid electrolyte layer and a second electrode layer 102 disposed on the other side of the solid electrode layer, wherein a voltage is applied to the first electrode layer and the second electrode layer, thereby, oxygen ion is separated from moisture in the aprotic polar solvent which is brought into contact with the first electrode layer, at the same time, hydrogen gas is generated, the hydrogen gas is released from the solvent and, meanwhile, the oxygen ion is moved to the second electrode layer via the solid electrolyte layer and is released.

Description

  The present invention relates to a method and apparatus for removing moisture from an aprotic polar solvent, and more particularly to a method and apparatus for removing moisture mixed in an aprotic polar solvent such as a non-aqueous plating solution and a battery electrolyte.

  For example, since the electrodeposition potential of aluminum is lower than the potential of hydrogen generation, plating using an aqueous solution is difficult. For this reason, in electrolytic aluminum plating, a nonaqueous organic solvent, a room temperature molten salt plating solution such as an imidazolium salt, or an electrolytic aluminum plating solution using dimethyl sulfone or the like as a solvent is used.

  In the field of capacitors and lithium secondary batteries, various non-aqueous electrolytes are used in order to achieve high energy density and to reduce the size and weight of electronic devices.

  The aprotic polar solvent does not have a proton donating property, has a large polarity, and dissolves organic compounds and metal salts well. Therefore, the aprotic polar solvent is often used as a non-aqueous plating solution or an electrolytic solution for batteries.

  When non-aqueous plating of aluminum or the like is performed, water adhering to the workpiece is often mixed into the plating solution. If moisture is mixed in the non-aqueous plating solution, the current does not flow uniformly in the plating solution due to the influence of moisture, and a highly accurate plating layer cannot be formed. In addition, since a voltage higher than the water decomposition voltage acts by the voltage applied in the plating step, the water is electrolyzed to generate hydroxide ions. The hydroxide ions react with the components of the non-aqueous plating solution to deteriorate the plating solution, and the number of times it can be used repeatedly is reduced. Since the non-aqueous plating solution is more expensive than a normal plating solution, there arises a problem that the product cost increases.

  In addition, in the battery manufacturing process or the like, when water is contained in the battery non-aqueous electrolyte, the generated hydroxide ions deteriorate the electrolyte. For this reason, there arises a problem that the battery can be repeatedly charged and the battery performance is lowered.

  In order to solve the above problem, a technique for removing water from a plating solution or an electrolytic solution using zeolite or the like has been proposed.

JP 2002-1107 A

  In the invention described in the above-mentioned patent document, zeolite with improved dehydration performance is used, but the water removing ability in the electrolytic solution is about 5 to 10 ppm. On the other hand, although the non-aqueous plating solution is used repeatedly, since moisture is mixed every time plating is performed, even if the moisture can be removed to a concentration of about 5 to 10 ppm, a sufficient effect cannot be expected. Further, at the above concentration, it is necessary to frequently perform a process of removing moisture.

  Moreover, in the method described in the said patent document, in order to acquire said effect, it is necessary to heat a plating solution at about 500 degreeC. However, when the plating solution is heated to a high temperature, the deterioration may be accelerated, and the applicable plating solution is limited.

  Furthermore, since the above zeolite cannot be used repeatedly, there is a problem that the processing cost increases.

  The present invention provides a method and apparatus for removing water from an aprotic polar solvent that can solve the above-mentioned conventional problems and can remove water with high accuracy without heating the aprotic polar solvent to a high temperature. The issue is to provide.

  The present invention uses a membrane electrode assembly including a solid electrolyte layer, a first electrode layer provided on one side of the solid electrolyte layer, and a second electrode layer provided on the other side. A method for removing moisture from an aprotic polar solvent, wherein the first electrode layer and the second electrode layer are contacted with each other by applying a voltage to the first electrode layer and the second electrode layer. Oxygen ions are separated from moisture in the protic polar solvent and hydrogen gas is generated, and the hydrogen gas is released from the aprotic polar solvent, while the oxygen ions are released through the solid electrolyte layer through the second electrolyte layer. It is moved to the electrode layer and emitted.

In this invention, the water | moisture content mixed in the aprotic polar solvent is removed using the membrane electrode assembly provided with the solid electrolyte layer and the electrode layer laminated | stacked on this. When a predetermined voltage is applied to the first electrode layer and the second electrode layer using the first electrode layer as an anode electrode in a state where the aprotic polar solvent is in contact with the first electrode layer Electrons are supplied to the water in the aprotic polar solvent. Since the solid electrolyte layer allows oxygen ions to pass therethrough, oxygen ions are separated from moisture and taken into the solid electrolyte layer. On the other hand, the hydrogen component becomes hydrogen gas and is discharged from the aprotic polar solvent.
[Reaction in the first electrode layer]
(1) H ₂ O → H ⁺ + OH ⁻
H ⁺ + OH ⁻ + 2e ⁻ → H ₂ + 1 / 2O ²⁻
or
(2) H ₂ O + 2e ⁻ → H ₂ + 1 / 2O ²⁻
The presence of water in the aprotic polar solvent varies depending on the type of solvent and the water concentration. For example, when the concentration of water is relatively high, it exists in the form of water droplets like an emulsion. On the other hand, at a concentration of 1000 ppm or less, it is dissolved as a molecule in an aprotic polar solvent. Further, when AlCl 3 -EMIC or the like is present, it exists as a compound such as Al—OH—Cl.

  The oxygen ions moved to the second electrode layer are deprived of electrons and become oxygen gas, and are released from the second electrode layer. The second electrode layer can be kept in contact with a liquid or gas capable of releasing the oxygen gas. For example, it may be brought into contact with air or an aqueous solvent.

  As in the invention described in claim 2, the first electrode layer and the first electrode layer so that a voltage higher than the decomposition voltage of water and lower than the decomposition voltage of the aprotic polar solvent acts on the first electrode layer. It is necessary to apply a voltage to the second electrode layer.

  The decomposition voltage of water is a value obtained by adding a theoretical electrolytic voltage (1.23 V), an overvoltage, a liquid electric resistance, and the like, and is usually about 1.5 V. On the other hand, the decomposition voltage of many aprotic polar solvents is 3-5V. Therefore, a voltage is applied to the first electrode layer and the second electrode layer so that a voltage higher than the decomposition voltage of water and lower than the decomposition voltage of the aprotic polar solvent acts. Thereby, water can be decomposed and removed without decomposing the aprotic polar solvent.

  In order to increase the permeability of oxygen ions in the solid electrolyte layer, it is preferable to heat the membrane electrode assembly and the aprotic polar solvent. On the other hand, when the decomposition temperature of the aprotic polar solvent is exceeded, the aprotic polar solvent deteriorates. For this reason, as in the invention described in claim 3, the membrane electrode assembly and the aprotic polar solvent have the oxygen ion permeability of the membrane electrode assembly necessary for removing water to a required concentration. It is preferable to heat to a temperature that can be secured or higher and lower than the decomposition temperature of the aprotic polar solvent.

  The said heating temperature can be set with the kind of employ | adopted solid electrolyte and aprotic polar solvent. For example, when a ceria-based oxide such as GDC (Gadolinium doped Ceria) is employed as the solid electrolyte and an imidazolium salt such as EMIC (1-ethyl-3-methylimidazolium) is employed as the aprotic polar solvent, It is preferable to operate by heating to 180 ° C. In addition to the GDC, lanthanum gallate solid electrolytes such as ScSZ (scandia stabilized zirconia) and LaGaO3 (lanthanum gallate) can be adopted as the solid electrolyte.

According to a fourth aspect of the present invention, an oxygen decomposition catalyst is provided on the first electrode layer. Examples of the oxygen decomposition catalyst include LSCF (lanthanum / strontium / cobalt / iron composite oxide), LSC (lanthanum / strontium / cobalt composite oxide), LSM (lanthanum / strontium / manganese composite oxide), BSCF (barium / Strontium / cobalt / iron composite oxide) can be employed. The oxygen decomposition catalyst can be provided integrally with the electrode layer, or a separate catalyst layer can be provided. For example, a mesh-like catalyst layer coated with the oxygen decomposition catalyst may be provided on the first electrode layer.

  The kind of aprotic polar solvent to which the present invention can be applied and its application are not particularly limited. For example, as in the invention described in claim 5, it can be applied when the aprotic polar solvent is a non-aqueous plating solution.

  Examples of non-aqueous plating solutions include imidazolium salts such as EMIC (1-ethyl-3-methylimidazolium) and BMIC (1-methyl-3-butylimidazolium chloride), alkylbilidinium salts such as BPC (1-butyl-pyridinium chloride), DMSO (dimethylsulfoxide) or the like can be employed.

  The non-aqueous plating solution usually has a decomposition temperature of 200 ° C. or higher, and can be processed by heating to about 200 ° C. Further, in order to increase the water removal efficiency, it is preferable to set the operating temperature high. Therefore, it is preferable to employ a non-aqueous plating solution having a boiling point as high as possible at 200 ° C. or higher.

  Further, as in the invention described in claim 6, it can be applied when the aprotic polar solvent is a battery electrolyte. As the battery electrolyte, an aprotic polar solvent similar to the above plating solution can be employed.

  When the method according to the present invention is employed, it is possible to remove water in the aprotic polar solvent to a concentration of 1 ppm or less.

  In addition, the membrane / electrode assembly according to the present invention is very economical because it can be used repeatedly without using consumables such as zeolite, and the plating cost can be greatly reduced.

  The form of the apparatus used for the above method is not particularly limited. For example, as in the invention described in claim 7, an apparatus for removing moisture from an aprotic polar solvent includes a solid electrolyte layer, a first electrode layer provided on one side of the solid electrolyte layer, and the other side. A membrane electrode assembly having a second electrode layer, a voltage applying means for applying a voltage to the first electrode layer and the second electrode layer, the aprotic polar solvent, and the membrane electrode Heating means for heating the joined body, and separating oxygen ions from moisture in the aprotic polar solvent from the first electrode layer, and the generated oxygen ions through the solid electrolyte layer. It can be configured to move to the second electrode layer for emission.

  The form in which the aprotic polar solvent is brought into contact with the membrane electrode assembly is not particularly limited. For example, a first electrode layer (anode electrode) may be provided along the side wall of a container that contains the aprotic polar solvent, and the second electrode layer may be brought into contact with the atmosphere.

  In addition, a container capable of storing a liquid may be configured by partitioning with an inner wall including the membrane electrode assembly, and storing an aprotic polar solvent on one side and a liquid capable of releasing water or oxygen on the other side. it can.

  Furthermore, while adopting a cylindrical membrane electrode assembly, a first electrode layer (anode electrode) is provided on the inner side and a second electrode layer is provided on the outer peripheral side so that an aprotic polar solvent flows inside. It can also be configured.

  The environment in which the above operation is performed is not particularly limited, and can be performed under a required pressure. Moreover, it can also comprise so that a process may be performed in the container filled with the inert gas.

  According to the eighth aspect of the invention, the voltage applying means acts on the first electrode layer with a voltage that is equal to or higher than the electrolysis voltage of the water molecule and lower than the electrolysis voltage of the aprotic polar solvent. As described above, voltage control means for applying a voltage to the first electrode layer and the second electrode layer is provided.

  The voltage control means performs voltage control so as to apply a voltage capable of removing moisture to a required concentration according to the operating temperature, the type of solid electrolyte, the type of aprotic polar solvent, and the like.

  The invention described in claim 9 is such that the heating means has a temperature higher than a temperature at which oxygen ion permeability of the membrane electrode assembly necessary for removing water to a required concentration can be secured, and the aprotic polarity. The membrane electrode assembly and the temperature control means for heating the aprotic polar solvent are provided at a temperature lower than the decomposition temperature of the solvent. As in the invention described in claim 10, the membrane electrode assembly can include an oxygen decomposition catalyst.

  The aprotic polar solvent to which the present invention is applied and the usage of the aprotic polar solvent are not limited. For example, as in the invention described in claim 11, a non-aqueous plating solution processing apparatus can be configured using an apparatus for removing moisture from an aprotic polar solvent according to the present invention.

  Further, as in the invention described in claim 12, a battery electrolyte treatment apparatus can be configured using an apparatus for removing moisture from the aprotic polar solvent according to the present invention.

  Moisture mixed in aprotic polar solvents such as non-aqueous plating solutions and battery electrolytes can be removed with high accuracy.

It is a figure which shows the outline | summary of the aluminum plating apparatus using a non-aqueous plating liquid. It is sectional drawing which shows the outline | summary of the non-aqueous-plating liquid processing apparatus concerning this invention. It is an expanded sectional view of the principal part of the membrane electrode assembly of the non-aqueous plating solution processing apparatus shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In FIG. 3, the outline | summary of the plating apparatus 200 in the case of performing aluminum non-aqueous plating using an aprotic polar solvent is shown.

  As shown in FIG. 3, the plating tank 207 is filled with a non-aqueous plating solution 208 containing an aprotic polar solvent. As the non-aqueous plating solution 208, an aprotic polar solvent EMIC (1-ethyl-3-methylimidazolium) is employed, and an electrolytic aluminum non-aqueous plating solution 208 in which an aluminum halide is dissolved is prepared and used. .

In order to perform non-aqueous plating, the workpiece 202 for forming a plating film is used as an anode electrode, and an electrode 201 formed from an electrode material containing aluminum is used as a cathode electrode. Pass an electric current through the liquid. As a result, the aluminum ions Al ³⁺ in the non-aqueous plating solution 208 are electrodeposited on the workpiece 202 to form the aluminum plating film 204.

  Usually, in order to remove moisture adhering to the surface of the workpiece 202, pretreatment is performed with dehydrating oil or the like, but moisture cannot be completely removed from the workpiece 202. Since the non-aqueous plating solution is repeatedly used, the amount of water contained in the non-aqueous plating solution increases each time.

  When a plating process is performed using a non-aqueous plating solution mixed with moisture, when electrons are supplied to the aluminum ions from the anode electrode 202 to the moisture, the electrons are also supplied to moisture hydrogen ions to generate hydrogen gas. Is done. Since the hydrogen gas is generated in the form of bubbles, the aluminum ions are prevented from being uniformly deposited on the work surface, and a highly accurate plating layer cannot be formed.

  On the other hand, hydroxide ions are left in the non-aqueous plating solution 208. Since the hydroxide ion has high activity, it reacts with the components constituting the non-aqueous plating solution and degrades the non-aqueous plating solution 208. As a result, there are problems that the number of times the non-aqueous plating solution 208 can be repeatedly used is reduced and the quality of the formed plating layer is lowered.

  After performing the plating process a predetermined number of times or when the amount of water contained in the non-aqueous plating solution exceeds a predetermined value, the non-aqueous plating solution treatment apparatus according to the present embodiment is used. A process of removing moisture is performed.

  As shown in FIG. 1, the non-aqueous plating solution processing apparatus 100 according to this embodiment includes a non-aqueous plating solution treatment tank 7 that can contain the non-aqueous plating solution 8 containing the water, and the non-aqueous plating solution treatment tank 7. (Not shown) partitioning the interior of the substrate, a membrane electrode assembly 110 provided on the partition, voltage applying means 6 for applying a voltage to the membrane electrode assembly 110, the non-aqueous plating solution 8 and the membrane electrode junction And heating means 10 for heating the body 110.

  The membrane electrode assembly 110 includes a solid electrolyte layer 101, a first electrode layer 103 formed on one side of the solid electrolyte layer 101, and a second electrode layer 102 formed on the other side. It is prepared for.

  The membrane electrode assembly 110 is attached to the partition wall with water tightness so that the first electrode layer 103 is in contact with the non-aqueous plating solution. On the other hand, the opposite side of the partition wall is filled with air, and the second electrode layer 102 is disposed so as to be in contact with the air.

  In the present embodiment, an oxygen-permeable solid electrolyte is employed for the solid electrolyte layer 101. Further, it is preferable to configure the membrane electrode assembly 110 that operates at a low temperature so as not to deteriorate the non-aqueous plating solution 8. For example, the membrane electrode assembly 110 using a material such as SCSZ (scandia stabilized zirconia) or GDC (Gadolinium doped Ceria), which operates at 200 ° C. or less, for the solid electrolyte layer 101 can be employed. The thickness of the solid electrolyte layer 101 is preferably set to 0.01 μm to 1 μm. When the thickness is 0.01 μm or less, it is difficult to form a film, while when the thickness is 1 μm or more, the ion transmission resistance increases.

  Further, as the first electrode layer 103, one that functions as an oxygen decomposition catalyst can be employed. For example, LSCF (lanthanum / strontium / cobalt / iron complex oxide), LSC (lanthanum / strontium / cobalt complex oxide), LSM (lanthanum / strontium / manganese complex oxide), BSCF (barium / strontium / cobalt / iron complex oxide) Oxide) can be employed. Note that the oxygen decomposition catalyst can be separately formed on an electrode layer made of another material.

  On the other hand, as the second electrode layer 102, a porous sintered body formed of nickel, silver or the like can be used.

  FIG. 2 shows a partially enlarged view of the membrane electrode assembly 110. As shown in this figure, a porous current collector 112 for applying a voltage to the non-aqueous plating solution 8 brought into contact with the surface of the first electrode layer 103 is formed on the surface of the first electrode layer 103. Is provided. The porous current collector 102 is formed, for example, by bonding a nickel mesh material having an Ag layer provided on the surface thereof to the first electrode layer 103 with a silver paste. On the other hand, it can be provided to facilitate the exchange of electrons. A current collector 111 is similarly provided on the surface of the second electrode layer.

  The voltage so that a voltage equal to or higher than the decomposition voltage of water acts on the non-aqueous plating solution 8 between the first electrode layer 103 and the second electrode layer 102 of the membrane electrode assembly 110 configured as described above. Apply. A voltage control means 11 for controlling the applied voltage is provided in the circuit of the voltage application means 6 so that a voltage is applied according to the type of the non-aqueous plating solution 8 and the membrane electrode assembly 110. It is configured.

  In addition, when a voltage higher than the decomposition voltage of the non-aqueous plating solution 8 is applied, the non-aqueous plating solution 8 is decomposed and deteriorates. Therefore, the applied voltage is smaller than the decomposition voltage of the non-aqueous plating solution 8. As described above, the voltage control unit 11 controls the voltage. In the present embodiment, a voltage in the range of 2V to 20V is applied between the first electrode layer 103 and the second electrode layer 102 so that the voltage is generated in the first electrode layer 103.

  The heating means 10 is provided in the treatment tank 7 filled with the non-aqueous plating solution 8 and heats the membrane electrode assembly 110 and the non-aqueous plating solution 8 to a predetermined temperature. The heating temperature is set according to the membrane electrode assembly 110 and the non-aqueous plating solution 8 employed, and is a temperature that is at least lower than the decomposition temperature of the non-aqueous plating solution and can remove moisture to a predetermined concentration. Set to The heating means 10 is controlled by a temperature control means 12 having a sensor (not shown). In the present embodiment, the membrane electrode assembly 110 and the non-aqueous plating solution 8 are heated to about 180 ° C. to perform a moisture removal process.

  A circulation device 13 for circulating the non-aqueous plating solution 8 is provided in the treatment tank 7 filled with the non-aqueous plating solution 8 so that the non-aqueous plating solution 8 can efficiently act on the first electrode layer 103. Is preferred.

  The operation of the non-aqueous plating solution processing apparatus 100 described above will be described.

When a voltage is applied to the first electrode layer 103 and the second electrode layer 102 under the above conditions, electrons are supplied to moisture in the vicinity of the first electrode layer 103. The moisture exists in a state of being ionized in the non-aqueous plating solution 8. By supplying electrons to the hydrogen ions, hydrogen gas is generated and discharged from the non-aqueous plating solution 8.
(Reaction in the first electrode layer)
(1) H ₂ O → H ⁺ + OH ⁻
H ⁺ + OH ⁻ + 2e ⁻ → H ₂ + 1 / 2O ²⁻
or
(2) H ₂ O + 2e ⁻ → H ₂ + 1 / 2O ²⁻
The presence of water in the aprotic polar solvent varies depending on the type of solvent and the water concentration. For example, when the concentration of water is relatively high, it exists in the form of water droplets like an emulsion. On the other hand, at a concentration of 1000 ppm or less, it is dissolved as a molecule in an aprotic polar solvent. Further, when AlCl 3 -EMIC or the like is present, it exists as a compound such as Al—OH—Cl.

  On the other hand, in the present embodiment, an oxygen ion permeable solid electrolyte is used for the solid electrolyte layer 101 of the membrane electrode assembly 110, and a voltage higher than the electrolysis voltage of water acts. Thus, when electrons are supplied from the first electrode layer 103 to the hydroxide ions, oxygen ions and hydrogen gas are generated. The oxygen ions are moved toward the second electrode layer 102 in the membrane electrode assembly 110. The hydrogen gas is discharged from the non-aqueous plating solution 8.

On the other hand, oxygen ions that have reached the second electrode layer 102 are deprived of electrons and become oxygen gas, and are discharged into the air 9 as gas.
(Reaction in the second electrode layer)
1 / 2O ^{2 −} −e ⁻ → O ₂

  In the non-aqueous plating solution processing apparatus 100 in the present embodiment, moisture in the non-aqueous plating solution 8 can be removed using a solid electrolyte used for a fuel cell or the like. For this reason, it is possible to remove moisture with high accuracy that cannot be considered by the conventional method. For example, when a non-aqueous plating solution having a water content of 1000 ppm is treated under the above conditions for 5 hours, the water content can be reduced to 1 ppm.

  Moreover, since the non-aqueous plating solution processing apparatus 100 according to the present embodiment does not need to use consumables such as zeolite, the processing cost can be greatly reduced.

  Furthermore, it is not necessary to mix chemicals or the like into the non-aqueous plating solution 8, and since the treatment is performed at a voltage and temperature below the decomposition temperature, the non-aqueous plating solution is hardly degraded.

  In the embodiment described above, the non-aqueous plating solution processing apparatus is configured by using the method for removing moisture of the aprotic polar solvent according to the present invention. However, the electrolytic solution using the aprotic polar solvent for the battery is used. The present invention can be applied to an apparatus for removing moisture from the water.

  In the present embodiment, the treatment layer is filled with the non-aqueous plating solution, but the membrane electrode assembly is formed in a cylindrical shape, and the treatment is performed by flowing the non-aqueous plating in the cylinder. You can also.

  The scope of the present invention is not limited to the embodiment described above. The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  Water can be removed with high accuracy from an electrolytic solution using an aprotic polar solvent such as a non-aqueous plating solution, and the performance of these electrolytic solutions can be enhanced.

7 Treatment layer 8 Non-aqueous plating solution (aprotic polar solvent)
6 Voltage application means 10 Heating means 11 Voltage control means 12 Temperature control means 100 Non-aqueous plating solution processing apparatus 101 Solid electrolyte layer 102 Second electrode layer 103 First electrode layer 110 Membrane electrode assembly

Claims (12)

A non-conducting membrane electrode assembly comprising a solid electrolyte layer, a first electrode layer provided on one side of the solid electrolyte layer, and a second electrode layer provided on the other side; A method of removing moisture from a protic polar solvent,
By applying a voltage to the first electrode layer and the second electrode layer,
Separating oxygen ions from water in the aprotic polar solvent brought into contact with the first electrode layer and generating hydrogen gas;
A method for removing water from an aprotic polar solvent, wherein the hydrogen gas is released from the aprotic polar solvent, and the oxygen ions are moved to the second electrode layer through the solid electrolyte layer and released. .   A voltage is applied to the first electrode layer and the second electrode layer so that a voltage higher than the decomposition voltage of water and lower than the decomposition voltage of the aprotic polar solvent acts on the first electrode layer. A method for removing water from the aprotic polar solvent according to claim 1.   The membrane electrode assembly and the aprotic polar solvent have a temperature higher than the temperature at which oxygen ion permeability of the membrane electrode assembly necessary for removing water to a required concentration can be secured, and the aprotic polar solvent. The method for removing moisture from the aprotic polar solvent according to claim 1, wherein the method is carried out by heating to a temperature lower than the decomposition temperature.   The method for removing moisture from the aprotic polar solvent according to any one of claims 1 to 3, wherein an oxygen decomposition catalyst is provided in the first electrode layer.   The method for removing moisture from an aprotic polar solvent according to any one of claims 1 to 4, wherein the aprotic polar solvent is a non-aqueous plating solution.   The method for removing moisture from an aprotic polar solvent according to any one of claims 1 to 4, wherein the aprotic polar solvent is an electrolytic solution for a battery. An apparatus for removing moisture from an aprotic polar solvent,
A membrane electrode assembly having a solid electrolyte layer, a first electrode layer provided on one side of the solid electrolyte layer, and a second electrode layer provided on the other side;
Voltage applying means for applying a voltage to the first electrode layer and the second electrode layer;
A heating means for heating the aprotic polar solvent and the membrane electrode assembly,
Separating oxygen ions from moisture in the aprotic polar solvent from the first electrode layer;
An apparatus for removing moisture from an aprotic polar solvent configured to move and release the generated oxygen ions to the second electrode layer through the solid electrolyte layer.   The voltage applying means is configured to apply a voltage higher than the electrolysis voltage of the water molecule and smaller than the electrolysis voltage of the aprotic polar solvent to the first electrode layer. And an apparatus for removing moisture from the aprotic polar solvent according to claim 7, comprising voltage control means for applying a voltage to the second electrode layer.   The heating means is at or above a temperature at which oxygen ion permeability of the membrane electrode assembly necessary for removing water to a required concentration can be ensured, and at a temperature lower than the decomposition temperature of the aprotic polar solvent, The apparatus which removes a water | moisture content from the aprotic polar solvent of Claim 7 or Claim 8 provided with the temperature control means to heat the said membrane electrode assembly and the said aprotic polar solvent.   The apparatus for removing moisture from an aprotic polar solvent according to any one of claims 7 to 9, wherein the membrane electrode assembly is configured to contain an oxygen decomposition catalyst.   The non-aqueous plating solution processing apparatus comprised using the apparatus which removes a water | moisture content from the aprotic polar solvent described in any one of Claims 7-10.   The battery electrolyte solution processing apparatus comprised using the apparatus which removes a water | moisture content from the aprotic polar solvent described in any one of Claims 7-10.

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