JP2016122597A - battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery arranged so that charge and discharge performances can be prevented from being degraded owing to the precipitation of an active material.SOLUTION: According to the present invention, the above problem is solved by providing a battery which comprises: a positive electrode-side slurry enclosed in a positive electrode chamber; a negative electrode-side slurry enclosed in a negative electrode chamber; and a separator defining the positive and negative electrode chambers. The positive electrode-side slurry contains a positive electrode active material of a nano size, and a positive electrode-side electrolytic solution; the particle diameter of the positive electrode active material, and the viscosity of the positive electrode-side slurry are adjusted so that the positive electrode active material can be kept in the state of being dispersed. The negative electrode-side slurry contains a negative electrode active material of a nano size, and a negative electrode-side electrolytic solution; the particle diameter of the negative electrode active material and the viscosity of the negative electrode-side slurry are adjusted so that the negative electrode active material can be kept in the state of being dispersed. The separator has an ion conductivity, and the positive electrode-side electrolytic solution and the negative electrode-side electrolytic solution cannot go through the separator.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery that can prevent deterioration of charge / discharge performance due to precipitation of an active material.

  Conventionally, a battery using a slurry containing an active material as an electrode is known. For example, in Patent Document 1, a first electrode compartment containing a first electrochemically active fluid, a second electrode compartment containing a second electrochemically active fluid, and both electrodes An electrochemical cell is disclosed having an ion exchange medium provided between the compartments. The electrochemical cell is such that, during operation, no electrochemically active fluid is transferred out of the electrode compartment, or less than about 20% by weight of the electrochemically active fluid is in the electrode compartment. It is comprised so that it may be transferred outside.

  Patent Document 2 discloses a lithium ion conductive solid electrolyte membrane that separates the inside of a case into a positive electrode chamber and a negative electrode chamber, and a positive electrode slurry that is accommodated in the positive electrode chamber and in which the positive electrode active material is dispersed in a non-aqueous electrolyte. And a negative electrode slurry that is accommodated in a negative electrode chamber and in which a negative electrode active material is dispersed in a nonaqueous electrolytic solution. This technique is intended to make use of the advantages of the lithium secondary battery, and to make it difficult to cause unevenness of the battery reaction so as not to cause structural deterioration of the electrode.

Special table 2013-535801 gazette JP 2009-224141 A

  When a slurry containing an active material is used as an electrode, if there is no circulation of the electrolyte between the positive and negative electrodes or the circulation of the electrolyte between the inside and outside of the battery, the active material is precipitated and charge / discharge performance May be difficult to maintain. This invention is made | formed in view of the said situation, and it aims at providing the battery which can prevent the fall of the charging / discharging performance by precipitation of an active material.

  In order to solve the above problems, in the present invention, a battery comprising a positive electrode side slurry accommodated in a positive electrode chamber, a negative electrode side slurry accommodated in a negative electrode chamber, and a separator that partitions the positive electrode chamber and the negative electrode chamber. The positive electrode-side slurry contains a nano-sized positive electrode active material and a positive electrode-side electrolyte, and the positive electrode active material has a particle size and a positive electrode so that the positive electrode active material maintains a dispersed state. The negative electrode side slurry is adjusted so that the negative electrode side slurry contains a nano-sized negative electrode active material and a negative electrode side electrolyte, and the negative electrode active material is maintained in a dispersed state. The separator has a ionic conductivity, and the positive electrode side electrolyte solution and the negative electrode side electrolyte solution are non-permeable. To provide a battery to be.

  According to the present invention, the particle size of the active material and the viscosity of the slurry are adjusted so that each of the positive electrode side slurry and the negative electrode side slurry maintains a dispersed state. Since it does not permeate, it can be set as the battery which prevented the fall of the charge / discharge performance by precipitation of an active material.

In the said invention, it is preferable that the sedimentation velocity V of the said positive electrode active material calculated by the following formula and the said negative electrode active material is 1.65 * 10 < ^-4 > cm / s or less, respectively.
Sedimentation velocity V = (ρ−ρ ₀ ) gr ² / 18η
(Ρ is the density of the active material, ρ ₀ is the density of the solvent, r is the particle size of the active material, g is the acceleration of gravity, and η is the viscosity of the slurry)

  In the said invention, it is preferable to provide the variable structure in which the volume of the said positive electrode chamber and the said negative electrode chamber changes according to the volume change of the said positive electrode active material and said negative electrode active material in charging / discharging.

  In the above invention, the variable structure is preferably a piston structure in which at least one of the positive electrode current collector and the negative electrode current collector is movable in the thickness direction of the battery.

  In the above invention, the variable structure is preferably a structure in which the separator has flexibility.

  The battery of the present invention has an effect of preventing a decrease in charge / discharge performance due to precipitation of the active material.

It is a schematic sectional drawing which shows an example of the battery of this invention. It is a schematic sectional drawing which shows the other example of the battery of this invention. It is the schematic perspective view which decomposed | disassembled the battery shown in FIG. It is a schematic sectional drawing which shows the other example of the battery of this invention. It is a schematic sectional drawing which shows the other example of the battery of this invention.

  Hereinafter, the battery of the present invention will be described in detail.

  FIG. 1 is a schematic cross-sectional view showing an example of the battery of the present invention. The battery 20 in FIG. 1 includes a positive electrode side slurry 3 accommodated in the positive electrode chamber 11, a negative electrode side slurry 6 accommodated in the negative electrode chamber 12, and a separator 7 that partitions the positive electrode chamber 11 and the negative electrode chamber 12. The positive electrode side slurry 3 contains the nano-sized positive electrode active material 1 and the positive electrode side electrolyte solution 2, and the particle size of the positive electrode active material 1 and the positive electrode side slurry so that the positive electrode active material 1 maintains a dispersed state. The viscosity of 3 is adjusted. Similarly, the negative electrode side slurry 6 contains the nano-sized negative electrode active material 4 and the negative electrode side electrolyte solution 5, and the negative electrode active material 4 has a particle size and a negative electrode so that the negative electrode active material 4 maintains a dispersed state. The viscosity of the side slurry 6 is adjusted. The separator 7 has ion conductivity and has a property of not allowing the positive electrode side electrolyte 2 and the negative electrode side electrolyte 5 to permeate.

  According to the present invention, the particle size of the active material and the viscosity of the slurry are adjusted so that each of the positive electrode side slurry and the negative electrode side slurry maintains a dispersed state. Since it does not permeate, it can be set as the battery which prevented the fall of charge / discharge performance by precipitation of an active material.

  As described above, when a slurry containing an active material is used as an electrode, the active material is precipitated if there is no circulation of the electrolyte between the positive electrode and the negative electrode or circulation of the electrolyte between the inside and outside of the battery. However, it may be difficult to maintain charge / discharge performance. On the other hand, the slurry in the present invention is adjusted in the particle size of the active material and the viscosity of the slurry so that the active material maintains a dispersed state. Can be maintained. Moreover, the slurry in the present invention adjusts the dispersion state of the active material based on the viscosity of the slurry. When the slurry viscosity changes, the dispersion state of the active material also changes, making it difficult to manage the dispersion state. However, since the separator in the present invention does not allow electrolyte to permeate, the slurry viscosity does not change and the active material does not change. Is maintained in a distributed state. Therefore, there is an advantage that the distributed state can be easily managed. As described above, in the present invention, by adopting an integral indivisible configuration of a slurry whose viscosity is adjusted so that the active material is maintained in a dispersed state and a separator that does not allow electrolyte to permeate, charging by precipitation of the active material is performed. A decrease in discharge performance can be prevented.

In addition, since the slurry in the present invention has the particle size of the active material and the viscosity of the slurry adjusted so that the active material maintains a dispersed state, the electrolyte solution is circulated between the positive electrode and the negative electrode, the inside of the battery, and the battery The circulation of the electrolyte between the outside is basically unnecessary. Therefore, there is an advantage that the battery can be easily downsized. Further, in the conventional battery in which the active material is fixed in the electrode, when the active material expands and contracts during charging and discharging, the electrode may crack, and the ion conduction path and the electron conduction path may be interrupted. In particular, in an active material that easily expands and contracts, the conduction path is significantly interrupted. On the other hand, a battery in which the active material is not fixed in the electrode (a battery in which the active material flows in the electrode) has an advantage that the conduction path is not interrupted due to the crack of the electrode.
Hereinafter, the battery of this invention is demonstrated for every structure.

1. Positive electrode side slurry In the positive electrode side slurry in the present invention, the particle size of the positive electrode active material and the viscosity of the positive electrode side slurry are adjusted so that the positive electrode active material maintains a dispersed state. “The positive electrode active material maintains a dispersed state” means that when the battery is left to stand for one week, the positive electrode active material is dispersed to such an extent that a decrease in charge / discharge performance due to precipitation of the positive electrode active material is not observed before and after standing. The state that has been done.

“Maintaining a dispersed state of the positive electrode active material” can be defined by, for example, the sedimentation rate V of the positive electrode active material in the positive electrode side slurry. The following formula corresponds to the terminal sedimentation rate formula.
Sedimentation velocity V = (ρ−ρ ₀ ) gr ² / 18η
(Ρ is the density of the active material, ρ ₀ is the density of the solvent, r is the particle size of the active material, g is the acceleration of gravity, and η is the viscosity of the slurry)

The sedimentation rate V of the positive electrode active material is preferably 1.65 × 10 ⁻⁴ cm / s or less, for example. 1.65 × 10 ⁻⁴ cm / s corresponds to a sedimentation of 100 cm in one week (6.048 × 10 ⁵ seconds). Thus, if the sedimentation rate is extremely small, precipitation of the positive electrode active material can be prevented by thermal diffusion due to heat generated by normal charge / discharge. Also, in terms of practical use, for example, the dispersion state of the positive electrode active material is maintained by car vibration or the like. In the present invention, a viscosity adjusting material that adjusts the viscosity of the slurry may be used.

The positive electrode side slurry contains a nano-sized positive electrode active material. “Nanosize” means that the average particle diameter (D ₅₀ ) of the positive electrode active material is 1 μm or less. The average particle diameter (D ₅₀ ) of the positive electrode active material is more preferably 500 nm or less, for example.

Although the kind of positive electrode active material is not specifically limited, For example, an oxide active material can be mentioned. Examples of the oxide active material used in the lithium battery include rock salt layer type active materials such as LiCoO ₂ , LiMnO ₂ , LiNiO ₂ , LiVO ₂ , LiNi _1/3 Co _1/3 Mn _1/3 O ₂ , and LiMn _2. Examples include spinel active materials such as O ₄ and Li (Ni _0.5 Mn _1.5 ) O ₄ , and olivine active materials such as LiFePO ₄ , LiMnPO ₄ , LiNiPO ₄ , and LiCuPO ₄ .

The positive electrode side slurry contains a positive electrode side electrolyte. The positive electrode side electrolyte solution is not particularly limited as long as it is a liquid having ion conductivity. The positive electrode side electrolyte contains, for example, a supporting salt and a solvent. Examples of the supporting salt include metal salts. Examples of the supporting salt used in the lithium battery include inorganic lithium salts such as LiPF ₆ , LiBF ₄ , LiClO ₄ , LiAsF ₆ , LiCF ₃ SO ₃ , LiN (CF ₃ SO ₂ ) ₂ , LiN (C ₂ F ₅ And organic lithium salts such as SO ₂ ) ₂ and LiC (CF ₃ SO ₂ ) ₃ .

  The solvent of the positive electrode side electrolyte may be water or a non-aqueous solvent. The non-aqueous solvent is preferably an aprotic solvent. Specifically, ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC) , Butylene carbonate (BC), γ-butyrolactone, sulfolane, acetonitrile, 1,2-dimethoxymethane, 1,3-dimethoxypropane, diethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran and any mixture thereof. . In addition, you may use an ionic liquid as a solvent of a positive electrode side electrolyte solution. The concentration of the supporting salt in the positive electrode side electrolyte is, for example, in the range of 0.5 mol / L to 3 mol / L.

  The positive electrode side slurry contains at least a positive electrode active material and a positive electrode side electrolytic solution, but may further contain a conductive material. Examples of the conductive material include carbon materials such as acetylene black, ketjen black, VGCF, and graphite.

  The solid content concentration of the positive electrode side slurry is not particularly limited, but is, for example, in the range of 10 wt% to 90 wt%, and preferably in the range of 20 wt% to 80 wt%.

2. Negative electrode side slurry The negative electrode side slurry in this invention contains a nanosized negative electrode active material. Although the kind of negative electrode active material is not specifically limited, For example, a metal active material and a carbon active material can be mentioned. Examples of the metal active material include In, Al, Si, and Sn. On the other hand, examples of the carbon active material include mesocarbon microbeads (MCMB), highly oriented graphite (HOPG), hard carbon, and soft carbon. In addition, since other matters, such as the average particle diameter of a negative electrode active material and the kind of negative electrode side electrolyte solution, are the same as that of the positive electrode side slurry mentioned above, description here is abbreviate | omitted.

  Moreover, the positive electrode side electrolyte solution in the positive electrode side slurry and the negative electrode side electrolyte solution in the negative electrode side slurry may be the same or different. In the latter case, it is preferable to satisfy at least one of different types of the supporting salt, different concentrations of the supporting salt, and different types of solvent.

3. Separator The separator in the present invention has ionic conductivity, and the positive electrode side electrolyte solution and the negative electrode side electrolyte solution are impermeable. As described above, in the positive electrode side slurry and the negative electrode side slurry, the particle size of the active material and the viscosity of the slurry are adjusted so that the active material maintains a dispersed state. When passing through the separator, the viscosity of the slurry changes, making it difficult to maintain the dispersed state. Therefore, in order to maintain the viscosity of the slurry, the separator is required to have a property of not allowing the positive electrode side electrolyte solution and the negative electrode side electrolyte solution to permeate. In addition, since a separator is a member which divides a positive electrode chamber and a negative electrode chamber, naturally, it has a property which does not permeate | transmit a positive electrode active material and a negative electrode active material.

Although the kind of separator is not specifically limited, Usually, a solid electrolyte material is contained. As an example of the separator, a separator composed of an inorganic solid electrolyte material can be given. Examples of the inorganic solid electrolyte material include an oxide solid electrolyte material and a sulfide solid electrolyte material. Examples of the oxide solid electrolyte material having Li ion conductivity include Li-La-Ti-O-based materials (for example, Li _0.5 La _0.5 TiO ₃ ), Li-Zn-Ge-O-based materials ( For example, Li ₁₄ Zn (GeO ₄ ) ₄ ), Li—Si—O based material (for example, Li ₄ SiO ₄ ), Li—Ge—O based material (for example, Li ₄ GeO ₄ ), Li _{1 + x} Al _x Ge _{2 -x (PO 4) 3 (0} ≦ x ≦ 2), Li 1 + x Al x Ti 2-x (PO 4) 3 (0 ≦ x ≦ 2), Li-La-Zr-O -based material (e.g., Li ₇ La ₃ Zr ₂ O ₁₂ ), Li—P—O—N-based materials (for example, Li _2.9 PO _3.3 N _0.46 ) and the like can be given.

Examples of the sulfide solid electrolyte material having Li ion conductivity include Li ₂ S—P ₂ S ₅ , Li ₂ S—P ₂ S ₅ —LiI, Li ₂ S—P ₂ S ₅ —Li ₂ O, Li _{2 S-P 2 S 5 -Li} 2 O-LiI, Li 2 S-SiS 2, Li 2 S-SiS 2 -LiI, Li 2 S-SiS 2 -B 2 S 3 -LiI, Li 2 S-SiS 2 _{-P 2 S 5 -LiI, Li 2} S-B 2 S 3, Li 2 S-P 2 S 5 -Z m S n ( however, m, n is the number of positive .Z is, Ge, Zn, and Ga _{either.), Li 2 S-GeS} 2, Li 2 S-SiS 2 -Li 3 PO 4, Li 2 S-SiS 2 -Li x MO y ( provided that, x, y is a positive number .M is, P , Si, Ge, Al, or B). The description of “Li ₂ S—P ₂ S ₅ ” means a sulfide solid electrolyte using a raw material composition containing Li ₂ S and P ₂ S _5, and the same applies to other descriptions. . The sulfide solid electrolyte material may be a Li—PS—S material (including a Li—P—Ge—S material), a Li—Ge—S material, or a Li—Si—S material. preferable.

  The inorganic solid electrolyte material may be an amorphous material or a crystalline material. Examples of the amorphous material include glass such as oxide glass, and examples of the crystalline material include crystallized glass (glass ceramics) such as crystallized oxide glass, and a sintered body. be able to.

  The separator may be composed only of an inorganic solid electrolyte material, and may further contain a polymer. Examples of the polymer used together with the inorganic solid electrolyte material include a fluorine-based polymer and rubber. An example of the fluorine-based polymer is PVDF. Examples of the rubber include diene rubbers such as SBR.

  Moreover, the separator comprised from a polymer solid electrolyte material can be mentioned as another example of a separator. The polymer solid electrolyte material may be a gel electrolyte material obtained by adding a polymer to an electrolytic solution, or may be an intrinsic polymer electrolyte material in which the polymer itself has ion conductivity. Examples of the polymer that gels the electrolyte include polyethylene oxide (PEO), polyacrylonitrile (PAN), and polymethyl methacrylate (PMMA).

  Moreover, it is preferable that the separator in this invention has the compactness which does not permeate | transmit a positive electrode side electrolyte solution and a negative electrode side electrolyte solution. In particular, the separator preferably does not have a through hole in the thickness direction. The filling factor of the separator is, for example, 95% or more, and more preferably 99% or more. Moreover, it is preferable that the separator in this invention has the thickness which does not permeate | transmit a positive electrode side electrolyte solution and a negative electrode side electrolyte solution. The thickness of the separator is, for example, 1 μm or more, and preferably 10 μm or more. On the other hand, the thickness of a separator is 1000 micrometers or less, for example, and it is preferable that it is 500 micrometers or less.

4). Other Configurations The battery of the present invention usually has a positive electrode current collector that collects current from the positive electrode side slurry and a negative electrode current collector that collects current from the negative electrode side slurry. Examples of the material for the positive electrode current collector include SUS, aluminum, nickel, iron, titanium, and carbon. On the other hand, examples of the material for the negative electrode current collector include SUS, copper, nickel, and carbon. In the present invention, a positive electrode current collector may be provided inside the positive electrode chamber (for example, in contact with the inner wall of the positive electrode chamber), and the positive electrode current collector may be used together with the battery case as a component of the positive electrode chamber. Alternatively, a necessary insulation treatment may be performed on the battery case, and a part of the battery case may be used as the positive electrode current collector. The same applies to the negative electrode current collector. In addition, the material of the battery case used for this invention should just be a general material, for example, SUS etc. can be mentioned.

5). Battery The battery of the present invention includes a positive electrode chamber, a negative electrode chamber, and a separator that partitions the positive electrode chamber and the negative electrode chamber. Especially, it is preferable that the battery of this invention is equipped with the variable structure from which the volume of a positive electrode chamber and a negative electrode chamber changes according to the volume change of the positive electrode active material and negative electrode active material in charging / discharging. As described above, the separator in the present invention has the property of not allowing the positive electrode side electrolyte and the negative electrode side electrolyte to permeate. Therefore, there is a specific problem that a large stress is generated in the positive electrode chamber and the negative electrode chamber due to the volume change (expansion and contraction) of the positive electrode active material and the negative electrode active material in charge and discharge. Therefore, in order to relieve the stress, it is preferable to provide a variable structure in which the volumes of the positive electrode chamber and the negative electrode chamber change.

  In the case where no variable structure is provided, it is possible to provide voids (regions not filled with slurry) inside the battery in order to reduce the influence of expansion and contraction of the positive electrode active material and the negative electrode active material. In this case, there is a problem that the energy density of the battery is lowered. On the other hand, by providing the variable structure, it is not necessary to provide a gap inside the battery, and the energy density of the battery can be improved.

  An example of the variable structure is a piston structure in which at least one of the positive electrode current collector and the negative electrode current collector can move in the thickness direction of the battery. Here, in FIG. 2A, the positive electrode chamber 11 is composed of an insulating member 33, which is a battery case, a separator 7, and a positive electrode current collector 31, and the negative electrode chamber 12 is a battery case. The insulating member 33, the separator 7, and the negative electrode current collector 32 are configured. When the battery shown in FIG. 2A is charged, the metal ions contained in the positive electrode active material 1 move to the negative electrode active material 4 through the separator 7.

As a result, as shown in FIG. 2B, the positive electrode active material 1 contracts and the negative electrode active material 1 expands. In FIG. 2B, since the positive electrode current collector 31 and the negative electrode current collector 32 have a piston structure that can move in the battery thickness direction _DT , the volume of the positive electrode chamber 11 is reduced, and the volume of the negative electrode chamber 12 is reduced. Becomes larger. Note that when the battery shown in FIG. 2B is discharged, the state shown in FIG. FIG. 3 is an exploded perspective view of the battery shown in FIG. In FIG. 3, the separator 7 is fixed by sandwiching the separator 7 between the insulating member 33a on the positive electrode side and the insulating member 33b on the negative electrode side. Furthermore, the positive electrode current collector 31 is disposed so as to fit in the hollow portion of the insulating member 33a, and the negative electrode current collector 32 is disposed so as to fit in the hollow portion of the insulating member 33b.

  Another example of the variable structure is a structure in which the separator has flexibility. Here, in FIG. 4A, the positive electrode chamber 11 includes a positive electrode current collector 31 and an insulating member 33 that are battery cases, and a separator 7, and the negative electrode chamber 12 is a negative electrode that is a battery case. The current collector 32 and the insulating member 33 and the separator 7 are included. In other words, the battery case on the positive electrode side and the battery case on the negative electrode side are stacked via the insulating member 33, so that the battery case on the positive electrode side and the battery case on the negative electrode side are respectively connected to the positive electrode current collector 31 and the negative electrode current collector. It is used as the electric body 32. Furthermore, the separator 7 has flexibility. When the battery shown in FIG. 4A is charged, metal ions contained in the positive electrode active material 1 move to the negative electrode active material 4 through the separator 7.

  As a result, as shown in FIG. 4B, the positive electrode active material 1 contracts and the negative electrode active material 4 expands. In FIG. 4B, since the separator 7 has flexibility, the separator 7 bends to the positive electrode side, the volume of the positive electrode chamber 11 decreases, and the volume of the negative electrode chamber 12 increases. Note that when the battery shown in FIG. 4B is discharged, the state shown in FIG. An example of the flexible separator is a separator containing a polymer. Specific examples include a separator composed of a polymer solid electrolyte material, a separator composed of an inorganic solid electrolyte material and a polymer, and the like. Although the Young's modulus of a separator is not specifically limited, For example, it exists in the range of 0.001GPa-10GPa, and it is preferable to exist in the range of 0.01GPa-5GPa.

  In FIG. 5A, the positive electrode chamber 11 includes a positive electrode current collector 31 that is a battery case and a separator 7, and the negative electrode chamber 12 is a partial inner wall of the positive electrode current collector 31. It is comprised from the insulation member 33 which insulated-processed, the separator 7, and the negative electrode electrical power collector 32. FIG. Furthermore, the separator 7 has flexibility. When the battery shown in FIG. 5A is charged, the metal ions contained in the positive electrode active material 1 move to the negative electrode active material 4 through the separator 7.

As a result, as shown in FIG. 5B, the positive electrode active material 1 contracts and the negative electrode active material 4 expands. In FIG. 5B, the negative electrode current collector 32 has a piston structure that can move in the battery thickness direction _DT . Further, since the separator 7 has flexibility, the separator 7 bends to the positive electrode side. Therefore, the volume of the positive electrode chamber 11 is reduced, and the volume of the negative electrode chamber 12 is increased. Note that when the battery shown in FIG. 5B is discharged, the state shown in FIG. FIG. 5 shows a mode in which the negative electrode current collector 32 has a piston structure and the positive electrode current collector 31 does not have a piston structure, but the positive electrode current collector 31 has a piston structure and the negative electrode current collector 32 has a piston structure. It may be an aspect that is not a structure, and may be an aspect in which both the positive electrode current collector 31 and the negative electrode current collector 32 have a piston structure. Although not shown, other examples of the variable structure include a structure in which the battery case has flexibility.

  Further, as described above, in the positive electrode-side slurry in the present invention, the particle size of the positive electrode active material and the viscosity of the positive electrode-side slurry are adjusted so that the positive electrode active material is maintained in a dispersed state. Therefore, it is preferable that a stirring device for mechanically stirring the positive electrode side slurry is not disposed in the positive electrode chamber. Similarly, the positive electrode chamber is preferably not connected to a circulation device (external circulation device) for circulating the positive electrode side slurry. The same applies to the negative electrode chamber, and it is preferable that no stirring device is disposed, and it is preferable that the negative electrode chamber is not connected to the circulation device.

  In the battery of the present invention, ions move between the positive electrode active material and the negative electrode active material via the separator. The ions are preferably metal ions. Although the kind of metal ion is not specifically limited, For example, Li ion, Na ion, Mg ion, Ca ion, Al ion etc. can be mentioned. The ions may be H ions. In addition, the battery of the present invention may be a primary battery or a secondary battery, but among them, a secondary battery is preferable. This is because it can be repeatedly charged and discharged and is useful, for example, as an in-vehicle battery. The primary battery includes primary battery use (use for the purpose of discharging only once after charging). Examples of the shape of the battery include a coin shape, a laminate shape, a cylindrical shape, and a square shape.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

DESCRIPTION OF SYMBOLS 1 ... Positive electrode active material 2 ... Positive electrode side electrolyte 3 ... Positive electrode side slurry 4 ... Negative electrode active material 5 ... Negative electrode side electrolyte 6 ... Negative electrode side slurry 7 ... Separator 10 ... Battery case 11 ... Positive electrode chamber 12 ... Negative electrode chamber 20 ... Battery

Claims (5)

A battery comprising a positive electrode side slurry accommodated in a positive electrode chamber, a negative electrode side slurry accommodated in a negative electrode chamber, and a separator that partitions the positive electrode chamber and the negative electrode chamber,
The positive electrode side slurry contains a nano-sized positive electrode active material and a positive electrode side electrolyte, and the particle size of the positive electrode active material and the viscosity of the positive electrode side slurry so that the positive electrode active material maintains a dispersed state. Has been adjusted,
The negative electrode-side slurry contains a nano-sized negative electrode active material and a negative electrode-side electrolyte, and the particle size of the negative electrode active material and the viscosity of the negative electrode-side slurry so that the negative electrode active material maintains a dispersed state. Has been adjusted,
The battery is characterized in that the separator has ion conductivity and the positive electrode side electrolyte and the negative electrode side electrolyte are impermeable. 2. The battery according to claim 1, wherein sedimentation rates V of the positive electrode active material and the negative electrode active material calculated by the following formula are each 1.65 × 10 ⁻⁴ cm / s or less.
Sedimentation velocity V = (ρ−ρ ₀ ) gr ² / 18η
(Ρ is the density of the active material, ρ ₀ is the density of the solvent, r is the particle size of the active material, g is the acceleration of gravity, and η is the viscosity of the slurry)   The variable structure according to claim 1 or 2, further comprising a variable structure in which volumes of the positive electrode chamber and the negative electrode chamber change in accordance with a volume change of the positive electrode active material and the negative electrode active material in charge / discharge. battery.   The battery according to claim 3, wherein the variable structure is a piston structure in which at least one of a positive electrode current collector and a negative electrode current collector is movable in a thickness direction of the battery.   The battery according to claim 3 or 4, wherein the variable structure is a structure in which the separator has flexibility.

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