WO2017175697A1 - 蓄電素子 - Google Patents
蓄電素子 Download PDFInfo
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- WO2017175697A1 WO2017175697A1 PCT/JP2017/013893 JP2017013893W WO2017175697A1 WO 2017175697 A1 WO2017175697 A1 WO 2017175697A1 JP 2017013893 W JP2017013893 W JP 2017013893W WO 2017175697 A1 WO2017175697 A1 WO 2017175697A1
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- Prior art keywords
- active material
- positive electrode
- material layer
- particles
- electrode active
- Prior art date
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Images
Classifications
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- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
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- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a storage element such as a lithium ion secondary battery.
- a battery in which a positive electrode is provided with positive electrode active material particles having a hollow structure having a shell part made of a layered lithium transition metal oxide and a hollow part formed therein is known.
- the major axis based on SEM observation of the primary particles of the lithium transition metal oxide is 1 ⁇ m or less, and the thickness based on SEM observation of the shell is 2 ⁇ m or less.
- the negative electrode includes negative electrode active material particles made of a carbon material.
- the negative electrode active material particles include graphite coated with amorphous carbon, and the krypton adsorption amount of the negative electrode active material particles is 3.5 m 2 / g or more and 4 m 2 / g or less. It is suppressed that the capacity maintenance rate of the battery described in Patent Document 1 decreases with time. That is, the battery described in Patent Document 1 has durability performance.
- Patent Document 1 may not always have sufficient input / output performance at a high rate.
- An object of the present embodiment is to provide a power storage device having sufficient durability and input / output performance at a high rate.
- the electricity storage device of this embodiment includes a positive electrode having a positive electrode active material layer containing a particulate active material, and the positive electrode active material layer includes primary particles of active material and secondary particles in which a plurality of primary particles are aggregated.
- the volume-based particle size frequency distribution of the active material of the positive electrode active material layer has a first peak and a second peak that appears on the larger particle diameter than the first peak.
- the ratio of the particles having a particle diameter of Dx or less is based on all particles of the active material. And not less than 5% and not more than 40%. According to the electricity storage device having such a configuration, both the durability performance and the input / output performance at a high rate can be sufficiently obtained.
- the volume-based particle size frequency distribution of the active material in the positive electrode active material layer has a first peak and a second peak that appears on the larger particle diameter than the first peak.
- the average particle diameter Dp of the primary particles and the particle diameter D1 of the first peak may satisfy the relational expression 0.5 ⁇ D1 / Dp ⁇ 2.
- the particle diameter D2 of the second peak may be 2 ⁇ m or more and 5 ⁇ m or less.
- the method for manufacturing a power storage device of this embodiment includes forming a positive electrode active material layer from a mixture containing at least secondary particles of an active material, producing a positive electrode having the positive electrode active material layer, and producing the produced positive electrode.
- a positive electrode active material layer from a mixture containing at least secondary particles of an active material
- producing a positive electrode having the positive electrode active material layer and producing the produced positive electrode.
- the power storage device to produce a positive electrode by pressing the positive electrode active material layer, the secondary particles are partly crushed to produce primary particles, and the positive electrode active material layer
- the ratio of the primary particles to the entire active material particles is adjusted to 5% or more and 40% or less.
- FIG. 1 is a perspective view of a power storage device according to this embodiment.
- FIG. 2 is a front view of the energy storage device according to the embodiment.
- 3 is a cross-sectional view taken along the line III-III in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.
- FIG. 5 is a perspective view of a state in which a part of the energy storage device according to the embodiment is assembled, and is a perspective view of a state in which a liquid filling tap, an electrode body, a current collector, and an external terminal are assembled to a lid plate. is there.
- FIG. 6 is a view for explaining the configuration of the electrode body of the energy storage device according to the embodiment.
- FIG. 7 is a cross-sectional view (cross-section VII-VII in FIG. 6) of the stacked positive electrode, negative electrode, and separator.
- FIG. 8 is a flowchart showing the steps of the method for manufacturing the power storage element.
- FIG. 9 is a perspective view of a power storage device including the power storage element according to the embodiment.
- FIG. 10 is a schematic view of positive electrode active material particles in the same embodiment.
- FIG. 11 is an image processing diagram obtained by binarizing the cross section of the positive electrode active material particles in the same embodiment.
- each component (each component) of this embodiment is a thing in this embodiment, and may differ from the name of each component (each component) in background art.
- the electricity storage device 1 of the present embodiment is a nonaqueous electrolyte secondary battery. More specifically, the electricity storage element 1 is a lithium ion secondary battery that utilizes electron movement that occurs in association with movement of lithium ions. This type of power storage element 1 supplies electric energy.
- the electric storage element 1 is used singly or in plural. Specifically, the storage element 1 is used as a single unit when the required output and the required voltage are small.
- power storage element 1 is used in power storage device 100 in combination with other power storage elements 1 when at least one of a required output and a required voltage is large. In the power storage device 100, the power storage element 1 used in the power storage device 100 supplies electric energy.
- the power storage device 1 includes an electrode body 2 including a positive electrode 11 and a negative electrode 12, a case 3 that houses the electrode body 2, and an external terminal 7 that is disposed outside the case 3. And an external terminal 7 that is electrically connected to the electrode body 2.
- the power storage element 1 includes a current collector 5 that electrically connects the electrode body 2 and the external terminal 7.
- the electrode body 2 is formed by winding a laminated body 22 in which the positive electrode 11 and the negative electrode 12 are laminated with the separator 4 being insulated from each other.
- the positive electrode 11 includes a metal foil 111 (positive electrode base material), an active material layer 112 disposed along the surface of the metal foil 111 and containing an active material, and between the metal foil 111 (positive electrode base material) and the active material layer 112. And a conductive layer 113 including a conductive additive.
- the conductive layer 113 overlaps both surfaces of the metal foil 111.
- the active material layer 112 overlaps with one surface of each conductive layer 113.
- the active material layers 112 are respectively disposed on both sides of the metal foil 111 in the thickness direction, and similarly, the conductive layers 113 are respectively disposed on both sides of the metal foil 111 in the thickness direction.
- the thickness of the positive electrode 11 is usually 40 ⁇ m or more and 150 ⁇ m or less.
- the metal foil 111 has a strip shape.
- the metal foil 111 of the positive electrode 11 of this embodiment is, for example, an aluminum foil.
- the positive electrode 11 has an uncovered portion (a portion where the positive electrode active material layer is not formed) 115 of the positive electrode active material layer 112 at one edge portion in the width direction, which is the short direction of the band shape.
- the positive electrode active material layer 112 includes a particulate active material, a particulate conductive aid, and a binder.
- the active material of the positive electrode 11 is a compound that can occlude and release lithium ions.
- the thickness of the positive electrode active material layer 112 (for one layer) is usually 20 ⁇ m or more and 90 ⁇ m or less.
- Basis weight of the positive electrode active material layer 112 (one layer) is 6.0 mg / cm 2 or more 16.5 mg / cm 2 or less.
- the density of the positive electrode active material layer 112 is 1.7 g / cm 3 or more and 2.6 g / cm 3 or less.
- the density is a density in one layer arranged so as to cover one surface of the metal foil 111.
- the positive electrode active material layer 112 includes primary particles 1121 of active materials and secondary particles 1122 in which a plurality of primary particles 1121 are aggregated.
- the positive electrode active material layer 112 includes primary particles 1121 that exist alone and secondary particles 1122 in which a plurality of primary particles are condensed.
- the secondary particles 1122 the primary particles are fixed to each other.
- a hollow portion 1123 is formed in at least a part of the secondary particles 1122. The hollow portion 1123 can be confirmed by binarizing an SEM image obtained by SEM observation of a cross section of the positive electrode active material layer cut in the thickness direction using an ion beam.
- FIG. 11 is an image obtained by binarizing SEM images of three types of positive electrode active materials having different hollow ratios.
- a region surrounded by the outer periphery of the white region is defined as a secondary particle, and a black region existing inside the secondary particle is defined as a hollow portion.
- divided the area of the said hollow part with the area (including the area of a hollow part) of a secondary particle is defined as a hollow ratio.
- the hollowness ratio of each particle shown in FIG. 11 is calculated as (a) 0%, (b) 9.9%, and (c) 11.4%.
- the hollow ratio of the positive electrode active material is preferably 5% or more, more preferably 10% or more.
- the ratio of primary particles to the entire active material particles is 5% or more and 40% or less. Such a ratio may be 10% or more and 35% or less. Such a ratio is a ratio of primary particles present alone in the positive electrode active material layer 112. Such a ratio is obtained by laser diffraction particle size distribution measurement.
- the proportion of primary particles can be increased by increasing the pressing pressure when producing the positive electrode 11. That is, since the secondary particles described above can be crushed more by increasing the press pressure, the proportion of primary particles in the positive electrode active material layer 112 can be increased.
- the volume-based particle size frequency distribution of the active material of the positive electrode active material layer 112 has a first peak and a second peak that appears on the larger particle diameter than the first peak.
- the average diameter Dp of the primary particles and the particle diameter D1 of the first peak satisfy a relational expression of 0.5 ⁇ D1 / Dp ⁇ 2.
- the value of D1 / Dp can be adjusted by changing the type of the particulate active material when the positive electrode active material layer 112 is produced. For example, a secondary particle having a larger secondary particle diameter than that of the primary particle constituting the secondary particle of the active material is employed, and a positive electrode active material is obtained from a mixture (described later) containing such secondary particles. By forming the material layer 112, the value of D1 / Dp can be increased.
- the frequency with respect to the particle size of the primary particle of said active material and said secondary particle is represented.
- the particle size frequency distribution is obtained by measurement using a laser diffraction / scattering type particle size distribution measuring apparatus.
- the particle size frequency distribution is determined on the basis of the volume of the particles. The measurement conditions are explained in detail in the examples.
- the battery is further charged with a constant voltage of 4.2 V for 3 hours. After discharging, a constant current is discharged to 2.0 V at a 1.0 C rate. Thereafter, constant voltage discharge is performed at 2.0 V for 5 hours.
- the battery is disassembled in a dry atmosphere.
- the active material layer is taken out, washed with dimethyl carbonate and crushed, and then vacuum-dried for 2 hours or more. Then, it can measure using a particle size distribution measuring apparatus.
- the average diameter Dp of the primary particles of the positive electrode active material layer 112 is usually 0.1 ⁇ m or more and 2.0 ⁇ m or less.
- the average primary particle diameter Dp is the average primary particle diameter present alone in the positive electrode active material layer 112.
- the average primary particle diameter Dp is determined by measuring at least 100 primary particle diameters in the scanning electron microscope observation image of the cross section in the thickness direction of the positive electrode active material layer 112 and averaging the measured values. If the primary particles are not spherical, the longest diameter is measured as the diameter.
- the particle diameter D1 of the first peak is usually 0.1 ⁇ m or more and 1.0 ⁇ m or less.
- the particle diameter D2 of the second peak is usually 2 ⁇ m or more and 5 ⁇ m or less.
- the proportion of particles having a particle diameter of Dx or less is the total amount of the active material. It is 5% or more and 40% or less with respect to the particles.
- the ratio of particles having a particle diameter of Dx or less is determined by the ratio of the area of the portion having a particle diameter of Dx or less in the particle size frequency distribution to the total area.
- the proportion of particles having a particle size of Dx or less is usually determined by software attached to the particle size distribution measuring apparatus described above.
- the porosity of the positive electrode active material layer 112 is usually 25% or more and 50% or less.
- the active material of the positive electrode 11 is, for example, a lithium metal oxide.
- the active material of the positive electrode is, for example, a composite oxide (Li x Ni a O 2 , Li x Co b O represented by Li x MeO e (Me represents one or more transition metals)). 2, Li x Mn c O 4 , Li x Ni a Co b Mn c O 2 , etc.), or, Li t Me u (XO v ) w (Me represents one or more transition metals, X is e.g. P, Si, B, a polyanion compounds represented by the representative of the V) (Li t Fe u PO 4, Li t Mn u PO 4, Li t Mn u SiO 4, Li t Co u PO 4 F , etc.).
- Li x Ni a Co b Mn c M d O lithium-metal composite oxide represented by the chemical composition of e, for example, LiNi 1/3 Co 1/3 Mn 1/3 O 2, LiNi 1/6 Co 1/6 Mn 2/3 O 2 , LiCoO 2 and the like.
- binder used for the positive electrode active material layer 112 examples include polyvinylidene fluoride (PVdF), a copolymer of ethylene and vinyl alcohol, polymethyl methacrylate, polyethylene oxide, polypropylene oxide, polyvinyl alcohol, polyacrylic acid, and polymethacrylic acid. Acid, styrene butadiene rubber (SBR).
- SBR styrene butadiene rubber
- the conductive additive of the positive electrode active material layer 112 is a carbonaceous material containing 98% by mass or more of carbon.
- Examples of the carbonaceous material include ketjen black (registered trademark), acetylene black, and graphite.
- the positive electrode active material layer 112 of this embodiment has acetylene black as a conductive additive.
- the conductive layer 113 includes a particulate conductive additive and a binder (binder). Note that the conductive layer 113 does not include a positive electrode active material.
- the conductive layer 113 is formed to be porous by a gap between the conductive assistants.
- the conductive layer 113 has conductivity because it includes a conductive additive.
- the conductive layer 113 serves as an electron path between the metal foil 111 and the positive electrode active material layer 112, and maintains electrical conductivity therebetween.
- the conductivity of the conductive layer 113 is usually higher than the conductivity of the active material layer 112.
- the conductive layer 113 is disposed between the metal foil 111 and the positive electrode active material layer 112.
- the conductive layer 113 containing a binder (binder) has sufficient adhesion to the metal foil 111.
- the conductive layer 113 has sufficient adhesion to the positive electrode active material layer 112.
- the thickness of the conductive layer 113 is usually 0.1 ⁇ m or more and 2.0 ⁇ m or less.
- the basis weight of the conductive layer 113 is usually 0.25 g / m 2 or more and 0.65 g / m 2 or less.
- the conductive additive of the conductive layer 113 is a carbonaceous material containing 98% by mass or more of carbon.
- the electric conductivity of the carbonaceous material is usually 10 ⁇ 6 S / m or more.
- Examples of the carbonaceous material include ketjen black (registered trademark), acetylene black, and graphite.
- the conductive layer 113 of this embodiment has acetylene black as a conductive additive.
- the particle diameter of the conductive assistant is usually 20 nm or more and 150 nm or less.
- binder for the conductive layer 113 examples include polyvinylidene fluoride (PVdF), a copolymer of vinylidene fluoride and hexafluoropropylene, a copolymer of ethylene and vinyl alcohol, polyacrylonitrile, polyphosphazene, polysiloxane, Polyvinyl acetate, polymethyl methacrylate, polystyrene, polycarbonate, polyamide, polyimide, polyamideimide, polyethylene oxide (polyethylene glycol), polypropylene oxide (polypropylene glycol), polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, polytetrafluoroethylene ( Synthetic polymer compounds such as PTFE), styrene butadiene rubber (SBR), polyolefin, and nitrile-butadiene rubber.
- binder of the conductive layer 113 examples include natural polymer compounds such as chitosan and chitosan derivatives, cellulose
- the conductive layer 113 usually contains 20% by mass or more and 50% by mass or less of a carbonaceous material as a conductive assistant, and contains 50% by mass or more and 80% by mass or less of a binder.
- the negative electrode 12 has a metal foil 121 (negative electrode base material) and a negative electrode active material layer 122 formed on the metal foil 121.
- the negative electrode active material layer 122 is overlaid on both surfaces of the metal foil 121.
- the metal foil 121 has a strip shape.
- the metal foil 121 of the negative electrode of this embodiment is, for example, a copper foil.
- the negative electrode 12 has an uncoated portion 125 of the negative electrode active material layer 122 (a portion where the negative electrode active material layer is not formed) at one end edge in the width direction, which is the short direction of the belt shape.
- the thickness (for one layer) of the negative electrode 12 is usually 40 ⁇ m or more and 150 ⁇ m or less.
- the negative electrode active material layer 122 includes a particulate active material and a binder.
- the negative electrode active material layer 122 is disposed so as to face the positive electrode 11 with the separator 4 interposed therebetween.
- the width of the negative electrode active material layer 122 is larger than the width of the positive electrode active material layer 112.
- the binder ratio may be 5% by mass or more and 10% by mass or less with respect to the total mass of the negative electrode active material and the binder.
- the active material of the negative electrode 12 can contribute to the electrode reaction of the charge reaction and the discharge reaction in the negative electrode 12.
- the active material of the negative electrode 12 has an alloying reaction with carbon materials such as graphite and amorphous carbon (non-graphitizable carbon and graphitizable carbon), or lithium ions such as silicon (Si) and tin (Sn).
- carbon materials such as graphite and amorphous carbon (non-graphitizable carbon and graphitizable carbon), or lithium ions such as silicon (Si) and tin (Sn).
- graphite means a carbon material having an average lattice spacing (d002) of (002) planes determined by a wide angle X-ray diffraction method of less than 0.340 nm.
- Amorphous carbon has a (002) plane spacing of 0.340 nm or more as measured by wide-angle X-ray diffraction in a discharged state.
- the active material of the negative electrode of this embodiment is
- the thickness of the negative electrode active material layer 122 (for one layer) is usually 10 ⁇ m or more and 50 ⁇ m or less.
- the weight per unit area (one layer) of the negative electrode active material layer 122 is usually 2.5 mg / cm 2 or more and 5.0 mg / cm 2 or less.
- the density (one layer) of the negative electrode active material layer 122 is usually 0.8 g / cm 3 or more and 1.6 g / cm 3 or less.
- the binder used for the negative electrode active material layer 122 is the same as the binder used for the positive electrode active material layer 112.
- the binder of this embodiment is polyvinylidene fluoride.
- the negative electrode active material layer 122 may further include a conductive additive such as ketjen black (registered trademark), acetylene black, or graphite.
- a conductive additive such as ketjen black (registered trademark), acetylene black, or graphite.
- the positive electrode 11 and the negative electrode 12 configured as described above are wound in a state where they are insulated by the separator 4. That is, in the electrode body 2 of the present embodiment, the stacked body 22 of the positive electrode 11, the negative electrode 12, and the separator 4 is wound.
- the separator 4 is a member having insulating properties.
- the separator 4 is disposed between the positive electrode 11 and the negative electrode 12. Thereby, in the electrode body 2 (specifically, the laminated body 22), the positive electrode 11 and the negative electrode 12 are insulated from each other.
- the separator 4 holds the electrolytic solution in the case 3. Thereby, at the time of charging / discharging of the electrical storage element 1, lithium ion moves between the positive electrode 11 and the negative electrode 12 which are laminated
- the separator 4 has a strip shape.
- the separator 4 has a porous separator base material.
- the separator 4 of this embodiment has only a separator base material.
- the separator 4 is disposed between the positive electrode 11 and the negative electrode 12 in order to prevent a short circuit between the positive electrode 11 and the negative electrode 12.
- the separator substrate is made of a porous material such as a woven fabric, a nonwoven fabric, or a porous film.
- the material for the separator substrate include polymer compounds, glass, and ceramics.
- the polymer compound include polyesters such as polyacrylonitrile (PAN), polyamide (PA), and polyethylene terephthalate (PET), polyolefins (PO) such as polypropylene (PP) and polyethylene (PE), and cellulose. .
- the width of the separator 4 (the dimension of the strip shape in the short direction) is slightly larger than the width of the negative electrode active material layer 122.
- the separator 4 is disposed between the positive electrode 11 and the negative electrode 12 that are stacked in a state of being displaced in the width direction so that the positive electrode active material layer 112 and the negative electrode active material layer 122 overlap. At this time, as shown in FIG. 6, the non-covered portion 115 of the positive electrode 11 and the non-covered portion 125 of the negative electrode 12 do not overlap.
- the uncovered portion 115 of the positive electrode 11 protrudes in the width direction from the region where the positive electrode 11 and the negative electrode 12 overlap, and the non-covered portion 125 of the negative electrode 12 extends from the region where the positive electrode 11 and the negative electrode 12 overlap in the width direction ( It protrudes in a direction opposite to the protruding direction of the non-covering portion 115 of the positive electrode 11.
- the electrode body 2 is formed by winding the stacked positive electrode 11, negative electrode 12, and separator 4, that is, the stacked body 22.
- the portion where only the uncovered portion 115 of the positive electrode 11 or the uncovered portion 125 of the negative electrode 12 is stacked constitutes the uncoated stacked portion 26 in the electrode body 2.
- the uncoated laminated portion 26 is a portion that is electrically connected to the current collector 5 in the electrode body 2.
- the uncoated laminated portion 26 has two portions (divided uncoated laminated portions) across the space portion 27 (see FIG. 6) in the winding center direction view of the wound positive electrode 11, negative electrode 12, and separator 4. ) 261.
- the uncoated laminated portion 26 configured as described above is provided at each electrode of the electrode body 2. That is, the non-coated laminated portion 26 in which only the non-coated portion 115 of the positive electrode 11 is laminated constitutes the non-coated laminated portion of the positive electrode 11 in the electrode body 2, and the non-coated laminated layer in which only the non-coated portion 125 of the negative electrode 12 is laminated. The portion 26 constitutes an uncoated laminated portion of the negative electrode 12 in the electrode body 2.
- the case 3 includes a case main body 31 having an opening and a lid plate 32 that closes (closes) the opening of the case main body 31.
- the case 3 houses the electrolytic solution in the internal space together with the electrode body 2 and the current collector 5.
- Case 3 is formed of a metal having resistance to the electrolytic solution.
- the case 3 is made of an aluminum-based metal material such as aluminum or an aluminum alloy, for example.
- the case 3 may be formed of a metal material such as stainless steel and nickel, or a composite material obtained by bonding a resin such as nylon to aluminum.
- the electrolytic solution is a non-aqueous electrolytic solution.
- the electrolytic solution is obtained by dissolving an electrolyte salt in an organic solvent.
- the organic solvent include cyclic carbonates such as propylene carbonate and ethylene carbonate, and chain carbonates such as dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate.
- the electrolyte salt is LiClO 4 , LiBF 4 , LiPF 6 or the like.
- the electrolytic solution of this embodiment is obtained by dissolving 0.5 to 1.5 mol / L LiPF 6 in a mixed solvent in which propylene carbonate, dimethyl carbonate, and ethyl methyl carbonate are mixed at a predetermined ratio.
- the case 3 is formed by joining the peripheral edge of the opening of the case main body 31 and the peripheral edge of the rectangular lid plate 32 in an overlapping state.
- the case 3 has an internal space defined by the case main body 31 and the lid plate 32.
- the opening peripheral part of the case main body 31 and the peripheral part of the cover plate 32 are joined by welding.
- the long side direction of the cover plate 32 is the X-axis direction
- the short side direction of the cover plate 32 is the Y-axis direction
- the normal direction of the cover plate 32 is the Z-axis direction.
- the case main body 31 has a rectangular tube shape (that is, a bottomed rectangular tube shape) in which one end in the opening direction (Z-axis direction) is closed.
- the lid plate 32 is a plate-like member that closes the opening of the case body 31.
- the lid plate 32 has a gas discharge valve 321 that can discharge the gas in the case 3 to the outside.
- the gas discharge valve 321 discharges gas from the inside of the case 3 to the outside when the internal pressure of the case 3 rises to a predetermined pressure.
- the gas discharge valve 321 is provided at the center of the lid plate 32 in the X-axis direction.
- Case 3 is provided with a liquid injection hole for injecting an electrolytic solution.
- the liquid injection hole communicates the inside and the outside of the case 3.
- the liquid injection hole is provided in the lid plate 32.
- the liquid injection hole is sealed (closed) by a liquid injection stopper 326.
- the liquid filling tap 326 is fixed to the case 3 (the cover plate 32 in the example of the present embodiment) by welding.
- the external terminal 7 is a part that is electrically connected to the external terminal 7 of another power storage element 1 or an external device.
- the external terminal 7 is formed of a conductive member.
- the external terminal 7 is formed of a highly weldable metal material such as an aluminum-based metal material such as aluminum or aluminum alloy, or a copper-based metal material such as copper or copper alloy.
- the external terminal 7 has a surface 71 to which a bus bar or the like can be welded.
- the surface 71 is a flat surface.
- the external terminal 7 has a plate shape extending along the lid plate 32. Specifically, the external terminal 7 has a rectangular plate shape when viewed in the Z-axis direction.
- the current collector 5 is disposed in the case 3 and is directly or indirectly connected to the electrode body 2 so as to be energized.
- the current collector 5 of the present embodiment is connected to the electrode body 2 through the clip member 50 so as to be energized. That is, the electrical storage element 1 includes a clip member 50 that connects the electrode body 2 and the current collector 5 so as to allow energization.
- the current collector 5 is formed of a conductive member. As shown in FIG. 3, the current collector 5 is disposed along the inner surface of the case 3. The current collector 5 is disposed on each of the positive electrode 11 and the negative electrode 12 of the power storage element 1. In the power storage device 1 of the present embodiment, the case 3 is arranged in the uncoated stacked portion 26 of the positive electrode 11 and the uncoated stacked portion 26 of the negative electrode 12 in the electrode body 2.
- the current collector 5 of the positive electrode 11 and the current collector 5 of the negative electrode 12 are formed of different materials. Specifically, the current collector 5 of the positive electrode 11 is formed of, for example, aluminum or an aluminum alloy, and the current collector 5 of the negative electrode 12 is formed of, for example, copper or a copper alloy.
- the electrode body 2 (specifically, the electrode body 2 and the current collector 5) housed in a bag-like insulating cover 6 that insulates the electrode body 2 and the case 3 is the case 3. Housed inside.
- the method for manufacturing a power storage device forms a positive electrode active material layer from a mixture containing at least secondary particles of an active material, and produces a positive electrode having the positive electrode active material layer. (Step 1) and assembling a power storage device using the produced positive electrode (Step 2).
- Step 1) and assembling a power storage device using the produced positive electrode (Step 2).
- Step 2 In producing the positive electrode, a portion of the secondary particles are crushed by pressing the positive electrode active material layer to generate primary particles, and the ratio of the primary particles to the total active material particles in the positive electrode active material layer is 5 % To 40%.
- an electrode including the production of the positive electrode as described above (Step 1) and the production of the negative electrode, and an electrode body having the positive electrode and the negative electrode are formed. And assembling the electricity storage element by placing the electrode body in a case.
- the method for manufacturing the electricity storage device 1 first, a mixture containing an active material is applied to a metal foil (electrode base material), an active material layer is formed, and electrodes (positive electrode 11 and negative electrode 12) are produced. To do. Note that in the production of the positive electrode 11, the conductive material 113 containing a conductive additive is formed on the metal foil 111, and then the active material layer 112 is formed. Next, the positive electrode 11, the separator 4, and the negative electrode 12 are overlapped to form the electrode body 2. Subsequently, the electrode body 2 is put in the case 3 and the electrolytic solution is put in the case 3 to assemble the power storage element 1.
- Step 1 preparation of the positive electrode 11
- a conductive layer composition containing a conductive additive, a binder, and a solvent is applied to both sides of the metal foil, and the composition is dried at, for example, 100 to 160 degrees.
- the conductive layer 113 is formed.
- the positive electrode active material layer 112 is formed by applying a mixture containing an active material, a binder, and a solvent to each conductive layer.
- a coating method for forming the conductive layer 113 and the positive electrode active material layer 112 a general method is employed.
- the applied conductive layer 113 and positive electrode active material layer 112 are roll-pressed at a predetermined temperature (for example, 80 to 150 ° C.) and a predetermined pressure (for example, a linear pressure of 5 to 100 kg / cm). By adjusting the pressing pressure, the density of the conductive layer 113 and the positive electrode active material layer 112 can be adjusted. After pressing, vacuum drying is performed at 80 to 140 ° C. for 12 to 24 hours. Note that a negative electrode is similarly formed without forming a conductive layer.
- the positive electrode active material layer 112 is formed so that the ratio of the primary particles to the entire active material particles in the positive electrode active material layer 112 is 5% or more and 40% or less.
- the positive electrode active material layer 112 can be formed so that the average diameter Dp of the primary particles described above and the particle diameter D1 of the first peak satisfy the relational expression of 0.5 ⁇ D1 / Dp ⁇ 2.
- the positive electrode active material layer 112 can be formed so that the ratio of the above-described particles having a particle diameter of Dx or less is 5% or more and 40% or less with respect to all particles of the active material.
- the positive electrode active material layer 112 can be formed so that the particle diameter D2 of the second peak described above is 2 ⁇ m or more and 5 ⁇ m or less.
- a mixture is prepared using secondary particles in which primary particles of the active material are condensed.
- the ratio of the primary particles described above, the ratio of the particles having the particle diameter of Dx or less, and the like can be adjusted by adjusting the press pressure of the roll press.
- the secondary particles can be further crushed by increasing the press pressure. For this reason, it is possible to increase the primary particles generated by crushing the secondary particles. Therefore, by increasing the press pressure, the ratio of the primary particles described above can be increased, and the ratio of the particles having the particle diameter of Dx or less can be increased.
- the ratio of the primary particles described above and the ratio of the particles having the particle diameter of Dx or less can be adjusted also by the following method. For example, when a mixture containing secondary particles (active material), a binder, and a solvent is mixed, by increasing the shearing force applied to the mixture, more secondary particles are crushed, and the positive electrode active material More primary particles in layer 112 can be provided. Further, for example, a mixture in which primary particles are generated by crushing secondary particles can be blended in the mixture. By increasing the crushing force, the primary particles in the positive electrode active material layer 112 can be increased.
- the electrode body 2 is formed by winding the laminated body 22 with the separator 4 sandwiched between the positive electrode 11 and the negative electrode 12. Specifically, the positive electrode 11, the separator 4, and the negative electrode 12 are overlapped so that the positive electrode active material layer 112 and the negative electrode active material layer 122 face each other through the separator 4, thereby forming the laminate 22. Subsequently, the stacked body 22 is wound to form the electrode body 2.
- the electrode body 2 is inserted into the case body 31 of the case 3, the opening of the case body 31 is closed with the cover plate 32, and the electrolytic solution is injected into the case 3.
- the electrode body 2 is inserted into the case main body 31, the positive electrode 11 and the one external terminal 7 are electrically connected, and the negative electrode 12 and the other external terminal 7 are connected to each other.
- the opening of the case body 31 is closed with the lid plate 32.
- the positive electrode active material layer 112 includes primary particles of the active material and secondary particles in which a plurality of primary particles are aggregated.
- the ratio of the primary particles to the entire active material particles is 5% to 40%.
- the proportion of the primary particles is less than 5%, the battery has sufficient durability, but input / output performance may be insufficient.
- the ratio of the primary particles is larger than 40%, the surface area of the active material becomes too large, and the durability performance of the battery may be insufficient. Therefore, the electricity storage device 1 can sufficiently have both durability performance and input / output performance at a high rate.
- the volume-based particle size frequency distribution of the active material of the positive electrode active material layer 112 includes the first peak and the second peak that appears on the larger particle diameter than the first peak.
- the proportion of particles having a particle size of Dx or less Is 5% or more and 40% or less with respect to all particles of the active material.
- the positive electrode active material is a lithium metal composite oxide.
- the active material for the negative electrode is non-graphitizable carbon.
- the power storage device 1 can have both durability performance and input / output performance at a high rate more reliably and more sufficiently.
- the positive electrode active material layer 112 is formed from a mixture containing at least secondary particles of the active material, and the positive electrode 11 having the positive electrode active material layer 112 is produced. (Step 1) and assembling the electricity storage device 1 using the produced positive electrode 11 (Step 2). In Step 1, a part of the secondary particles is crushed by pressing the positive electrode active material layer 112 to generate primary particles, and the ratio of the primary particles to the total active material particles in the positive electrode active material layer 112 is 5%. Adjust to 40% or less. Thereby, the electrical storage element 1 of the structure mentioned above can be manufactured.
- the electric storage element of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.
- the configuration of another embodiment can be added to the configuration of a certain embodiment, and a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment.
- a part of the configuration of an embodiment can be deleted.
- the positive electrode having the conductive layer disposed between the metal foil and the active material layer has been described in detail.
- the positive electrode does not have the conductive layer, and the active material layer of the positive electrode is a metal. You may touch the foil directly.
- the electrodes in which the active material layers are disposed on both sides of the metal foil of each electrode have been described.
- the positive electrode 11 or the negative electrode 12 has the active material layer on one side of the metal foil. It may be provided only on the side.
- the power storage element 1 including the electrode body 2 in which the multilayer body 22 is wound has been described in detail.
- the power storage element of the present invention may include the multilayer body 22 that is not wound.
- the storage element may include an electrode body in which a positive electrode, a separator, a negative electrode, and a separator each formed in a rectangular shape are stacked a plurality of times in this order.
- the power storage element 1 is used as a chargeable / dischargeable non-aqueous electrolyte secondary battery (for example, a lithium ion secondary battery) has been described.
- the type and size (capacity) of the power storage element 1 are arbitrary. is there.
- the lithium ion secondary battery was demonstrated as an example of the electrical storage element 1 in the said embodiment, it is not limited to this.
- the present invention can be applied to various secondary batteries, and other power storage elements such as electric double layer capacitors.
- the power storage device 1 (for example, a battery) may be used in a power storage device 100 as shown in FIG. 9 (a battery module when the power storage device is a battery).
- the power storage device 100 includes at least two power storage elements 1 and a bus bar member 91 that electrically connects two (different) power storage elements 1 to each other.
- the technique of the present invention may be applied to at least one power storage element.
- a nonaqueous electrolyte secondary battery (lithium ion secondary battery) was produced as shown below.
- Test Example 1 (1) Preparation of positive electrode Composition for conductive layer by mixing and kneading N-methyl-2-pyrrolidone (NMP), conductive additive (acetylene black) and binder (PVdF) as a solvent was prepared.
- NMP N-methyl-2-pyrrolidone
- conductive additive acetylene black
- binder PVdF
- the blending amounts of the conductive assistant and the binder were 50% by mass and 50% by mass, respectively.
- the prepared composition for conductive layers was applied to both sides of an aluminum foil (15 ⁇ m thickness) so that the coating amount after drying (weight per unit area) was 0.1 mg / cm 2, and dried.
- N-methyl-2-pyrrolidone NMP
- NMP N-methyl-2-pyrrolidone
- a conductive additive acetylene black
- PVdF binder
- an active material LiNi 1/3 Co 1/3 ) having an average particle diameter D50 of 5 ⁇ m.
- a mixture for Mn 1/3 O 2 was mixed and kneaded to prepare a mixture for positive electrode.
- the blending amounts of the conductive assistant, binder, and active material were 4.5% by mass, 4.5% by mass, and 91% by mass, respectively.
- the prepared positive electrode mixture was applied to the conductive layer so that the coating amount (weight per unit area) after drying was 10 mg / cm 2 . After drying, a roll press was performed. Thereafter, it was vacuum dried to remove moisture and the like.
- the thickness of the active material layer (for one layer) after pressing was 30 ⁇ m.
- the density of the active material layer was 2.6 g / cm 3 .
- the porosity of the active material layer was 38.
- the thickness of the conductive layer after pressing was 1 ⁇ m.
- the density of the conductive layer was 1.0 g / cm 3 .
- -About active material As an active material mix
- the negative electrode mixture was prepared by mixing and kneading NMP as a solvent, a binder, and an active material. The binder was blended so as to be 7% by mass, and the active material was blended so as to be 93% by mass. The prepared negative electrode mixture was applied to both surfaces of a copper foil (thickness: 10 ⁇ m) so that the coating amount (weight per unit area) after drying was 4.0 mg / cm 2 . After drying, roll pressing was performed and vacuum drying was performed to remove moisture and the like. The thickness of the active material layer (for one layer) was 35 ⁇ m. The density of the active material layer was 1.2 g / cm 3 .
- Separator A polyethylene microporous film having a thickness of 22 ⁇ m was used as a separator.
- the air permeability of the polyethylene microporous membrane was 100 seconds / 100 cc.
- electrolytic solution one prepared by the following method was used.
- a non-aqueous solvent propylene carbonate, dimethyl carbonate, and ethyl methyl carbonate were mixed in a volume of 1 part by volume, and LiPF 6 was dissolved in this non-aqueous solvent so that the salt concentration was 1 mol / L.
- An electrolyte solution was prepared.
- Arrangement of electrode body in case A battery was manufactured by a general method using the positive electrode, the negative electrode, the electrolytic solution, the separator, and the case.
- a sheet-like material in which a separator was disposed between the positive electrode and the negative electrode and laminated was wound.
- the area of the portion where the positive electrode active material layer and the negative electrode active material layer overlapped was 5000 cm 2 .
- the wound electrode body was placed in the case body of an aluminum square battery case as a case.
- the positive electrode and the negative electrode were electrically connected to the two external terminals, respectively.
- a lid plate was attached to the case body.
- the above electrolytic solution was injected into the case from a liquid injection port formed on the cover plate of the case.
- the case was sealed by sealing the liquid injection port of the case.
- the active material layer of the positive electrode was taken out from the battery once manufactured.
- the extracted active material layer was immersed in NMP having a weight of 50 times or more and pretreated by ultrasonic dispersion for 30 minutes.
- a laser diffraction particle size distribution measuring device (“SALD2200” manufactured by Shimadzu Corporation) was used as a measuring device, and a dedicated application software DMS ver2 was used as measurement control software.
- SALD2200 A laser diffraction particle size distribution measuring device
- DMS ver2 was used as measurement control software.
- a scattering measurement mode is adopted, and a wet cell in which a dispersion liquid in which a measurement sample (active material) is dispersed is placed in an ultrasonic environment for 2 minutes, and then laser light is irradiated.
- the scattered light distribution was obtained from the measurement sample. Then, the scattered light distribution is approximated by a logarithmic normal distribution, and in the particle size frequency distribution (horizontal axis, ⁇ ), a particle having an accumulation degree of 50% (D50) in a range where the minimum is set to 0.021 ⁇ m and the maximum is set to 2000 ⁇ m. The diameter was defined as the average particle diameter. Further, the dispersion was composed of a surfactant and SN Dispersant 7347-C (product name) or Triton X-1 as a dispersant. 00 (product name).
- -Particle diameter D1 of the first peak, particle diameter D2 of the second peak There were two peaks in the particle size frequency distribution.
- the particle diameter at the maximum point of the peak with the smaller particle diameter was defined as the particle diameter D1 of the first peak.
- the particle diameter at the maximum point of the peak having the larger particle diameter was defined as the particle diameter D2 of the second peak.
- -Ratio of primary particles to the entire active material particles ratio of particles whose particle diameter is equal to or less than Dx (the particle diameter at the minimum point between two peaks)
- the particle diameter at the minimum point was defined as Dx.
- the sum of the values of all the measurement points is 100
- the sum of the values of the measurement points at a particle size smaller than the particle size Dx is defined as the ratio of primary particles to the entire active material particles.
- the discharge capacity C2 [Ah] after the endurance test of the battery was measured by performing constant current discharge up to 2.4V.
- C2 / C1 ⁇ 100 [%] was calculated using the above-mentioned C1 and C2, and this value was defined as the durability performance.
- the battery having the predetermined configuration of the present embodiment sufficiently exhibited both the durability performance and the input / output performance at a high rate.
- none of the other batteries exhibited sufficient durability performance and input / output performance at a high rate at the same time.
- 1 Power storage element (non-aqueous electrolyte secondary battery), 2: Electrode body, 26: Uncoated laminated part, 3: Case, 31: Case body, 32: Cover plate, 4: separator, 5: current collector, 50: clip member, 6: Insulation cover 7: External terminal, 71: Surface, 11: positive electrode, 111: Metal foil of positive electrode (positive electrode base material), 112: Positive electrode active material layer, 113: Conductive layer, 12: negative electrode, 121: negative electrode metal foil (negative electrode substrate), 122: negative electrode active material layer, 91: Bus bar member, 100: Power storage device.
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Abstract
Description
本実施形態の負極の活物質は、非晶質炭素である。より具体的には、負極の活物質は、難黒鉛化炭素である。
上1.6g/cm3 以下である。
以下では、図1に示すように、蓋板32の長辺方向をX軸方向とし、蓋板32の短辺方向をY軸方向とし、蓋板32の法線方向をZ軸方向とする。
子7は、蓋板32に沿って拡がる板状である。詳しくは、外部端子7は、Z軸方向視において矩形状の板状である。
(1)正極の作製
溶剤としてN-メチル-2-ピロリドン(NMP)と、導電助剤(アセチレンブラック)と、バインダ(PVdF)とを、混合し、混練することで、導電層用の組成物を調製した。導電助剤、バインダの配合量は、それぞれ50質量%、50質量%とした。調製した導電層用の組成物を、アルミニウム箔(15μm厚み)の両面に、乾燥後の塗布量(目付量)が0.1mg/cm2となるようにそれぞれ塗布し、乾燥させた。
次に、溶剤としてN-メチル-2-ピロリドン(NMP)と、導電助剤(アセチレンブラック)と、バインダ(PVdF)と、平均粒子径D50が5μmの活物質(LiNi1/3Co1/3Mn1/3O2)の粒子とを、混合し、混練することで、正極用の合剤を調製した。導電助剤、バインダ、活物質の配合量は、それぞれ4.5質量%、4.5質量%、91質量%とした。調製した正極用の合剤を、導電層に、乾燥後の塗布量(目付量)が10mg/cm2となるようにそれぞれ塗布した。乾燥後、ロールプレスを行った。その後、真空乾燥して、水分等を除去した。プレス後の活物質層(1層分)の厚みは、30μmであった。活物質層の密度は、2.6g/cm3であった。活物質層の多孔度は、38であった。プレス後の導電層の厚みは、1μmであった。導電層の密度は、1.0g/cm3であった。
・活物質について
合剤に配合する活物質として、一次粒子が互いに凝結した二次粒子(凝結粒子)を用いた。二次粒子を構成する一次粒子の平均粒子径は、0.8μmであった。斯かる平均粒子径は、上述した平均径Dpである。斯かる平均粒子径は、走査型電子顕微鏡観察像において、100個の一次粒子径の直径を測定し、測定値を平均することによって求めた。一次粒子が真球状でない場合、最も長い径を直径として測定した。
活物質としては、粒子状の非晶質炭素(難黒鉛化炭素)を用いた。また、バインダとしては、PVdFを用いた。負極用の合剤は、溶剤としてNMPと、バインダと、活物質とを混合、混練することで調製した。バインダは、7質量%となるように配合し、活物質は、93質量%となるように配合した。調製した負極用の合剤を、乾燥後の塗布量(目付量)が4.0mg/cm2となるように、銅箔(10μm厚み)の両面にそれぞれ塗布した。乾燥後、ロールプレスを行い、真空乾燥して、水分等を除去した。活物質層(1層分)の厚みは、35μmであった。活物質層の密度は、1.2g/cm3であった。
セパレータとして厚みが22μmのポリエチレン製微多孔膜を用いた。ポリエチレン製微多孔膜の透気度は、100秒/100ccであった。
電解液としては、以下の方法で調製したものを用いた。非水溶媒として、プロピレンカーボネート、ジメチルカーボネート、エチルメチルカーボネートを、いずれも1容量部ずつ混合した溶媒を用い、この非水溶媒に、塩濃度が1mol/LとなるようにLiPF6を溶解させ、電解液を調製した。
上記の正極、上記の負極、上記の電解液、セパレータ、及びケースを用いて、一般的な方法によって電池を製造した。
まず、セパレータが上記の正極および負極の間に配されて積層されてなるシート状物を巻回した。正極活物質層と負極活物質層とが重なった部分の面積は、5000cm2であった。次に、巻回されてなる電極体を、ケースとしてのアルミニウム製の角形電槽缶のケース本体内に配置した。続いて、正極及び負極を2つの外部端子それぞれに電気的に接続させた。さらに、ケース本体に蓋板を取り付けた。上記の電解液を、ケースの蓋板に形成された注液口からケース内に注入した。最後に、ケースの注液口を封止することにより、ケースを密閉した。
いったん製造した電池から正極の活物質層を取り出した。取り出した活物質層を50倍以上の重量のNMPに浸漬し、30分間の超音波分散によって前処理を施した。測定装置としてレーザー回折式粒度分布測定装置(島津製作所社製「SALD2200」)、測定制御ソフトとして専用アプリケーションソフトフェアDMS ver2を用いた。具体的な測定手法としては、散乱式の測定モードを採用し、測定試料(活物質)が分散する分散液が循環する湿式セルを2分間超音波環境下に置いた後に、レーザー光を照射し、測定試料から散乱光分布を得た。そして、散乱光分布を対数正規分布により近似し、その粒径頻度分布(横軸、σ)において最小を0.021μm、最大を2000μmに設定した範囲の中で累積度50%(D50)にあたる粒径を平均粒子径とした。また、分散液は、界面活性剤と、分散剤としてのSNディスパーサント 7347-C(製品名)またはトリトンX-1
00(製品名)とを含んでもよい。
粒径頻度分布において、2つのピークが存在した。粒子径が小さい方のピークの極大点における粒子径を第1のピークの粒子径D1とした。粒子径が大きい方のピークの極大点における粒子径を第2のピークの粒子径D2とした。
・活物質の粒子全体に対する一次粒子の割合
(粒子径がDx(2つのピーク間の極小点の粒子径)以下の粒子の割合)
上記粒径頻度分布において、D1とD2との間に極小点が存在した。極小点における粒子径をDxとした。粒径頻度分布において全測定点の値の和を100としたときの、粒子径Dxよりも小さな粒子径における測定点の値の和を、活物質の粒子全体に対する一次粒子の割合とした。
電池を表1に示す構成となるように変更した点以外は、試験例1と同様にしてリチウムイオン二次電池を製造した。
25℃の恒温槽中で5Aの充電電流、4.2Vの定電流定電圧充電を3時間行い、10分の休止後、5Aの放電電流にて2.4Vまで定電流放電を行うことで、当該電池の耐久試験前の放電容量C1[Ah]を測定した。25℃の恒温槽中で5Aの充電電流、4.2V
の定電流定電圧充電を3時間行い、65℃の環境にて30日間保管した.その後当該電池を25℃で4時間保持した後、25℃の恒温槽中で5Aの充電電流、4.2Vの定電流定電圧充電を3時間行い、10分の休止後、5Aの放電電流にて2.4Vまで定電流放電を行うことで、当該電池の耐久試験後の放電容量C2[Ah]を測定した。上述のC1およびC2をもちいてC2/C1×100[%]を計算し、この値を耐久性能とした。
25℃の恒温槽中で5Aの放電電流にて2.4Vまで定電流放電を行った後、上記放電容量C1の50%に相当する電気量を5Aの電流値で定電流充電し、10分の休止後、開回路電圧V1を測定した。その後当該電池を-10℃の恒温槽で4時間保管し、25Aの放電電流にて10秒間の定電流放電を行い、通電後10秒での閉回路電圧V2を測定した。その後5Aの放電電流にて50秒間の定電流放電を行い、10分の休止後、25Aの充電電流にて10秒間の定電流充電を行い、通電後10秒での閉回路電圧V3を測定した。上記V1、V2、V3をもちいて、電流値-5[A]での電圧をV2、電流値0[A]での電圧をV1、電流値5[A]での電圧をV3とした場合の直流抵抗R[Ω]を最小二乗法により算出し、その値の逆数1/RであるWをもちい、高レートでの入出力性能の指標とした。表1においては、各例におけるWの値Wxと、試験例1におけるWの値W1との比Wx/W1×100[%]の値を記載した
2:電極体、
26:非被覆積層部、
3:ケース、 31:ケース本体、 32:蓋板、
4:セパレータ、 5:集電体、 50:クリップ部材、
6:絶縁カバー、
7:外部端子、 71:面、
11:正極、
111:正極の金属箔(正極基材)、 112:正極活物質層、
113:導電層、
12:負極、
121:負極の金属箔(負極基材)、 122:負極活物質層、
91:バスバ部材、
100:蓄電装置。
Claims (4)
- 粒子状の活物質を含む正極活物質層を有する正極を備え、
前記正極活物質層は、活物質の一次粒子と、複数の前記一次粒子が凝集した二次粒子とを含み、
前記正極活物質層の活物質の体積基準による粒径頻度分布は、第1のピークと、該第1のピークよりも粒子径が大きい方に現れる第2のピークとを有し、
前記粒径頻度分布にて、前記第1のピークと前記第2のピークとの間で頻度が極小となる粒子径をDxとしたときに、粒子径がDx以下の粒子の割合は、活物質の全粒子に対して、5%以上40%以下である、蓄電素子。 - 前記一次粒子の平均径Dpと、前記第1のピークの粒子径D1とは、0.5≦D1/Dp≦2の関係式を満たす、請求項1に記載の蓄電素子。
- 前記第2のピークの粒子径D2は、2μm以上5μm以下である、請求項1又は2に記載の蓄電素子。
- 活物質の二次粒子を少なくとも含む合剤から正極活物質層を形成し、該正極活物質層を有する正極を作製することと、
作製された前記正極を用いて蓄電素子を組み立てることと、を備え、
前記正極を作製することでは、正極活物質層をプレスすることによって前記二次粒子の一部を解砕させて一次粒子を生じさせ、前記正極活物質層における活物質の粒子全体に対する前記一次粒子の割合を5%以上40%以下に調整する、蓄電素子の製造方法。
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- 2017-04-03 JP JP2018510586A patent/JP7054479B2/ja active Active
- 2017-04-03 US US16/090,727 patent/US11217782B2/en active Active
- 2017-04-03 KR KR1020187031453A patent/KR20180129884A/ko not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
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KR20180129884A (ko) | 2018-12-05 |
US20190115584A1 (en) | 2019-04-18 |
JPWO2017175697A1 (ja) | 2019-02-14 |
EP3442053A4 (en) | 2019-10-16 |
US11217782B2 (en) | 2022-01-04 |
CN109075310B (zh) | 2022-04-29 |
CN109075310A (zh) | 2018-12-21 |
JP7054479B2 (ja) | 2022-04-14 |
EP3442053A1 (en) | 2019-02-13 |
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