WO2012056846A1 - 二次電池およびその製造方法ならびに二次電池用熱接着性絶縁フィルム - Google Patents
二次電池およびその製造方法ならびに二次電池用熱接着性絶縁フィルム Download PDFInfo
- Publication number
- WO2012056846A1 WO2012056846A1 PCT/JP2011/072145 JP2011072145W WO2012056846A1 WO 2012056846 A1 WO2012056846 A1 WO 2012056846A1 JP 2011072145 W JP2011072145 W JP 2011072145W WO 2012056846 A1 WO2012056846 A1 WO 2012056846A1
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- WO
- WIPO (PCT)
- Prior art keywords
- electrode member
- secondary battery
- positive electrode
- current collector
- negative electrode
- Prior art date
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Classifications
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H01M10/052—Li-accumulators
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
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- 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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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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
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Definitions
- the present invention relates to a secondary battery, and more particularly to a secondary battery excellent in preventing occurrence of a short circuit between electrodes, a manufacturing method thereof, and a thermoadhesive insulating film for a secondary battery.
- Patent Document 1 describes that the intercalation of the ionic liquid to the negative electrode active material can be suppressed and expansion and peeling of the negative electrode can be prevented.
- Patent Document 1 includes an example of a polyimide adhesive tape as an insulating film.
- Patent Document 2 discloses an acrylic or silicon-based film such as a biaxially stretched polypropylene film. The adhesive tape which apply
- JP 2009-199960 A Japanese Patent Laying-Open No. 2005-126452 Japanese Patent No. 4440573
- an object of the present invention is to provide a secondary battery in which foreign matter is effectively prevented from entering the battery and a method for manufacturing the same.
- a secondary battery according to the present invention is a secondary battery in which an electrode body in which a positive electrode member, a separator member, and a negative electrode member are stacked in this order is stored in an outer package,
- Each of the negative electrode members includes a current collector and an active material layer formed to cover one end side of the current collector, and an insulator made of an insulating material that does not exhibit adhesiveness at room temperature is the positive electrode. Pasted on the current collector constituting the member or the negative electrode member with an adhesive force of 1 N / 15 mm or more, and the periphery of the positive electrode member or the negative electrode member has a cut surface including the current collector and the insulator It consists of what is characterized by having.
- the insulator for preventing a short circuit inside the battery is formed of an insulating material that does not exhibit tackiness (adhesiveness) at room temperature, the current collector is cut together with the insulator.
- the periphery of the positive electrode member or the negative electrode member it is possible to effectively prevent foreign matter from being mixed into the battery due to the adhesive material adhering to the cutting die used for cutting, the blade of the cutter, or the like.
- not showing adhesiveness at normal temperature means not adhering when an insulating material is brought into contact with an adherend at a temperature of 30 ° C. or less which is a normal working environment.
- a terminal member is connected to the other end of the current collector, and a part of the terminal member is exposed to the outside of the exterior body.
- the insulator is made of a heat adhesive insulating film. More specifically, the thermal adhesive insulating film has a base layer made of polyolefin such as polypropylene and a thermal adhesive layer made of modified polyolefin such as polypropylene modified with unsaturated carboxylic acid or a derivative thereof. Is preferred.
- the base material layer is fused to the heat plate of the heat sealer while the heat bonding layer is thermally bonded to the current collector in the heat bonding step of the secondary battery manufacturing process. It is possible to effectively prevent wearing.
- the insulator is thermally bonded so as to cover a boundary between the exposed surface of the current collector and the active material layer.
- the current collector, the active material layer, and the insulator are arranged in this order on a part of the periphery of the positive electrode member, for example, one side on the lead portion side where the positive electrode terminal is provided. Since the laminated cut surfaces can be easily formed, it is possible to effectively prevent the insulator from peeling while using the exposed area of the active material to the maximum.
- the secondary battery of the present invention is preferably configured as a lithium ion secondary battery in which an electrolyte containing lithium ions is injected into the outer package. Moreover, it is preferable that the said insulator is affixed on the electrical power collector which comprises the said positive electrode member, and this electrical power collector consists of aluminum. By applying the present invention to such a lithium ion secondary battery having a current collector made of aluminum, a secondary battery having stable battery performance can be provided.
- the insulator is thermally bonded on at least the current collector, and the positive electrode member or the negative electrode member has a cut surface including at least the current collector and the insulator, thereby insulating. Even when the current collector provided with the body is cut and molded, it is possible to prevent foreign matter from adhering to the blade of the cutter for cutting and the like to enter the battery and adversely affect the battery performance. In addition, even in an environment where the current collector is in contact with the electrolytic solution, it is possible to improve resistance to peeling of the insulator bonded to the current collector.
- the manufacturing method of the secondary battery which concerns on this invention is the manufacturing method of the secondary battery which stored the electrode body which laminated
- the positive electrode member or the negative electrode member is formed by cutting the foil as described above, the foil is connected to one end of a terminal member, and the electrode body is mounted so that the other end of the terminal member is exposed from the exterior body. It is a method characterized by storing in the exterior body.
- an adhesive substance is applied to a cutting die, a cutter blade, or the like used for cutting by cutting the foil to which the insulator is bonded together with the insulator. It is possible to effectively prevent foreign matter from entering the battery due to the adhesion.
- the positive electrode member or the negative electrode member is formed by cutting the foil so as to include the laminated portions, and the electrolytic solution is injected into the exterior body.
- the secondary battery and the method for manufacturing the same according to the present invention, even when the current collector provided with the insulator is cut and molded, foreign matter adheres to the blade of the cutter for cutting and is mixed into the battery. Thus, adverse effects on battery performance can be suppressed. In addition, even in an environment where the current collector is in contact with the electrolytic solution, it is possible to improve resistance to peeling of the insulator bonded to the current collector.
- the current collector is formed by cutting the cut surface at a position including the insulator, It is possible to maintain the performance of the battery by increasing the exposed area of the active material layer as much as possible. In addition, even in an environment where shearing stress such as a cutter is applied to the bonding portion between the insulator and the active material layer, the insulator can be effectively prevented from peeling off.
- FIG. 1 shows a configuration of a positive electrode member constituting the lithium ion secondary battery of FIG. 1, in which (A) is a plan view, (B) is a cross-sectional view along line BB in (A), and (C) is a CC line in (A). It is sectional drawing.
- FIG. 2 is a plan view showing a manufacturing process of the lithium ion secondary battery of FIG. 1, and (A) to (D) are manufacturing processes.
- reference numeral 1 in FIG. 1 denotes a positive electrode member, and a positive electrode active material is applied to both surfaces of a positive electrode current collector foil as described later.
- Reference numeral 2 denotes a negative electrode member.
- a negative electrode active material is applied to both surfaces of the negative electrode current collector foil, and is formed in a size larger in area than the positive electrode 1.
- Reference numeral 3 denotes a separator member, which is disposed between the positive electrode and the negative electrode and is formed in a size at least as large as that of the negative electrode member 2.
- Each of the members 1 to 3 is laminated in the order of a positive electrode member 1, a separator member 3, a negative electrode member 2, a separator member 3, a positive electrode member 1, a separator member 3, and a negative electrode member 2 (not shown).
- reference numeral 4 denotes a terminal member that is connected to the positive electrode member 1 and is electrically connected to a circuit (not shown) outside the exterior body, and there is a similar terminal member on the negative electrode side.
- Reference numeral 5 denotes a connecting portion as a location where the positive electrode member 1 and the terminal member 4 are connected by ultrasonic welding. Since the positive electrode member 1 is composed of a plurality of current collector foils, a plurality of positive electrode current collector foils are stacked on the terminal member 4 and ultrasonically welded from both sides to be integrated.
- Reference numeral 6 denotes an insulating resin layer formed around the terminal member 4, and is formed so as to surround the periphery of the terminal member 4 in the width direction as illustrated.
- Reference numeral 7 denotes an exterior body, which is formed by heat-sealing the peripheral portions of two laminated films, and one side sandwiches the terminal member 4 and the insulating resin layer 6 therebetween.
- the electrolytic solution is injected into the outer layer body 7 including the positive electrode member 1, the separator member 3, and the negative electrode member 2.
- the positive electrode member 1 shown in FIG. 2 includes a current collector foil 10 and a positive electrode active material 11, and has a positive current collector foil lead portion 12 configured as a part of the current collector foil 10.
- the lead portion 12 of the positive electrode current collector foil is a rectangular portion having a length ( ⁇ + ⁇ ) mm and a width Y mm.
- the configuration is the same as that of the positive electrode member 1 except that the size is large and the negative electrode current collector foil lead portion 12 is located on the left side of the drawing.
- a heat-bonding insulating film 13 is formed on the surface of the positive electrode member 1 and has a reverse L shape as shown in FIG. 2A, and is a first region having a vertical ⁇ mm and a horizontal (X + Y) mm. And a second region having a length of ⁇ mm and a width of Y mm. Moreover, the edge part of the separator member 3 is arrange
- the cross section BB shown in FIG. 2 (B) has a five-layer structure of a heat adhesive insulating film 13, a positive electrode active material 11, a positive electrode current collector foil 10, a positive electrode active material 11, and a heat adhesive insulating film 13 from the top. It has become.
- the cross-section exposed portion of such a five-layer structure is An L-shape consisting of one side (length X mm) on the lead portion 12 side and a part of the side end side (length ⁇ mm) of the lead portion 12 extending in a direction perpendicular to the one side while being connected to one end of the one side.
- the end portion of the thermal adhesive insulating film 13 is formed from the positive electrode active material 11 to the positive electrode current collector foil 10 so as to cover the end portion of the positive electrode active material 11. Is formed.
- the formation example of such a heat adhesive insulating film 13 is merely an example, and a modification in which the heat adhesive insulating film 13 does not extend from the positive electrode active material 11 to the positive electrode current collector foil 10 may be adopted. Is possible. For example, it is possible to prevent a short circuit by forming the thermal adhesive insulating film 13 only on the positive electrode current collector foil 10.
- the manufacturing method of a lithium ion secondary battery is demonstrated.
- the positive electrode current collector foil 10 (FIG. 3A) is coated with the positive electrode active material 11, dried, and the thermal adhesive insulating film 13 is heated to 140 ° C. to 160 ° C. so as to cover the end of the positive electrode active material 11. Thermal bonding at temperature.
- the positive electrode member 1 is formed by cutting with a cutter or the like leaving the first region and the lead portion 12 described above (FIG. 3C).
- the heat-bonding insulating film 13 is made of an insulating material that does not exhibit tackiness (adhesiveness) at room temperature, the heat-bonding insulating film 13 may adhere to the blade of the cutter even when the positive electrode member 1 is cut. Absent. Therefore, foreign matter is prevented from adhering to the cutter blade and the like, and consequently foreign matter is effectively prevented from entering the battery.
- the negative electrode active material 11 is applied to the negative electrode current collector foil 10 and dried, and the negative electrode member 2 is formed by cutting with a cutter or the like.
- the negative electrode member 2, the separator member 3, and the positive electrode member 1 are laminated in this order, and the lead member 12 of the current collector foil 10 and the terminal member 4 with the insulating resin layer 6 are welded to manufacture a battery element.
- the battery element is placed between the two laminated films and sealed on three sides.
- one side of the three sides to be sealed is heat-sealed between two laminate films with an insulating layer surrounding the periphery of the terminal member 4 disposed in the width direction (FIG. 3D). ).
- the thermal adhesive insulating film 13 is a composite film of at least two layers composed of a base material layer (a) and an adhesive layer (b), and the base material layer (a) does not dissolve in the electrolytic solution, A polyolefin resin is preferred in order not to lower the performance.
- the polyolefin resin include polyethylene and polypropylene (PP), but the base material layer (a) is used because the base material layer is not fused to the heat plate when thermally bonded with a hot plate heat sealer.
- the melting point of the adhesive layer (b) is preferably (a) ⁇ (b), and the base material layer (a) is preferably a polypropylene resin having a high melting point.
- the polypropylene resin is a homopolypropylene resin (hereinafter sometimes abbreviated as homo PP), which is a homopolymer of propylene, or a random copolymer resin copolymerized with ethylene (hereinafter abbreviated as EPC).
- An example is a block copolymer resin (hereinafter sometimes abbreviated as block PP) in which an elastomer component of an ethylene / propylene copolymer is blended at a molecular level during polymerization of polypropylene.
- the melting point of EPC resin is around 140 ° C.
- the melting point of homo PP and block PP is 160 ° C. to 165 ° C.
- the polypropylene resin of the base material layer is more preferably homo PP or block PP.
- the polyolefin resin of the adhesive layer (b) needs to be modified with an unsaturated carboxylic acid or a derivative thereof.
- the amount of modification is not particularly limited, but it is preferable that the adhesive strength with the current collector is 10 N / 15 mm or more so that the thermal adhesive insulating film 13 does not peel off when cutting with a cutter, and the thermal bonding temperature is from 140 ° C.
- the amount of modification is preferably 0.01% by weight or more, and is preferably 4% by weight or less from the viewpoint of thermal stability during film processing. .
- unsaturated carboxylic acids or derivatives thereof include unsaturated monocarboxylic acids such as acrylic acid and methacrylic acid, unsaturated dicarboxylic acids such as maleic acid, fumaric acid, itaconic acid, and citraconic acid, and anhydrides thereof.
- unsaturated monocarboxylic acids such as acrylic acid and methacrylic acid
- unsaturated dicarboxylic acids such as maleic acid, fumaric acid, itaconic acid, and citraconic acid
- anhydrides thereof One or a mixture of two or more of maleic acid, itaconic anhydride, citraconic anhydride, unsaturated monocarboxylic acid and alcohol ester ethyl acrylate, methyl acrylate, methyl methacrylate, butyl acrylate, etc.
- Polyolefin resins to be modified include resins such as polypropylene and polyethylene, but when the resin of the base layer (a) is a polypropylene resin, the resin of the adhesive layer (b) is also modified to a polypropylene resin This is preferable because the interlayer adhesive strength with the base material layer (a) becomes strong.
- a method for producing a polyolefin resin laminated film comprising the base material layer (a) and the adhesive layer (b)
- co-extrusion molding methods such as a T-die method and an inflation method.
- There is also a method of stretching the extruded film but the oriented film undergoes orientational crystallization by stretching, and the adhesive force with the electrode active material and the metal foil is reduced. Therefore, an unstretched film having a birefringence of 1 ⁇ 10 ⁇ 2 or less, which is an orientation parameter, is preferable.
- the melt flow rate of the resin used for the base material layer and the adhesive layer is not particularly limited as long as it can be formed as a film, but the melt flow rate (in accordance with JIS K-7210 conforms to the stability and stability during film formation).
- the propylene-based polymer has a temperature of 230 ° C.
- the polyethylene-based polymer has a temperature of 190 ° C.
- a value measured with a load of 21.18 N is preferably in the range of 1 to 20 g / 10 min. From the viewpoint of stability, it is preferable that the difference between the melt flow rates is 10 g / 10 min or less.
- the thickness of the polyolefin-based resin laminated film is not particularly limited, but the film thickness is preferably in the range of 20 to 100 ⁇ m from the viewpoint of film formation stability, and an increase in the thickness of the portion where the insulator overlaps the current collector foil is prevented. In order to increase the capacity of the secondary battery by increasing the number of laminated layers, it is preferable that the thickness of the film is as thin as possible.
- the thickness of the adhesive layer (b) is 1 ⁇ m or less, the heat and pressure of heat sealing may cause the molten resin to flow and the thickness of the adhesive layer (b) to become thin, and the adhesive strength to the metal foil may decrease. is there. For this reason, a thicker adhesive layer (b) is more advantageous for adhesion, but the thickness of the adhesive layer (b) is preferably 1 to 10 ⁇ m from the viewpoint of economy.
- the base material layer (a) and the adhesive layer (b) preferably have a melting point of (a) ⁇ (b).
- Heat sealing is preferably performed at a temperature equal to or lower than the melting point of the material layer (a).
- a functional group is introduced into the adhesive layer resin, it may be bonded even below the melting point. Therefore, a polyolefin resin graft-modified with an unsaturated carboxylic acid or a derivative thereof, which is representative of these resins, is used for the adhesive layer.
- the base material layer and the adhesive layer may have a melting point or lower and can be firmly bonded without thermal deformation or fusion of the base material layer.
- the resin of the base layer (a) is homopolypropylene
- the resin of the adhesive layer (b) is an unsaturated carboxylic acid or a random copolymer obtained by copolymerizing propylene with a component such as ethylene or butene to lower the melting point. Those which are graft-modified with a derivative are preferred.
- an elastomer component for the purpose of improving the low temperature impact property and the bending whiteness property may be added within a range not deteriorating the adhesion property and the battery performance.
- an organic lubricant that imparts film slipperiness or an inorganic or organic antiblocking agent that prevents blocking is used within a range that does not deteriorate the adhesion or battery performance. It may be added.
- the adhesive layer (b) is formed by a resin alone and is dry-laminated with an adhesive such as a biaxially stretched PP film or a biaxially stretched polyester film, but the manufacturing cost increases, and the adhesive battery Therefore, composite film formation with a base material layer is preferable.
- Example 1 According to the manufacturing process shown in FIG. 3, a lithium ion secondary battery was manufactured using a rolled aluminum foil as the positive electrode current collector foil and an electrolytic copper foil as the negative electrode current collector foil.
- the positive electrode active material was formed by applying a transition metal lithium acid, LiMn 2 O 4 as a main component, and using polyvinylidene fluoride (PVDF) as a binder, applying it onto an aluminum foil, drying it, and roll pressing it.
- PVDF polyvinylidene fluoride
- the negative electrode active material was formed by applying graphite powder as a main component and using polyvinylidene fluoride as a binder on an electrolytic copper foil, drying, and roll pressing.
- the electrolytic solution used was a solution in which an electrolyte salt LiPF 6 was dissolved using a mixed solution mainly composed of diethyl carbonate and ethylene carbonate as a solvent.
- the part which bonded the insulating film to the aluminum foil was cut out with a width of 2 mm, and the adhesive force between the insulating film and the aluminum foil was measured at a tensile speed of 300 mm / min using an orientec Tensilon. Converted to value.
- the presence or absence of adhesion with the seal bar is judged, and the blade of the cutter is visually observed when the current collector foil is cut with a cutter, and the adhesive to the cutter blade The presence or absence of adhesion was judged.
- the insulating film uses a homo PP having a melting point of 161 ° C. by DSC (differential scanning calorimeter) as a base material layer, and the adhesive layer is made by Mitsubishi Chemical, which is a polypropylene-based modified resin having a melting point of 121 ° C. by DSC. Modick (registered trademark) “P614V” was used, and a substrate layer and an adhesive layer with respective thicknesses of 27 ⁇ m and 3 ⁇ m were laminated and composited by the T-die method to produce a material that does not exhibit tackiness at room temperature. Table 1 shows the results of thermal bonding of this insulating film to an aluminum foil as a positive electrode current collector foil at 150 ° C.
- Example 2 Table 1 shows the results of manufacturing a lithium ion secondary battery under the same conditions as in Example 1 except that the base layer of the insulating film was changed to a block PP having a melting point by DSC of 161 ° C. In addition, what was carried out under these conditions also had sufficient adhesive strength with the aluminum foil, and there was no peeling at the time of cutting or deterioration in battery performance, but there was a slight tendency to fuse to the seal bar. It was. This insulating film also does not exhibit adhesiveness at room temperature, and in Examples 3 to 9 and Comparative Example 1 shown below, the insulating film does not exhibit adhesiveness at room temperature.
- Example 3 The result of manufacturing a lithium ion secondary battery under the same conditions as in Example 1 except that the adhesive layer of the insulating film was changed to Modic (registered trademark) P555 made by Mitsubishi Chemical, which is a modified resin having a melting point of 161 ° C. by DSC Is shown in Table 1.
- Modic registered trademark
- P555 a modified resin having a melting point of 161 ° C. by DSC Is shown in Table 1.
- Example 4 Table 1 shows the results of manufacturing a lithium ion secondary battery under the same conditions as in Example 1 except that the thermal bonding temperature between the insulating film and the aluminum foil as the positive electrode current collector foil was set to 170 ° C. In addition, what was carried out under these conditions had sufficient adhesive strength with the aluminum foil, and there was no peeling at the time of cutting or deterioration in battery performance, but there was a slight tendency to fuse to the seal bar. It was.
- Example 5 Table 1 shows the results of manufacturing a lithium ion secondary battery under the same conditions as in Example 1 except that the thermal bonding temperature between the insulating film and the aluminum foil as the positive electrode current collector foil was set to 130 ° C. In addition, what was carried out under these conditions was not peeled off at the time of cutting or fused with the seal bar, and there was no deterioration in battery performance, but a tendency to slightly lower the adhesive strength with the aluminum foil was seen .
- Example 6 Table 1 shows the results of manufacturing a lithium ion secondary battery under the same conditions as in Example 1 except that the base layer of the insulating film was changed to EPC having a melting point of 140 ° C. by DSC. In addition, what was carried out under these conditions had sufficient adhesive strength with the aluminum foil, and there was no peeling at the time of cutting or deterioration in battery performance, but there was a slight tendency to fuse to the seal bar. It was.
- Example 7 Table 1 shows the results of producing a lithium ion secondary battery under the same conditions as in Example 1 except that the same insulating film as in Example 3 was used and the thermal bonding temperature was set to 170 ° C. In addition, what was carried out under these conditions had sufficient adhesive strength with the aluminum foil, and there was no peeling at the time of cutting or deterioration in battery performance, but there was a slight tendency to fuse to the seal bar. It was.
- Example 8 Table 1 shows the results of manufacturing a lithium ion secondary battery under the same conditions as in Example 1 except that the same insulating film as in Example 6 was used and the thermal bonding temperature was set to 130 ° C. In addition, what was carried out under these conditions was not peeled off at the time of cutting or fused with the seal bar, and there was no deterioration in battery performance, but a tendency to slightly lower the adhesive strength with the aluminum foil was seen .
- Example 9 The results of manufacturing a lithium ion secondary battery under the same conditions as in Example 1 except that the same base layer resin and adhesive layer resin as in Example 1 were used, and insulating films having respective layer thicknesses of 29 ⁇ m and 1 ⁇ m were used. Table 1 shows. In addition, although what was implemented on these conditions did not peel at the time of a cutting
- Table 1 shows the results of manufacturing a lithium ion secondary battery under the same conditions as in Example 1 except that an unmodified EPC resin was laminated on the same base layer resin as in Example 1. In addition, what was implemented on this condition was 0.2 N / 15mm of adhesive strength with aluminum foil, the adhesive strength with aluminum foil was very low, and peeling occurred at the time of cutting.
- a lithium ion secondary battery with stable performance was produced by thermally bonding a thermally adhesive insulating film to an aluminum foil without attaching an adhesive to the cutter.
- the adhesive tape was applied by pulling the tape onto the end face of the electrode active material and pressing it with an application roll.
- Adhesive tape has a tackiness (adhesiveness) when pulling out the tape, and there is a limit to the speed at which the tape can be pulled out. It was easy to occur. Moreover, there were many things with the short winding length of an adhesive tape, and there were many work losses of the replacement
- the secondary battery and the manufacturing method thereof according to the present invention can be used as a lithium ion secondary battery or the like.
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Abstract
Description
まず、正極集電箔10(図3(A))に、正極活物質11を塗布、乾燥させ、正極活物質11の端部を覆うように熱接着性絶縁フィルム13を140℃から160℃の温度で熱接着する。この際、熱接着性絶縁フィルム13を接着せずに正極集電箔10の表面が露出する部分を残す(図3(B))。次に、上述した第一の領域とリード部12を残してカッター等で切断することで、正極部材1を成形する(図3(C))。熱接着性絶縁フィルム13は常温でタック性(粘着性)を示さない絶縁材料から形成されているため、正極部材1の切断時にもカッターの刃等に熱接着性絶縁フィルム13が付着することがない。従って、カッターの刃等に異物が付着することが防止され、ひいては電池内への異物混入が効果的に防止される。
熱接着性絶縁フィルム13は、基材層(a)と接着層(b)からなる少なくとも2層以上の複合フィルムであって、基材層(a)は、電解液に溶解せず、電池の性能を低下させないためにはポリオレフィン樹脂が好ましい。ポリオレフィン樹脂の代表的なものとしてはポリエチレンやポリプロピレン(PP)などがあるが、熱板式のヒートシーラーで熱接着をするときに基材層が熱板に融着しないために基材層(a)と接着層(b)の融点が(a)≧(b)であることが好ましく、基材層(a)は融点が高いポリプロピレン樹脂が好ましい。ポリプロピレン樹脂とはプロピレンの単独重合体であるホモのポリプロピレン樹脂(以下、ホモPPと略称することがある。)や、エチレンを共重合したランダムコポリマー樹脂(以下、EPCと略称することがある。)、ポリプロピレンの重合時にエチレン・プロピレン共重合体のエラストマー成分を分子レベルでブレンドしたブロックコポリマー樹脂(以下、ブロックPPと略称することがある。)が例示される。EPC樹脂の融点は140℃前後であり、ホモPPとブロックPPの融点は160℃から165℃である。熱接着温度が140℃から160℃で熱板に融着しないためには、基材層のポリプロピレン樹脂はホモPPかブロックPPがより好ましい。
図3に示した製造過程に従って、正極集電箔に圧延アルミ箔を、負極集電箔に電解銅箔をそれぞれ使用してリチウムイオン二次電池を製造した。正極活物質は、遷移金属リチウム酸としてLiMn2O4を主成分にポリフッ化ビニリデン(PVDF)をバインダとしたものをアルミ箔上に塗布し乾燥させ、ロールプレスして形成した。負極活物質は、グラファイトを主成分にポリフッ化ビニリデンをバインダとしたものを電解銅箔上に塗布し乾燥させ、ロールプレスして形成した。電解液はジエチルカーボネートとエチレンカーボネートを主成分とした混合液を溶媒とし、電解質塩LiPF6を溶解したものを使用した。なお、絶縁フィルムをアルミ箔に接着した部分を2mm幅で切り出し、絶縁フィルムとアルミ箔間の接着力を、オリエンテック社製テンシロンを使用して300mm/分の引張速度で測定し、15mm幅の値に換算した。また、絶縁フィルムの熱接着時の目視による観察により、シールバーとの粘着の有無を判断し、集電箔をカッターで切断した際のカッターの刃を目視観察してカッターの刃への粘着剤の付着の有無を判断した。
絶縁フィルムの基材層を、DSCによる融点が161℃であるブロックPPに変更した以外は実施例1と同じ条件でリチウムイオン二次電池を製造した結果を表1に示す。なお、この条件で実施したものも、アルミ箔との接着力が十分であり、切断時の剥がれや電池性能の低下もないものであったが、若干ながらシールバーへ融着する傾向が見られた。なお、この絶縁フィルムも常温で粘着性を示さないものであり、以下に示す実施例3~9および比較例1についても、絶縁フィルムは常温で粘着性を示さないものであった。
絶縁フィルムの接着層を、DSCによる融点が161℃の変性樹脂である三菱化学製のモディック(登録商標)P555に変更した事以外は実施例1と同じ条件でリチウムイオン二次電池を製造した結果を表1に示す。なお、この条件で実施したものは、切断時の剥がれやシールバーとの融着はなく、電池性能の低下もないものであったが、アルミ箔との接着力が若干低い傾向が見られた。
絶縁フィルムと正極集電箔であるアルミ箔との熱接着温度を170℃とした以外は実施例1と同じ条件でリチウムイオン二次電池を製造した結果を表1に示す。なお、この条件で実施したものは、アルミ箔との接着力が十分であり、切断時の剥がれや電池性能の低下もないものであったが、若干ながらシールバーへ融着する傾向が見られた。
絶縁フィルムと正極集電箔であるアルミ箔との熱接着温度を130℃とした以外は実施例1と同じ条件でリチウムイオン二次電池を製造した結果を表1に示す。なお、この条件で実施したものは、切断時の剥がれやシールバーとの融着はなく、電池性能の低下もないものであったが、アルミ箔との接着力が若干低い傾向が見られた。
絶縁フィルムの基材層を、DSCによる融点が140℃であるEPCに変更したこと以外は実施例1と同じ条件でリチウムイオン二次電池を製造した結果を表1に示す。なお、この条件で実施したものは、アルミ箔との接着力が十分であり、切断時の剥がれや電池性能の低下もないものであったが、若干ながらシールバーへ融着する傾向が見られた。
実施例3と同じ絶縁フィルムを用い、熱接着温度を170℃とした以外は実施例1と同じ条件でリチウムイオン二次電池を製造した結果を表1に示す。なお、この条件で実施したものは、アルミ箔との接着力が十分であり、切断時の剥がれや電池性能の低下もないものであったが、若干ながらシールバーへ融着する傾向が見られた。
実施例6と同じ絶縁フィルムを用い、熱接着温度を130℃とした以外は実施例1と同じ条件でリチウムイオン二次電池を製造した結果を表1に示す。なお、この条件で実施したものは、切断時の剥がれやシールバーとの融着はなく、電池性能の低下もないものであったが、アルミ箔との接着力が若干低い傾向が見られた。
実施例1と同じ基材層樹脂と接着層樹脂で、それぞれの層の厚みを29μmと1μmにした絶縁フィルムを用いた以外は実施例1と同じ条件でリチウムイオン二次電池を製造した結果を表1に示す。なお、この条件で実施したものは、切断時の剥がれやシールバーとの融着はなく、電池性能の低下もないものであったが、アルミ箔との接着力にバラツキが見られた。
実施例1と同じ基材層樹脂に、変性をしていないEPC樹脂を積層し、それ以外は実施例1と同じ条件でリチウムイオン二次電池を製造した結果を表1に示す。なお、この条件で実施したものは、アルミ箔との接着力が0.2N/15mmであり、アルミ箔との接着力非常に低く、切断時に剥がれが生じた。
厚み20μmの二軸延伸ポリプロピレンフィルムに5μmのアクリル系粘着剤を塗布した粘着テープを用い、室温で圧着して接着した以外は実施例1と同じ条件でリチウムイオン二次電池を製造した結果を表1に示す。なお、この条件で実施したものは、アルミ箔との接着力に問題は無いレベルであったが、切断時に粘着剤の付着や電池の性能が低下する傾向が見られた。
2 負極部材
3 セパレータ部材
4 端子部材
5 接続部
6 絶縁樹脂層
7 外装体
10 集電箔
11 活物質
12 リード部
13 熱接着性絶縁フィルム
Claims (12)
- 正極部材、セパレータ部材および負極部材をこの順序で積層した電極体を外装体内に格納した二次電池であって、前記正極部材および前記負極部材はそれぞれ、集電体と、該集電体上の一端側を覆うように形成された活物質層とからなり、常温で粘着性を示さない絶縁材料からなる絶縁体が、前記正極部材または前記負極部材を構成する集電体上に1N/15mm以上の接着力にて貼付され、前記正極部材または前記負極部材の周縁が、前記集電体と前記絶縁体とを含む切断面を有することを特徴とする二次電池。
- 前記集電体上の他端側に端子部材が接続され、該端子部材の一部が前記外装体の外部に露出している、請求項1に記載の二次電池。
- 前記絶縁体が熱接着性絶縁フィルムからなる、請求項1または2に記載の二次電池。
- 前記熱接着性絶縁フィルムが、ポリオレフィンからなる基材層と、不飽和カルボン酸またはその誘導体を用いて変性されたポリオレフィンからなる熱接着層を有する、請求項3に記載の二次電池。
- 前記基材層がポリプロピレンからなり、前記熱接着層が不飽和カルボン酸またはその誘導体を用いて変性されたポリプロピレンからなる、請求項4に記載の二次電池。
- 前記絶縁体が、前記集電体の露出面と前記活物質層との境界を覆うように熱接着されている、請求項1~5のいずれかに記載の二次電池。
- 前記外装体内にリチウムイオンを含有する電解液が注入されている、請求項1~6のいずれかに記載の二次電池。
- 前記絶縁体が前記正極部材を構成する集電体上に貼付され、該集電体がアルミニウムからなる、請求項1~7のいずれかに記載の二次電池。
- 正極部材、セパレータ部材および負極部材をこの順序で積層した電極体を外装体内に格納した二次電池であって、前記正極部材および前記負極部材はそれぞれ、集電体と、該集電体上の一端側を覆うように形成された活物質層とを有し、絶縁体が少なくとも、前記正極部材または前記負極部材を構成する集電体上に熱接着され、前記正極部材または前記負極部材は、少なくとも前記集電体と前記絶縁体とを含む切断面を有することを特徴とする二次電池。
- 正極部材、セパレータ部材および負極部材をこの順序で積層した電極体を外装体内に格納した二次電池の製造方法であって、活物質を箔上に塗布することにより該箔の一端側を覆う活物質層を形成し、絶縁体を少なくとも前記箔の露出面に接着した後に、切断面が前記絶縁体を含むように前記箔を切断することによって前記正極部材または前記負極部材を形成し、前記箔を端子部材の一端と接続し、該端子部材の他端が前記外装体から露出するように前記電極体を前記外装体内に格納することを特徴とする二次電池の製造方法。
- 前記絶縁体を前記活物質層と前記箔の露出面との境界を覆うように接着した後に、切断面が前記絶縁体と前記活物質層とが積層された部位を含むように前記箔を切断することによって前記正極部材または前記負極部材を形成し、前記外装体内に電解液を注入する、請求項10に記載の二次電池の製造方法。
- 正極部材、セパレータ部材および負極部材をこの順序で積層した電極体を外装体内に格納した二次電池において、前記正極部材および負極部材がそれぞれ、集電箔と、該集電箔上の一端を覆うように形成された活物質層とからなり、前記正極部材あるいは前記負極部材の少なくとも前記箔の露出部分に熱接着により貼付された後に、前記箔および活物質と共に切断される絶縁フィルムであって、基材層と接着層の少なくとも2層からなる積層フィルムであり、基材層がポリオレフィン樹脂からなり、接着層が不飽和カルボン酸又はその誘導体を用いて変性されたポリオレフィン樹脂からなる絶縁フィルム。
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