JP2019021495A - Perforated metal foil - Google Patents
Perforated metal foil Download PDFInfo
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- JP2019021495A JP2019021495A JP2017138768A JP2017138768A JP2019021495A JP 2019021495 A JP2019021495 A JP 2019021495A JP 2017138768 A JP2017138768 A JP 2017138768A JP 2017138768 A JP2017138768 A JP 2017138768A JP 2019021495 A JP2019021495 A JP 2019021495A
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- 239000011888 foil Substances 0.000 title claims abstract description 76
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 69
- 239000002184 metal Substances 0.000 title claims abstract description 69
- 230000003746 surface roughness Effects 0.000 claims description 4
- 238000003860 storage Methods 0.000 abstract description 7
- 238000000576 coating method Methods 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000011149 active material Substances 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/04—Hybrid capacitors
- H01G11/06—Hybrid capacitors with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/68—Current collectors characterised by their material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/70—Current collectors characterised by their structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
本発明は、複数の開孔が設けられた開孔金属箔、特に、簡便、かつ、実用的なプレドープ技術に基づき製造することが可能な、高エネルギー密度、高出力特性を有する蓄電デバイス用電極及びその電極を具備する蓄電デバイスに関するものである。 The present invention relates to an apertured metal foil provided with a plurality of apertures, in particular, an electrode for an electricity storage device having a high energy density and a high output characteristic that can be manufactured based on a simple and practical pre-doping technique. And an electricity storage device including the electrode.
現在、蓄電デバイスの高出力、高エネルギー密度化が求められており、これに伴い、リチウムイオンキャパシタ(LIC)等の蓄電デバイスの開発が行なわれている。
その高出力、高エネルギー密度化の解決方法としてリチウム(Li)イオンを負極に担持するプレドープ技術が注目を集めている。
そのなかでも貫通孔を持つ金属箔を電極用集電体、集電芯体として用いることで簡便、かつ、実用的なプレドープ技術に基づいた蓄電デバイスを製造することができる。
この際、単位面積当たりの開孔面積の割合である開孔率は、プレドープの速度を速めるあるいはプレドープの均一性を高めるためには大きく設定することが好ましいが、集電体上への電極層形成の容易さ、電極強度の観点からは大きくしすぎるのは好ましくない。
Currently, there is a demand for higher output and higher energy density of power storage devices, and accordingly, power storage devices such as lithium ion capacitors (LIC) are being developed.
A pre-doping technique in which lithium (Li) ions are supported on a negative electrode is attracting attention as a solution for increasing the output and energy density.
Among these, by using a metal foil having a through hole as a current collector for an electrode and a current collector core, an electric storage device based on a simple and practical pre-doping technique can be manufactured.
At this time, the hole area ratio, which is the ratio of the hole area per unit area, is preferably set large in order to increase the speed of pre-doping or increase the uniformity of the pre-doping, but the electrode layer on the current collector From the viewpoints of ease of formation and electrode strength, it is not preferable to make it too large.
LICや次世代リチウムイオン電池(LIB)の正負極集電金属箔は、一般に、複数の開孔を設けた金属箔に活物質を塗布することによって作製され、例えば下記の特許文献1及び2には、図2のような、金属箔の幅方向の中央部分に、多数の孔を穿設した部分(開孔領域)が存在し、金属箔の長手方向の端縁部には、孔が設けられていない部分(無開孔領域)が存在している開孔金属箔が開示されている。
The positive and negative electrode current collector metal foil of LIC and next-generation lithium ion battery (LIB) is generally produced by applying an active material to a metal foil provided with a plurality of apertures. For example, in
ところで、図2のような、貫通孔を有する金属箔の場合、箔の端部に無開孔領域が存在することで長手方向に力がかかったときに箔の破断が防止され、機械内を通箔することができるが、長手方向に力がかかったときに開孔領域と無開孔領域の境目(境界線の位置)でねじれによる凹凸が発生するときがある。
これは、開孔領域では引っ張り強度が下がり、無開孔領域での引っ張り強度との差が生じて、ねじれが発生するためであり、開孔領域での開孔率が大きいほどその差は大きくなる。そして、そのねじれによる凹凸が、次の工程である活物質の塗工工程において塗工機械内での通箔の走行性に悪影響を与え、塗工性を損なうことになる。
By the way, in the case of a metal foil having a through hole as shown in FIG. 2, the presence of a non-perforated region at the end of the foil prevents the foil from being broken when a force is applied in the longitudinal direction. Although a foil can be passed, when a force is applied in the longitudinal direction, irregularities due to twisting may occur at the boundary between the open area and the non-open area (position of the boundary line).
This is because the tensile strength decreases in the open area, and a difference from the tensile strength in the non-open area occurs, resulting in torsion. The larger the hole area ratio in the open area, the greater the difference. Become. And the unevenness | corrugation by the twist will have a bad influence on the runability of the foil passing in a coating machine in the coating process of the active material which is the next process, and will impair coating property.
本発明は、上記課題に鑑み、蓄電デバイス用開孔金属箔において、引張環境下での端部無開孔領域−開孔領域(高開孔率領域)間での引っ張り強度の偏在を減らし、凹凸の高低差を抑えることができる開孔金属箔を提供することを目的とする。 In view of the above problems, the present invention reduces the uneven distribution of the tensile strength between the endless non-open region-the open region (high open area) in the tensile environment in the open metal foil for the electricity storage device, It is an object of the present invention to provide a perforated metal foil that can suppress unevenness of the unevenness.
本発明者等は、上記目的を達成するために検討を行った結果、金属開孔箔において、端部の無開孔領域と中央領域である高開孔率領域の間に、少なくとも1つ以上の低開孔率領域(中央領域にある開孔領域よりも開孔率が低い領域)を設定することにより、引張環境下での端部無開孔領域−高開孔率領域間での引っ張り強度の偏在を減らし、凹凸の高低差を抑えることができることを見出して、本発明を完成した。 As a result of studies conducted by the present inventors to achieve the above-described object, at least one or more between the non-open area at the end and the high open area at the center in the metal-perforated foil. By setting a low porosity area (area where the porosity is lower than that in the central area), pulling between the end non-open area and the high area ratio in a tensile environment The present invention has been completed by finding that the uneven distribution of strength can be reduced and the height difference of the unevenness can be suppressed.
上記課題を解決可能な本発明の開孔金属箔は、孔径0.36mm以上1.2mm以下の貫通孔が開孔率10%以上で形成されている少なくとも1つの第一開孔領域(高開孔率領域)と、前記第一開孔領域の開孔率よりも低い開孔率で前記貫通孔が形成されている少なくとも1つの第二開孔領域(低開孔率領域)と、貫通孔が設けられていない少なくとも1つの無開孔領域が、金属箔の幅方向に配列され、しかも、前記第一開孔領域、第二開孔領域及び無開孔領域がいずれも当該金属箔の長手方向と平行に延びており、前記第二開孔領域が前記第一開孔領域に隣接して配置されており、前記無開孔領域が前記第二開孔領域に隣接して配置されていることを特徴とする。
尚、本願明細書において「開孔率」とは、金属箔の長手方向に沿って延びる単位面積に占める、当該単位面積内に存在する複数の貫通孔の開孔面積の総和の割合、即ち、単位面積あたりの開孔面積の割合(開孔面積率)を意味するが、開孔面積は貫通孔の孔径と単位面積中の孔の数で決まるので、本発明における低開孔率とは孔径を小さくする、孔の数を減らすどちらで達成されてもよいし、複合でもかまわない。
The perforated metal foil of the present invention capable of solving the above-mentioned problems is at least one first perforated region (highly open) in which through-holes having a pore diameter of 0.36 mm or more and 1.2 mm or less are formed with an aperture ratio of 10% or more. A porosity region), at least one second aperture region (low aperture rate region) in which the through-hole is formed with an aperture rate lower than the aperture rate of the first aperture region, and a through-hole Are arranged in the width direction of the metal foil, and the first hole area, the second hole area, and the non-hole area are all in the longitudinal direction of the metal foil. The second aperture region is disposed adjacent to the first aperture region, and the non-perforated region is disposed adjacent to the second aperture region. It is characterized by that.
In the specification of the present application, “aperture ratio” means the ratio of the sum of the open areas of a plurality of through-holes existing in the unit area in the unit area extending in the longitudinal direction of the metal foil, This means the ratio of the open area per unit area (open area ratio). Since the open area is determined by the diameter of the through hole and the number of holes in the unit area, the low open area ratio in the present invention is the diameter of the hole. This may be achieved by reducing the number of holes, reducing the number of holes, or a composite.
又、本発明は、上記の特徴を有した開孔金属箔において、前記第二開孔領域が、前記第一開孔領域に比べて30〜70%の開孔率で形成されていることを特徴とするものである。 Further, according to the present invention, in the apertured metal foil having the above characteristics, the second aperture area is formed with an aperture ratio of 30 to 70% as compared with the first aperture area. It is a feature.
又、本発明は、上記の特徴を有した開孔金属箔において、前記第二開孔領域の幅が2mm以上50mm以下であることを特徴とするものである。 The present invention is also characterized in that, in the apertured metal foil having the above characteristics, the width of the second aperture region is 2 mm or more and 50 mm or less.
又、本発明は、上記の特徴を有した開孔金属箔において、前記金属箔の幅方向の少なくとも一方の端部に前記無開孔領域が設けられており、当該無開孔領域の幅が2mm以上50mm以下であることを特徴とするものでもある。 Further, the present invention provides an apertured metal foil having the above-described characteristics, wherein the apertureless region is provided at at least one end in the width direction of the metal foil, and the width of the apertureless region is It is also characterized by being 2 mm or more and 50 mm or less.
又、本発明は、上記の特徴を有した開孔金属箔において、前記金属箔の厚みが3μm〜50μmであることを特徴とするものである。 The present invention is also characterized in that, in the apertured metal foil having the above characteristics, the thickness of the metal foil is 3 μm to 50 μm.
又、本発明は、上記の特徴を有した開孔金属箔において、前記金属箔の表面粗さ(Ra,JIS B 0601:2001に準拠)が0.5μm以下であることを特徴とするものでもある。 Further, the present invention provides an apertured metal foil having the above characteristics, wherein the metal foil has a surface roughness (Ra, based on JIS B 0601: 2001) of 0.5 μm or less. is there.
開孔領域での引っ張り強度の低下は開孔率と相関があるため、高開孔率領域と無開孔領域との境界において引っ張り強度の差による力の偏在が発生し、それがねじれによる凹凸になるが、本発明の開孔金属箔においては、高開孔率領域と無開孔領域との間に低開孔率領域が配置されており、これにより、無開孔領域と低開孔率領域、低開孔率領域と高開孔率領域と開孔率の異なる領域同士の境界が増え、また境界における開孔率の差が小さくなるため偏在する力は小さくなり、凹凸の高低差を小さくすることができる。 Since the decrease in tensile strength in the open area correlates with the open area ratio, the uneven distribution of force occurs due to the difference in tensile strength at the boundary between the high open area area and the non-open area. However, in the apertured metal foil of the present invention, the low aperture rate region is disposed between the high aperture rate region and the non-perforated region. Area, low-permeability area, high-permeability area, and areas with different perforation ratios increase, and the difference in the area-to-percentage area becomes smaller, so the unevenly distributed force becomes smaller and the unevenness level Can be reduced.
本発明に係る開孔金属箔は、金属箔を加工により開孔部を設けた金属箔であり、以下、図1を参照して、本発明の実施の形態を説明するが、本発明は図面に例示したものに限定されるものではない。
図1は、第一開孔領域(高開孔率領域)1と無開孔領域3の間に第二開孔領域(低開孔率領域)2がある状態を模式的に表した平面図である。この際、開孔部の孔径、孔の配列は実際と異なり説明しやすいように大きく、単純化している。尚、第一開孔領域及び第二開孔領域に設けられる開孔は円形状のものが一般的であるが、これに限定されるものではない。
本発明の開孔金属箔の幅方向には、孔径0.36mm以上1.2mm以下の貫通孔が開孔率10%以上で形成されている少なくとも1つの第一開孔領域(高開孔率領域)1と、第一開孔領域2の開孔率よりも低い開孔率で貫通孔が形成されている少なくとも1つの第二開孔領域(低開孔率領域)2と、貫通孔が設けられていない少なくとも1つの無開孔領域3が配列されており、これら第一開孔領域1、第二開孔領域2及び無開孔領域3はいずれも当該金属箔の長手方向と平行な方向に延びている。
The perforated metal foil according to the present invention is a metal foil provided with a perforated portion by processing a metal foil. Hereinafter, an embodiment of the present invention will be described with reference to FIG. It is not limited to what was illustrated to.
FIG. 1 is a plan view schematically showing a state in which a second aperture region (low aperture rate region) 2 is present between a first aperture region (high aperture rate region) 1 and a non-apertured region 3. It is. At this time, the hole diameter and the arrangement of the holes are large and simplified for easy explanation, unlike the actual case. In addition, although the circular opening provided in a 1st opening area | region and a 2nd opening area | region is general, it is not limited to this.
In the width direction of the apertured metal foil of the present invention, at least one first aperture region (high aperture ratio) in which through holes having a aperture diameter of 0.36 mm to 1.2 mm are formed with an aperture ratio of 10% or more. Region) 1, at least one second aperture region (low aperture rate region) 2 in which a through hole is formed with an aperture ratio lower than the aperture ratio of the first aperture region 2, and the through hole At least one non-perforated region 3 which is not provided is arranged, and these first
そして、本発明の開孔金属箔においては、図1に示されるようにして、第二開孔領域2が第一開孔領域1に隣接して位置しており、無開孔領域3は、第一開孔領域1とは隣接せずに、第二開孔領域2と隣接するようにして配置されている。本発明では、開孔金属箔の両端縁部に無開孔領域3が配置されていることが好ましいが、両端縁部が第二開孔領域2であっても良い。
And in the apertured metal foil of this invention, as FIG. 1 shows, the 2nd aperture area | region 2 is located adjacent to the 1st aperture area |
本発明では、第一開孔領域1に設けられる開孔は、開孔率が10%以上であれば良いが、30%以上60%以下が好ましく、40%以上50%以下が特に好ましい。本発明において、貫通孔が形成された領域と無開孔領域との境界における凹凸の高低差を小さくするには、第二開孔領域2における開孔率を、第一開孔領域1の開孔率の30〜70%とすることが好ましい。
尚、第一開孔領域1と第二開孔領域2に開孔を設ける際の加工方法については特に限定されるものではなく、一般的なパンチングプレス、ロールパンチングプレス、エッチング、レーザー加工等がいずれも使用できる。
In the present invention, the aperture provided in the
In addition, it does not specifically limit about the processing method at the time of providing an opening in the 1st opening area |
本発明における第二開孔領域2及び無開孔領域3の幅(金属箔幅方向の長さ)は2mm〜50mmであることが好ましく、金属箔の幅方向の少なくとも一方の端部に形成されていることが好ましい。
本発明では、開孔金属箔の端部に第二開孔領域2が配置された構造であっても良いが、第二開孔領域2は、第一開孔領域1と無開孔領域3の間に配置されることが好ましい。
The width (length in the metal foil width direction) of the second open area 2 and the non-open area 3 in the present invention is preferably 2 mm to 50 mm, and is formed at at least one end in the width direction of the metal foil. It is preferable.
In the present invention, a structure in which the second aperture region 2 is disposed at the end portion of the apertured metal foil may be used, but the second aperture region 2 includes the
本発明の開孔金属箔の厚みは特に限定されるものではないが、LICやLIBの正負極集電金属箔として使用される開孔金属箔の厚みとしては3μm〜50μmが好ましく、当該金属箔の平均表面粗さ(Ra,JIS B 0601:2001に準拠)は特に限定されないが、0.5μm以下であることが好ましい。
又、本発明の開孔金属箔の材質はアルミニウム箔や銅箔やニッケル箔が一般的であるが、これに限定されるものではない。
The thickness of the apertured metal foil of the present invention is not particularly limited, but the thickness of the apertured metal foil used as the positive and negative electrode current collector metal foil of LIC or LIB is preferably 3 μm to 50 μm. The average surface roughness (based on Ra, JIS B 0601: 2001) is not particularly limited, but is preferably 0.5 μm or less.
The material of the apertured metal foil of the present invention is generally aluminum foil, copper foil or nickel foil, but is not limited thereto.
図1に示されるような、上記の第一開孔領域1、第二開孔領域2及び無開孔領域3が金属箔の幅方向に配列された本発明の開孔金属箔の場合、第一開孔領域1に隣接して第二開孔領域2が配置され、かつ、この第二開孔領域2に隣接して無開孔領域3が配置されることによって、隣接する領域の境界において引っ張り強度の差による力の偏在が発生しにくく、ねじれによる凹凸が生じにくく、偏在する力は小さくなり、凹凸の高低差を小さくすることができる。
次に、実施例に基づいて、本発明をより具体的に説明するが、本発明は実施例に限定されるものではない。
In the case of the apertured metal foil of the present invention in which the
Next, the present invention will be described more specifically based on examples, but the present invention is not limited to the examples.
開孔金属箔の製造
金属箔として、厚さ15μm、表面粗さ(Ra)0.2μmである銅箔を準備し、この銅箔にパンチング加工を行い、以下の表1に示す各開孔径、各開孔率、開孔領域を有する開孔金属箔をそれぞれ作製した。そして、当該開孔金属箔をそれぞれ310×1000mmの大きさに切断した。尚、上記開孔金属箔の幅方向の両端部にそれぞれ、幅5mmの無開孔領域が配置され、当該金属箔の幅方向中央に第一開孔領域が配置されるようにし、実施例1〜3における第二開孔領域の幅はいずれも5mmとした。
上記で作製した厚さ15μmの各開孔金属箔について、当該金属箔の片側を固定し、もう一方に3kgfの荷重をかけて張力を加え、その領域境界位置で発生した凹凸の高低差をセンサー(オムロン社製、スマートセンサ リニア近接タイプZX-Eシリーズφ8mm)を用いて測定した。その結果が、以下の表1に示されている。
Production of Open Metal Foil As a metal foil, a copper foil having a thickness of 15 μm and a surface roughness (Ra) of 0.2 μm was prepared, punching was performed on this copper foil, A perforated metal foil having each perforation ratio and perforated region was produced. Then, each of the perforated metal foils was cut into a size of 310 × 1000 mm. It should be noted that a non-perforated region having a width of 5 mm is disposed at both ends in the width direction of the perforated metal foil, and the first perforated region is disposed at the center in the width direction of the metal foil. The widths of the second aperture regions in .about.3 were all 5 mm.
For each apertured metal foil with a thickness of 15 μm produced above, one side of the metal foil is fixed, a load of 3 kgf is applied to the other, and a tension is applied. (Measured using a smart sensor linear proximity type ZX-E series φ8 mm, manufactured by OMRON Corporation). The results are shown in Table 1 below.
上記表1の結果より、低開孔率領域である第二開孔領域が存在しない比較例1〜3の金属箔の凹凸の高低差に比べて、第二開孔領域が存在する実施例1〜3の金属箔の凹凸の高低差は小さくなっており、第二開孔領域が設けることによって、領域間で発生する凹凸の高低差が低減され、活物質の塗工工程において塗工機械内での通箔の走行性が良く、塗工の均一性が高まることが確認された。 From the results of Table 1 above, the first example in which the second hole area is present as compared with the height difference of the unevenness of the metal foils of Comparative Examples 1 to 3 in which the second hole area that is the low hole area is not present. The height difference of the unevenness of the metal foil of 3 to 3 is small, and by providing the second aperture region, the unevenness of the unevenness generated between the regions is reduced, and in the coating process of the active material, It was confirmed that the runnability of the foil was good and the coating uniformity was improved.
本発明の開孔金属箔では、第一開孔領域と無開孔領域が隣接して配置されていないために、金属箔の幅方向に配置された開孔状態の異なる領域同士の境界位置に波打ち等が発生せず、金属箔の凹凸高低差を緩和できるので、特にLICやLIBの正負極集電金属箔の製造に有用である。 In the apertured metal foil of the present invention, since the first aperture region and the non-perforated region are not arranged adjacent to each other, at the boundary position between the regions having different aperture states arranged in the width direction of the metal foil. Since waviness or the like does not occur and the uneven height difference of the metal foil can be alleviated, it is particularly useful for producing positive and negative current collecting metal foils of LIC and LIB.
1 第一開孔領域(高開孔率領域)
2 第二開孔領域(低開孔率領域)
3 無開孔領域
1 First hole area (High hole area area)
2 Second hole area (low hole area)
3 Non-open area
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JP2013058354A (en) * | 2011-09-07 | 2013-03-28 | Toyota Industries Corp | Electrode for secondary battery |
WO2016158245A1 (en) * | 2015-03-31 | 2016-10-06 | 富士フイルム株式会社 | Aluminum plate, and current collector for power storage device |
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