JP2006344918A - Electrode material for electric double layer capacitor - Google Patents
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Abstract
Description
本発明は、電気二重層キャパシタ用電極材に関する。 The present invention relates to an electrode material for an electric double layer capacitor.
現在、電気二重層キャパシタは、様々な分野において用途開発が活発に行われている。特に、携帯電話やパソコンなどの各種電子機器のメモリバックアップ用電源として近年需要が増加している。また、電気自動車用バッテリーやモーターなどの補助電源として用いられるような、大容量を必要とされる用途に対する開発も望まれている。 Currently, electric double layer capacitors are actively being developed in various fields. In particular, the demand for memory backup power sources for various electronic devices such as mobile phones and personal computers has increased in recent years. In addition, development for applications requiring a large capacity, such as used as an auxiliary power source for electric vehicle batteries and motors, is also desired.
従来、電気二重層キャパシタは、２つの分極性電極間にセパレータを配置し、電解液を含浸して構成される。これらは、従来の二次電池と比較して急速な充放電が可能であり、出力密度が大きく、化学変化を伴わないため充放電の繰り返しによる劣化が少ないといった特長を有する。 Conventionally, an electric double layer capacitor is configured by disposing a separator between two polarizable electrodes and impregnating an electrolytic solution. These have the features that they can be charged / discharged more rapidly than conventional secondary batteries, have a high output density, and are less susceptible to repeated charge / discharge due to no chemical change.
一般に、電気二重層キャパシタ用電極は，集電体に活性炭などの炭素質材料を含有する電極層を積層させた構造を有している。また、電極層は、炭素質材料とバインダーからなるのが通常である。 Generally, an electrode for an electric double layer capacitor has a structure in which an electrode layer containing a carbonaceous material such as activated carbon is laminated on a current collector. The electrode layer is usually made of a carbonaceous material and a binder.
電気二重層キャパシタ用電極として、例えば特許文献１、２には、炭素質材料とバインダーをペースト状にしたものが提案されている。 As an electrode for an electric double layer capacitor, for example, Patent Documents 1 and 2 propose a paste made of a carbonaceous material and a binder.
また、特許文献３、４には、炭素質材料とＰＴＦＥ等のバインダーと液状潤滑剤とからなる混和物を予備成形した後、延伸または圧延してシート状にしたものが提案されている。 Patent Documents 3 and 4 propose a material obtained by preforming an admixture composed of a carbonaceous material, a binder such as PTFE, and a liquid lubricant, and then stretching or rolling the mixture.
さらに、特許文献５には、炭素質材料、ＰＴＦＥ及び加工助剤からなる混合物をスクリュー押出し成形し、押出し物を圧延ロールでシート状にしたものも開示されている。
一方、電解液には大きく分けて、硫酸水溶液あるいは水酸化カリウム水溶液のような水溶液系のものと、プロピレンカーボネート等の有機系極性溶媒に過塩素酸リチウムあるいは４級アンモニウム塩等の電解質を溶解させた有機系極性溶液系の２種類がある。容積当たりのエネルギーの高密度化という観点から、後者の有機系極性溶液系が積極的に使用されている。 On the other hand, the electrolyte is roughly divided into an aqueous solution such as a sulfuric acid aqueous solution or a potassium hydroxide aqueous solution, and an electrolyte such as lithium perchlorate or a quaternary ammonium salt dissolved in an organic polar solvent such as propylene carbonate. There are two types of organic polar solution systems. From the viewpoint of increasing the energy density per volume, the latter organic polar solution system is actively used.
ところで、例えばメモリバックアップ用電源として用いられるコイン型形状のものについては、プリント基板に実装後ハンダリフロー工程を通す必要がある。このハンダリフロー工程は温度が２６０℃と極めて高温であり、従来のような有機系極性溶液系を電解液として使用した場合、電解液がセル内で揮発しセルが膨張するという問題が生じる。また、電気自動車用バッテリーなどに使用される高容量タイプのものについては、車が事故等により炎上した場合、電解液に引火し被害が拡大するという危険がある。 By the way, for example, a coin-shaped one used as a memory backup power source needs to be subjected to a solder reflow process after being mounted on a printed circuit board. This solder reflow process has an extremely high temperature of 260 ° C., and when a conventional organic polar solution system is used as the electrolyte, there is a problem that the electrolyte volatilizes in the cell and the cell expands. In addition, for high-capacity type batteries used for electric vehicle batteries and the like, there is a risk that if the car burns up due to an accident or the like, the electrolyte will ignite and damage will increase.
これらの問題を解決するために、電解液にイオン性液体を使用する試みがなされている。イオン性液体とは、陽イオン（カチオン）と陰イオン（アニオン）とから成る塩で常温でも液体であるものをいい、例えば、カチオンとしては、イミダゾリウムイオンやピリジニウムイオンといった芳香族系アミンやテトラアルキルアンモニウムイオンといった脂肪族系アミンがあり、一方アニオンとしては、ＢＦ４ −、ＰＦ６ −、ＣＦ３ＳＯ３ −、（ＣＦ３ＳＯ２）２Ｎ−といった含フッ素系アニオンやＣｌ−、Ｂｒ−といったハロゲン系アニオンがある。これらイオン性液体は、高い電気伝導性を持ち、不揮発性であるためハンダリフロー工程でのセルの膨張や車両事故による電解液への引火等の危険性がない。In order to solve these problems, an attempt has been made to use an ionic liquid as an electrolytic solution. An ionic liquid refers to a salt composed of a cation (cation) and an anion (anion) that is liquid even at room temperature. For example, the cation includes aromatic amines such as imidazolium ions and pyridinium ions, and tetraions. There are aliphatic amines such as alkylammonium ions. On the other hand, examples of anions include fluorine-containing anions such as BF 4 − , PF 6 − , CF 3 SO 3 − and (CF 3 SO 2 ) 2 N − , Cl − and Br −. There are halogen anions. Since these ionic liquids have high electrical conductivity and are non-volatile, there is no danger of cell expansion in the solder reflow process or ignition of the electrolyte due to a vehicle accident.
しかしながら、電解液としてイオン性液体を使用しようとした場合、前述の特許文献１〜５にあるようなシート状電極では、バインダーとして用いるＰＴＦＥが、縦横にフィブリル化されることにより三次元的に細かな網目構造をとり、さらにＰＴＦＥが高い撥水・撥油性を有するために、イオン性液体が電極に吸収されないという問題が生じる。 However, when an ionic liquid is to be used as the electrolytic solution, in the sheet-like electrode as described in Patent Documents 1 to 5, the PTFE used as the binder is fibrillated in the vertical and horizontal directions to make it fine in three dimensions. As a result, the ionic liquid is not absorbed by the electrode due to the excellent network structure and the high water and oil repellency of PTFE.
本発明は、上述した従来の問題を解決すべくなされたものであり、電解液として用いるイオン性液体の吸収性を高めた、電気二重層キャパシタ用電極材を提供することを目的とする。 The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide an electrode material for an electric double layer capacitor with improved absorbability of an ionic liquid used as an electrolytic solution.
本発明者は、上記目的を達成すべく鋭意研究を重ねた結果、電気二重層キャパシタ用電極材製造における成形時に、電解液であるイオン性液体を成形助剤として用いることにより上記目的を達成できることを見出し、本発明を完成するに至った。 As a result of intensive studies to achieve the above object, the present inventor can achieve the above object by using an ionic liquid, which is an electrolytic solution, as a forming aid when forming an electrode material for an electric double layer capacitor. As a result, the present invention has been completed.
即ち、本発明は、下記の、電気二重層キャパシタ用電極材に関するものである。
１．活性炭、カーボンブラック、含フッ素重合体樹脂、イオン性液体を含むことを特徴とする電気二重層キャパシタ用電極材。
以下、本発明について詳細に説明する。That is, the present invention relates to the following electrode material for electric double layer capacitors.
1. An electrode material for an electric double layer capacitor, comprising activated carbon, carbon black, a fluoropolymer resin, and an ionic liquid.
Hereinafter, the present invention will be described in detail.
本発明の電気二重層キャパシタ用電極材は、活性炭、カーボンブラック、含フッ素重合体樹脂、イオン性液体を含むことを特徴とする The electrode material for an electric double layer capacitor of the present invention is characterized by containing activated carbon, carbon black, a fluoropolymer resin, and an ionic liquid.
活性炭は電極のエネルギー密度向上において重要な役割を果たし、その種類としては特に限定されるものではなく、フェノール系、レーヨン系、アクリル系、ピッチ系又はヤシガラ系等が使用でき、比表面積が３００〜３５００ｍ２／ｇ、さらには１５００〜２５００ｍ２／ｇのものが好ましく使用できる。粒子径は、０．１〜５０μｍ、好ましくは１〜３０μｍ、さらに好ましくは３〜１０μｍであると、薄膜成形がしやすく、容量密度を高くすることができる。Activated carbon plays an important role in improving the energy density of the electrode, and the type thereof is not particularly limited, and phenolic, rayon-based, acrylic-based, pitch-based or coconut shell-based can be used, and the specific surface area is 300 to 300. 3500 m 2 / g, more preferably be used those 1500~2500m 2 / g. When the particle diameter is 0.1 to 50 μm, preferably 1 to 30 μm, and more preferably 3 to 10 μm, thin film forming is easy and the capacity density can be increased.
カーボンブラックは電極に導電性を付与し、内部抵抗の低減に寄与するものであるため、アセチレンブラックやケッチェンブラック等の導電性に優れたものであれば良く、その粒子径としては、０．０１〜１μｍが好ましい。 Since carbon black imparts conductivity to the electrode and contributes to a reduction in internal resistance, it is sufficient that the carbon black has excellent conductivity, such as acetylene black or ketjen black. 01-1 micrometer is preferable.
含フッ素重合体樹脂は、シェア（剪断力）をかけるとフィブリル化する性質を有するもので、耐熱性等の観点から、ポリテトラフルオロエチレン（以下、ＰＴＦＥという。）等を用いることができる。ＰＴＦＥは、テトラフルオロエチレンの単独重合体だけではなく、テトラフルオロエチレンに対して他の単量体を０．５モル％以下加えて共重合させて得られる共重合体も含まれる。これら他の単量体としては、トリフルオロエチレン、（パーフルオロアルキル）エチレン、クロロトリフルオロエチレン、ヘキサフルオロプロピレン、パーフルオロ（アルキルビニルエーテル）等が挙げられる。 The fluoropolymer resin has a property of fibrillation when shear (shearing force) is applied, and polytetrafluoroethylene (hereinafter referred to as PTFE) or the like can be used from the viewpoint of heat resistance and the like. PTFE includes not only a homopolymer of tetrafluoroethylene but also a copolymer obtained by copolymerizing another monomer with 0.5 mol% or less of tetrafluoroethylene. Examples of these other monomers include trifluoroethylene, (perfluoroalkyl) ethylene, chlorotrifluoroethylene, hexafluoropropylene, and perfluoro (alkyl vinyl ether).
本発明において、含フッ素重合体樹脂の配合割合は、活性炭、カーボンブラック、含フッ素重合体樹脂混合物中の５〜２０重量％が好ましい。含フッ素重合体樹脂が５重量％未満では、成形後のシートの強度が弱く脆くなり、２０重量％を越えると電極の内部抵抗が大きくなる。 In the present invention, the blending ratio of the fluoropolymer resin is preferably 5 to 20% by weight in the activated carbon, carbon black, and fluoropolymer resin mixture. If the fluoropolymer resin is less than 5% by weight, the strength of the sheet after molding becomes weak and brittle, and if it exceeds 20% by weight, the internal resistance of the electrode increases.
本発明では、イオン性液体を成形助剤として用いる。イオン性液体は、カチオンとアニオンの組み合わせで多数の化合物があり、本発明では特に限定されるものではない。例えば、カチオンとしては、イミダゾリウムイオンやピリジニウムイオンといった芳香族系アミンやテトラアルキルアンモニウムイオンといった脂肪族系アミンが挙げられる。一方アニオンとしては、ＢＦ４ −、ＰＦ６ −、ＣＦ３ＳＯ３ −、（ＣＦ３ＳＯ２）２Ｎ−といった含フッ素系アニオンやＣｌ−、Ｂｒ−といったハロゲン系アニオンが挙げられる。具体的なイオン性液体としては例えば、１−Ｅｔｈｙｌ−３−ｍｅｔｈｙｌｉｍｉｄａｚｏｌｉｕｍｈｅｘａｆｌｕｏｒｏｐｈｏｓｐｈａｔｅ、１−Ｂｕｔｙｌ−３−ｍｅｔｈｙｌｉｍｉｄａｚｏｌｉｕｍ ｔｒｉｆｌｕｏｒｏｍｅｔｈａｎ ｓｕｌｆｏｎａｔｅ、１−Ｂｕｔｙｌ−３−ｍｅｔｈｙｌｉｍｉｄａｚｏｌｉｕｍ ｔｅｔｒａｆｕｌｕｏｒｏｂｏｒａｔｅ、１−Ｂｕｔｙｌ−３−ｍｅｔｈｙｌｉｍｉｄａｚｏｌｉｕｍ ｈｅｘａｆｌｕｏｒｏｐｈｏｓｐｈａｔｅ、１−Ｂｕｔｙｌ−３−ｍｅｔｈｙｌｉｍｉｄａｚｏｌｉｕｍ ｃｈｌｏｒｉｄｅ、１−Ｈｅｘｙｌ−３−ｍｅｔｈｙｌｉｍｉｄａｚｏｌｉｕｍ ｔｅｔｒａｆｕｌｕｏｒｏｂｏｒａｔｅ、１−Ｂｕｔｙｌｐｙｒｉｄｉｎｉｕｍ ｈｅｘａｆｌｕｏｒｏｐｈｏｓｐｈａｔｅ、１−Ｈｅｘｙｌｐｙｒｉｄｉｎｉｕｍ ｃｈｌｏｒｉｄｅ等が挙げられる。In the present invention, an ionic liquid is used as a molding aid. An ionic liquid has many compounds by the combination of a cation and an anion, and is not specifically limited by this invention. For example, examples of the cation include aromatic amines such as imidazolium ions and pyridinium ions and aliphatic amines such as tetraalkylammonium ions. On the other hand, examples of the anion include fluorine-containing anions such as BF 4 − , PF 6 − , CF 3 SO 3 − and (CF 3 SO 2 ) 2 N — and halogen-based anions such as Cl − and Br − . Specific ionic liquids include, for example, 1-Ethyl-3-methylimidazolium hexafluorophosphate, 1-Butyl-3-methylaluminium trifluoride 1-Butyl-3-methyl-disulfide, 1-Butyl-3 3-methylimidazolium chloride, 1-Hexyl-3-methylimidazolium tetrafuroborate, 1-Butylpyridinium hexafluorophosphate, 1- Hexylpyridinium chloride etc. are mentioned.
成形助剤として用いるイオン性液体は、電極材へのイオン性液体の含浸性能を高める観点から単体で用いるのが好ましいが、２種以上の混合物を用いることもできる。さらには、従来技術で用いられている、ＰＴＦＥを容易に湿潤させ、かつ成形後容易に除去できる成形助剤や加工助剤と混合して用いることもできる。具体的には、灯油、ソルベントナフサ等の炭化水素類、エチルアルコール、エチレングリコール、プロピレングリコール、グリセリン等が挙げられる。 The ionic liquid used as the molding aid is preferably used alone from the viewpoint of enhancing the impregnation performance of the ionic liquid into the electrode material, but a mixture of two or more kinds can also be used. Furthermore, PTFE used in the prior art can be mixed with a molding aid or a processing aid that can be easily wetted and easily removed after molding. Specific examples include hydrocarbons such as kerosene and solvent naphtha, ethyl alcohol, ethylene glycol, propylene glycol, and glycerin.
本発明において、イオン性液体の配合割合は、活性炭、カーボンブラック、含フッ素重合体樹脂混合物に対し、１〜３００重量％、好ましくは１０〜２５０重量％、さらに好ましくは５０〜２００重量％である。イオン性液体が１重量％未満では、その後の電解液としてのイオン性液体含浸時に電解液が吸収されないという問題が発生する。３００重量％を越えると電極材としての取扱いが困難になり、また、これ以上配合しても含浸性能の向上は見られない。 In the present invention, the blending ratio of the ionic liquid is 1 to 300% by weight, preferably 10 to 250% by weight, more preferably 50 to 200% by weight, based on the activated carbon, carbon black, and fluoropolymer resin mixture. . When the ionic liquid is less than 1% by weight, there is a problem that the electrolytic solution is not absorbed during the subsequent impregnation of the ionic liquid as the electrolytic solution. If it exceeds 300% by weight, it will be difficult to handle as an electrode material, and impregnation performance will not be improved even if blending more than this.
本発明において、イオン性液体を含む成形助剤としての配合割合は、イオン性液体の配合割合を満たしておれば特に限定されるものではない。使用する活性炭の種類や、成形方法に応じて適宜選択すればよい。 In the present invention, the blending ratio as the molding aid containing the ionic liquid is not particularly limited as long as the blending ratio of the ionic liquid is satisfied. What is necessary is just to select suitably according to the kind of activated carbon to be used, and a shaping | molding method.
本発明の電気二重層キャパシタ用電極材は、これらの各成分を均一に混合し、所定の形状に成形することによって得られる。成形方法は公知の方法を採用すれば良く、例えば押出し成形法、圧延成形法、錠剤成形法、プレス成形法を適用することができる。また、押出し成形後にさらに圧延成形を行うこともできる。 The electrode material for electric double layer capacitors of the present invention can be obtained by uniformly mixing these components and forming them into a predetermined shape. A known method may be employed as the molding method, and for example, an extrusion molding method, a rolling molding method, a tablet molding method, or a press molding method can be applied. Further, rolling forming can be further performed after the extrusion forming.
押出し成形法としては、一軸押出し機、多軸押出し機、ラム押出し機、スクリュー押出し機等を使用することができる。 As the extrusion molding method, a single screw extruder, a multi-screw extruder, a ram extruder, a screw extruder, or the like can be used.
本発明の電気二重層キャパシタ用電極材は、成形された後に必要により真空乾燥等の乾燥処理を行うこともできる。乾燥温度はＰＴＦＥの融点以下であればよく、具体的には１００〜３００℃が好ましい。この乾燥処理によって、イオン性液体と従来技術で用いられている成形助剤や加工助剤との混合物を用いて成形した場合には、イオン性液体以外の成形助剤や加工助剤は除去される。 The electrode material for an electric double layer capacitor of the present invention can be subjected to a drying treatment such as vacuum drying after being formed, if necessary. The drying temperature should just be below melting | fusing point of PTFE, and 100-300 degreeC is specifically preferable. By this drying treatment, when molding is performed using a mixture of an ionic liquid and a molding aid or processing aid used in the prior art, the molding aid or processing aid other than the ionic liquid is removed. The
本発明で得られた電極材は、そのまま電極として使用することができるが、必要に応じてさらに圧縮したり焼成してから使用してもよい。圧縮することにより電極材の密度を上げることができ、また焼成することにより電極材の強度を向上させることができる。 The electrode material obtained in the present invention can be used as an electrode as it is, but may be used after further compression or firing as required. The density of the electrode material can be increased by compression, and the strength of the electrode material can be improved by firing.
本発明の電気二重層キャパシタ用電極材によれば、電極材に既にイオン性液体が含まれているため、電解液としてイオン性液体を使用しようとした場合、電解液と電極材の親和性が良好であるため、電解液としてのイオン性液体が、電極材内部に容易に吸収される。また、この結果、イオン性液体を電解液とする電気二重層キャパシタの作製工程において、電解液の電極材への含浸時間が大幅に短縮され、生産性も向上する。 According to the electrode material for an electric double layer capacitor of the present invention, since the ionic liquid is already contained in the electrode material, when the ionic liquid is used as the electrolytic solution, the affinity between the electrolytic solution and the electrode material is low. Since it is good, the ionic liquid as the electrolytic solution is easily absorbed inside the electrode material. As a result, in the manufacturing process of the electric double layer capacitor using the ionic liquid as the electrolyte, the time for impregnation of the electrolyte with the electrode material is greatly shortened, and the productivity is improved.
以下に実施例及び比較例を示し、本発明をより具体的に説明する。但し、本発明は実施例に限定されない。 Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. However, the present invention is not limited to the examples.
実施例１
活性炭として比表面積２３００ｍ２／ｇ、平均粒径８μｍ（商品名「マックスソーブＭＳＰ−２０」関西熱化学株式会社製）８０重量％、カーボンブラック（商品名「デンカブラックＦＸ−３５」電気化学工業株式会社製）１０重量％、ＰＴＦＥ（商品名「ポリフロンＦ−２０１」ダイキン工業株式会社製）１０重量％からなる混合物にイオン性液体として、１−Ｂｕｔｙｌ−３−ｍｅｔｈｙｌｉｍｉｄａｚｏｌｉｕｍ ｔｅｔｒａｆｕｌｕｏｒｏｂｏｒａｔｅ（関東化学株式会社製）を活性炭、カーボンブラック、ＰＴＦＥの混合物に対し１４０重量％加え、均一に混ざるように十分に混合した。得られた混合物を二軸押出し機で押出し成形した後、圧延ロールでシート状に圧延成形し、厚さ６００μｍのシートを得た。Example 1
Specific surface area of 2300 m 2 / g as activated carbon, average particle size 8 μm (trade name “Maxsorb MSP-20” manufactured by Kansai Thermal Chemical Co., Ltd.) 80% by weight, carbon black (trade name “Denka Black FX-35” Denki Kagaku Kogyo Co., Ltd. 1% -Butyl-3-methylimidazolium tetrafuroborate (manufactured by Kanto Chemical Co., Ltd.) Was added to the mixture of activated carbon, carbon black, and PTFE in an amount of 140% by weight and mixed well so as to mix uniformly. The obtained mixture was extrusion-molded with a twin-screw extruder and then rolled into a sheet with a rolling roll to obtain a sheet having a thickness of 600 μm.
実施例２
イオン性液体として、１−Ｂｕｔｙｌ−３−ｍｅｔｈｙｌｉｍｉｄａｚｏｌｉｕｍ ｔｅｔｒａｆｕｌｕｏｒｏｂｏｒａｔｅ（関東化学株式会社製）を活性炭、カーボンブラック、ＰＴＦＥの混合物に対し５６重量％、成形助剤として、プロピレングリコール（和光純薬工業株式会社製 試薬一級）を活性炭、カーボンブラック、ＰＴＦＥの混合物に対し８４重量％加えたほかは実施例１と同様にして厚さ６００μｍのシートを得た。Example 2
As an ionic liquid, 1-Butyl-3-methylimidazolium tetrafluoroborate (manufactured by Kanto Chemical Co., Inc.) is 56% by weight based on a mixture of activated carbon, carbon black and PTFE, and propylene glycol (manufactured by Wako Pure Chemical Industries, Ltd.) as a molding aid. A sheet having a thickness of 600 μm was obtained in the same manner as in Example 1 except that 84% by weight of the first grade reagent was added to the mixture of activated carbon, carbon black, and PTFE.
得られたシートを１８０℃で１２時間真空乾燥し、シート状の電気二重層キャパシタ用電極材とした。このとき、プロピレングリコールは乾燥により完全に除去されていた。 The obtained sheet was vacuum-dried at 180 ° C. for 12 hours to obtain a sheet-like electrode material for an electric double layer capacitor. At this time, propylene glycol was completely removed by drying.
比較例１
成形助剤としてプロピレングリコール（和光純薬工業株式会社製 試薬一級）を活性炭、カーボンブラック、ＰＴＦＥの混合物に対し１４０重量％加えたほかは、実施例１と同様にして厚さ６００μｍのシートを得た。Comparative Example 1
A sheet having a thickness of 600 μm is obtained in the same manner as in Example 1 except that 140% by weight of propylene glycol (first grade reagent manufactured by Wako Pure Chemical Industries, Ltd.) is added as a molding aid to the mixture of activated carbon, carbon black, and PTFE. It was.
得られたシートを１８０℃で１２時間真空乾燥し、シート状の電気二重層キャパシタ用電極材とした。このとき、プロピレングリコールは乾燥により完全に除去されていた。 The obtained sheet was vacuum-dried at 180 ° C. for 12 hours to obtain a sheet-like electrode material for an electric double layer capacitor. At this time, propylene glycol was completely removed by drying.
比較例２
成形助剤として炭化水素系溶剤（商品名「アイソパーＭ」エクソンモービル株式会社製）を活性炭、カーボンブラック、ＰＴＦＥの混合物に対し１４０重量％加えたほかは、実施例１と同様にして厚さ６００μｍのシートを得た。Comparative Example 2
A thickness of 600 μm in the same manner as in Example 1 except that a hydrocarbon solvent (trade name “Isopar M” manufactured by ExxonMobil Co., Ltd.) was added as a molding aid by 140% by weight to the mixture of activated carbon, carbon black and PTFE. Got the sheet.
得られたシートを１８０℃で１２時間真空乾燥レ、シート状の電気二重層キャパシタ用電極材とした。このとき、炭化水素系溶剤は乾燥により完全に除去されていた。 The obtained sheet was vacuum-dried at 180 ° C. for 12 hours to obtain a sheet-like electrode material for an electric double layer capacitor. At this time, the hydrocarbon solvent was completely removed by drying.
試験例１
電気二重層キャパシタ用電極材に対する、電解液としてのイオン性液体の吸収性の評価を行った。Test example 1
The absorptivity of the ionic liquid as the electrolyte was evaluated for the electrode material for electric double layer capacitors.
実施例１〜２及び比較例１〜２で得られたシート状電気二重層キャパシタ用電極材を、ドライエアー置換されたグローブボックス中のホットプレート上に乗せ１３０℃に加熱した。これは、加熱によりどの程度吸収が促進されるかを評価するために設定した温度である。常温状態及び加熱状態のシート状電気二重層キャパシタ用電極材の上に、電解液としてイオン性液体１−Ｂｕｔｙｌ−３−ｍｅｔｈｙｌｉｍｉｄａｚｏｌｉｕｍ ｔｅｔｒａｆｕｌｕｏｒｏｂｏｒａｔｅ（関東化学株式会社製）を約０．０５ｍｌスポイトで滴下し、液滴が完全に吸収されるまでの時間を測定した。その結果を表１に示す。 The electrode material for sheet-like electric double layer capacitors obtained in Examples 1-2 and Comparative Examples 1-2 was placed on a hot plate in a glove box substituted with dry air and heated to 130 ° C. This is a temperature set to evaluate how much absorption is promoted by heating. An ionic liquid 1-Butyl-3-methylimidazolium tetraborate (manufactured by Kanto Chemical Co., Ltd.) is dropped on the electrode material for a sheet-shaped electric double layer capacitor in a normal temperature state and a heated state with an about 0.05 ml dropper as an electrolyte, The time until the droplet was completely absorbed was measured. The results are shown in Table 1.
表１の結果より、実施例１〜２の電極材は優れた吸収性を示し、イオン性液体を電解液とする電気二重層キャパシタ用電極材として優れた性能を発揮できることがわかる。 From the results in Table 1, it can be seen that the electrode materials of Examples 1 and 2 exhibit excellent absorbency, and can exhibit excellent performance as electrode materials for electric double layer capacitors using an ionic liquid as an electrolyte.
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