JP2002260961A - Separator for electronic double-layer capacitor - Google Patents
Separator for electronic double-layer capacitorInfo
- Publication number
- JP2002260961A JP2002260961A JP2001057308A JP2001057308A JP2002260961A JP 2002260961 A JP2002260961 A JP 2002260961A JP 2001057308 A JP2001057308 A JP 2001057308A JP 2001057308 A JP2001057308 A JP 2001057308A JP 2002260961 A JP2002260961 A JP 2002260961A
- Authority
- JP
- Japan
- Prior art keywords
- separator
- mass
- layer capacitor
- electric double
- inorganic powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- Y02E60/13—Energy storage using capacitors
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、水溶液系電解液を
用いた電気二重層コンデンサ用セパレータに関する。The present invention relates to a separator for an electric double layer capacitor using an aqueous electrolyte.
【０００２】[0002]
【従来の技術】従来、この種の電気二重層コンデンサ用
セパレータとしては、例えば、特開平３−２７８５１２
号公報に、ポリオレフィン系樹脂４０〜８０質量％と無
機微粉体６０〜２０質量％の混合物を溶融混合した後、
インフレーション成形法またはＴダイ押出成形法などに
よりフィルム状に成形し、このフィルム状成形物を樹脂
の融点以下の軟化温度に加熱した状態で、一軸または二
軸延伸することによって微孔性フィルムとしたセパレー
タが開示されている。このセパレータでは、ポリオレフ
ィン系樹脂としてポリプロピレン樹脂、無機微粉体とし
て珪藻土が好適であるとされている。また、特開平７−
２４０３４８号公報には、多孔性セパレータの微細孔内
にアモルファスシリカ粒子層またはアルミナ粒子層を形
成し、電解液を凝集させることにより、セパレータ中の
電解液を保持し、長期使用中にセパレータ中の電解液が
減少してコンデンサの内部抵抗が高くなり、容量が低下
する現象（ドライアップ）を抑制することを特徴とした
セパレータが開示されている。また、特開昭５０−６６
７６１号公報、特開昭６０−２５４７２１号公報、特開
昭６３−５４２０８号公報には、電解液をゲル化させ、
ゲル電解質とした電気二重層コンデンサが開示されてい
る。2. Description of the Related Art Conventionally, as a separator for an electric double layer capacitor of this type, for example, Japanese Patent Application Laid-Open No. 3-278512
Japanese Patent Application Publication No. JP-A-2005-115, after melt-mixing a mixture of 40 to 80% by mass of a polyolefin resin and 60 to 20% by mass of an inorganic fine powder,
Formed into a film by inflation molding or T-die extrusion molding, etc., and heated to a softening temperature equal to or lower than the melting point of the resin, and then uniaxially or biaxially stretched into a microporous film. A separator is disclosed. In this separator, polypropylene resin is suitable as the polyolefin resin, and diatomaceous earth is suitable as the inorganic fine powder. In addition, Japanese Patent Application Laid-Open
Japanese Patent No. 240348 discloses that an amorphous silica particle layer or an alumina particle layer is formed in the fine pores of a porous separator, and the electrolytic solution is aggregated to retain the electrolytic solution in the separator. A separator is disclosed which suppresses a phenomenon (dry-up) in which the electrolyte decreases, the internal resistance of the capacitor increases, and the capacity decreases. Also, Japanese Patent Application Laid-Open No. 50-66
No. 761, JP-A-60-254721 and JP-A-63-54208 disclose that an electrolytic solution is gelled,
An electric double layer capacitor using a gel electrolyte is disclosed.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、特開平
３−２７８５１２号のセパレータでは、ポリオレフィン
系樹脂と無機微粉体との間隙を延伸によって調整するた
め、セパレータの均一性や延伸による残留ひずみでの寸
法安定性に問題があった。また、無機微粉体の比表面積
が約１０ｍ２／ｇと小さいため、電解液の保持力が乏し
く、ドライアップを起こし易いという問題があった。ま
た、特開平７−２４０３４８号、特開昭５０−６６７６
１号、特開昭６０−２５４７２１号、特開昭６３−５４
２０８号のセパレータでは、電解液を凝集あるいはゲル
化させる方式のため、イオンの移動度が小さく、内部抵
抗が大きくなるという問題があった。本発明は、このよ
うな従来の問題点を解決すべく、水溶液系電解液を用い
た電気二重層コンデンサ用セパレータであって、電解液
保持能力が高く、ドライアップを抑制でき、コンデンサ
の長寿命化に寄与できる電気二重層コンデンサ用セパレ
ータを提供することを目的とする。However, in the separator disclosed in JP-A-3-278512, the gap between the polyolefin resin and the inorganic fine powder is adjusted by stretching. There was a problem with stability. In addition, since the specific surface area of the inorganic fine powder is as small as about 10 m 2 / g, there is a problem that the holding power of the electrolytic solution is poor and dry-up easily occurs. Also, JP-A-7-240348, JP-A-50-6676
No. 1, JP-A-60-254721, JP-A-63-54
In the separator of No. 208, there is a problem that the mobility of ions is small and the internal resistance is increased due to the method of coagulating or gelling the electrolytic solution. SUMMARY OF THE INVENTION The present invention provides a separator for an electric double layer capacitor using an aqueous electrolytic solution, which has a high electrolytic solution holding capacity, can suppress dry-up, and has a long service life for the capacitor. It is an object of the present invention to provide a separator for an electric double layer capacitor that can contribute to the realization of a capacitor.
【０００４】[0004]
【課題を解決するための手段】本発明の電気二重層コン
デンサ用セパレータは、上記目的を達成するべく、請求
項１に記載の通り、水溶液系電解液を用いた電気二重層
コンデンサ用セパレータにおいて、ポリオレフィン系樹
脂、無機粉体、可塑剤及び界面活性剤を混合した原料組
成物をシート状に押出成形後、前記可塑剤を除去して得
られるものであって、ポリオレフィン系樹脂２０〜８０
質量％と、比表面積１００〜４００ｍ２／ｇの無機粉体
８０〜２０質量％と、これら１００質量％に対して界面
活性剤０．５〜１０質量％で構成される厚さ２０〜２０
０μｍの多孔質シートとしたことを特徴とする。また、
請求項２記載の電気二重層コンデンサ用セパレータは、
請求項１記載の電気二重層コンデンサ用セパレータにお
いて、前記ポリオレフィン系樹脂はポリエチレンであ
り、前記無機粉体はシリカ粉体であることを特徴とす
る。According to a first aspect of the present invention, there is provided a separator for an electric double layer capacitor using an aqueous electrolyte solution, wherein the separator for an electric double layer capacitor according to the present invention comprises: A material composition obtained by mixing a polyolefin-based resin, an inorganic powder, a plasticizer, and a surfactant into a sheet and extruding the same, and then removing the plasticizer, is obtained.
% By mass, 80 to 20% by mass of an inorganic powder having a specific surface area of 100 to 400 m 2 / g, and a thickness of 20 to 20 composed of 0.5 to 10% by mass of a surfactant with respect to 100% by mass.
It is characterized in that it is a porous sheet of 0 μm. Also,
The separator for an electric double layer capacitor according to claim 2,
2. The separator for an electric double layer capacitor according to claim 1, wherein the polyolefin resin is polyethylene, and the inorganic powder is silica powder.
【０００５】[0005]
【発明の実施の形態】本発明の電気二重層コンデンサ用
セパレータを製造するには、まず、原料組成物として、
ポリオレフィン系樹脂、無機粉体、可塑剤と共に、電解
液に対する濡れ性を確保するために界面活性剤を添加し
た４者の混合物を用意する。次いで、該原料組成物を、
押出成形機を用いて加熱溶融混練しながらシート状に成
形後、前記可塑剤を抽出除去することによって得られ
る。BEST MODE FOR CARRYING OUT THE INVENTION In order to manufacture the separator for an electric double layer capacitor of the present invention, first, as a raw material composition,
A mixture of a polyolefin-based resin, an inorganic powder, and a plasticizer is prepared by adding a surfactant in order to ensure wettability to an electrolytic solution. Next, the raw material composition is
It is obtained by extracting and removing the plasticizer after forming into a sheet while heating and melting and kneading using an extruder.
【０００６】前記ポリオレフィン系樹脂としては、ポリ
エチレン、ポリプロピレン、ポリブテンおよびこれらの
共重合物あるいは混合物が使用される。特に、重量平均
分子量２００万以上の高密度ポリエチレンを使用すれ
ば、機械的強度の優れた多孔質シートを得ることが出来
る。また、重量平均分子量の異なる樹脂を混合使用する
ことも可能であり、例えば、重量平均分子量２００万以
上の高密度ポリエチレンと重量平均分子量２０万未満の
低密度ポリエチレンをブレンドして使用することもでき
る。As the polyolefin resin, polyethylene, polypropylene, polybutene, and copolymers or mixtures thereof are used. In particular, if high-density polyethylene having a weight average molecular weight of 2,000,000 or more is used, a porous sheet having excellent mechanical strength can be obtained. It is also possible to mix and use resins having different weight average molecular weights. For example, it is also possible to blend and use high density polyethylene having a weight average molecular weight of 2,000,000 or more and low density polyethylene having a weight average molecular weight of less than 200,000. .
【０００７】前記無機粉体としては、比表面積が１００
〜４００ｍ２／ｇのシリカ、アルミナ、チタニアから選
択される１種または２種以上が使用される。尚、比表面
積を１００〜４００ｍ２／ｇとするのは、１００ｍ２／
ｇ未満では、浸透性を維持する効果が小さく、ドライア
ップの抑制効果も小さいため好ましくなく、４００ｍ ２
／ｇ超えでは、粒子表面の活性度が高く、１次粒子の結
合力が大きくなって２次粒子の分散が著しく悪くなるた
め好ましくないからである。The inorganic powder has a specific surface area of 100
~ 400m2/ G of silica, alumina, titania
One or more selected ones are used. The specific surface
100-400m2/ G is 100m2/
If it is less than g, the effect of maintaining permeability is small, and
400m 2
/ G, the activity of the particle surface is high, and the
The resultant force became large and the dispersion of secondary particles became extremely poor.
This is not preferred.
【０００８】前記可塑剤としては、パラフィン系、ナフ
テン系等の工業用潤滑油、あるいはフタル酸ジオクチル
等のエステル系可塑剤が使用できる。As the plasticizer, an industrial lubricating oil such as paraffin or naphthene or an ester plasticizer such as dioctyl phthalate can be used.
【０００９】前記界面活性剤としては、アルキルスルホ
コハク酸塩やナフタリンスルホン酸塩ホルマリン縮合物
等のアニオン系、またはポリオキシエチレンアルキルエ
ーテル等のノニオン系の単独または混合物が使用でき
る。界面活性剤の添加量は、前記ポリオレフィン系樹脂
と無機粉体を合わせた１００質量％に対して、０．５〜
１０質量％とするのが好ましい。これは、０．５質量％
未満では、実質的な浸透性が得られないため好ましくな
く、１０質量％超えでは、界面活性剤が電解液中に溶け
出し、電極に付着してコンデンサの寿命低下につながる
ため好ましくないからである。As the surfactant, anionic ones such as alkylsulfosuccinates and formalin condensates of naphthalenesulfonates, and nonionic ones such as polyoxyethylene alkyl ethers or mixtures thereof can be used. The addition amount of the surfactant is 0.5 to 100% by mass of the polyolefin resin and the inorganic powder together.
It is preferably 10% by mass. This is 0.5% by mass
If it is less than 10% by mass, it is not preferable because substantial permeability cannot be obtained, and if it exceeds 10% by mass, the surfactant is undesirably dissolved in the electrolytic solution and adheres to the electrode, leading to a reduction in the life of the capacitor. .
【００１０】本発明のセパレータにおけるポリオレフィ
ン系樹脂と無機粉体の構成比率は、２０：８０〜８０：
２０（質量比）であることが必要である。これは、ポリ
オレフィン系樹脂が２０質量％未満（無機粉体が８０質
量％超え）では、ポリオレフィン系樹脂がセパレータ全
体に均一に分散できず機械的強度が弱くなるため好まし
くなく、ポリオレフィン系樹脂が８０質量％超え（無機
粉体が２０質量％未満）では、セパレータ中の無機粉体
の量が少なくなり、浸透性を維持する効果が小さくな
り、ドライアップを抑制する効果も小さくなるため好ま
しくないからである。The constituent ratio of the polyolefin resin and the inorganic powder in the separator of the present invention is 20:80 to 80:
It is necessary to be 20 (mass ratio). This is because when the polyolefin resin is less than 20% by mass (the inorganic powder exceeds 80% by mass), the polyolefin resin cannot be uniformly dispersed throughout the separator, and the mechanical strength is weak. When the content is more than 20% by mass (the content of the inorganic powder is less than 20% by mass), the amount of the inorganic powder in the separator decreases, the effect of maintaining the permeability decreases, and the effect of suppressing the dry-up decreases, which is not preferable. It is.
【００１１】本発明のセパレータの厚さは２０〜２００
μｍであることが好ましい。これは、２０μｍ未満で
は、セパレータ本来の機能である隔離効果が小さく、短
絡や寿命低下を招き易くなるため好ましくなく、２００
μｍ超えでは、セパレータの電気抵抗が高くなり、コン
デンサの内部抵抗が高くなるため好ましくないからであ
る。The separator of the present invention has a thickness of 20 to 200.
μm is preferred. If the thickness is less than 20 μm, the isolation function, which is the original function of the separator, is small, and short-circuiting and shortening of life are likely to occur.
If it exceeds μm, the electrical resistance of the separator increases and the internal resistance of the capacitor increases, which is not preferable.
【００１２】[0012]
【実施例】次に、本発明の実施例を比較例と共に説明す
る。尚、以下において部で示される配合量は質量部を意
味するものとする。 （実施例１）重量平均分子量２００万の高密度ポリエチ
レン樹脂粉体３０部と、比表面積２００ｍ２／ｇのシリ
カ粉体７０部に、鉱物オイル１００部と、アルキルスル
ホコハク酸塩５部を混合し、押出機で加熱溶融混練しな
がら、成形ロールにて加圧成形して厚さ１００μｍのシ
ートを得た。続いて、該シート中の可塑剤を有機溶媒で
抽出除去して加熱乾燥し、ポリエチレン樹脂３０質量％
と、比表面積２００ｍ ２／ｇのシリカ粉体７０質量％
と、これら１００質量％に対してアルキルスルホコハク
酸塩５質量％で構成される、厚さ１００μｍの多孔質セ
パレータを作製した。Next, examples of the present invention will be described together with comparative examples.
You. In the following, the amounts indicated in parts are parts by mass.
Shall taste. (Example 1) High density polyethylene having a weight average molecular weight of 2,000,000
30 parts of ren resin powder, specific surface area 200m2/ G of siri
70 parts of mosquito powder, 100 parts of mineral oil,
Mix 5 parts of succinate and do not heat and knead with an extruder.
Then, press forming with a forming roll to form a 100 μm thick
I got it. Subsequently, the plasticizer in the sheet is treated with an organic solvent.
Extraction removal, heating and drying, polyethylene resin 30% by mass
And specific surface area 200m 2/ G silica powder 70% by mass
And 100% by mass of these
100 μm thick porous cell composed of 5% by mass of acid salt
A parator was prepared.
【００１３】（実施例２）実施例１で使用したポリエチ
レン樹脂粉体５０部と、比表面積２００ｍ２／ｇのシリ
カ粉体５０部に、鉱物オイル１００部と、アルキルスル
ホコハク酸塩５部を混合し、実施例１と同様にしてポリ
エチレン樹脂５０質量％と、比表面積２００ｍ２／ｇの
シリカ粉体５０質量％と、これら１００質量％に対して
アルキルスルホコハク酸塩５質量％で構成される、厚さ
１００μｍの多孔質セパレータを作製した。(Example 2) 100 parts of mineral oil and 5 parts of alkyl sulfosuccinate were mixed with 50 parts of the polyethylene resin powder used in Example 1 and 50 parts of silica powder having a specific surface area of 200 m 2 / g. In the same manner as in Example 1, it is composed of 50% by mass of a polyethylene resin, 50% by mass of a silica powder having a specific surface area of 200 m 2 / g, and 5% by mass of an alkyl sulfosuccinate based on 100% by mass of these. A porous separator having a thickness of 100 μm was produced.
【００１４】（実施例３）実施例１で使用したポリエチ
レン樹脂粉体７０部と、比表面積２００ｍ２／ｇのシリ
カ粉体３０部に、鉱物オイル１００部と、アルキルスル
ホコハク酸塩５部を混合し、実施例１と同様にしてポリ
エチレン樹脂７０質量％と、比表面積２００ｍ２／ｇの
シリカ粉体３０質量％と、これら１００質量％に対して
アルキルスルホコハク酸塩５質量％で構成される、厚さ
１００μｍの多孔質セパレータを作製した。Example 3 70 parts of the polyethylene resin powder used in Example 1, 30 parts of silica powder having a specific surface area of 200 m 2 / g, 100 parts of mineral oil and 5 parts of alkyl sulfosuccinate were mixed. In the same manner as in Example 1, it is composed of 70% by mass of a polyethylene resin, 30% by mass of a silica powder having a specific surface area of 200 m 2 / g, and 5% by mass of an alkyl sulfosuccinate based on 100% by mass of these. A porous separator having a thickness of 100 μm was produced.
【００１５】（比較例１）実施例１で使用したポリエチ
レン樹脂粉体７０部と、比表面積１０ｍ２／ｇの珪藻土
３０部に、鉱物オイル１００部と、アルキルスルホコハ
ク酸塩５部を混合し、実施例１と同様にしてポリエチレ
ン樹脂７０質量％と、比表面積１０ｍ２／ｇの珪藻土３
０質量％と、これら１００質量％に対してアルキルスル
ホコハク酸塩５質量％で構成される、厚さ１００μｍの
多孔質セパレータを作製した。Comparative Example 1 70 parts of the polyethylene resin powder used in Example 1 and 30 parts of diatomaceous earth having a specific surface area of 10 m 2 / g were mixed with 100 parts of mineral oil and 5 parts of alkyl sulfosuccinate. 70% by mass of polyethylene resin and diatomaceous earth 3 having a specific surface area of 10 m 2 / g in the same manner as in Example 1.
A porous separator having a thickness of 100 μm and comprising 0% by mass and 5% by mass of the alkyl sulfosuccinate with respect to 100% by mass was produced.
【００１６】（比較例２）実施例１で使用したポリエチ
レン樹脂粉体１００部に、鉱物オイル１００部を混合
し、実施例１と同様にしてポリエチレン樹脂１００質量
％で構成される厚さ１００μｍの多孔質セパレータを作
製した。このセパレータをアルキルスルホコハク酸塩の
水溶液に浸漬して、セパレータ１００質量％に対して５
質量％付着処理した。Comparative Example 2 100 parts of mineral oil was mixed with 100 parts of the polyethylene resin powder used in Example 1 and 100% by mass of polyethylene resin was formed in the same manner as in Example 1 to have a thickness of 100 μm. A porous separator was produced. This separator was immersed in an aqueous solution of an alkyl sulfosuccinate, and the amount of the separator was 5% with respect to 100% by mass of the separator.
Mass% adhesion treatment was performed.
【００１７】次に、前記実施例１乃至３及び比較例１乃
至２のセパレータについて、浸透性保持力及び電気抵抗
変化率を測定し、セパレータを評価した。その結果を表
１に示す。尚、試験方法については、以下のようにし
た。Next, with respect to the separators of Examples 1 to 3 and Comparative Examples 1 and 2, the permeability retention force and the rate of change in electric resistance were measured, and the separators were evaluated. Table 1 shows the results. In addition, about the test method, it was as follows.
【００１８】［浸透性保持力］セパレータの電解液保持
能力の評価として、次のような試験を行った。セパレー
タを３０ｍｍ×３０ｍｍの寸法に切った試験片に重りを
付けて２００ｍｌの水中に浸漬し、７５℃の恒温槽内で
２４時間放置後、該試験片を８０℃にて乾燥した。続い
て、該試験片を比重１．２の硫酸水溶液の液面に浮か
べ、該試験片の下面から上面にまで硫酸が浸透してくる
までの時間を測定し、浸透性保持力（秒）とした。尚、
浸透性保持力は、この浸透時間が短いほど浸透性保持力
も高く良好である。[Permeability Retaining Power] The following test was conducted to evaluate the electrolytic solution retaining capability of the separator. A test piece in which the separator was cut into a size of 30 mm × 30 mm was weighted, immersed in 200 ml of water, left in a constant temperature bath at 75 ° C. for 24 hours, and then dried at 80 ° C. Subsequently, the test piece was floated on the surface of a sulfuric acid aqueous solution having a specific gravity of 1.2, and the time required for sulfuric acid to permeate from the lower surface to the upper surface of the test piece was measured. did. still,
As for the permeability retention power, the shorter the permeation time, the higher the permeability retention power and the better.
【００１９】［電気抵抗変化率］セパレータの抵抗変化
を測定するため、次のような試験を行った。セパレータ
を１００ｍｍ×１００ｍｍの寸法に切った試験片に重り
を付けて１０００ｍｌの水中に浸漬し、７５℃の恒温槽
内で２４時間放置後、該試験片を８０℃にて乾燥した。
続いて、該試験片を比重１．２の硫酸水溶液中に２４時
間浸漬した後、電池工業会規格ＳＢＡ Ｓ０４０２に準
拠して電気抵抗を測定し、これをＲ1とした。また、上
記した高温水中への浸漬処理を行わない試験片について
も、同様に電気抵抗を測定し、これをＲ2とした。得ら
れた２つの抵抗値から、Ｒ1／Ｒ2を求め、電気抵抗変化
率（倍）とした。尚、電気抵抗変化率は、処理前後の電
気抵抗変化率が小さいほど、電気二重層コンデンサ用セ
パレータとして内部抵抗変化が小さく、ドライアップを
抑制してコンデンサの長寿命化へ寄与できる。[Electrical Resistance Change Rate] The following test was performed to measure the resistance change of the separator. A test piece cut into a size of 100 mm x 100 mm was weighted with a separator, immersed in 1000 ml of water, left in a constant temperature bath at 75 ° C for 24 hours, and then dried at 80 ° C.
Then, after immersion for 24 hours in sulfuric acid aqueous solution having a specific gravity of 1.2 to the test piece, the electrical resistance was measured according to Battery Association Standard SBA S0402, which was used as R 1. As for the specimen does not perform immersion treatment in hot water as described above, similarly measuring the electrical resistance, which was used as a R 2. From the two obtained resistance values, R 1 / R 2 was obtained and defined as an electric resistance change rate (times). As for the rate of change in electrical resistance, the smaller the rate of change in electrical resistance before and after the treatment, the smaller the change in internal resistance as a separator for an electric double-layer capacitor, thereby suppressing dry-up and contributing to a longer life of the capacitor.
【００２０】[0020]
【表１】 [Table 1]
【００２１】表１から明らかなように、実施例のセパレ
ータでは、浸透性保持力、電気抵抗変化率とも良好であ
った。比較例のセパレータではいずれも、浸透性保持力
が悪化し、電気抵抗変化率も大きく、好ましくない結果
であった。As is evident from Table 1, the separators of the examples had good permeability retention and electric resistance change rates. In each of the separators of the comparative examples, the permeability retention was deteriorated and the rate of change in electric resistance was large, which was an undesirable result.
【００２２】[0022]
【発明の効果】本発明の電気二重層コンデンサ用セパレ
ータでは、ポリオレフィン系樹脂、無機粉体、可塑剤及
び界面活性剤を混合した原料組成物をシート状に押出成
形後、前記可塑剤を除去することによって多孔質シート
としているので、延伸操作による多孔質化が不要とな
り、セパレータの均一性や延伸による残留ひずみでの寸
法安定性が改善できる。また、界面活性剤を予め原料組
成物中に混合して多孔質シートを得ているので、界面活
性剤がセパレータ中に均一に分散し、シート全体にわた
り均一な浸透性を付与できる。また、ポリオレフィン系
樹脂と、比表面積の大きい無機粉体と、界面活性剤で構
成されているので、電解液の浸透性を長期にわたり良好
に維持できることから、電解液保持能力が高くなってド
ライアップを抑制でき、コンデンサの長寿命化に寄与で
きる。According to the separator for an electric double layer capacitor of the present invention, after the raw material composition obtained by mixing the polyolefin resin, the inorganic powder, the plasticizer and the surfactant is extruded into a sheet, the plasticizer is removed. Thus, since the porous sheet is used, it is not necessary to make the sheet porous by a stretching operation, and the uniformity of the separator and dimensional stability due to residual strain due to stretching can be improved. In addition, since the porous sheet is obtained by previously mixing the surfactant into the raw material composition, the surfactant is uniformly dispersed in the separator, and uniform permeability can be imparted to the entire sheet. In addition, since it is composed of a polyolefin resin, inorganic powder with a large specific surface area, and a surfactant, it is possible to maintain good electrolyte permeability over a long period of time. Can be suppressed, and the life of the capacitor can be extended.
Claims (2)
デンサ用セパレータにおいて、ポリオレフィン系樹脂、
無機粉体、可塑剤及び界面活性剤を混合した原料組成物
をシート状に押出成形後、前記可塑剤を除去して得られ
るものであって、ポリオレフィン系樹脂２０〜８０質量
％と、比表面積１００〜４００ｍ２／ｇの無機粉体８０
〜２０質量％と、これら１００質量％に対して界面活性
剤０．５〜１０質量％で構成される厚さ２０〜２００μ
ｍの多孔質シートとしたことを特徴とする電気二重層コ
ンデンサ用セパレータ。1. A separator for an electric double layer capacitor using an aqueous electrolytic solution, comprising: a polyolefin resin;
It is obtained by extruding a raw material composition obtained by mixing an inorganic powder, a plasticizer, and a surfactant into a sheet and removing the plasticizer. The polyolefin-based resin is 20 to 80% by mass, and has a specific surface area of 20 to 80% by mass. 100 to 400 m 2 / g inorganic powder 80
And a thickness of 20 to 200 μm composed of 0.5 to 20% by mass and 0.5 to 10% by mass of a surfactant with respect to 100% by mass.
A separator for an electric double layer capacitor, wherein the separator is a porous sheet having a thickness of m.
ンであり、前記無機粉体はシリカ粉体であることを特徴
とする請求項１記載の電気二重層コンデンサ用セパレー
タ。2. The separator for an electric double layer capacitor according to claim 1, wherein said polyolefin resin is polyethylene, and said inorganic powder is silica powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001057308A JP4842445B2 (en) | 2001-03-01 | 2001-03-01 | Electric double layer capacitor separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001057308A JP4842445B2 (en) | 2001-03-01 | 2001-03-01 | Electric double layer capacitor separator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002260961A true JP2002260961A (en) | 2002-09-13 |
| JP4842445B2 JP4842445B2 (en) | 2011-12-21 |
Family
ID=18917207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001057308A Expired - Fee Related JP4842445B2 (en) | 2001-03-01 | 2001-03-01 | Electric double layer capacitor separator |
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| Country | Link |
|---|---|
| JP (1) | JP4842445B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006137539A1 (en) | 2005-06-24 | 2006-12-28 | Nippon Sheet Glass Company, Limited | Method for producing porous silica ceramic |
| KR100836575B1 (en) | 2006-10-19 | 2008-06-10 | 주식회사 디지털텍 | Manufacturing method using micro-porous synthetic resin separator for aluminum polymer capacitor |
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| JPH01304933A (en) * | 1988-06-01 | 1989-12-08 | Toray Ind Inc | Polyolefin porous film and electrolysis separator |
| JPH076747A (en) * | 1993-06-15 | 1995-01-10 | Nippon Muki Co Ltd | Manufacture of battery separator and manufacturing equipment |
| JPH10100224A (en) * | 1996-09-30 | 1998-04-21 | Nippon Muki Co Ltd | Manufacture of separator for galvanic cell |
| JP2000277386A (en) * | 1999-03-23 | 2000-10-06 | Toyota Motor Corp | Electric double-layer capacitor separator and its manufacturing method |
| JP2001035754A (en) * | 1999-07-21 | 2001-02-09 | Oji Paper Co Ltd | Separator for electric double-layer capacitor |
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2001
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63108041A (en) * | 1986-06-12 | 1988-05-12 | Tokuyama Soda Co Ltd | Microporous film and production thereof |
| JPH01186752A (en) * | 1988-01-18 | 1989-07-26 | Toray Ind Inc | Hydrophilic polyolefin microporous membrane and cell separator |
| JPH01304933A (en) * | 1988-06-01 | 1989-12-08 | Toray Ind Inc | Polyolefin porous film and electrolysis separator |
| JPH076747A (en) * | 1993-06-15 | 1995-01-10 | Nippon Muki Co Ltd | Manufacture of battery separator and manufacturing equipment |
| JPH10100224A (en) * | 1996-09-30 | 1998-04-21 | Nippon Muki Co Ltd | Manufacture of separator for galvanic cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006137539A1 (en) | 2005-06-24 | 2006-12-28 | Nippon Sheet Glass Company, Limited | Method for producing porous silica ceramic |
| KR100836575B1 (en) | 2006-10-19 | 2008-06-10 | 주식회사 디지털텍 | Manufacturing method using micro-porous synthetic resin separator for aluminum polymer capacitor |
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| Publication number | Publication date |
|---|---|
| JP4842445B2 (en) | 2011-12-21 |
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