JP3038676B2 - Electric double layer capacitor - Google Patents

Electric double layer capacitor

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Publication number
JP3038676B2
JP3038676B2 JP6824788A JP6824788A JP3038676B2 JP 3038676 B2 JP3038676 B2 JP 3038676B2 JP 6824788 A JP6824788 A JP 6824788A JP 6824788 A JP6824788 A JP 6824788A JP 3038676 B2 JP3038676 B2 JP 3038676B2
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electric double
double layer
layer capacitor
activated carbon
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JPH01241811A (en )
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和也 平塚
広志 有賀
剛 森本
恭宏 真田
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エルナー株式会社
旭硝子株式会社
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors [EDLCs]; Processes specially adapted for the manufacture thereof or of parts thereof
    • H01G11/54Electrolytes
    • H01G11/58Liquid electrolytes
    • H01G11/62Liquid electrolytes characterised by the solute, e.g. salts, anions or cations therein
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors [EDLCs]; Processes specially adapted for the manufacture thereof or of parts thereof
    • H01G11/22Electrodes
    • H01G11/30Electrodes characterised by their materials
    • H01G11/32Carbon-based, e.g. activated carbon materials
    • H01G11/34Carbon-based, e.g. activated carbon materials characterised by carbonisation or activation of carbon
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/13Ultracapacitors, supercapacitors, double-layer capacitors

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は電気二重層コンデンサに関するものである。 DETAILED DESCRIPTION OF THE INVENTION [relates] The present invention relates to an electric double layer capacitor.

[従来の技術] 電気二重層コンデンサに従来用いられてきた分極性電極としては、活性炭、活性炭繊維等種々の素材があげられる。 The polarizable electrode which has been conventionally used in the prior art] electric double-layer capacitor, activated carbon, activated carbon fiber and the like various materials are exemplified.

活性炭を用いた例としては、活性炭の粉末を電解液と混合してペースト化して用いる電極が提案されている(特公昭55-41015号公報)。 As an example of using the activated carbon, powdered activated carbon was mixed with electrolyte electrode used in paste has been proposed (JP-B 55-41015 Patent Publication).

[発明の解決しようとする課題] しかしながら、このようなペースト電極に使用される活性炭の比表面積は、1500m 2 /g以下であり、この電極を用いたコンデンサは単位体積当りの容量が必ずしも十分ではなかった。 Resolution problem you attempt OF THE INVENTION However, the specific surface area of the activated carbon used in such paste electrode is a 1500 m 2 / g or less, the capacity per unit volume capacitor using this electrode is always sufficient There was no. また、活性炭の製造工程は、通常、原料の炭化・賦活の工程と粉砕工程とよりなり、原料の炭化・賦活には薬品賦活あるいはガス賦活の方法が適用されることが多い。 The step of producing the activated carbon is generally more becomes step and the grinding step of the raw material for carbonization and activation, the raw material for carbonization and activation is often the method of chemical activation or gas activation is applied. したがって、高比表面積を有する活性炭を得ようとする場合、高温度で長時間の賦活条件が要求されるため、反応工程中に反応容器からの重金属分が活性炭粉末中に混入して、得られる活性炭の純度が低下するという問題点があった。 Therefore, in order to obtain activated carbon having a high specific surface area, since the prolonged activation conditions at high temperatures is required, heavy metal content of the reaction vessel is mixed into the activated carbon powder in the reaction step, the resulting purity of activated carbon there is a problem of a decrease. さらに粉砕工程中に金属などの不純物が活性炭に混入することが少なくなかった。 Impurities such as metals were many be incorporated into the activated carbon during the further milling process. このため、従来の電気二重層コンデンサにおいては、分極性電極を形成する活性炭が多くの不純物を含有しており、特に高温度負荷条件下において、電解液中に金属その他の不純物が溶出して電気化学的反応を引起こすことによってコンデンサの長期信頼性が損なわれるという問題点があった。 Therefore, in the conventional electric double layer capacitor, activated carbon to form a polarizable electrode has contains many impurities, particularly at high temperatures stress conditions, electricity metals and other impurities in the electrolytic solution is eluted long-term reliability of the capacitor has a problem that impaired by causing a chemical reaction.

[課題を解決するための手段] 本発明者はこれら諸問題を解決することを目的として種々研究検討した結果、この様な活性炭に対し、他の成分を添加して悪影響を解決するよりも、前記不純物の許容量を特定化することにより、かえって安定した活性を長期にわたり持続し得る電極を得ることが可能になることを知見し、本発明の目的を達成し得ることを見出した。 The present inventors [Means for Solving the Problems] As a result of various studies investigated for the purpose of solving these problems, with respect to such activated carbon, than to solve the adverse effects by the addition of other ingredients, by specifying the allowable amount of the impurity, and found that is possible to obtain an electrode capable of sustained rather stable activity over time, we have found that it is possible to achieve the object of the present invention.

かくして本発明は、分極性電極と電解液の界面で形成される電気二重層を利用する電気二重層コンデンサにおいて、不純物であるFeが100ppm以下、Crが5ppm以下、Ni Thus, the present invention is the electric double layer capacitor utilizing an electric double layer formed at the interface of polarizable electrodes and an electrolytic solution, which is an impurity Fe is 100ppm or less, Cr is 5ppm or less, Ni
が5ppm以下、Naが150ppm以下、Kが100ppm以下、Clが10 There 5ppm or less, Na is 150ppm or less, K is 100ppm or less, Cl of 10
0ppm以下で、灰分が0.5%以下のヤシガラ活性炭よりなる分極性電極を用いることを特徴とする電気二重層コンデンサを提供するにある。 0ppm below is to provide an electric double layer capacitor, which comprises using a polarizable electrode ash and 0.5% or less of coconut shell activated carbon.

分極性電極に用いる活性炭の原料としてオガクズ等木質系、フェノール樹脂、ピッチ等樹脂系があるが、前者は1500m 2 /g以上の高比表面積を得ることは難しく、また不純物含有量も大きく、また後者は比表面積を上げることは容易であるが、コストが非常に割高となる欠点があり、本発明ではこれらの諸欠点を有さない原料としてヤシガラを用いる。 Sawdust and the like woody as a raw material of the activated carbon used for the polarized electrode, phenolic resin, there is a pitch or the like resin, the former it is difficult to obtain the above high specific surface area 1500 m 2 / g, and impurity content is large, also the latter is easy to increase the specific surface area, there is a drawback that the cost is very expensive, in the present invention using a coconut shell as a raw material which does not have these various drawbacks.

本発明で使用するヤシガラを原料とする活性炭が含有する不純物量としてはFeが100ppm以下、Crが5ppm以下、 The coconut shell for use in the present invention Fe is 100ppm or less as an impurity amount contained in the activated carbon used as a raw material, Cr is 5ppm or less,
Niが5ppm以下、Naが150ppm以下、Kが100ppm以下、Clが Ni is 5ppm or less, Na is 150ppm or less, K is 100ppm or less, Cl is
100ppm以下であり灰分が0.5%以下好ましくは0.4%以下である。 Is ash 0.5%, preferably at 100ppm or less 0.4% or less. 活性炭の不純物含有量が前記範囲を逸脱すると、長期信頼性に著しい悪影響を及ぼすので不適当である。 If impurity content of the activated carbon is outside the above range is unsuitable because Significant adverse effect on long-term reliability.

また活性炭の物性としては比表面積が1500〜1900m 2 /g As the physical properties of the activated carbon the specific surface area 1500~1900m 2 / g
好ましくは1650〜1850m 2 /gが適当である。 Preferably it is suitably 1650~1850m 2 / g.

これ以上の比表面積を有する活性炭を得ようとすると、収率が低下するので実際的ではない。 An attempt to obtain an activated carbon having a more specific surface area is not practical since the yield is lowered. 又、平均細孔径としては13〜20Å好ましくは14〜19Å、全細孔容積としては0.6〜0.9ml/g好ましくは0.65〜0.8ml/gであり、 Further, preferably 13~20Å the average pore diameter 14~19A, as the total pore volume 0.6~0.9ml / g preferably 0.65~0.8ml / g,
細孔径20Å以上の細孔の容積が全細孔容積に対して30〜 Pore ​​size 20Å or more of the pore volume is 30 with respect to the total pore volume
50%好ましくは35〜45%のものが好適である。 50% preferably is suitable that 35 to 45%.

本発明で用いる電極としては、この活性炭粉末を電解液と混合してペースト化したものを電極として用いることも可能である。 The electrode used in the present invention, it is also possible to use a material obtained by pasting the activated carbon powder is mixed with the electrolytic solution as an electrode. しかしながら、単位体積当りの容積と機械的強度のさらに良好な電極としては、ポリテトラフルオロエチレン(以下、PTFEと略称する)などの耐化学薬品性の優れた結着剤を用いて活性炭粉末をシート化してなる電極があげられる。 However, as the better electrode volume and mechanical strength per unit volume, polytetrafluoroethylene (hereinafter abbreviated as PTFE) of activated carbon powder with a good binder chemical resistance, such as sheet It turned into formed by the electrodes, and the like. このようなシート状電極としては、まず活性炭微粉末に対して好ましくは1〜50重量%、さらに好ましくは5〜30重量%の好ましくはPTFEを混合し、得られた粘稠な混合物を圧縮、押出し、もしくは圧延、またはこれらの手段を組合せることによってシート状に成形したものが好適に使用できる。 Examples of such a sheet-shaped electrode, initially preferably against the activated carbon fine powder 1 to 50 wt%, more preferably mixed with 5 to 30 wt% preferably PTFE, it compresses the viscous mixture obtained, extrusion or rolling, or those formed into a sheet by combining these means can be preferably used.

このシート状成形物は、さらに必要に応じて一軸方向、または二軸方向に延伸処理される。 The sheet-like molded product is stretched according to to need in a uniaxial direction or biaxial direction. この延伸処理は、20〜380℃好ましくは20〜200℃において、好ましくは原長の1.1〜5.0倍、特に好ましくは1.2〜2.0倍になるように公知の方法(たとえば、特開昭59-166541号公報)により行なわれる。 The stretching treatment at 20-380 ° C. Preferably 20 to 200 ° C., preferably from 1.1 to 5.0 times the original length, especially known methods so preferably be 1.2 to 2.0 times (e.g., JP 59-166541 is carried out by JP). このようにして得られた延伸処理物は、そのまま使用することもできるが、必要に応じて、さらにロール、プレスなどにより圧延または圧縮処理した後、焼成または半焼成処理して使用する。 Stretching treatment product were thus obtained, can be used as it is, if necessary, further roll after rolling or compressed by a press, using baking or semi-baking process to.

本発明で活性炭よりなる分極性電極と組合せて使用する電解液は特に限定されるものではなく、電気二重層コンデンサ用として使用可能なもの、すなわち、非水溶媒系または水溶液系電解液が適宜使用される。 Electrolyte solution to be used in combination with the polarizable electrode composed of activated carbon in the present invention is not limited in particular, usable for the electric double-layer capacitor, i.e., non-aqueous solvent or aqueous-based electrolyte solution suitably used It is.

本発明で活性炭よりなる分極性電極と組合せて使用される非水溶媒系電解液としては、たとえば過塩素酸、6 As the non-aqueous solvent electrolyte to be used in combination with polarized electrodes made of activated carbon in the present invention, for example perchloric acid, 6
フッ化リン酸、4フッ化ホウ酸、トリフルオロメタンスルホン酸などのテトラアルキルアンモニウム塩、テトラアルキルホスホニウム塩、またはアミン塩などの溶質を、プロピレンカーボネート、γ−ブチロラクトン、アセトニトリル、ジメチルホルムアミド、1,2−ジメトキシエタン、スルホラン、ニトロメタンなどの極性有機溶媒に0.3〜1.5M/l程度溶解させたものがあげられる。 Hexafluorophosphate, tetrafluoroborate acid, tetraalkylammonium salts, such as trifluoromethanesulfonic acid, tetraalkylphosphonium salts or solute, such as amine salts, propylene carbonate, .gamma.-butyrolactone, acetonitrile, dimethylformamide, 1,2 - dimethoxyethane, sulfolane, which is dissolved about 0.3 to 1.5 m / l in a polar organic solvent such as nitromethane and the like.

活性炭よりなる分極性電極と組合せて用いる水溶液系電解液としては、高い電気伝導性を有する無機酸、無機塩基、または無機塩を溶質とするものが好適である。 The aqueous electrolyte solution used in combination with the polarizable electrode made of activated carbon, an inorganic acid having a high electrical conductivity, an inorganic base or an inorganic salt which a solute, which is preferable. このような電解液の溶質(電解質)としては、たとえば硫酸、4フッ化ホウ酸、硝酸などの酸、水酸化カリウム、 Such electrolyte solute (electrolyte), such as sulfuric acid, tetrafluoroboric acid, such as nitric acid, potassium hydroxide,
水酸化ナトリウム、水酸化カルシウム、水酸化アンモニウムなどの塩基、塩化カリウム、塩化ナトリウム、塩化カルシウム、塩化アンモニウムなどの塩化物、炭酸カリウム、炭酸ナトリウム、炭酸カルシウム、炭酸アンモニウムなどの炭酸塩等が好適に使用される。 Sodium hydroxide, calcium hydroxide, bases such as ammonium hydroxide, potassium chloride, sodium chloride, calcium chloride, chlorides such as ammonium chloride, potassium carbonate, sodium carbonate, calcium carbonate, etc., preferably carbonates such as ammonium carbonate used. これらの電解質の中で、硫酸、4フッ化ホウ酸、水酸化カリウムおよび水酸化ナトリウムは、高い伝導度が得られる点で特に好ましい。 Among these electrolytes, sulfate, tetrafluoroborate, potassium hydroxide and sodium hydroxide are particularly preferable because high conductivity can be obtained.

水溶液系電解液の濃度は、10〜90重量%の範囲で適宜選定することができ、一般に90重量%以上の濃度になると寒冷時に溶質が析出するなどの問題が発生し、また10 The concentration of the aqueous electrolytic solution can be appropriately selected in the range of 10 to 90 wt%, generally such solute precipitated during cold when a concentration of more than 90% by weight problem occurs, also 10
重量%以下の濃度では、電導度が低下してコンデンサの内部抵抗を増大させるので好ましくない。 The weight percent of the concentration is not preferable because it increases the internal resistance of the capacitor conductivity is lowered.

前述のシート状物をコンデンサの形状に合せて加工・ Processed according to the aforementioned sheet to the shape of the capacitor
成形した電極間に多孔質のセパレータを挟み、前記のような電解液を含浸または満たしてケース中に密閉することによって本発明による電気二重層コンデンサが得られる。 Between molded electrodes sandwiching a separator of porous, electric double-layer capacitor can be obtained according to the present invention by sealing the electrolyte solution as described above during the impregnation or meets case.

多孔質セパレータとしては、たとえば、ポリプロピレン繊維不織布、ガラス繊維混抄不織布などが好適に使用できる。 As the porous separator, for example, polypropylene fiber nonwoven fabric, glass fiber mixed nonwoven fabric can be used suitably. また、セパレータの厚みは50〜200μmが適当であり、100〜150μmとするのが特に好適である。 The thickness of the separator is 50~200μm are suitable, it is particularly suitable for the 100-150 .mu.m.

また本発明で用いる分極性電極からの集電方法も特に限定されるものではなく、従来から周知、公知の方法が使用可能である。 The collector method from polarizable electrode used in the present invention is not particularly limited, conventionally known, known methods can be used. 例えば金属ケースに金属網を溶接しその上に電極を圧着したり、電極上にプラズマ溶射、メッキ等によって金属集電を形成したり、或は導電性接着剤によって接着する方法等が好ましく使用可能である。 For example, to weld the metal mesh bonding electrodes thereon in a metal casing, plasma spraying on the electrode, or forming a metal current collector by plating or the like, or a method in which adhesion by a conductive adhesive can be preferably used it is. 特に炭素質を含む導電性接着剤を用いる方法が好ましい。 Particularly preferred method of using a conductive adhesive containing carbonaceous.

本発明に用いられる導電性接着剤としては、バインダーをほとんど含まない高純度黒鉛系のものが好ましいが、フェノールなどの樹脂系バインダもしくは水ガラスなどの無機質バインダを含む黒鉛あるいはカーボンブラック系の導電性接着剤なども用いることができる。 The conductive adhesive used in the present invention is preferably of high purity graphite containing little binder, conductive graphite or carbon black system comprising an inorganic binder such as resin-based binder or a water glass, such as phenol adhesive or the like can also be used.

[実施例] 以下、本発明の実施例および比較例を図面を参照して具体的に説明する。 [Example] Hereinafter, Examples and Comparative Examples of the present invention with reference to the drawings will be described in detail.

第1表に示した各種のヤシガラ活性炭70重量%、カーボンブラック20重量%およびPTFE(粒子径0.3μm)10 Coconut shell activated carbon 70 wt% of various shown in Table 1, the carbon black 20 wt% and PTFE (particle size 0.3 [mu] m) 10
重量%よりなる粉末混合物100重量部に対して水200重量部を添加し、V形ブレンダー中で混和した。 Water 200 parts by weight added to the powder mixture 100 parts by weight consisting wt%, were mixed in a V-Blender. 得られたペースト状混和物をロール成形機を用いて圧延し、厚さ1. The resulting paste-like blend was rolled by a roll forming machine, thickness 1.
1mmのシートとした。 It was 1mm sheet. このシートを300℃に予熱した状態で一軸方向に1.1倍の倍率で延伸処理して厚さ0.6mmのシート状電極材料を得た。 This sheet was stretched at 1.1 times magnification in a uniaxial direction in a state preheated to 300 ° C. to obtain a sheet-form electrode material having a thickness of 0.6 mm.

このシート状電極材料を使用して第1図に示すようなコイン型電気二重層コンデンサのユニットセル(直径20 Unit cell of the coin-type electric double layer capacitor as shown in FIG. 1 using the sheet-like electrode material (diameter 20
mm、厚さ2.0mm)を下記の手順で作製した。 mm, to prepare a thickness 2.0 mm) by the following procedure.

前記シート状電極材料を円板状に打ち抜いて分極性電極1および2(直径15mm、厚さ0.6mm)とし、この分極性電極1、2をポリプロピレン繊維不織布よりなるセパレータ3を介してステンレス鋼製のキャップ4およびステンレス鋼製の缶5からなる外装容器中に収納する。 Polarizable electrode 1 and 2 (diameter 15 mm, thickness 0.6 mm) by punching the sheet electrode material in a disk shape and then, stainless steel through a separator 3 the polarizable electrode 2 made of polypropylene fiber nonwoven housed in the outer container consisting of a cap 4 and stainless steel can 5 of. 次に、ユニットセル中に所定の電解液(実施例1,2、比較例1においてはテトラブチルホスホニウムテトラフルオロボレートをプロピレンカーボネートに1.0M/lの濃度で溶解したもの、実施例3,4、比較例2においては30%硫酸水溶液)を注入して分極性電極1、2およびセパレータ3中にこの電解液を充分に含浸後、ポリプロピレン製パッキング6を介してキャップ4および缶5の端部をかしめて封口した。 Next, obtained by dissolving a predetermined electrolyte in the unit cell (Examples 1 and 2, in propylene carbonate tetrabutylphosphonium tetrafluoroborate in Comparative Example 1 at a concentration of 1.0 M / l, Examples 3 and 4, after sufficiently impregnated with the electrolytic solution during the injection to the polarizable electrode 2 and the separator 3 of 30% aqueous sulfuric acid solution) in Comparative example 2, the end of the cap 4 and can 5 via the polypropylene packing 6 caulking and sealing Te.

前述のようにして作製した電気二重層コンデンサのユニットセルを使用し、20℃において実施例1,2と比較例1では2.8V、実施例3,4と比較例2では0.9Vで、それぞれ30分間の定電圧充電を行い、その後1mA定電流放電し、放電時の端子間電圧がOVに至るまでの時間を測定して初期容量(F)を算出した。 Using the unit cell of the electric double layer capacitor was produced as described above, in Comparative Example 1 and Examples 1 and 2 at 20 ° C. 2.8V, with 0.9V Comparative Example 2 and Examples 3 and 4, respectively 30 constant voltage charge was performed for minutes, then 1mA constant current discharge, the voltage between the terminals during discharge was calculated initial capacity (F) by measuring the time until OV. さらに、交流二端子法(周波数1kHz)で内部抵抗を測定した。 Further, to measure the internal resistance in AC two terminal method (Frequency 1 kHz). 次に、同セルを Then, the same cell
70℃において1000時間実施例1,2と比較例1では2.8V、 In Comparative Example 1 at 70 ° C. and 1000 hours in Example 1, 2 2.8V,
実施例3,4と比較例2では0.9V連続印加した後の容量を同様にして測定し、初期値と比較して容量劣化率(%) The capacity after the Comparative Example 2, 0.9V continuous application as in Examples 3 and 4 were measured in the same manner, the capacity degradation rate compared to the initial value (%)
を算出した。 It was calculated. 以上の結果を第1表に示した。 The results are shown in Table 1.

[発明の効果] 以上説明したように本発明によれば、高温条件下での容量劣化率が低く且つ内部抵抗の増大も少ない長期信頼性の高い電気二重層コンデンサが得られる。 According to the present invention as has been described [Effect of the Invention], high electric double layer capacitor having increased even less long-term reliability of the capacity deterioration rate is low and the internal resistance under high temperature conditions is obtained.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

第1図は本発明による電気二重層コンデンサの一実施態様を示す部分断面図である。 Figure 1 is a partial cross-sectional view showing one embodiment of an electric double layer capacitor according to the present invention. 1,2……分極性電極 3……セパレータ 4……キャップ 5……缶 6……パッキング 1,2 ...... polarized electrode 3 ...... separator 4 ...... cap 5 ...... can 6 ...... Packing

───────────────────────────────────────────────────── フロントページの続き (72)発明者 真田 恭宏 神奈川県横浜市保土ケ谷区川島町1404― 1―11 (72)発明者 有賀 広志 神奈川県横浜市神奈川区片倉1―17―14 (56)参考文献 特開 昭55−99714(JP,A) 特開 昭61−66373(JP,A) 特開 昭60−42809(JP,A) 特開 昭59−172230(JP,A) 特開 昭62−232112(JP,A) ────────────────────────────────────────────────── ─── of the front page continued (72) inventor Sanada KyoHiroshi Yokohama, Kanagawa Prefecture Hodogaya-ku, Kawajima 1404- 1-11 (72) inventor Hiroshi Ariga Kanagawa Prefecture, Kanagawa-ku, Yokohama-shi KATAKURA 1-17-14 (56) reference Document JP Akira 55-99714 (JP, A) JP Akira 61-66373 (JP, A) JP Akira 60-42809 (JP, A) JP Akira 59-172230 (JP, A) JP Akira 62- 232112 (JP, A)

Claims (3)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】分極性電極と電解液の界面で形成される電気二重層を利用する電気二重層コンデンサにおいて、不純物であるFeが100ppm以下、Crが5ppm以下、Niが5ppm以下、Naが150ppm以下、Kが100ppm以下、Clが100ppm以下で、灰分が0.5%以下のヤシガラ活性炭よりなる分極性電極を用いることを特徴とする電気二重層コンデンサ。 1. A electric double layer capacitor utilizing an electric double layer formed at the interface of polarizable electrodes and an electrolytic solution, which is an impurity Fe is 100ppm or less, Cr is 5ppm or less, Ni is 5ppm or less, Na is 150ppm hereinafter, K is 100ppm or less, Cl is at 100ppm or less, the electric double layer capacitor, which comprises using a polarizable electrode ash and 0.5% or less of coconut shell activated carbon.
  2. 【請求項2】ヤシガラ活性炭は、比表面積が1500〜1900 2. A coconut shell activated carbon has a specific surface area of ​​1500 to 1900
    m 2 /g、平均細孔径が13〜20Å、全細孔容積が0.6〜0.9ml m 2 / g, an average pore diameter of 13~20A, total pore volume 0.6~0.9ml
    /g、細孔径20Å以上の細孔の容積が全細孔容積に対して / G, a pore volume of more than pore size 20Å is with respect to the total pore volume
    30〜50%の範囲である請求項1記載の電気二重層コンデンサ。 Electric double layer capacitor according to claim 1, wherein in the range of 30-50%.
  3. 【請求項3】電解液が非水溶媒系電解液である請求項1 Wherein the electrolyte is a non-aqueous solvent electrolyte claim 1
    又は2記載の電気二重層コンデンサ。 Or electric double layer capacitor according.
JP6824788A 1988-03-24 1988-03-24 Electric double layer capacitor Expired - Fee Related JP3038676B2 (en)

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JP3038676B2 true JP3038676B2 (en) 2000-05-08

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WO2004011371A1 (en) * 2002-07-30 2004-02-05 Kuraray Chemical Co.,Ltd. Activated carbon, method for production thereof, polarized electrode and electrical double layer capacitor

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US7154738B2 (en) 2002-11-29 2006-12-26 Honda Motor Co., Ltd. Polarizing electrode for electric double layer capacitor and electric double layer capacitor therewith
US7227737B2 (en) 2004-04-02 2007-06-05 Maxwell Technologies, Inc. Electrode design
US7352558B2 (en) 2003-07-09 2008-04-01 Maxwell Technologies, Inc. Dry particle based capacitor and methods of making same
US7342770B2 (en) 2003-07-09 2008-03-11 Maxwell Technologies, Inc. Recyclable dry particle based adhesive electrode and methods of making same
US7295423B1 (en) 2003-07-09 2007-11-13 Maxwell Technologies, Inc. Dry particle based adhesive electrode and methods of making same
KR100880829B1 (en) * 2003-10-17 2009-01-30 신닛뽄세키유 가부시키가이샤 Electric double layer capacitor, activated carbon for electrode thereof and method for producing same
US7245478B2 (en) * 2004-08-16 2007-07-17 Maxwell Technologies, Inc. Enhanced breakdown voltage electrode
FR2886045B1 (en) * 2005-05-23 2007-07-13 Ceca Sa Sa The electrode for energy storage systems, process for its production and energy storage system comprising the
JP2007194614A (en) * 2005-12-21 2007-08-02 Showa Denko Kk Electric double layer capacitor
JP2007169117A (en) * 2005-12-22 2007-07-05 Nippon Oil Corp Activated carbon and electrical double layer capacitor using same
WO2008053919A1 (en) * 2006-11-02 2008-05-08 Kuraray Chemical Co., Ltd Activated carbon and process for production thereof, nonaqueous type polarizable electrodes and electric double-layer capacitors

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JPS6015138B2 (en) * 1979-01-25 1985-04-17 Matsushita Electric Ind Co Ltd
JPH0436445B2 (en) * 1983-03-18 1992-06-16 Matsushita Electric Ind Co Ltd
JPH0470770B2 (en) * 1983-08-18 1992-11-11 Matsushita Electric Ind Co Ltd
JPH0213925B2 (en) * 1984-09-07 1990-04-05 Matsushita Electric Ind Co Ltd
JPS62232112A (en) * 1986-04-01 1987-10-12 Asahi Glass Co Ltd Electric double-layer capacitor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004011371A1 (en) * 2002-07-30 2004-02-05 Kuraray Chemical Co.,Ltd. Activated carbon, method for production thereof, polarized electrode and electrical double layer capacitor
US7759289B2 (en) 2002-07-30 2010-07-20 Kuraray Chemical Co., Ltd. Activated carbon, method for production thereof, polarizing electrode and electrical double layer capacitor

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