JPH02177525A - Electric double layer capacitor - Google Patents
Electric double layer capacitorInfo
- Publication number
- JPH02177525A JPH02177525A JP63334405A JP33440588A JPH02177525A JP H02177525 A JPH02177525 A JP H02177525A JP 63334405 A JP63334405 A JP 63334405A JP 33440588 A JP33440588 A JP 33440588A JP H02177525 A JPH02177525 A JP H02177525A
- Authority
- JP
- Japan
- Prior art keywords
- electric double
- double layer
- fiber cloth
- layer capacitor
- carbon fiber
- 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.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- 239000004744 fabric Substances 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 4
- 239000003792 electrolyte Substances 0.000 claims abstract 2
- 238000001947 vapour-phase growth Methods 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 5
- 238000000151 deposition Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000005022 packaging material Substances 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 239000004917 carbon fiber Substances 0.000 abstract 3
- 230000015556 catabolic process Effects 0.000 abstract 2
- -1 etc. Substances 0.000 abstract 1
- 238000010285 flame spraying Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000005486 organic electrolyte Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- BNPJNOLDKSAJSD-UHFFFAOYSA-N C(C)[N+](CC)(CC)CC.[B+3] Chemical compound C(C)[N+](CC)(CC)CC.[B+3] BNPJNOLDKSAJSD-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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
Abstract
Description
【発明の詳細な説明】
竜業上の利用分野
本発明は各種電子機器に用いられるマイクロコンピュー
タなどのメモリーバックアップに用いられる電気二重層
コンデンサに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Application The present invention relates to an electric double layer capacitor used for memory backup in microcomputers and the like used in various electronic devices.
従来の技術
電気二重層コンデンサの基本構成を第８図に示す。分極
性電極１には活性炭が用いられ、活性炭粉末の場合には
結着剤、導電剤などと共に混練したものを成型体にした
ものが活性炭繊維の場合には、織布状にした活性炭繊維
布が用いられてきた。The basic structure of a conventional electric double layer capacitor is shown in FIG. Activated carbon is used for the polarizable electrode 1. In the case of activated carbon powder, activated carbon fiber is a molded product obtained by kneading with a binder, a conductive agent, etc., and in the case of activated carbon fiber, a woven activated carbon fiber cloth is used. has been used.
分極性電極１は集電体層２を通してケース材と電気的接
続されており集電体層２にはアルミニウムのプラズマ溶
射膜、導電性カーボン塗料などが用いられている。電解
液を含浸された一対の分極性電極１がセパレータ３を介
して積層され、ケース材に収納され、パツキン材の絞め
てより封口された構造となっている。The polarizable electrode 1 is electrically connected to a case material through a current collector layer 2, and the current collector layer 2 is made of a plasma sprayed aluminum film, a conductive carbon paint, or the like. A pair of polarizable electrodes 1 impregnated with an electrolytic solution are laminated with a separator 3 in between, housed in a case material, and sealed with a packing material.
発明が解決しようとする課題
分極性電極１として活性炭粉末を用いたものでは、電極
体の成型のためには活性炭粉本のみでは困難であり、結
着剤としてＧＭＧ（カルボキシルメチルセルロース）、
フッ素樹脂などを混合しなければならず、有機系電解液
を用いた電気二重層コンデンサの場合、有機電解液と活
性炭のみの分極性電極、例えば活性炭繊維市電価を用い
た場合と比べ、結着剤の入った分極性電極を用いた場合
。Problems to be Solved by the Invention When using activated carbon powder as the polarizable electrode 1, it is difficult to mold the electrode body using activated carbon powder alone, and GMG (carboxyl methyl cellulose),
In the case of an electric double layer capacitor using an organic electrolyte, it is necessary to mix a fluororesin, etc., compared to a polarizable electrode made of only an organic electrolyte and activated carbon, such as an activated carbon fiber streetcar electrode. When using a polarizable electrode containing an agent.
耐電圧が低くなるという欠点があった。これは結着剤の
成分が何らかの電気化学的反応を起すため本来の有機系
電解液の耐電圧が得られないものと考えられる。一方分
極性電極１に活性炭繊維布を用いた場合、結着剤のよう
な不純物を含まないため耐電圧の面では優れているが、
布状で変形しやすいことがあり、活性炭繊維間の接触は
ケース材の絞めによる活性炭繊維布の圧接により保たれ
ている。電気二重層コンデンサの高温負荷試験をした場
合、従来７０Ｃ、２，ａｖ印加を製品の寿命保証時間以
上の長時間印加し続けた場合、極めて微小な漏れ電流の
蓄積による内部ガスの上昇によりケース材がわずかふく
らむ傾向がある。活性炭繊維布のみではこのケース材の
わずかな変形により活性炭繊維間の接触の圧力が変化し
、集電性能の低下による製品容量変化を生じる欠点があ
った。The drawback was that the withstand voltage was low. This is considered to be because the components of the binder cause some kind of electrochemical reaction, making it impossible to obtain the original withstand voltage of the organic electrolyte. On the other hand, when activated carbon fiber cloth is used for the polarizable electrode 1, it is superior in terms of withstand voltage because it does not contain impurities such as binders.
It is cloth-like and may be easily deformed, and contact between the activated carbon fibers is maintained by pressing the activated carbon fiber cloth by tightening the case material. When performing high-temperature load tests on electric double layer capacitors, if the conventional 70C, 2, AV voltage was applied for a long time beyond the guaranteed life of the product, the case material would deteriorate due to the rise in internal gas due to the accumulation of extremely small leakage current. tends to swell slightly. If only the activated carbon fiber cloth was used, a slight deformation of the case material would change the contact pressure between the activated carbon fibers, resulting in a change in product capacity due to a decrease in current collection performance.
本発明は活性炭繊維布を分極性電極として用いた電気二
重層コンデンサの集電性能の向上を図り結着剤のような
炭素材料以外の不純物を含まない電極体とすることによ
り耐電圧が高くより長寿命の電気二重層コンデンサを提
供しようとするものである。The present invention aims to improve the current collection performance of an electric double layer capacitor using activated carbon fiber cloth as a polarizable electrode, and by making the electrode body free of impurities other than carbon materials such as binders, the withstand voltage is higher and the voltage is higher. The aim is to provide a long-life electric double layer capacitor.
課題を解決するための手段
本発明は上記の課題を解決するために、分極性電極とし
て活性炭繊維布に気相成長法で炭素を析出させ、炭素材
料のみで繊維間の電気的接触を保つ構成としたものであ
る。Means for Solving the Problems In order to solve the above problems, the present invention has a structure in which carbon is deposited on activated carbon fiber cloth as a polarizable electrode by a vapor phase growth method, and electrical contact between the fibers is maintained only by the carbon material. That is.
作用
上記構成とすることにより、集電性の向上が図れ、耐電
圧の高い電気二重層コンデンサとすることができる。Effect: By having the above-mentioned structure, it is possible to improve the current collection property and provide an electric double layer capacitor with high withstand voltage.
実施例
以下、本発明の一実施例を添付の図面を用いて説明する
。Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.
まず、第１図において、４は活性炭繊維布に気相成長法
で炭素の微粒子を析出させた分極性電極、６はこの分極
性電ＦＭ４の片面に形成されたアルミニウムなどからな
る集電体、６は上記分極性電極４間に介在されたセパレ
ータ、７，８は上記電解液を含浸した分極性電極４．セ
パレータ６を積層し封入する金属ケース、９は上記金属
ケース７゜８の封口部に配置されるパツキン材である。First, in FIG. 1, numeral 4 is a polarizable electrode in which fine carbon particles are deposited on activated carbon fiber cloth by a vapor growth method, 6 is a current collector made of aluminum or the like formed on one side of this polarizable electrode FM4, 6 is a separator interposed between the polarizable electrodes 4, and 7 and 8 are polarizable electrodes 4 impregnated with the electrolytic solution. A metal case 9 in which the separator 6 is laminated and enclosed is a packing material placed in the sealing part of the metal case 7.8.
このような構成で、分極性電極４は次のように製造され
る。With such a configuration, the polarizable electrode 4 is manufactured as follows.
第２図に示すように活性炭繊維布４＆に気相成長法で炭
素の微粒子４ｂを析出させることにより、市のようなミ
クロに見て凹凸のあるものの表面にも均一に繊維間のす
き間まで炭素微粒子４ｂを析出させることができる。こ
のように活性炭繊維上への炭素微粒子の析出層の成長に
より、繊維間は炭素微粒子のつながりにより電気的接触
の向上が図れる。まず本発明に使用した分極性電極の具
体的な作り方を述べる。第３図に示すような密閉型の炉
芯管１０内に活性炭繊維布４ａを平らに広げて入れる。As shown in Fig. 2, by depositing fine carbon particles 4b on activated carbon fiber cloth 4& by vapor growth method, carbon particles can be deposited uniformly on the surface of even the microscopically uneven surface like a city and even in the gaps between the fibers. Fine particles 4b can be precipitated. In this way, the growth of the precipitated layer of carbon fine particles on the activated carbon fibers improves the electrical contact between the fibers due to the connection of the carbon fine particles. First, a specific method of making the polarizable electrode used in the present invention will be described. Activated carbon fiber cloth 4a is spread flat and put into a closed furnace core tube 10 as shown in FIG.
予めフィルター１１を前置した真空ポンプ１２で炉芯管
１ｏ内を５ｍｍＨｇ以下の真空にし、温度を徐々に上げ
１０００〜１１００℃に達したところで二方コック１３
をゆっくり開は炭素微粒子の供給源である炭化水素１４
（例えばベンゼン、ミクロヘキサン）を炉心管１０内に
導入する。この間も真空ポンプ１２で５ｍｍＨｇ以下、
好ましくは３ｍｍＨｇ以下に引いておく。二方コック１
３の開は具合でも異るが数時間で数μｍ程度の炭素膜が
活性炭繊維の周囲に形成される。１６はマノメータであ
る。A vacuum pump 12 with a filter 11 installed in advance is used to create a vacuum of 5 mmHg or less in the furnace core tube 1o, and the temperature is gradually raised to 1000-1100°C, when the two-way cock 13 is turned on.
Slowly opening the hydrocarbon 14 which is the source of carbon particles
(eg benzene, microhexane) is introduced into the furnace tube 10. During this time, the vacuum pump 12 was used to reduce the pressure to 5 mmHg or less.
Preferably, the pressure is kept below 3 mmHg. Two-way cock 1
The opening of No. 3 varies depending on the situation, but a carbon film of several micrometers is formed around the activated carbon fibers in several hours. 16 is a manometer.
次に具体的な実施例について説明する。Next, specific examples will be described.
（実施例１）
上記で得られた分極性電極４０片面にアルミニウムをプ
ラズマ溶射して集電体６を形成した後。(Example 1) After plasma spraying aluminum onto one side of the polarizable electrode 40 obtained above to form a current collector 6.
φ１３に打抜き、電解液を含浸させセパレータ６を介し
、対向させ第１図に示すようにステンレスなどの金属ケ
ース７．８とパツキン材９によりコイン型の電気二重層
コンデンサを作製する。電解液としてはプロピレンカー
ボネートにテトラエチルアンモニウム４フツ化ホウ素を
溶解したものを用いた。比較用に従来の活性炭繊維布を
分極性電極に用いたものを試作し、寿命試験に供した。A coin-shaped electric double layer capacitor is manufactured by punching out a diameter 13 mm, impregnating it with an electrolytic solution, facing each other with a separator 6 in between, and using a metal case 7.8 made of stainless steel or the like and a packing material 9, as shown in FIG. The electrolytic solution used was one in which tetraethylammonium boron tetrafluoride was dissolved in propylene carbonate. For comparison, a prototype using a conventional activated carbon fiber cloth as a polarizable electrode was manufactured and subjected to a life test.
寿命試験は上記コイン型の製品を７０℃恒温槽中で２．
８ｖ電圧印加した後の容量変化率（ΔＧ）、インピーダ
ンス（Ｚ’ｌの変化で評価しそれぞれ第４図、第５図に
示す。図中実線が本発明、破線が従来例の特性を示して
おり、本発明の方が寿命性で著しく優れていることが明
らかである。The life test was carried out by placing the above coin-shaped product in a constant temperature bath at 70°C.
The capacitance change rate (ΔG) and impedance (Z'l) after applying a voltage of 8 V were evaluated and shown in FIGS. 4 and 5, respectively. In the figure, the solid line shows the characteristics of the present invention, and the broken line shows the characteristics of the conventional example. It is clear that the present invention is significantly superior in terms of service life.
（実施例２）
上記と同様の分極性電極４０片面に導電性カーボン塗料
を塗布して集電体６とし、金属ケース７゜８と接着させ
、実施例１と同様の方法でコイン型の電気二重層コンデ
ンサに組立てた。従来の活性炭繊維布電極を用いたもの
を同様に比較用とした。(Example 2) A conductive carbon paint is applied to one side of the polarizable electrode 40 similar to the above to form a current collector 6, which is adhered to a metal case 7. Assembled into a double layer capacitor. A similar example using a conventional activated carbon fiber cloth electrode was used for comparison.
７０℃、２８ｖ電圧印加の寿命試倹の結果を第６図、第
７図に示した。図中、実線が本発明、破線が従来例の特
性を示しており、本発明の方がより長寿命であることが
明らかである。The results of the life test at 70° C. and application of 28 V voltage are shown in FIGS. 6 and 7. In the figure, the solid line shows the characteristics of the present invention, and the broken line shows the characteristics of the conventional example, and it is clear that the present invention has a longer life.
発明の効果
以上のように本発明の分極性電極を用いた電気二重層コ
ンデンサは、従来のものに比べ集電性の向上により、容
量変化率で約２倍の長寿命が可能となり、工業的価値の
大なるものである。Effects of the Invention As described above, the electric double layer capacitor using the polarizable electrode of the present invention has improved current collecting ability compared to conventional capacitors, and can have a lifespan approximately twice as long in terms of capacitance change rate, making it suitable for industrial use. It is of great value.
第１図は電気二重層コンデンサの一実施例を示す断面図
、第２図は本発明の分極性電極に用い穴活性炭繊維布の
拡大図、第３図は炭素の気相成長に用いた電気炉の溝底
を示す概略構成図、第４図は本発明及び従来の分極性電
極を用い、アルミ溶射の集電体を用いた場合の寿命特性
の容量変化特性図、第６図は同インピーダンス特性図、
第６図は本発明及び従来の分極性電極に対し導電性カー
ボン塗料を集電体とした場合の容量変化特性図、第７図
は同インピーダンス特性図、第８図は電気二重層コンデ
ンサの基本構成図である。
４・・・・・・分極性電極、６・・・・・・集電体、６
・・・・・・セパレータ、７．８・・・・・・金属ケー
ス、９・・・・・・パツキン材。
代理人の氏名 弁理士 粟 野 重 孝 ほか１名イン
Ｃ−グンヌ（Ω）
奨
調Fig. 1 is a cross-sectional view showing one embodiment of an electric double layer capacitor, Fig. 2 is an enlarged view of a porous activated carbon fiber cloth used in the polarizable electrode of the present invention, and Fig. 3 is a cross-sectional view showing an example of an electric double layer capacitor. A schematic configuration diagram showing the groove bottom of the furnace. Figure 4 is a capacitance change characteristic diagram of life characteristics when using the present invention and the conventional polarizable electrode and an aluminum sprayed current collector. Figure 6 is a diagram of the same impedance. Characteristic diagram,
Figure 6 is a capacitance change characteristic diagram of the present invention and conventional polarizable electrodes when conductive carbon paint is used as a current collector, Figure 7 is an impedance characteristic diagram of the same, and Figure 8 is the basics of electric double layer capacitors. FIG. 4... Polarizable electrode, 6... Current collector, 6
... Separator, 7.8 ... Metal case, 9 ... Packaging material. Name of agent: Patent attorney Shigetaka Awano and one other person InC Gunnu (Ω) Shoncho
Claims (1)
のみで繊維間の電気的接触を保つ分極性電極をセパレー
タを介して積層し、これらに電解液を含浸させてケース
内に封入してなる電気二重層コンデンサ。Carbon is deposited on activated carbon fiber cloth using a vapor phase growth method, and polarizable electrodes are layered with a separator in between to maintain electrical contact between the fibers using only the carbon material.These are impregnated with electrolyte and sealed in a case. Electric double layer capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63334405A JPH02177525A (en) | 1988-12-28 | 1988-12-28 | Electric double layer capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63334405A JPH02177525A (en) | 1988-12-28 | 1988-12-28 | Electric double layer capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02177525A true JPH02177525A (en) | 1990-07-10 |
Family
ID=18277001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63334405A Pending JPH02177525A (en) | 1988-12-28 | 1988-12-28 | Electric double layer capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02177525A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5621607A (en) * | 1994-10-07 | 1997-04-15 | Maxwell Laboratories, Inc. | High performance double layer capacitors including aluminum carbon composite electrodes |
| US5862035A (en) * | 1994-10-07 | 1999-01-19 | Maxwell Energy Products, Inc. | Multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes |
| US6233135B1 (en) | 1994-10-07 | 2001-05-15 | Maxwell Energy Products, Inc. | Multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes |
| US6449139B1 (en) | 1999-08-18 | 2002-09-10 | Maxwell Electronic Components Group, Inc. | Multi-electrode double layer capacitor having hermetic electrolyte seal |
| US6631074B2 (en) | 2000-05-12 | 2003-10-07 | Maxwell Technologies, Inc. | Electrochemical double layer capacitor having carbon powder electrodes |
| US6813139B2 (en) | 2001-11-02 | 2004-11-02 | Maxwell Technologies, Inc. | Electrochemical double layer capacitor having carbon powder electrodes |
| JP2006332627A (en) * | 2005-04-25 | 2006-12-07 | Power System:Kk | Positive electrode for electric double layer capacitor and manufacturing method thereof |
-
1988
- 1988-12-28 JP JP63334405A patent/JPH02177525A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6233135B1 (en) | 1994-10-07 | 2001-05-15 | Maxwell Energy Products, Inc. | Multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes |
| US6585152B2 (en) | 1994-10-07 | 2003-07-01 | Maxwell Technologies, Inc. | Method of making a multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes |
| US5862035A (en) * | 1994-10-07 | 1999-01-19 | Maxwell Energy Products, Inc. | Multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes |
| US5907472A (en) * | 1994-10-07 | 1999-05-25 | Maxwell Laboratories, Inc. | Multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes |
| US6059847A (en) * | 1994-10-07 | 2000-05-09 | Maxwell Energy Products, Inc. | Method of making a high performance ultracapacitor |
| US6094788A (en) * | 1994-10-07 | 2000-08-01 | Maxwell Energy Products, Inc. | Method of making a multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes |
| US5777428A (en) * | 1994-10-07 | 1998-07-07 | Maxwell Energy Products, Inc. | Aluminum-carbon composite electrode |
| US6430031B1 (en) | 1994-10-07 | 2002-08-06 | Maxwell Electronic Components Group, Inc. | Low resistance bonding in a multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes |
| US5621607A (en) * | 1994-10-07 | 1997-04-15 | Maxwell Laboratories, Inc. | High performance double layer capacitors including aluminum carbon composite electrodes |
| US6451073B1 (en) | 1994-10-07 | 2002-09-17 | Maxwell Electronic Components Group, Inc. | Method of making a multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes |
| US6449139B1 (en) | 1999-08-18 | 2002-09-10 | Maxwell Electronic Components Group, Inc. | Multi-electrode double layer capacitor having hermetic electrolyte seal |
| US6842330B2 (en) | 1999-08-18 | 2005-01-11 | Maxwell Technologies, Inc. | Multi-electrode double layer capacitor having hermetic electrolyte seal |
| US6631074B2 (en) | 2000-05-12 | 2003-10-07 | Maxwell Technologies, Inc. | Electrochemical double layer capacitor having carbon powder electrodes |
| US6813139B2 (en) | 2001-11-02 | 2004-11-02 | Maxwell Technologies, Inc. | Electrochemical double layer capacitor having carbon powder electrodes |
| JP2006332627A (en) * | 2005-04-25 | 2006-12-07 | Power System:Kk | Positive electrode for electric double layer capacitor and manufacturing method thereof |
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