JPH01170009A - Electric double layer capacitor - Google Patents
Electric double layer capacitorInfo
- Publication number
- JPH01170009A JPH01170009A JP62327404A JP32740487A JPH01170009A JP H01170009 A JPH01170009 A JP H01170009A JP 62327404 A JP62327404 A JP 62327404A JP 32740487 A JP32740487 A JP 32740487A JP H01170009 A JPH01170009 A JP H01170009A
- Authority
- JP
- Japan
- Prior art keywords
- electric double
- double layer
- stainless steel
- metal case
- metal
- 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
- 239000003990 capacitor Substances 0.000 title claims abstract description 23
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 12
- 239000010935 stainless steel Substances 0.000 claims abstract description 12
- 238000005097 cold rolling Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 17
- 239000008151 electrolyte solution Substances 0.000 claims description 8
- 239000012790 adhesive layer Substances 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 3
- GQWNECFJGBQMBO-UHFFFAOYSA-N Molindone hydrochloride Chemical compound Cl.O=C1C=2C(CC)=C(C)NC=2CCC1CN1CCOCC1 GQWNECFJGBQMBO-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 230000007774 longterm Effects 0.000 abstract description 5
- 230000006866 deterioration Effects 0.000 abstract description 4
- 238000005554 pickling Methods 0.000 abstract description 4
- 230000006870 function Effects 0.000 abstract description 3
- 238000011282 treatment Methods 0.000 abstract description 2
- 238000000137 annealing Methods 0.000 abstract 1
- 238000005488 sandblasting Methods 0.000 abstract 1
- 239000003792 electrolyte Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- -1 polytetrafluoroethylene Polymers 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004745 nonwoven fabric Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical group OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- LYGJENNIWJXYER-UHFFFAOYSA-N nitromethane Chemical compound C[N+]([O-])=O LYGJENNIWJXYER-UHFFFAOYSA-N 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 239000003495 polar organic solvent Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- PNGLEYLFMHGIQO-UHFFFAOYSA-M sodium;3-(n-ethyl-3-methoxyanilino)-2-hydroxypropane-1-sulfonate;dihydrate Chemical compound O.O.[Na+].[O-]S(=O)(=O)CC(O)CN(CC)C1=CC=CC(OC)=C1 PNGLEYLFMHGIQO-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 150000005621 tetraalkylammonium salts Chemical class 0.000 description 1
- 125000005497 tetraalkylphosphonium group Chemical group 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
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
［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。
［従来の技術］
電気二重層コンデンサは、活性炭などよりなる表面積の
大きい分極性電極と電解液との界面で形成される電気二
重層に電荷を蓄積することを原理とするものであり、そ
の他のコンデンサよりも遥かに大きな静電容量が得られ
る点で注目されている。
第１図には電気二重層コンデンサのコイン型ユニットセ
ルの一般的な構造か示されている。
第１図において、活性炭粉末もしくは活性炭繊維を主成
分とする分極性電極ｌが、導電性接着層５によって金属
蓋体３に固着されており、同様に導電性接着層５”によ
って金属ケース４に固着された分極性電極２が、多孔性
セパレータ６を介して、分極性電極ｌと対向して配置さ
れている。セパレータ６および分極性電極１．２に電解
液を含浸させパッキング７を介して金属蓋体３および金
属ケース４がかしめにより刃口されてユニットセル８が
得られる。金属蓋体３及び金属ケース４の極性は任意で
あるが、通常は、金属蓋体３が正極側、金属ケース４が
負極側として使用されることが多いので、以下、この態
様の場合について説明する。
金属蓋体３及び金属ケース４の材料としては、コスト面
、耐食性や外観上の点から、Ｓ［ＪＳ３０４，３１６，
４３０などのステンレス鋼を冷間圧延した後、光輝熱処
理したＢＡ材（ＪＩＳ Ｇ４３０５−１９８７、表２０
に記載）が従来使用されてきた。
このような電気二重層コンデンサの主な用途であるＲＡ
Ｍ−ＩＧメモリなどのバックアップ電源としては、 Ｓ
、Ｓ Ｖの使用電圧が要求されるのに対して、前記コイ
ン型ユニットセルの耐電圧は水溶液系の電解液を用いた
場合は約０．８ｖ、非水溶媒系の電解液を用いた場合は
約２．８ｖであるため、通常ユニットセルな直列に２〜
７個積層して使用する必要がある。
［発明の解決しようとする問題点］
しかしながら、前述の従来の電気二重層コンデンサにお
いては、電解液溶媒の分解電圧近くまで印加電圧を上げ
て使用される場合、電解液と接する金属ケース面で、溶
媒の分解反応が進行し、長時間使用すると１分解ガスの
発生によって分極性電極が金属ケースよりはく離し、内
部抵抗が増大し、容量の低下が著しく、コンデンサの機
能が損われてしまうという欠点かあった。この現象は特
に負極側に分極される金属ケース側で顕著であった。
本発明は上記従来の欠点を解消し、最高使用電圧付近で
長期間使用しても性能の低下の極めて少ない長期信頼性
に優れた電気二重層コンデンサを提供することを目的と
するものである。
［問題点を解決するための手段］
かくして、本発明は電解液を含浸せしめた一対の分極性
電極を、電解液を含浸せしめたセパレーターを介して配
置し、一方の分極性電極は導電性接着層を介して金属ケ
ースに固着され、他方の分極性電極は導電性接着層を介
して金属蓋体に固着され、金属ケースと金属蓋体はパッ
キングを介して一体化されてなる電気二重層コンデンサ
において、金属ケース及び金属蓋体のうち、少くとも負
極側として作用する一方が、冷間圧延後ＪＩＳ Ｇ４３
０５のＮｏ．２ＤまたはＮｏ、２Ｂの表面仕上を施した
ステンレス鋼であることを特徴とする電気二重層コンデ
ンサを要旨とするものである。
即ち、本発明において、負極側の金属ケース材料として
、ステンレス鋼をＪＩＳ ０４３０５−１９８７の表２
０に示されるＮｏ．２Ｄまたは、Ｎｏ、２Ｂの表面処理
を施したものを使用する場合に、理由は未だ解明されて
いないが、上述の問題点が解決され、長期にわたって容
量の低下の生じない電気二重層コンデンサが得られる。
ここで、２Ｄまたは２Ｂの表面仕上法として好ましいの
は、ステンレス鋼を冷間圧延後、焼鈍して酸洗ないしサ
ンドブラストする方法であるが、酸洗する方法が好まし
い。
正極側の金ＨＭ体については、電気化学的耐食性か要求
されるので、例えば５ＵＳ３１６Ｌ。
５ＵＳ４４７ＪＩなどの耐食性の高いステンレス鋼を用
いることが好ましいが、これらは必ずしも２Ｄまたは２
Ｂの表面仕上をしたものである必要はない、しかし、内
部抵抗を長期にわたり低く維持するためには、正極側の
金属蓋体も２Ｄまたは２Ｂの表面仕上がされている方が
好ましい。
本発明で用いる分極性電極の材質については、特に限定
されないが、電解液に対して電気化学的に不活性で、か
つ比表面積の大きい活性炭粉末あるいは活性炭繊維を使
用するのか好ましい。
特に、活性炭粉末にポリテトラフルオロエチレン（ＰＴ
ＦＥ）などの結着剤を添加し、ロール成型してシート化
し、さらに必要に応じて延伸処理などを施した電極は、
単位体積当りの容量、強度および長期信頼性に優れてい
るのて好適に使用される。
本発明で用いるセパレータとしては電気二重層コンデン
サ用の通常のセパレータ、たとえばポリプロピレン繊維
不織布またはガラス繊維混抄不織布よりなるセパレータ
を使用することがてきる。
本発明で用いる電解液としては、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通常用いられる
もの、すなわち電気化学的に安定な溶質（電解質）を極
性有機溶媒に溶解したものが適宜使用される。電解液の
溶媒としては、プロピレンカーボネート、ブチレンカー
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、ｌ、２−ジメトキシエタン、スルホ
ラン、ニトロメタンなどが好適に使用される。
電解液の溶質としては、たとえば過塩素酸。
６フツ化リン酸、４フツ化ホウ酸、パーフルオロアルキ
ルスルホン酸などのアルカリ金属塩、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などがあ
げられ、これらの溶質を前記の溶媒に０．１〜３．０Ｍ
／！Ｌ好ましくは０．５〜１．５Ｍ／４１１の濃度で溶
解させた電解液が好適に使用される。
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高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。
［作用］
本発明において、金属ケース材料として酸洗焼鈍処理し
た２Ｂもしくは２Ｄ材ステンレス鋼を用いることにより
、その作用機構は必ずしも明確ではないが、溶媒の電気
化学的分解反応に対するケース表面の活性度が低下する
ことによって、分解ガスの発生や分極性電極のはがれが
著しく抑制されるという効果を生ずるものと考えられる
。
［実施例］
以下、実施例に基づき、本発明の詳細な説明する。
実施例１〜８比較例１〜２
本発明の実施例および比較例に共通のものとして第１図
に示すようなコイン型の電気二重層コンデンサのユニッ
トセル（直径２０ｍｍ、厚み２．０會會）を次のように
して作製した。まず、活性炭粉末（比表面積的２，０Ｏ
Ｏｓ”／ｇ ）に１０重量％のポリテトラフルオロエチ
レンを添加して湿式混線によってシート化した。このよ
うにして得られたシートを円板状に打ち抜いて分極性電
極ｌ（直径１５ｔｓ、厚さ０．７ｍｍ ）とし、分極性
電極ｌとこれと同一の組成、形状を有する分極性電極２
とをポリプロピレン繊維不織布よりなるセパレータ６を
介してステンレス鋼製の金属ケース３およびステンレス
鋼製の金属ケース４からなる外装容器中に、黒鉛系の導
電性接着層５゜５°によってそれぞれ接着され、収納さ
れる。
ユニットセル中には電解液として０．５モル／交の濃度
のテトラエチルホスホニウム・テトラフルオロボーレー
ト（（ＣＪｓ）４ＰＢＦ４ ）の炭酸プロピレン溶液を
注入して分極性電極１．２およびセパレータ６中にこの
電解液を充分に含浸させた後、ポリプロピレン製パッキ
ング７を介して金属ケース３および４の端部をかしめて
封口した。
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、第１表に示すような種々の表面処理
を施した金属ケース材料を用いた各セルについて、 ２
．８ Ｖの電圧を印加したときの初期容量（Ｆｏ）およ
び内部抵抗を測定した後、引続いてこのセルに２．８ｖ
の電圧を印加しながら７０°Ｃで１０００時間貯蔵した
後の容量（Ｆ）および内部抵抗を測定し、これらの測定
値から容量劣化率（（Ｆｏ−Ｆ）／Ｆ０）を計算し第１
表に示した。内部抵抗の測定は、交流二端子法（周波数
１ｋＨｚ）による、また、貯蔵後の測定後、セルを解体
し、プラス側およびマイナス側の分極性電極のはがれの
有無を観察した結果も合せて、表１に示す。[Industrial Application Field] The present invention relates to an electric double layer capacitor. [Prior Art] Electric double layer capacitors are based on the principle of accumulating charges in the electric double layer formed at the interface between a polarizable electrode with a large surface area, such as activated carbon, and an electrolyte. It is attracting attention because it has a much larger capacitance than a capacitor. FIG. 1 shows the general structure of a coin-shaped unit cell of an electric double layer capacitor. In FIG. 1, a polarizable electrode l whose main component is activated carbon powder or activated carbon fiber is fixed to a metal lid 3 by a conductive adhesive layer 5, and similarly to a metal case 4 by a conductive adhesive layer 5''. A fixed polarizable electrode 2 is placed facing the polarizable electrode 1 with a porous separator 6 in between.The separator 6 and the polarizable electrode 1.2 are impregnated with an electrolytic solution, The metal lid 3 and the metal case 4 are caulked to obtain the unit cell 8. The polarity of the metal lid 3 and the metal case 4 is arbitrary, but usually the metal lid 3 is on the positive electrode side and the metal case 4 is on the positive electrode side. Since the case 4 is often used as the negative electrode side, this embodiment will be described below.The material for the metal cover 3 and the metal case 4 is S[ from the viewpoint of cost, corrosion resistance, and appearance. JS304,316,
BA material (JIS G4305-1987, Table 20) which is bright heat treated after cold rolling stainless steel such as 430
) have been traditionally used. RA is the main application of such electric double layer capacitors.
As a backup power source for M-IG memory etc., S
, SV is required, whereas the withstand voltage of the coin-type unit cell is approximately 0.8 V when using an aqueous electrolyte, and approximately 0.8 V when using a non-aqueous electrolyte. is about 2.8V, so usually 2~2V are connected in series as a unit cell.
It is necessary to use 7 pieces stacked together. [Problems to be Solved by the Invention] However, in the above-mentioned conventional electric double layer capacitor, when the applied voltage is increased to near the decomposition voltage of the electrolyte solvent, the surface of the metal case in contact with the electrolyte, The decomposition reaction of the solvent progresses, and if used for a long time, the polarizable electrode will separate from the metal case due to the generation of decomposition gas, increasing internal resistance, significantly reducing capacitance, and impairing the function of the capacitor. There was. This phenomenon was particularly noticeable on the metal case side, which is polarized to the negative side. SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide an electric double layer capacitor which exhibits excellent long-term reliability and exhibits very little deterioration in performance even when used for a long period of time near the maximum working voltage. [Means for Solving the Problems] Thus, the present invention provides a method in which a pair of polarizable electrodes impregnated with an electrolytic solution are arranged via a separator impregnated with an electrolytic solution, and one polarizable electrode is attached to a conductive adhesive. The other polarizable electrode is fixed to the metal case via a conductive adhesive layer, and the metal case and metal cover are integrated via packing. At least one of the metal case and the metal lid, which acts as the negative electrode side, is JIS G43 after cold rolling.
05 No. The gist is an electric double layer capacitor characterized by being made of stainless steel with a 2D or No. 2B surface finish. That is, in the present invention, stainless steel is used as the metal case material on the negative electrode side according to Table 2 of JIS 04305-1987.
No. 0 shown in When using 2D, No., or 2B surface-treated capacitors, the above-mentioned problems are solved and an electric double layer capacitor that does not suffer from a decrease in capacitance over a long period of time can be obtained, although the reason is not yet clear. It will be done. Here, the preferable surface finishing method for 2D or 2B is to cold-roll the stainless steel, then anneal it, and pickle or sandblast it, but the pickling method is preferable. For the gold HM body on the positive electrode side, electrochemical corrosion resistance is required, so for example, 5US316L is used. It is preferable to use stainless steel with high corrosion resistance such as 5US447JI, but these are not necessarily 2D or 2D.
It is not necessary that the metal cover on the positive electrode side has a 2D or 2B surface finish, however, in order to maintain a low internal resistance over a long period of time. The material of the polarizable electrode used in the present invention is not particularly limited, but it is preferable to use activated carbon powder or activated carbon fiber that is electrochemically inert to the electrolyte and has a large specific surface area. In particular, activated carbon powder contains polytetrafluoroethylene (PT).
The electrode is made by adding a binder such as FE), roll-forming it into a sheet, and subjecting it to stretching treatment as necessary.
It is preferably used because it has excellent capacity per unit volume, strength, and long-term reliability. As the separator used in the present invention, a usual separator for electric double layer capacitors, such as a separator made of polypropylene fiber nonwoven fabric or glass fiber mixed nonwoven fabric, can be used. The electrolytic solution used in the present invention is not particularly limited, and those normally used for electric double layer capacitors, that is, those in which an electrochemically stable solute (electrolyte) is dissolved in a polar organic solvent, can be used as appropriate. be done. As the solvent for the electrolytic solution, propylene carbonate, butylene carbonate, γ-butyrolactone, acetonitrile, dimethylformamide, 1,2-dimethoxyethane, sulfolane, nitromethane, etc. are preferably used. An example of a solute in the electrolyte is perchloric acid. Examples include alkali metal salts such as hexafluorophosphoric acid, tetrafluoroboric acid, and perfluoroalkylsulfonic acid, tetraalkylammonium salts, and tetraalkylphosphonium salts. .0M
/! An electrolytic solution in which L is preferably dissolved at a concentration of 0.5 to 1.5 M/411 is preferably used. The conductive adhesive used in the present invention is preferably a high-purity, high-lead adhesive that contains almost no binder.
A graphite or carbon black-based conductive adhesive containing a resin binder such as phenol or an inorganic binder such as water glass may also be used. [Function] In the present invention, by using pickled and annealed 2B or 2D stainless steel as the metal case material, the activity of the case surface against the electrochemical decomposition reaction of the solvent is improved, although the mechanism of action is not necessarily clear. It is thought that the reduction in the amount of carbon dioxide has the effect of significantly suppressing the generation of decomposed gas and the peeling of the polarizable electrode. [Examples] Hereinafter, the present invention will be described in detail based on Examples. Examples 1 to 8 Comparative Examples 1 to 2 Common to the Examples and Comparative Examples of the present invention, a unit cell of a coin-shaped electric double layer capacitor (diameter 20 mm, thickness 2.0 mm) as shown in FIG. ) was produced as follows. First, activated carbon powder (specific surface area 2,0O
Os''/g) was added with 10% by weight of polytetrafluoroethylene and formed into a sheet by wet cross-wiring.The sheet thus obtained was punched out into a disk shape to form a polarizable electrode (diameter: 15ts, thickness: 0.7 mm), and has the same composition and shape as polarizable electrode 1 and polarizable electrode 2.
and are bonded via a separator 6 made of polypropylene fiber nonwoven fabric into an outer container made of a stainless steel metal case 3 and a stainless steel metal case 4 by a graphite-based conductive adhesive layer 5° 5°, respectively, It will be stored. A propylene carbonate solution of tetraethylphosphonium tetrafluoroborate ((CJs)4PBF4) with a concentration of 0.5 mol/aq is injected into the unit cell as an electrolyte, and this electrolyte is introduced into the polarizable electrode 1.2 and separator 6. After sufficiently impregnating with the liquid, the ends of the metal cases 3 and 4 were caulked and sealed via the polypropylene packing 7. For each cell using the unit cell of the electric double layer capacitor produced as described above and using the metal case material subjected to various surface treatments as shown in Table 1, 2
．． After measuring the initial capacitance (Fo) and internal resistance when applying a voltage of 8 V, the cell was subsequently
The capacitance (F) and internal resistance were measured after storage at 70°C for 1000 hours while applying a voltage of
Shown in the table. The internal resistance was measured using the AC two-terminal method (frequency 1 kHz), and after the measurement after storage, the cell was disassembled and the polarizable electrodes on the positive and negative sides were observed for peeling. It is shown in Table 1.
本発明は、第１表の如く、長期間最高使用電圧付近の電
圧を印加しても、内部抵抗の上昇や容量劣化が少なく、
長期信頼性に優れた電気二重層コンデンサを提供しうる
ちのである。As shown in Table 1, the present invention minimizes internal resistance increase and capacity deterioration even when a voltage near the maximum working voltage is applied for a long period of time.
Uruchino provides electric double layer capacitors with excellent long-term reliability.
第１図は本発明の電気二重層コンデンサの部分断面図で
ある。FIG. 1 is a partial sectional view of the electric double layer capacitor of the present invention.
Claims (1)
を含浸せしめたセパレーターを介して配置し、一方の分
極性電極は導電性接着層を介して金属ケースに固着され
、他方の分極性電極は導電性接着層を介して金属蓋体に
固着され、金属ケースと金属蓋体はパッキングを介して
一体化されてなる電気二重層コンデンサにおいて、金属
ケース及び金属蓋体のうち、少くとも負極側として作用
する一方 が、冷間圧延後ＪＩＳ Ｇ４３０５のＮｏ．２Ｄまたは
Ｎｏ．２Ｂの表面仕上を施したステンレス鋼であること
を特徴とする電気二重層コンデン サ。1. A pair of polarizable electrodes impregnated with an electrolytic solution are placed through a separator impregnated with an electrolytic solution, one polarizable electrode is fixed to a metal case via a conductive adhesive layer, and the other polarizable electrode is fixed to a metal case via a conductive adhesive layer. is fixed to the metal lid via a conductive adhesive layer, and the metal case and metal lid are integrated through packing.In an electric double layer capacitor, at least the negative electrode side of the metal case and the metal lid One side that acts as JIS G4305 No. after cold rolling. 2D or No. An electric double layer capacitor characterized by being made of stainless steel with a 2B surface finish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62327404A JP2718684B2 (en) | 1987-12-25 | 1987-12-25 | Electric double layer capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62327404A JP2718684B2 (en) | 1987-12-25 | 1987-12-25 | Electric double layer capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01170009A true JPH01170009A (en) | 1989-07-05 |
| JP2718684B2 JP2718684B2 (en) | 1998-02-25 |
Family
ID=18198776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62327404A Expired - Fee Related JP2718684B2 (en) | 1987-12-25 | 1987-12-25 | Electric double layer capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2718684B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56109458A (en) * | 1980-02-01 | 1981-08-29 | Matsushita Electric Ind Co Ltd | Manufacture of flat battery |
| JPS57143268A (en) * | 1981-02-27 | 1982-09-04 | Toshiba Battery Co Ltd | Manufacture of organic solvent battery |
| JPS57202653A (en) * | 1981-06-09 | 1982-12-11 | Toshiba Battery Co Ltd | Battery with organic solvent |
| JPS60176216A (en) * | 1984-02-22 | 1985-09-10 | 松下電器産業株式会社 | Electric double layer capacitor |
-
1987
- 1987-12-25 JP JP62327404A patent/JP2718684B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56109458A (en) * | 1980-02-01 | 1981-08-29 | Matsushita Electric Ind Co Ltd | Manufacture of flat battery |
| JPS57143268A (en) * | 1981-02-27 | 1982-09-04 | Toshiba Battery Co Ltd | Manufacture of organic solvent battery |
| JPS57202653A (en) * | 1981-06-09 | 1982-12-11 | Toshiba Battery Co Ltd | Battery with organic solvent |
| JPS60176216A (en) * | 1984-02-22 | 1985-09-10 | 松下電器産業株式会社 | Electric double layer capacitor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2718684B2 (en) | 1998-02-25 |
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