JP5060471B2 - 湿式電解コンデンサ - Google Patents
湿式電解コンデンサ Download PDFInfo
- Publication number
- JP5060471B2 JP5060471B2 JP2008513607A JP2008513607A JP5060471B2 JP 5060471 B2 JP5060471 B2 JP 5060471B2 JP 2008513607 A JP2008513607 A JP 2008513607A JP 2008513607 A JP2008513607 A JP 2008513607A JP 5060471 B2 JP5060471 B2 JP 5060471B2
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- JP
- Japan
- Prior art keywords
- cathode
- electrolytic capacitor
- wet electrolytic
- coating
- nbo
- 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.)
- Expired - Fee Related
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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Description
アノード: 2Ta → 2Ta5+10e
2Ta5+10OH- → Ta2O5+5H2O
カソード: 10H2O+10e → 5H2+10OH-
しかしながら、上述の誘電体膜21は、本発明において用いることができる誘電体膜の一例に過ぎないことが理解されるべきである。特に、誘電体膜は、他の種類の材料から異なる技術を用いて形成することができる。例えば、必要に応じて、ポリイミド膜といった高分子誘電体膜を用いることができる。そのような被膜の例が、Kudoh他の米国特許第5,812,367号に説明されている。誘電体膜は又、高温で酸素(O2)又は水にさらすことにより熱的に形成することができる。
以下の実施例において、コンデンサは、本発明のいくつかの実施形態により形成された。静電容量及び散逸率は、Agilent社製16089Bケルビン・クリップ・リードを用いてAgilent社製4284A Precision LCRメータを使用して、120ヘルツで2ボルト・バイアス及び1ボルト信号で測定された。
表I
表III
表IV
表V
表VI
表VII
表VIII
表IX
表X
表XI
表XII
表XIII
本比較例においては、導電性ポリマーPEDTで被覆されたタンタル片又はタンタル箔のみを含むカソード(例えば、二酸化ニオブといった金属酸化物の被膜なしのカソード)を用いて形成されたコンデンサの静電容量を明らかにするために、実験が行われた。具体的には、本比較例においては、タンタルクーポンを用意し、0グラムないし約0.0012グラムの範囲の様々な量のPEDTでタンタルクーポンを被覆することのみによって、いくつかのカソードが形成された。PEDT被覆されたカソードの各々及び標準アノードを用いて、コンデンサが形成され、コンデンサの各々のセル静電容量がμFで測定され、記録された。
Claims (35)
- 湿式電解コンデンサであって、
アノードと、
金属基体、及び該金属基体を被覆する酸化物被膜を含むカソードと、
前記カソードとアノードとの間に配置された液体電解質と、
導電性ポリマーを含む被膜と、
を含み、
前記導電性ポリマー被膜は、前記酸化物被膜を被覆し、
前記酸化物被膜は、ニオブと酸素の原子比率が1:2.5未満のニオブ酸化物を含み、 前記金属基体は、タンタル、ニオブ、アルミニウム、ハフニウム、チタン、及びそれらの組合せからなる群から選択される金属を含む、ことを特徴とする湿式電解コンデンサ。 - 前記ニオブ酸化物は、ニオブと酸素の原子比率が1:1.5未満であること特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記ニオブ酸化物は、NbO0.7、NbO1.0、NbO1.1及びNbO2からなる群から選択されること特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記ニオブ酸化物は、ニオブと酸素の原子比率が1:0.5±0.2であること特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記ニオブ酸化物は、NbO2であること特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記導電性ポリマーは、ポリピロール、ポリチオフェン、ポリアニリン、ポリアセチレン、ポリ−p−フェニレン、及びそれらの組合せからなる群から選択されること特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記導電性ポリマーは、ポリ(3,4−エチレンジオキシチオフェン)であること特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記酸化物被膜と前記導電性ポリマーとの間に配置された保護被膜を更に含むこと特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記金属基体は、銅、銀、及びそれらの組合せからなる群から選択される金属を含むこと特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記液体電解質は、硫酸水溶液であること特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記アノードは、タンタル、アルミニウム、チタン、ニオブ、ジルコニウム、ハフニウム、及びそれらの組合せからなる群から選択される金属を含むこと特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記アノードは、前記金属の酸化物又は窒化物を含むこと特徴とする請求項11に記載の湿式電解コンデンサ。
- 前記ニオブ酸化物のB.E.T.表面積は、約0.5m2/グラムないし約40m2/グラムであること特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記ニオブ酸化物の粒径は、約0.1μmないし約5μmであること特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記コンデンサの散逸率は、約50%未満であること特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記コンデンサの体積効率は、約10,000μF*V/ccよりも大きいこと特徴とする請求項1に記載の湿式電解コンデンサ。
- 前記コンデンサの体積効率は、約20,000μF*V/ccよりも大きいこと特徴とする請求項1に記載の湿式電解コンデンサ。
- 湿式電解コンデンサを形成するための方法であって、
アノードの表面を陽極酸化して誘電体膜を形成するステップと、
カソードの金属基体に粒子懸濁液を塗布するステップと、
前記懸濁液を焼結して酸化物被膜を形成するステップと、
前記アノードと前記カソードとの間に液体電解質を配置するステップと、
を含み、
前記酸化物被膜は、ニオブと酸素の原子比率が1:2.5未満のニオブ酸化物を含むことを特徴とする方法。 - 前記懸濁液は、ニオブと酸素の原子比率が1:2.5未満のニオブ酸化物を含むことを特徴とする請求項18に記載の方法。
- 前記懸濁液は、NbO2を含むことを特徴とする請求項18に記載の方法。
- 前記懸濁液は、Nb2O5を含むことを特徴とする請求項18に記載の方法。
- 前記懸濁液の固体含量は、重量で約20%ないし約80%であることを特徴とする請求項18に記載の方法。
- 前記金属基体は、前記懸濁液に浸漬されることを特徴とする請求項18に記載の方法。
- 前記酸化物被膜は、前記懸濁液の複数の層から形成されることを特徴とする請求項18に記載の方法。
- 前記層の各々の厚さは、約150μm未満であることを特徴とする請求項24に記載の方法。
- 前記懸濁液は、約800℃ないし約1400℃の温度で焼結されることを特徴とする請求項18に記載の方法。
- 導電性ポリマー被膜、保護被膜、又はその両方を前記酸化物被膜上に施すステップを更に含むことを特徴とする請求項18に記載の方法。
- 前記液体電解質は、硫酸水溶液であることを特徴とする請求項18に記載の方法。
- 湿式電解コンデンサであって、
アノードと、
金属基体、金属酸化物被膜、保護被膜、及び導電性ポリマー被膜を含むカソードと、
前記カソードとアノードとの間に、且つ前記カソードとアノードに接触して配置された液体電解質と、
を含むことを特徴とする湿式電解コンデンサ。 - 前記カソードは、ニオブ、タンタル、アルミニウム、チタン、ルテニウム、及びそれらの組合せからなる群から選択される金属を含むこと特徴とする請求項29に記載の湿式電解コンデンサ。
- 前記保護被膜は、前記金属酸化物被膜を被覆し、前記導電性ポリマー被膜は前記保護被膜を被覆すること特徴とする請求項29に記載の湿式電解コンデンサ。
- 前記コンデンサの散逸率は、約50%未満であること特徴とする請求項29に記載の湿式電解コンデンサ。
- 前記コンデンサの体積効率は、約10,000μF*V/ccよりも大きいこと特徴とする請求項29に記載の湿式電解コンデンサ。
- 前記コンデンサの体積効率は、約20,000μF*V/ccよりも大きいこと特徴とする請求項29に記載の湿式電解コンデンサ。
- 請求項18〜28のいずれか1項に記載の方法により製造された湿式電解コンデンサ。
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-
2005
- 2005-05-24 US US11/136,070 patent/US7099143B1/en not_active Expired - Fee Related
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2006
- 2006-05-23 JP JP2008513607A patent/JP5060471B2/ja not_active Expired - Fee Related
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- 2006-05-23 WO PCT/US2006/019842 patent/WO2006127663A2/en active Application Filing
- 2006-05-23 GB GB0722187A patent/GB2440478B/en not_active Expired - Fee Related
- 2006-05-23 CN CNA2006800178991A patent/CN101180695A/zh active Pending
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Also Published As
Publication number | Publication date |
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DE112006001194T9 (de) | 2009-02-05 |
GB2440478B (en) | 2011-01-05 |
HK1111261A1 (en) | 2008-08-01 |
CN101180695A (zh) | 2008-05-14 |
WO2006127663A3 (en) | 2007-05-31 |
US7099143B1 (en) | 2006-08-29 |
JP2008543054A (ja) | 2008-11-27 |
WO2006127663A2 (en) | 2006-11-30 |
US20060286761A1 (en) | 2006-12-21 |
GB0722187D0 (en) | 2007-12-27 |
DE112006001194T5 (de) | 2009-02-05 |
US7456073B2 (en) | 2008-11-25 |
GB2440478A (en) | 2008-01-30 |
GB2440478A8 (en) | 2008-07-01 |
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