JP2011505663A - 多孔性コーティング層が形成されたセパレータ、その製造方法及びこれを備えた電気化学素子 - Google Patents
多孔性コーティング層が形成されたセパレータ、その製造方法及びこれを備えた電気化学素子 Download PDFInfo
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- JP2011505663A JP2011505663A JP2010535875A JP2010535875A JP2011505663A JP 2011505663 A JP2011505663 A JP 2011505663A JP 2010535875 A JP2010535875 A JP 2010535875A JP 2010535875 A JP2010535875 A JP 2010535875A JP 2011505663 A JP2011505663 A JP 2011505663A
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Images
Classifications
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
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Abstract
Description
1-1.セパレータの製造
下記化学式3に表される架橋性バインダー(TA10、2重量%)と架橋開始剤であるAIBN(0.04%wt/wt)とをアセトンに約30℃で約1時間溶解させた。この溶液に平均粒度が約1μmであるアルミナ粉末を全体固形分の20重量%濃度で添加し分散させた。以後、この混合溶液をディップコーティング法を利用して厚さ20μm程度のポリエチレン多孔性基材(気孔度35%)にコートし、90℃の乾燥オーブンで約10分間硬化及び乾燥を同時に行った。最終的に形成されたコーティング層の厚さは約2μm程度になるように調節した。気孔率測定装置(porosimeter)で測定した結果、ポリエチレン多孔性基材に形成された多孔性コーティング層内の気孔のサイズ及び気孔度はそれぞれ0.4μm及び40%であった。
カソード活物質としてLiCoO294重量%、導電材としてカーボンブラック(carbon black)3重量%、結合剤としてPVdF3重量%を溶剤であるN‐メチル‐2‐ピロリドン(NMP)に添加してカソード混合物スラリーを製造した。前記カソード混合物スラリーを、カソード集電体である厚さが20μm程度のアルミニウム(Al)薄膜に塗布、乾燥してカソードを製造した。
厚さ約20μmのポリエチレンテレフタレート不織布を多孔性基材として用いたことを除いては、前記実施例1と同一の方法でセパレータ及びリチウム二次電池を製造した。製造されたセパレータの多孔性コーティング層の気孔のサイズは0.6μm以下であり、気孔度は55%レベルであった。
架橋性バインダーと架橋開始剤の代わりに、PVdF‐HFPを2重量%で用いたことを除いては、前記実施例1と同一の方法でセパレータ及びリチウム二次電池を製造した。製造されたセパレータの多孔性コーティング層の気孔のサイズは0.5μm以下であり、気孔度は42%レベルであった。
実施例2で用いた架橋性バインダーと架橋開始剤の代わりに、PVdF‐HFPを2重量%で用いたことを除いては、実施例2と同一の方法でセパレータ及びリチウム二次電池を製造した。製造されたセパレータの多孔性コーティング層の気孔のサイズは0.8μm以下であり、気孔度は58%レベルであった。
実施例及び比較例による各電池を60℃の高温でそれぞれ1C/1C充・放電サイクル実験を行い、100、200、300サイクル後に測定した容量を初期容量で割った百分率値を表1に示した。
実施例及び比較例の電池を常温でそれぞれ0.2C、0.5C、1C、2Cの放電速度でサイクリングを行い、これらの放電容量をC‐rate特性毎に0.2C容量に対する百分率で計算して下記表2に記載した。
実施例及び比較例の電池を150℃及び160℃の高温でそれぞれ1時間及び2時間保存し、以後電池の状態を下記表3に記載した。
1b …不織布
3 …無機物粒子
5 …架橋された構造のバインダー
10 …セパレータ
20 …セパレータ
Claims (14)
- 多数の気孔を有する多孔性基材と、
前記多孔性基材の少なくとも一面にコートされており、多数の無機物粒子及びバインダーの混合物で形成された多孔性コーティング層とを備えてなるものであり、
前記バインダーが、架橋された構造のバインダーを包含してなることを特徴とする、セパレータ。 - 前記架橋された構造のバインダーが、3個以上の反応性基を有する高分子、3個以上の反応性基を有する低分子、またはこれらの混合物からなる群より選択されたバインダー間の反応によって架橋されたバインダーであることを特徴とする、請求項1に記載のセパレータ。
- 前記架橋された構造のバインダーが、2個以上の反応性基を有する高分子、2個以上の反応性基を有する低分子、またはこれらの混合物からなる群より選択されたバインダーが架橋剤によって互いに架橋されたバインダーであることを特徴とする、請求項1に記載のセパレータ。
- 前記バインダーが、前記架橋された構造のバインダー及び非架橋構造のバインダーの混合物であることを特徴とする、請求項1に記載のセパレータ。
- 前記非架橋構造のバインダーが、ポリビニリデンフルオライド‐ヘキサフルオロプロピレン(polyvinylidene fluoride‐co‐hexafluoropropylene)、ポリビニリデンフルオライド‐トリクロロエチレン(polyvinylidene fluoride‐co‐trichloroethylene)、ポリメチルメタクリレート(polymethylmethacrylate)、ポリアクリロニトリル(polyacrylonitrile)、ポリビニルピロリドン(polyvinylpyrrolidone)、ポリビニルアセテート(polyvinylacetate)、エチレンビニルアセテート共重合体(polyethylene‐co‐vinyl acetate)、ポリエチレンオキシド(polyethylene oxide)、セルロースアセテート(cellulose acetate)、セルロースアセテートブチレート(cellulose acetate butyrate)、セルロースアセテートプロピオネート(cellulose acetate propionate)、シアノエチルプルラン(cyanoethylpullulan)、シアノエチルポリビニルアルコール(cyanoethylpolyvinylalcohol)、シアノエチルセルロース(cyanoethylcellulose)、シアノエチルスクロース(cyanoethylsucrose)、プルラン(pullulan)、カルボキシルメチルセルロース(carboxyl methyl cellulose)、アクリロニトリルスチレンブタジエン共重合体(acrylonitrile‐styrene‐butadiene copolymer)及びポリイミド(polyimide)からなる群より選択された何れかの一種又は二種以上の混合物であることを特徴とする、請求項4に記載のセパレータ。
- 前記無機物粒子のサイズが、0.01ないし10μmであることを特徴とする、請求項1に記載のセパレータ。
- 前記無機物粒子と前記架橋された構造のバインダーとの重量比が50:50ないし99:1であることを特徴とする、請求項1に記載のセパレータ。
- 前記多孔性コーティング層の気孔のサイズが、0.01ないし10μmであり、前記多孔性コーティング層の気孔の気孔度が、5ないし95%であることを特徴とする、請求項1に記載のセパレータ。
- 前記多孔性基材が、ポリオレフィン系多孔性膜であることを特徴とする、請求項1に記載のセパレータ。
- 前記多孔性基材が、ポリエチレンテレフタレート(polyethyleneterephthalate)、ポリブチレンテレフタレート(polybutyleneterephthalate)、ポリエステル(polyester)、ポリアセタール(polyacetal)、ポリアミド(polyamide)、ポリカーボネート(polycarbonate)、ポリイミド(polyimide)、ポリエーテルエーテルケトン(polyetheretherketone)、ポリエーテルスルホン(polyethersulfone)、ポリフェニレンオキシド(polyphenyleneoxide)、ポリフェニレンスルフィドロ(polyphenylenesulfidro)及びポリエチレンナフタレン(polyethylenenaphthalene)からなる群より選択された何れか一種の高分子又は二種以上の混合物で形成された不織布であることを特徴とする、請求項1に記載のセパレータ。
- (S1)架橋性高分子、架橋性低分子及びこれらの混合物からなる群より選択された架橋性バインダー成分を含むコーティング液を用意する段階と;
(S2)前記コーティング液に無機物粒子を添加して無機物粒子が分散されたコーティング液を製造する段階と;
(S3)前記無機物粒子が分散されたコーティング液を多孔性基材の少なくとも一面に適用してコーティング層を形成する段階と;及び
(S4)前記コーティング層内の架橋性バインダー成分を架橋させて多孔性コーティング層を形成する段階を含んでなる、セパレータの製造方法。 - 前記架橋性バインダー成分が、3個以上の反応性基を有する高分子、3個以上の反応性基を有する低分子、またはこれらの混合物からなる群より選択された何れか一つであることを特徴とする、請求項11に記載のセパレータの製造方法。
- 前記コーティング液が、2個以上の反応性基を有する高分子、2個以上の反応性基を有する低分子、またはこれらの混合物からなる群より選択された架橋性バインダー成分及び架橋剤を含むことを特徴とする、請求項11に記載のセパレータの製造方法。
- 電気化学素子であって、
カソードと、アノードと、前記カソードとアノードとの間に介されたセパレータとを備えてなり、
前記セパレータが請求項1〜10のうち何れか一項に記載のセパレータであることを特徴とする、電気化学素子。
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PCT/KR2008/006944 WO2009069928A2 (en) | 2007-11-29 | 2008-11-25 | Separator having porous coating layer, method for manufacturing the same and electrochemical device having the same |
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KR101198493B1 (ko) | 2011-06-07 | 2012-11-06 | 한국과학기술원 | 홍합유래 고분자를 이용한 폴리올레핀 분리막의 열수축 방지방법, 이에 의하여 열 수축 특성이 향상된 폴리올레핀 분리막과 이를 포함하는 리튬이차전지 |
JP2012227066A (ja) * | 2011-04-21 | 2012-11-15 | Sony Corp | セパレータおよび非水電解質電池、ならびに電池パック、電子機器、電動車両、蓄電装置および電力システム |
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JP2013235824A (ja) * | 2012-05-10 | 2013-11-21 | Samsung Sdi Co Ltd | セパレータおよびその製造方法と前記セパレータを含むリチウム2次電池 |
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JP2014002954A (ja) * | 2012-06-20 | 2014-01-09 | Sumitomo Chemical Co Ltd | セパレータの製造方法及び非水電解液二次電池 |
WO2014073451A1 (ja) | 2012-11-06 | 2014-05-15 | 積水化学工業株式会社 | 耐熱性合成樹脂微多孔フィルム及びその製造方法、非水電解液二次電池用セパレータ並びに非水電解液二次電池 |
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JP2012227066A (ja) * | 2011-04-21 | 2012-11-15 | Sony Corp | セパレータおよび非水電解質電池、ならびに電池パック、電子機器、電動車両、蓄電装置および電力システム |
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JP2017191777A (ja) * | 2016-04-14 | 2017-10-19 | 三星エスディアイ株式会社Samsung SDI Co., Ltd. | 多孔性耐熱層組成物、多孔性耐熱層を含む分離膜、および該分離膜を用いた電気化学電池 |
JP2019527751A (ja) * | 2016-07-22 | 2019-10-03 | セルガード エルエルシー | 改良されたコーティング、被覆セパレータ、電池、および関連する方法 |
KR20190120081A (ko) * | 2018-04-13 | 2019-10-23 | 주식회사 엘지화학 | 후처리 가교에 의한 분리막의 물성 향상 방법 및 이에 의한 분리막 |
KR102314366B1 (ko) | 2018-04-13 | 2021-10-20 | 주식회사 엘지에너지솔루션 | 후처리 가교에 의한 분리막의 물성 향상 방법 및 이에 의한 분리막 |
Also Published As
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KR20090056811A (ko) | 2009-06-03 |
US10916754B2 (en) | 2021-02-09 |
CN101874319B (zh) | 2014-07-23 |
KR101002161B1 (ko) | 2010-12-17 |
WO2009069928A2 (en) | 2009-06-04 |
TW200935644A (en) | 2009-08-16 |
EP2225787B1 (en) | 2014-04-16 |
TWI467832B (zh) | 2015-01-01 |
US20100316903A1 (en) | 2010-12-16 |
EP2225787A4 (en) | 2013-03-06 |
WO2009069928A3 (en) | 2009-08-27 |
EP2225787A2 (en) | 2010-09-08 |
CN101874319A (zh) | 2010-10-27 |
JP5551077B2 (ja) | 2014-07-16 |
US20160056438A1 (en) | 2016-02-25 |
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