JP6860129B2 - 二次電池用電極の気孔分布測定方法 - Google Patents
二次電池用電極の気孔分布測定方法 Download PDFInfo
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- 239000011148 porous material Substances 0.000 title claims description 141
- 238000009826 distribution Methods 0.000 title claims description 49
- 238000000034 method Methods 0.000 title claims description 22
- 239000011230 binding agent Substances 0.000 claims description 59
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 claims description 54
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 40
- 229910052710 silicon Inorganic materials 0.000 claims description 40
- 239000010703 silicon Substances 0.000 claims description 40
- 238000013507 mapping Methods 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 20
- 238000010884 ion-beam technique Methods 0.000 claims description 19
- 238000000992 sputter etching Methods 0.000 claims description 16
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 13
- 238000004043 dyeing Methods 0.000 claims description 13
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 239000007772 electrode material Substances 0.000 claims description 12
- 229920005573 silicon-containing polymer Polymers 0.000 claims description 12
- 239000004020 conductor Substances 0.000 claims description 8
- -1 polydimethylsiloxane Polymers 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 150000002908 osmium compounds Chemical class 0.000 claims description 4
- 238000010186 staining Methods 0.000 claims description 4
- 239000011883 electrode binding agent Substances 0.000 claims description 3
- 229920000548 poly(silane) polymer Polymers 0.000 claims description 3
- 229920001709 polysilazane Polymers 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 150000003304 ruthenium compounds Chemical class 0.000 claims description 3
- 239000000470 constituent Substances 0.000 description 26
- 229920000642 polymer Polymers 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 16
- 239000000126 substance Substances 0.000 description 10
- 229910052762 osmium Inorganic materials 0.000 description 8
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 8
- 238000000441 X-ray spectroscopy Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000007773 negative electrode material Substances 0.000 description 6
- 239000011149 active material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000004445 quantitative analysis Methods 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229920005822 acrylic binder Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910000487 osmium oxide Inorganic materials 0.000 description 1
- JIWAALDUIFCBLV-UHFFFAOYSA-N oxoosmium Chemical compound [Os]=O JIWAALDUIFCBLV-UHFFFAOYSA-N 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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Description
[反応式1]
また、本発明の一実施態様による二次電池用電極の気孔分布測定方法は、二次電池用の正極および負極に適用されることができる。
二次電池用負極(LG CHEM社)を準備し、染色材としてOsO4、ケイ素を含む高分子としてポリジメチルシロキサン(Polydimethylsiloxane;PDMS)を準備した。準備したOsO4を用いて二次電池用負極のバインダーを染色し、二次電池用負極を準備したPDMSに含浸させ、二次電池用負極の気孔をPDMSで充填した。その後、アルゴンイオンビームを照射するイオンミリング装置(IM 4000、Hitachi社)を用いて前記二次電池用負極に集束アルゴン(Ar)イオンビームを照射して表面を削ってきれいな断面を有する負極断面試料を製造した。アルゴンイオンビームの照射時、放電電流を400μA、イオンビーム電流を130μAにして行い、気体流量(gas flow)は1cm3/分であり、3時間行った。
前記実施例1と同様の二次電池用負極を準備し、二次電池用負極のバインダーを染色していない状態で、ポリジメチルシロキサンで二次電池用負極の気孔を充填したことを除いては、前記実施例1と同様の方法により負極断面試料を製造した。
前記実施例1と同様の二次電池用負極を準備し、OsO4で二次電池用負極のバインダーを染色し、エポキシを含む高分子で二次電池用負極の気孔を充填したことを除いては、前記実施例1と同様の方法により負極断面試料を製造した。
前記実施例1と同様の二次電池用負極を準備し、二次電池用負極のバインダーを染色せず、ケイ素を含む高分子で二次電池用負極の気孔を充填していないことを除いては、前記実施例1と同様の方法により負極断面試料を製造した。
前記実施例1と同様の二次電池用負極を準備し、二次電池用負極のバインダーを染色せず、エポキシを含む高分子で二次電池用負極の気孔を充填したことを除いては、前記実施例1と同様の方法により負極断面試料を製造した。
本発明の実施例1、実施例2および比較例1〜比較例3で製造された負極断面試料を走査電子顕微鏡(SU8020、HITACHI社)で観察し、SEM写真を撮影した。
実施例1で製造された負極断面試料を走査電子顕微鏡(SU8020、HITACHI社)に付属しているエネルギー分散型X線スペクトロスコピーを用いて、二次電池用負極の気孔に充填されているPDMSのケイ素成分を検出し、二次電池用負極のバインダーに染色されたOsO4染色材のオスミウム成分を検出した。その後、検出されたケイ素およびオスミウムの地点が表示されたEDSマッピングイメージを抽出した。その後、抽出されたEDSマッピングイメージをイメージプロセッシング(image processing)に適用して気孔の定量分析のためのイメージを抽出した。この時、エネルギー分散型X線スペクトロスコピーとして、5.9keV以上136keV以下のエネルギー分解能を有し、0.1wt%の最小検出限界を有するものを用いた。
Claims (7)
- 電極活物質、バインダーおよび導電材を含む二次電池用電極を準備するステップ、
ケイ素を含む高分子を前記二次電池用電極に含浸して、前記二次電池用電極の内部気孔に前記ケイ素を含む高分子を充填するステップ、
イオンミリング装置のイオンビームを前記二次電池用電極に照射して電極断面試料を製造するステップ、
エネルギー分散型X線スペクトロスコピーを用いて前記電極断面試料に存在するケイ素を検出するステップ、および
前記エネルギー分散型X線スペクトロスコピーにより検出されたケイ素の地点がマッピングされたイメージを分析して気孔の分布を確認するステップ
を含み、
前記電極断面試料を製造するステップの前に、
前記バインダーを染色するステップをさらに含む、二次電池用電極の気孔分布測定方法。 - 前記ケイ素を含む高分子は、ポリジメチルシロキサン、ポリシロキサン、ポリシランおよびポリシラザンからなる群より選択される1種以上を含む、請求項1に記載の二次電池用電極の気孔分布測定方法。
- 前記バインダーを染色するステップは、オスミウム化合物およびルテニウム化合物のうち少なくとも一つを含む染色材を用いて前記バインダーを染色する、請求項1または2に記載の二次電池用電極の気孔分布測定方法。
- エネルギー分散型X線スペクトロスコピーを用いて前記バインダー内の染色材を検出するステップ、および
前記エネルギー分散型X線スペクトロスコピーにより検出された染色材の地点がマッピングされたイメージを分析してバインダーの面積比率を計算するステップをさらに含む、請求項3に記載の二次電池用電極の気孔分布測定方法。 - 前記イオンビームはアルゴンイオンビームである、請求項1から4のいずれか一項に記載の二次電池用電極の気孔分布測定方法。
- 前記イオンミリング装置のイオンビーム電流は100μA以上250μA以下である、請求項1から5のいずれか一項に記載の二次電池用電極の気孔分布測定方法。
- 前記イオンミリング装置の放電電流は250μA以上450μA以下である、請求項1から6のいずれか一項に記載の二次電池用電極の気孔分布測定方法。
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KR20170065845 | 2017-05-29 | ||
KR10-2017-0065845 | 2017-05-29 | ||
PCT/KR2018/006076 WO2018221929A1 (ko) | 2017-05-29 | 2018-05-29 | 이차 전지용 전극의 기공 분포 측정 방법 |
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JP2020507889A JP2020507889A (ja) | 2020-03-12 |
JP6860129B2 true JP6860129B2 (ja) | 2021-04-14 |
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