JP2021507488A - リチウム二次電池用絶縁層形成用組成物、及びそれを利用したリチウム二次電池用電極の製造方法 - Google Patents
リチウム二次電池用絶縁層形成用組成物、及びそれを利用したリチウム二次電池用電極の製造方法 Download PDFInfo
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- JP2021507488A JP2021507488A JP2020536773A JP2020536773A JP2021507488A JP 2021507488 A JP2021507488 A JP 2021507488A JP 2020536773 A JP2020536773 A JP 2020536773A JP 2020536773 A JP2020536773 A JP 2020536773A JP 2021507488 A JP2021507488 A JP 2021507488A
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- Prior art keywords
- insulating layer
- secondary battery
- lithium secondary
- composition
- active material
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 124
- 239000000203 mixture Substances 0.000 title claims abstract description 118
- 238000004519 manufacturing process Methods 0.000 title claims description 29
- 238000000034 method Methods 0.000 title claims description 28
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- 229920000642 polymer Polymers 0.000 claims abstract description 24
- 239000002904 solvent Substances 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims description 300
- 239000007772 electrode material Substances 0.000 claims description 120
- 239000002002 slurry Substances 0.000 claims description 26
- 239000011149 active material Substances 0.000 claims description 21
- 239000011254 layer-forming composition Substances 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 9
- 229910021645 metal ion Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
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- CASZBAVUIZZLOB-UHFFFAOYSA-N lithium iron(2+) oxygen(2-) Chemical class [O-2].[Fe+2].[Li+] CASZBAVUIZZLOB-UHFFFAOYSA-N 0.000 description 1
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- 229910000686 lithium vanadium oxide Inorganic materials 0.000 description 1
- ACFSQHQYDZIPRL-UHFFFAOYSA-N lithium;bis(1,1,2,2,2-pentafluoroethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)C(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)C(F)(F)F ACFSQHQYDZIPRL-UHFFFAOYSA-N 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
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- 239000004005 microsphere Substances 0.000 description 1
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- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
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- 239000000843 powder Substances 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- IZMJMCDDWKSTTK-UHFFFAOYSA-N quinoline yellow Chemical compound C1=CC=CC2=NC(C3C(C4=CC=CC=C4C3=O)=O)=CC=C21 IZMJMCDDWKSTTK-UHFFFAOYSA-N 0.000 description 1
- 239000001008 quinone-imine dye Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000002153 silicon-carbon composite material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
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- 239000002356 single layer Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000006234 thermal black Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000002733 tin-carbon composite material Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical group 0.000 description 1
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000001018 xanthene dye Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本出願は、2018年2月1日付韓国特許出願第10−2018−0013009号に基づいた優先権の利益を主張し、当該韓国特許出願の文献に開示されている全ての内容は本明細書の一部として含まれる。
本発明の絶縁層形成用組成物は、(1)バインダー高分子、(2)有機染料(organic dye)、油溶性染料(oil soluble dye)及び有機蛍光体(organic phosphor)からなる群より選択される少なくとも1種を含む着色剤、及び(3)溶媒を含み、25℃での粘度が1,000cP以上である。
また、本発明は、前述したリチウム二次電池用絶縁層形成用組成物で形成された絶縁層を含むリチウム二次電池用電極を提供する。
また、本発明は、前述したリチウム二次電池用絶縁層形成用組成物を利用するリチウム二次電池用電極の製造方法を提供する。
前記電極集電体は、前述した電極集電体と同一の種類、材料、厚さなどで用いられてよい。
また、本発明は、前述したリチウム二次電池用電極を含むリチウム二次電池を提供する。
実施例1:リチウム二次電池用絶縁層形成用組成物の製造
バインダー高分子としてポリビニリデンフルオリド(製品名:KF9700、製造社:Kureha、重量平均分子量:880,000)9重量部、着色剤としてベンジリデン系有機染料のyellow 081(BASF社製)0.1重量部をメチルピロリドン(NMP)100重量部に溶解させて絶縁層形成用組成物を製造した。このとき、前記絶縁層形成用組成物の粘度は6,000cPであった。
バインダー高分子としてポリビニリデンフルオリド(製品名:KF9700、製造社:Kureha、重量平均分子量:880,000)9重量部、着色剤としてアゾ系有機染料のred 395(BASF社製)0.1重量部をメチルピロリドン(NMP)100重量部に溶解させて絶縁層形成用組成物を製造した。このとき、前記絶縁層形成用組成物の粘度は6,000cPであった。
バインダー高分子としてポリビニリデンフルオリド(製品名:KF9700、製造社:Kureha、重量平均分子量:880,000)10.5重量部、着色剤としてベンジリデン系有機染料のyellow 081(BASF社製)0.1重量部をメチルピロリドン(NMP)100重量部に溶解させて絶縁層形成用組成物を製造した。このとき、前記絶縁層形成用組成物の粘度は12,000cPであった。
バインダー高分子としてポリビニリデンフルオリド(製品名:KF1100、製造社:Kureha、重量平均分子量:280,000)12重量部、着色剤としてベンジリデン系有機染料のyellow 081(BASF社製)0.1重量部をメチルピロリドン(NMP)100重量部に溶解させて絶縁層形成用組成物を製造した。このとき、前記絶縁層形成用組成物の粘度は670cPであった。
バインダー高分子としてポリビニリデンフルオリド(製品名:KF9700、製造社:Kureha、重量平均分子量:880,000)6重量部、着色剤として顔料(製品名:yellow 139、製造社:BASF)0.08重量部、分散剤としてCR−V(製造社:信越化学)1.5重量部をメチルピロリドン100重量部に溶解させることで、粘度が1,000cPである絶縁層形成用組成物を製造した。
実験例1:SEM観察の評価
実施例1及び比較例1によって製造された絶縁層形成用組成物を用いてリチウム二次電池用正極を製造した。
アルミニウムホイル上に実施例1及び実施例2の絶縁層形成用組成物をコーティングし、5cm×5cmの大きさに切断し、これらを、LiPF6 1.0モルが溶解され、エチレンカーボネート(EC)とエチルメチルカーボネート(EMC)を3:7の体積比で混合した非水電解液溶媒に18時間常温で含浸させ、着色剤が電解液に溶出されるのか否かを実験した。実験の後、実施例1の結果を図3に、実施例2の結果を図4にそれぞれ示した。
実施例1及び比較例2による絶縁層形成用組成物を常温(25℃)で31日間置いて組成物の液安定性を評価し、実施例1の観察結果を図5に、比較例1の観察結果を図6に示した。
アルミニウムホイル上に実施例1及び実施例3の絶縁層形成用組成物を幅3.8mmでコーティング及び乾燥して絶縁層を形成し、表面検査機器((株)アンシス社製)で外観を観察した。実施例1の表面検査写真を図7に示し、実施例3の表面検査写真を図8に示した。
アルミニウムホイル上に実施例1及び実施例3の絶縁層形成用組成物を幅3.8mmでコーティング及び乾燥して絶縁層を形成し、その外観を光学顕微鏡で観察した。実施例1の光学顕微鏡観察写真を図9に示し、実施例3の光学顕微鏡観察写真を図10に示した。図9及び図10において、黄色に見える部分が絶縁層形成用組成物のコーティング部分である。
Claims (14)
- バインダー高分子と、
有機染料、油溶性染料及び有機蛍光体からなる群より選択される少なくとも1種を含む着色剤と、
溶媒とを含んでなり、
25℃での粘度が1,000cP以上である、リチウム二次電池用絶縁層形成用組成物。 - 前記25℃での粘度が1,000cPから10,000cPである、請求項1に記載のリチウム二次電池用絶縁層形成用組成物。
- 前記着色剤の前記溶媒に対する溶解度は25℃で300g/Lから500g/Lである、請求項1に記載のリチウム二次電池用絶縁層形成用組成物。
- 前記着色剤は、前記溶媒100重量部に対し0.01重量部から10重量部で含まれる、請求項1に記載のリチウム二次電池用絶縁層形成用組成物。
- 前記着色剤は金属イオンをさらに含んでなり、
前記金属イオンは、前記有機染料、前記油溶性染料及び有機蛍光体からなる群より選択される少なくとも1種と錯塩(complex salt)構造を形成する、請求項1に記載のリチウム二次電池用絶縁層形成用組成物。 - 前記金属イオンは、銅、コバルト、クロム、ニッケル及び/または鉄からなる群より選択される少なくとも1種の金属のイオンである、請求項5に記載のリチウム二次電池用絶縁層形成用組成物。
- 前記バインダー高分子は、前記溶媒100重量部に対し5重量部から15重量部で含まれる、請求項1に記載のリチウム二次電池用絶縁層形成用組成物。
- 前記リチウム二次電池用絶縁層形成用組成物の固形分の含量は5重量%から15重量%である、請求項1に記載のリチウム二次電池用絶縁層形成用組成物。
- 電極集電体と、
前記電極集電体上に形成される電極活物質層と、
前記電極集電体上に形成され、前記電極活物質層と一部の領域で重畳するように形成される絶縁層とを含んでなり、
前記絶縁層は、請求項1に記載のリチウム二次電池用絶縁層形成用組成物で形成される、リチウム二次電池用電極。 - 電極集電体上に活物質スラリー組成物を塗布して未乾燥電極活物質層を形成するステップと、
前記未乾燥電極活物質層と一部の領域で重畳するように請求項1に記載のリチウム二次電池用絶縁層形成用組成物を塗布して未乾燥絶縁層を形成するステップと、
前記未乾燥電極活物質層と前記未乾燥絶縁層を同時に乾燥させるステップとを含む、リチウム二次電池用電極の製造方法。 - 前記活物質スラリー組成物と前記絶縁層形成用組成物の25℃での粘度の差異は5,000cP以下である、請求項10に記載のリチウム二次電池用電極の製造方法。
- 前記活物質スラリー組成物の25℃での粘度は5,000cPから15,000cPである、請求項11に記載のリチウム二次電池用電極の製造方法。
- 前記活物質スラリー組成物は、前記バインダー高分子と同一の高分子物質を含む、請求項10に記載のリチウム二次電池用電極の製造方法。
- 請求項9に記載のリチウム二次電池用電極を含む、リチウム二次電池。
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EP4418396A1 (en) * | 2022-06-14 | 2024-08-21 | LG Energy Solution, Ltd. | Electrode assembly for lithium secondary battery, method for producing same, and lithium secondary battery comprising same |
CN117882241A (zh) * | 2022-06-17 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | 浆料及其制备方法和应用、二次电池的组件及其制备方法、隔离膜卷及其制备方法、电极组件的制造方法及设备、二次电池及用电设备 |
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CN116154416B (zh) * | 2023-04-24 | 2023-07-18 | 宁德时代新能源科技股份有限公司 | 极片、电极组件、电池单体、电池及用电设备 |
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KR102274362B1 (ko) | 2021-07-07 |
HUE062655T2 (hu) | 2023-11-28 |
EP3726631A1 (en) | 2020-10-21 |
JP6980978B2 (ja) | 2021-12-15 |
WO2019151831A1 (ko) | 2019-08-08 |
US20200388850A1 (en) | 2020-12-10 |
US11621440B2 (en) | 2023-04-04 |
CN111587502B (zh) | 2023-07-14 |
KR20190093522A (ko) | 2019-08-09 |
ES2953069T3 (es) | 2023-11-07 |
EP3726631A4 (en) | 2021-01-06 |
EP3726631B1 (en) | 2023-08-02 |
CN111587502A (zh) | 2020-08-25 |
PL3726631T3 (pl) | 2023-10-02 |
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