JP2018503946A - リチウム二次電池の正極形成用組成物の製造方法、及びこれを利用して製造した正極及びリチウム二次電池 - Google Patents
リチウム二次電池の正極形成用組成物の製造方法、及びこれを利用して製造した正極及びリチウム二次電池 Download PDFInfo
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- JP2018503946A JP2018503946A JP2017533443A JP2017533443A JP2018503946A JP 2018503946 A JP2018503946 A JP 2018503946A JP 2017533443 A JP2017533443 A JP 2017533443A JP 2017533443 A JP2017533443 A JP 2017533443A JP 2018503946 A JP2018503946 A JP 2018503946A
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- positive electrode
- lithium secondary
- secondary battery
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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Classifications
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- 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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- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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- H—ELECTRICITY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/626—Metals
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- 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
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Abstract
Description
本出願は、2015年1月13日付韓国特許出願第2015−0005960号及び2016年1月12日付韓国特許出願第2016−0003822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。
本発明の一実施形態に係るリチウム二次電池の正極形成用組成物の製造方法において、段階1は、分散剤を利用して導電材を溶媒中で先ず分散させる段階である。
一方、本発明の一実施形態に係るリチウム二次電池の正極形成用組成物の製造方法において、段階2は、前記段階1で製造した第1分散液に粉末状バインダを添加して分散させる段階である。
また、本発明の一実施形態に係るリチウム二次電池の正極形成用組成物の製造方法において、段階3は、前記段階2で製造した第2分散液に正極活物質を添加して正極形成用組成物を製造する段階である。
[製造例1:正極形成用組成物の製造]
カーボンナノ繊維導電材(平均粒径(D50):30nm、比表面積:300m2/g、縦横比:1.2)20重量部とカルボキシメチルセルロース(CMC)分散剤(Mw:2,500,000g/mol)10重量部を、N−メチルピロリドン(NMP)溶媒(正極形成用組成物の製造時に用いられる溶媒量の90体積%)中で均質分散器(homo disperser、TKミキサ)を利用して2500rpmで30分間混合、分散させた。以後、クリアミキサを利用して15,000rpmで5分ずつ4回の混合工程をさらに実施して第1分散液を製造した。結果の第1分散液に、分子内のカルボキシ基を1モル%で含むPVdFバインダ粉末(重量平均分子量(Mw)=880kg/mol、平均粒径(D50)0.5um)20重量部を添加したあと、残量のNMP溶媒を更に添加し、均質混合器を利用して25℃で2,500rpmで1時間の間混合して第2分散液を製造した。前記第2分散液にLi(Ni0.6Mn0.2Co0.2)O2正極活物質(平均粒径(D50)50nm)100重量部を投入したあと、均質分散器を利用して2,500rpmで1時間の間混合して正極形成用組成物(粘度:1,500cps)を製造した。前記正極形成用組成物の製造に用いられた各構成成分の使用量は、正極活物質の使用量を、100重量部を基準にして表した相対値である。
バインダとして分子内水素結合性官能基を含まないPVdFバインダ粉末(重量平均分子量(Mw)=880kg/mol、平均粒径(D50)0.5um)を用いることを除き、前記製造例1と同様の方法で行って正極形成用組成物を製造した。
前記製造例1及び2で製造した正極活物質形成用組成物をそれぞれ利用して実施例1及び2のリチウム二次電池を製造した。
N−メチルピロリドン(NMP)溶媒の中に溶解させた分子内カルボキシ基を含むPVdFバインダ溶液を、バインダ固形分の含量を基準に20重量部、カーボンナノ繊維導電材(平均粒径(D50):30nm、比表面積:300m2/g、縦横比:1.2)20重量部及びCMC分散剤(Mw:2,500,000g/mol)10重量部と均質分散器を利用して2,500rpmで30分間混合した。以後、クリアミキサを利用して15,000rpmで5分ずつ4回の混合工程をさらに実施して第1分散液を製造した。結果の第1分散液にLi(Ni0.6Mn0.2Co0.2)O2正極活物質の100重量部を投入したあと、均質分散器を利用して25℃で2500rpmで1時間の間混合して正極形成用組成物を製造した。
前記実施例1及び比較例のリチウム二次電池の製造過程で製造した正極に対し、イオンミリング(ion milling)を利用して加工したあと、電界放射型電子顕微鏡(field emission scanning electron microscopy、FE−SEM)を利用して正極活物質層の断面構造を観察した。その結果を図2a〜図2c及び図3a〜図3cに示した。
前記実施例1及び比較例で製造したリチウム二次電池に対し、常温(25℃)及び低温(10℃)での抵抗減少効果を評価した。
前記実施例1及び比較例で製造したリチウム二次電池に対し、接着力及び面抵抗を測定した。
本発明に係る正極形成用組成物の製造時に用いられるバインダの分子量及び官能基の含量に応じた接着力改善の効果を測定した。
Claims (20)
- 導電材と分散剤を溶媒の中で1次分散させて第1分散液を準備する段階;
前記第1分散液に粉末状のバインダを添加し、2次分散させて第2分散液を準備する段階;及び
前記第2分散液に正極活物質を添加して混合する段階
を含むリチウム二次電池の正極形成用組成物の製造方法。 - 前記導電材の平均粒径が正極活物質の平均粒径の60%から80%のものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記導電材は、1超過の縦横比を有するものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記導電材は、正極活物質100重量部に対して1から20重量部で用いられるものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記分散剤は、セルロース系化合物のものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記分散剤は、重量平均分子量が2,000,000g/molから3,000,000g/molであるカルボキシメチルセルロースルを含むものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記分散剤は、正極活物質100重量部に対して0.1から10重量部で用いられるものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記1次分散は、回転速度1,000rpmから5,000rpmで第1分散工程が行われたあと、回転速度10,000rpmから25,000rpmのジェット気流によって第2分散工程が行われる多段階分散工程のものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記バインダは、フッ素系高分子を含むものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記バインダは、200kg/molから1000kg/molの重量平均分子量を有するフッ素系高分子を含むものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記バインダは、分子内にカルボキシ基、ヒドロキシ基、エステル基、スルホン酸基及びグリシジル基からなる群より選択されるいずれか一つまたは二つ以上の水素結合性官能基を有するフッ素系高分子を含むものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記バインダは、分子内水素結合性官能基を0.1から1モル%で含むフッ素系高分子を含むものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記バインダの平均粒径が0.3から0.7umのものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記バインダは、正極活物質100重量部に対して1から30重量部で含まれるものである請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 前記粉末状のバインダを添加したあと、2次分散の前に溶媒をさらに添加する工程を含む請求項1に記載のリチウム二次電池の正極形成用組成物の製造方法。
- 請求項1から請求項15のいずれか一項に記載の製造方法によって製造されたリチウム二次電池の正極形成用組成物。
- 請求項16に記載の正極形成用組成物を利用して製造され、
正極活物質、導電材、粉末状バインダ及び分散剤を含み、前記粉末状バインダは正極活物質及び導電材と点接触しているリチウム二次電池用正極。 - 請求項17に記載の正極を含むものであるリチウム二次電池。
- 請求項18に記載のリチウム二次電池を単位セルとして含む電池モジュール。
- 請求項19に記載の電池モジュールを含む電池パック。
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JP6517344B2 (ja) | 2019-05-22 |
CN107112524B (zh) | 2020-04-28 |
KR101773698B1 (ko) | 2017-08-31 |
CN107112524A (zh) | 2017-08-29 |
US20170338468A1 (en) | 2017-11-23 |
KR20160087353A (ko) | 2016-07-21 |
US10290859B2 (en) | 2019-05-14 |
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