JP2018517246A - 分散性向上及び抵抗減少のための二次電池用負極スラリー及びこれを含む負極 - Google Patents
分散性向上及び抵抗減少のための二次電池用負極スラリー及びこれを含む負極 Download PDFInfo
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- JP2018517246A JP2018517246A JP2017559667A JP2017559667A JP2018517246A JP 2018517246 A JP2018517246 A JP 2018517246A JP 2017559667 A JP2017559667 A JP 2017559667A JP 2017559667 A JP2017559667 A JP 2017559667A JP 2018517246 A JP2018517246 A JP 2018517246A
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- negative electrode
- cmc
- slurry
- secondary battery
- electrode slurry
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Classifications
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- 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
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
-
- 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
- H01M4/622—Binders being polymers
-
- 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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
Description
本出願は、2015年11月11日付韓国特許出願第10−2015−0158423号に基づく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た全ての内容は、本明細書の一部として含まれる。
負極活物質(タップ密度0.74g/ccの人造黒鉛)に対して、下記CMCを1.5wt%以上の割合で混合し、負極活物質−CMCスラリーを製造した。前記スラリーを蒸留水で5倍希釈した後、活物質に吸着されていないCMCを濾過させた後、TGA(熱重量分析機)を用いて活物質に比べて吸着されたCMC重量比率(吸着されたCMC重量/活物質−CMC総重量)を測定した。結果は下記表1に示す通りである。
水に負極活物質(タップ密度0.74g/ccの人造黒鉛)、導電材(アセチレンブラック)、前記増粘剤(CMC)及びバインダー(SBR)をそれぞれ(96.5−X)重量%、1.0重量%、X%、2.5重量%になるように混合して負極スラリーを製造した。
前記負極スラリーを厚さ10μmの負極集電体である銅(Cu)薄膜に塗布し、乾燥して負極を製造した後、ロールプレス(roll press)を行って負極を加工した。
正極活物質(LiNi0.6Mn0.2Co0.2O2)、バインダー(KF1100)、導電材(Super−C)をそれぞれ93:4:3の重量比で溶媒(N−methyl−2−pyrrolidone,NMP)に混合して正極スラリーを製造した。
前記二次電池用負極スラリーの製造において、製造例1のCMCを1.0重量%混合してリチウム二次電池を製造した。
製造例2のCMCを0.8重量%混合して負極スラリーを製造したことを除いては、実施例1と同じ方法でリチウム二次電池を製造した。
製造例3のCMCを0.9重量%混合して負極スラリーを製造したことを除いては、実施例1と同じ方法でリチウム二次電池を製造した。
製造例4のCMCを1.8重量%混合して負極スラリーを製造したことを除いては、実施例1と同じ方法でリチウム二次電池を製造した。
製造例4のCMCを1.4重量%混合して負極スラリーを製造したことを除いては、実施例1と同じ方法でリチウム二次電池を製造した。
製造例5のCMCを0.8重量%混合して負極スラリーを製造したことを除いては、実施例1と同じ方法でリチウム二次電池を製造した。
製造例6のCMCを1.2重量%混合して負極スラリーを製造したことを除いては、実施例1と同じ方法でリチウム二次電池を製造した。
前記実施例1から3及び比較例1から4による二次電池用負極スラリーのスラリー固形分を測定した。結果は下記表2に示す通りである。
前記実施例1から3及び比較例1から4による二次電池用負極スラリーのスラリー粘度を測定した。結果は下記表2に示す通りである。
前記実施例1から3及び比較例1から4による二次電池用負極スラリーのスラリー沈降率を測定した。結果は下記表2に示す通りである。スラリー沈降率は、スラリーの製造から4日後、スラリー中の固形分が沈殿した部分の高さを最初の高さで割って計算した。
前記実施例1から3及び比較例1から4によるリチウム二次電池のsingle layer pouch cellを製作した後、これに対し容量を基準に2.5Cの電流を30秒間流す電気化学的評価を介して抵抗を測定した。結果は下記表2に示す通りである。
Claims (16)
- 負極活物質及び増粘剤を含む負極スラリーであって、
前記負極活物質は、タップ密度(tap density)が1.0g/cc以下であり、
スラリー固形分の含量は、スラリー全体重量に比べて48wt%以上である
二次電池用負極スラリー。 - 前記増粘剤は、
カルボキシメチルセルロース(carboxy methyl cellulose,CMC)、メチルセルロース(methyl cellulose,MC)、ヒドロキシプロピルセルロース(hydroxypropyl cellulose,HPC)、メチルヒドロキシプロピルセルロース(methyl hydroxypropyl cellulose,MHPC)、エチルヒドロキシエチルセルロース(ethyl hydroxyethyl cellulose,EHEC)、メチルエチルヒドロキシエチルセルロース(methyl ethyl hydroxyethyl cellulose,MEHEC)及びセルロースガム(cellulose gum)からなる群より選択される一つ以上である
請求項1に記載の二次電池用負極スラリー。 - 前記増粘剤は、
カルボキシメチルセルロース(carboxy methyl cellulose,CMC)である
請求項1に記載の二次電池用負極スラリー。 - 前記カルボキシメチルセルロース(CMC)は、
負極活物質に対する吸着量が0.8から0.9wt%である
請求項3に記載の二次電池用負極スラリー。 - 前記カルボキシメチルセルロース(CMC)は、
置換度が0.7から1.3である
請求項3または4に記載の二次電池用負極スラリー。 - 前記カルボキシメチルセルロース(CMC)は、
置換度が0.7から0.9である
請求項3または4に記載の二次電池用負極スラリー。 - 前記カルボキシメチルセルロース(CMC)の重量平均分子量は、
70万から420万である
請求項3から6のいずれか1項に記載の二次電池用負極スラリー。 - 前記カルボキシメチルセルロース(CMC)の重量平均分子量は、
70万から350万である
請求項3から6のいずれか1項に記載の二次電池用負極スラリー。 - 前記カルボキシメチルセルロース(CMC)は、
重量平均分子量100万以下の低分子量CMC及び
重量平均分子量200万以上の高分子量CMCを含み、
前記低分子量CMCと前記高分子量CMCの配合比は、
1:3から3:1の重量比である
請求項3から8のいずれか1項に記載の二次電池用負極スラリー。 - 前記カルボキシメチルセルロース(CMC)は、
負極スラリー全体重量に比べて1wt%以下である
請求項3から9のいずれか1項に記載の二次電池用負極スラリー。 - 前記二次電池用負極スラリーのスラリー沈降率は、
7%以下である
請求項3から10のいずれか1項に記載の二次電池用負極スラリー。 - 請求項1から請求項11のいずれか一項に記載の二次電池用負極スラリーを含む
二次電池用負極。 - 正極、
負極、
電解液及び
分離膜を含む
リチウム二次電池であって、
前記負極は、
請求項12に記載の二次電池用負極である
リチウム二次電池。 - 請求項13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14に記載の電池モジュールを含む
電池パック。 - 前記電池パックは、パワーツール、電気自動車、ハイブリッド電気自動車、プラグインハイブリッド電気自動車及び電力貯蔵用システムからなる群より選択される1種以上の中大型デバイスの電源として用いられるものである
請求項15に記載の電池パック。
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PCT/KR2016/011767 WO2017082546A1 (ko) | 2015-11-11 | 2016-10-19 | 분산성 향상 및 저항 감소를 위한 이차전지용 음극 슬러리 및 이를 포함하는 음극 |
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KR102527050B1 (ko) * | 2019-06-07 | 2023-04-28 | 에스케이온 주식회사 | 이차전지용 전극의 제조방법 및 상기 전극을 포함하는 이차전지 |
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CN112072112A (zh) * | 2020-09-16 | 2020-12-11 | 远景动力技术(江苏)有限公司 | 电极增稠剂及其制备方法 |
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CN112072110B (zh) * | 2020-09-16 | 2022-09-20 | 远景动力技术(江苏)有限公司 | 负极、其制备方法及使用了其的锂离子电池 |
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