JP6645705B2 - リチウム二次電池用電極スラリーの製造方法 - Google Patents
リチウム二次電池用電極スラリーの製造方法 Download PDFInfo
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- JP6645705B2 JP6645705B2 JP2017563303A JP2017563303A JP6645705B2 JP 6645705 B2 JP6645705 B2 JP 6645705B2 JP 2017563303 A JP2017563303 A JP 2017563303A JP 2017563303 A JP2017563303 A JP 2017563303A JP 6645705 B2 JP6645705 B2 JP 6645705B2
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- electrode slurry
- electrode
- binder
- slurry
- secondary battery
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Images
Classifications
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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
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
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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
- 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
- H01—ELECTRIC ELEMENTS
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Description
本出願は、2016年3月29日付韓国特許出願第10−2016−0037706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。
前記第1電極スラリー及び第2バインダーを含む第2電極スラリーを2次ミキシングする段階を含む二次電池用電極スラリーの製造方法を提供する。
前記第1電極スラリー及び第2バインダーを含む第2電極スラリーを2次ミキシングする段階を含む二次電池用電極スラリーの製造方法を提供する。
本発明の二次電池用電極スラリーを、正極活物質、導電材及びバインダーがそれぞれ94.5:3.2:2.3の重量比となるように製造した。
前記実施例1において、第1バインダー及び第2バインダーの含量比を7.7:2.3にしたことを除き、実施例1と同様の方法で正極スラリーを製造した。
前記実施例1において、第1バインダー及び第2バインダーの含量比を8.8:1.2にしたことを除き、実施例1と同様の方法で正極スラリーを製造した。
前記実施例1において、バインダーの投入量を調節することなく一度に添加したことを除き、実施例1と同様の方法で正極スラリーを製造した。
前記実施例1において、第1バインダー及び第2バインダーの含量比を5.6:4.4にしたことを除き、実施例1と同様の方法で正極スラリーを製造した。
前記実施例及び比較例に基づいて製造された正極スラリーの固形分及び粘度を測定した結果を下記表1に示した。固形分は、スラリーの全体重量を基準にしたスラリー内の固体成分の重量比であって、実際用いたそれぞれの配合量による(固体成分の重さ)/(固体成分の重さ + 液体成分の重さ)で計算し、最終のスラリーをオーブンで乾燥させて溶媒(NMP)を全部除去した後に残った重さを測定する方法で測定した。粘度は、B型粘度計を利用して25℃で12RPMのせん断速度で測定した。
前記実施例及び比較例に基づいて製造された正極スラリーの粘度を評価するため、正極スラリーに引張力を加えて伸張方向への破断時間を測定した(EXTENSION RATE:2.2MM/SEC)。
Claims (5)
- 電極活物質と、導電材と、バインダー溶液の一部(第1バインダー)とを含む第1電極スラリーを1次ミキシングし、1次ミキシングの後に測定された前記第1電極スラリーの粘度が10,000から60,000CPSになるように調整する段階;及び、
前記第1電極スラリーと、前記バインダー溶液の残り(第2バインダー)とを含む第2電極スラリーを2次ミキシングする段階を含み、
前記第1電極スラリーの固形分濃度は72から74%であり、
前記第1バインダー及び前記第2バインダーの含量比は7.7:2.3から6.6:3.4であり、
前記2次ミキシングの後に測定された前記第2電極スラリーの粘度は8,000から12,000CPSである、
二次電池用電極スラリーの製造方法。 - 前記2次ミキシングの後に測定された前記第2電極スラリーの粘度は8,000から9,400CPSである、
請求項1に記載の二次電池用電極スラリーの製造方法。 - 前記第1バインダー及び第2バインダーは、ビニリデンフルオリド−ヘキサフルオロプロピレンコポリマー(PVDF−CO−HEP)、ポリビニリデンフルオリド(POLYVINYLIDENEFLUORIDE)、ポリアクリロニトリル(POLYACRYLONITRILE)、ポリメチルメタクリレート(POLYMETHYLMETHACRYLATE)、ポリビニルアルコール、カルボキシメチルセルロース(CMC)、澱粉、ヒドロキシプロピルセルロース、再生セルロース、ポリビニルピロリドン、テトラフルオロエチレン、ポリエチレン、ポリプロピレン、ポリアクリル酸、エチレン−プロピレン−ジエンモノマー(EPDM)、スルホン化EPDM、ポリテトラフルオロエチレン(PTFE)またはポリビニリデンフルオリド(PVDF)などの非水系バインダー;アクリロニトリル−ブタジエンゴム、スチレン−ブタジエンゴム(STYRENE BUTADIENE RUBBER;SBR)またはアクリルゴムなどの水系バインダー;及び、ヒドロキシエチルセルロース、カルボキシメチルセルロースまたはポリビニリデンフルオリドなどの高分子樹脂からなる群より選択される一つ以上である
請求項1または2に記載の二次電池用電極スラリーの製造方法。 - 前記製造方法は、
前記第1電極スラリーまたは前記第2電極スラリーに増粘剤を投入する段階を
さらに含む
請求項1から3のいずれか1項に記載の二次電池用電極スラリーの製造方法。 - 前記第1電極スラリーの電極または前記第2電極スラリーの電極は、
正極または負極である
請求項1から4のいずれか1項に記載の二次電池用電極スラリーの製造方法。
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