JP2021508157A - 正極及び該正極を含む二次電池 - Google Patents
正極及び該正極を含む二次電池 Download PDFInfo
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- JP2021508157A JP2021508157A JP2020534964A JP2020534964A JP2021508157A JP 2021508157 A JP2021508157 A JP 2021508157A JP 2020534964 A JP2020534964 A JP 2020534964A JP 2020534964 A JP2020534964 A JP 2020534964A JP 2021508157 A JP2021508157 A JP 2021508157A
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- JP
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- Prior art keywords
- positive electrode
- walled carbon
- active material
- carbon nanotubes
- electrode active
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
-
- 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
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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Abstract
Description
本出願は、2018年2月7日付出願された韓国特許出願第10−2018−0015313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た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よる正極は、集電体及び前記集電体上に配置された正極活物質層を含み、前記正極活物質層は、正極活物質、バインダー、及び多重壁炭素ナノチューブを含み、前記多重壁炭素ナノチューブの平均長さは1μmから2μmであり、前記多重壁炭素ナノチューブの長さの標準偏差は0.5μm以下であってよい。
本発明の他の実施形態による正極の製造方法は、導電材分散液を準備する段階と、導電材分散液、正極活物質、バインダー、及び溶媒を含む正極スラリーを形成する段階と、前記正極スラリーを集電体上に塗布及び乾燥する段階とを含み、前記導電材分散液は、多重壁炭素ナノチューブ、分散剤、及び分散媒を含み、前記多重壁炭素ナノチューブの平均長さは1μmから2μmであり、前記多重壁炭素ナノチューブの長さの標準偏差は0.5μm以下であってよい。
本発明のまた他の実施形態による二次電池は、正極、負極、前記正極と前記負極との間に介在された分離膜、及び電解質を含んでよい。ここで、前記正極は上述した一実施形態の正極と同一であるため説明を省略する。
実施例1:電池の製造
(1)導電材分散液の製造
数cmの大きさのペレット形態のバンドル型多重壁炭素ナノチューブ、分散剤であるH−NBR、分散媒であるNMPを4:0.8:95.2の重量比で混合し混合物を形成した。前記混合物を、0.65mmの大きさのビード80%が充填されたスパイクミルに投入して分散させ、2kg/minの吐出速度で排出させた。このような工程を2回行い、粒度分布が調節された多重壁炭素ナノチューブを含めた導電材分散液を製造した。
正極活物質としてLi(Ni0.6Mn0.2Co0.2)O2を、バインダーとしてPVdFを用いた。前記正極活物質、前記導電材分散液、及びNMPを混合して、固形分が72%であり、且つ前記正極活物質、バインダー、分散剤、多重壁炭素ナノチューブの重量比が98:1.52:0.08:0.4である正極スラリーを製造した。
負極活物質である人造黒鉛、負極導電材であるカーボンブラック、負極バインダーであるスチレンブタジエンゴム(SBR)とCMCを、それぞれ96.1:0.5:2.3:1.1の重量比で蒸留水に混合して負極スラリーを製造した。製造されたスラリーを、厚さが20μmである負極集電体(Cu)に重量(ローディング量)が10mg/cm2になるように塗布及び乾燥した。以後、前記正極スラリーが形成された集電体をロール圧延方法で圧延し、最終厚さ(集電体+活物質階)が80μmになるように調節した。以後、前記集電体を110℃の真空オーブンで6時間乾燥させて負極を製造した。
導電材分散液の製造時、ビードの大きさを1mmに変更したことを除いては、実施例1と同一の方法で導電材分散液、正極、電池を製造した。
導電材分散液の製造時、ビードの大きさを1mmに変更し工程回数を1回にしたことを除いては、実施例1と同一の方法で導電材分散液、正極、電池を製造した。
導電材分散液の製造時、ミリング回数を4回に変更したことを除いては、実施例1と同一の方法で導電材分散液、正極、電池を製造した。
実施例1、2及び比較例1、2で製造された二次電池それぞれに対して充電/放電を行い、放電容量及び電池抵抗を評価した後、図5のグラフ及び表2に示した。
充電条件:CC(定電流)/CV(定電圧)(4.2V/0.05C current cut−off)
放電条件:CC(定電流)条件2.7V
Claims (7)
- 集電体及び前記集電体上に配置された正極活物質層を含み、
前記正極活物質層は、正極活物質、バインダー、及び多重壁炭素ナノチューブを含み、
前記多重壁炭素ナノチューブの平均長さは1μmから2μmであり、
前記多重壁炭素ナノチューブ長さの標準偏差は0.5μm以下である正極。 - 前記多重壁炭素ナノチューブの長さは0.5μmから3.0μmである、請求項1に記載の正極。
- 前記多重壁炭素ナノチューブは、前記正極活物質層の全重量を基準に0.1重量%から1重量%で含まれる、請求項1に記載の正極。
- 前記多重壁炭素ナノチューブは、前記正極活物質層の全重量を基準に0.2重量%から0.7重量%で含まれる、請求項1に記載の正極。
- 前記正極活物質は、前記正極活物質層の全重量を基準に96重量%から99重量%で含まれる、請求項1に記載の正極。
- 前記正極活物質層のローディング量は15mg/cm2から40mg/cm2である、請求項1に記載の正極。
- 請求項1から6の何れか一つに記載の正極と、
負極と、
前記正極と前記負極との間に介在された分離膜と、
電解質とを含む二次電池。
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