JP7045555B2 - リチウム金属負極構造体の製造方法およびリチウム金属負極構造体 - Google Patents
リチウム金属負極構造体の製造方法およびリチウム金属負極構造体 Download PDFInfo
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- JP7045555B2 JP7045555B2 JP2019559099A JP2019559099A JP7045555B2 JP 7045555 B2 JP7045555 B2 JP 7045555B2 JP 2019559099 A JP2019559099 A JP 2019559099A JP 2019559099 A JP2019559099 A JP 2019559099A JP 7045555 B2 JP7045555 B2 JP 7045555B2
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- lithium metal
- negative electrode
- electrode structure
- metal negative
- current collector
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- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
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- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 1
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- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
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Images
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- 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
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
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Description
本出願は、2017年10月27日付韓国特許出願第10-2017-0141502号及び2018年9月5日付韓国特許出願第10-2018-0105740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すべての内容は本明細書の一部として含まれている。
(a)集電体の一面または両面にタブが形成される無地部を集電体の一側に含むようにリチウム金属層のコーティング部を形成して積層体を製造する工程;
(b)前記無地部とリチウム金属層のコーティング部の段差部に、光硬化性物質を塗布して硬化させるか、絶縁テープを付着する工程;および
(c)リチウム金属負極構造体を製造するために、前記積層体を単位電極に打ち抜く工程;
を含むことを特徴とする。
集電体;
前記集電体から垂直に延びたタブ;および
前記タブを除いた集電体の一面または両面に形成されたリチウム金属層;
を含み、
前記タブとリチウム金属層の段差部に、光硬化性物質からなる絶縁層が形成されているか、または絶縁テープが付着していてもよい。
銅からなる集電体(厚さ:30μm)上にタブの形成のための無地部が残るように一側を除いてリチウム金属を蒸着(厚さ:40μm)して負極シートを製造した。
銅からなる集電体(厚さ:30μm)上にタブの形成のための無地部が残るように一側を除いてリチウム金属を蒸着(厚さ:40μm)して負極シートを製造し、リチウム金属が形成されたコーティング部と無地部の段差部に絶縁テープ(厚さ:500nm)をテーピング(コーティング部と無地部の境界線を含んで幅:3mm、長さは後に形成されるタブの長さと同一にテーピング)した。
銅からなる集電体(厚さ:30μm)上にタブの形成のための無地部が残るように一側を除いてリチウム金属を蒸着(厚さ:40μm)して負極シートを製造し、リチウム金属が形成されたコーティング部と無地部の段差部に、光硬化性物質としてエトキシレーテッドトリメチロールプロパントリアクリレート(ETPTA:ethoxylated trimethylopropane triacrylate、粘度:60cps)と架橋剤として3-(トリメトキシシリル)プロピルアクリレート(TMSPA:3-(trimethoxysilyl)propylacrylate)、および光開始剤として2-ヒドロキシ-2-メチルプロピオフェノン(2-hydroxy-2-methylpropiophenone)を重量比10:0.5:0.5で混ぜた混合物を塗布(厚さ:500nm、コーティング部と無地部の境界線を含んで幅:3mm、長さは後に形成されるタブの長さと同一に塗布)し、UV硬化方式で硬化させた。
正極活物質として正極活物質(LiCoO2)90重量%、Super-P(導電材)5重量%、およびPVDF(結着剤)5重量%組成の正極合剤を溶剤であるN-メチル-2-ピロリドン(NMP:N-methyl-2-pyrrolidone)に添加して正極スラリーを製造した後、アルミニウム集電体上にコートして正極を製造した。
Claims (18)
- リチウム金属負極構造体を製造する方法であって、
(a)集電体の一面または両面に、タブが形成される無地部を集電体の一側に含むようにリチウム金属層のコーティング部を形成して積層体を製造する工程;
(b)前記無地部とリチウム金属層のコーティング部の段差部に、光硬化性物質を塗布して硬化させるか、絶縁テープを付着する工程;および
(c)リチウム金属負極構造体を製造するために前記積層体を単位電極に打ち抜く工程;
を含み、
前記光硬化性物質の塗布の厚さまたは絶縁性テープの厚さは、10nm~1μmである、リチウム金属負極構造体の製造方法。 - 前記工程(c)と同時に無地部を打ち抜いてタブを形成する工程を含む、請求項1に記載のリチウム金属負極構造体の製造方法。
- 前記工程(c)以後に、
(d)無地部を打ち抜いてタブを形成する工程を含む、請求項1に記載のリチウム金属負極構造体の製造方法。 - 前記段差部は、集電体の無地部とリチウム金属層が形成されたコーティング部の境界線に対して垂直な、且つ、集電体とリチウム金属層の積層方向に対して垂直な方向の幅が2mm~5mmの部位である、請求項1から3の何れか一項に記載のリチウム金属負極構造体の製造方法。
- 前記光硬化性物質は、紫外線硬化性物質であり、紫外線を照射して硬化させる、請求項1から4の何れか一項に記載のリチウム金属負極構造体の製造方法。
- 前記紫外線硬化性物質は、10cps~100cpsの粘度を有するオリゴマーまたは重合体の形態で付加された後、紫外線を照射して硬化する、請求項5に記載のリチウム金属負極構造体の製造方法。
- 前記オリゴマーは、エポキシ系、ウレタン系、アクリレート系、シリコン系、ヒドロキシル系、およびアクリル酸誘導体からなる群より選ばれる一つ以上であり、重合体は、不飽和ポリエステル系物質、およびポリアクリレート系物質からなる群より選ばれる一つ以上である、請求項6に記載のリチウム金属負極構造体の製造方法。
- 前記光硬化性物質の塗布の厚さまたは絶縁性テープの厚さは、100nm~500nmである、請求項1から7の何れか一項に記載のリチウム金属負極構造体の製造方法。
- 前記集電体は、銅、銅合金、ステンレススチール、アルミニウム、またはニッケルである、請求項1から8の何れか一項に記載のリチウム金属負極構造体の製造方法。
- 前記リチウム金属層は、
20~100μmの厚さを有する、請求項1から9の何れか一項に記載のリチウム金属負極構造体の製造方法。 - 前記工程(a)は、集電体にリチウム金属を蒸着または圧延して行われる、請求項1から10の何れか一項に記載のリチウム金属負極構造体の製造方法。
- 集電体;
前記集電体から延びたタブ;および
前記タブを除いた集電体の一面または両面に形成されたリチウム金属層;
を含み、
前記タブとリチウム金属層の段差部に、光硬化性物質からなる絶縁層が形成されているか、または絶縁テープが付着しており、
前記絶縁層または絶縁テープの厚さが、10nm~1μmである、リチウム金属負極構造体。 - 前記タブは、集電体と一体に形成されている、請求項12に記載のリチウム金属負極構造体。
- 前記絶縁層または絶縁テープは、リチウム金属層の端部とタブの端部を覆う形態で形成されている、請求項12又は13に記載のリチウム金属負極構造体。
- 前記絶縁層または絶縁テープの幅は、リチウム金属層とタブの境界線に対して垂直な、且つ、集電体とリチウム金属層の積層方向に対して垂直な方向に2mm~5mmである、請求項12から14の何れか一項に記載のリチウム金属負極構造体。
- リチウム金属層とタブの境界線に対して平行な方向において、前記絶縁層または絶縁テープの寸法は、タブの幅と同じである、請求項12から15の何れか一項に記載のリチウム金属負極構造体。
- 前記絶縁層または絶縁テープの厚さは、100nm~500nmである、請求項12から16の何れか一項に記載のリチウム金属負極構造体。
- 請求項12によるリチウム金属負極構造体を含む、二次電池。
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