JP7037017B2 - リチウム電極の製造方法 - Google Patents
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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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- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
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Description
本発明は、電池のエネルギー密度を増加することができるリチウム電極の製造方法に係り、(S1)基材上にリチウム金属保護用高分子をコーティングして保護層を形成する段階;(S2)前記保護層上にリチウム金属を蒸着してリチウム金属層を形成する段階;及び(S3)前記保護層上に形成された前記リチウム金属層を集電体に転写する段階;を含むリチウム電極の製造方法に関する。
(S1)段階
(S1)段階では、基材上にリチウム金属保護用高分子をコーティングしてリチウム金属保護用保護層を形成することができる。
(S2)段階では、前記保護層上にリチウム金属を蒸着してリチウム金属層を形成することができる。
(S3)段階では、前記保護層上に形成された前記リチウム金属層を集電体に転写することができる。この時、転写は前記基材、保護層及びリチウム金属層が順に積層された構造体を巻取した後、ロールプレスのような装置を利用して集電体上に前記リチウム金属層を転写させることができる。
基材として両面に離型層が形成された異形PETフィルム(SKC Haas社製 RX12G 50μm)を準備した。
実施例1と同様に実施するが、保護層形成用高分子としてPVDF-HFPの代わりにPVDFを利用してPVDF保護層を形成した。
Cu集電体上にリチウム金属を直接蒸着してリチウム金属層を形成した後、前記リチウム金属層上にPVDF-HFPコーティング液を塗布してリチウム電極を製造した。この時、蒸着工程は、600℃の温度で真空蒸着法(Evaporation Deposition)によって実施して厚さ12μmのリチウム金属層を形成し、前記PVDF-HFPコーティング液は、NMP溶媒にPVDF-HFP(Arkema社製LBG Grade)を溶解させて5%溶液になるようにして製造し、スピンコーティングで前記リチウム金属層上にPVDF-HFP保護層を形成した。
リチウム金属層として、圧延によって製造されたリチウム金属(Honzo社、日本)を準備した。
テトラヒドロフラン(THF)に溶解させた2M塩化リチウム(2M Cl in THF)溶液に20μm厚さの銅ホイル(2cm×2cm)を主電極、白金線(Pt wire)を相対電極、マグネシウムホイルを基準電極にして浸漬した。
実施例1、2の場合、正常なリチウム電極が製造されたことを確認した。
実施例1と比較例2、3でそれぞれ製造されたリチウム電極を負極に適用したHohsen 2032コインセルを製造してサイクル性能を比べてみた。正極は、LNF社のLF-X20Nを使用し、電解液はFEC(fluoroethylene carbonate)とDMC(dimethyl carbonate)を2:8vol%の割合で混合した溶液にLiPF6 1M、VC(vinylene carbonate)を1wt%添加したものを使った。分離膜はSK innovation社のLC2001を使った。充電条件は、4.25V CC/CV条件で行い、放電は3.0V CCの条件で進めた。充電と放電時のC-rateは、それぞれ0.2C、0.5Cであった。
10a、10b:離型層
20:保護層
30:リチウム金属層
Claims (6)
- (S1)両面に離型層が形成された基材上にリチウム金属保護用高分子をコーティングして保護層を形成する段階;
(S2)前記保護層上にリチウム金属を蒸着してリチウム金属層を形成する段階;及び
(S3)前記保護層上に形成された前記リチウム金属層を集電体に転写する段階;を含み、
前記保護層は、PVDF(Poly Vinylidene Fluoride)、PVDF-HFPコポリマー(Poly Vinylidene Fluoride- hexafluoroethylne copolymer)、シクロオレフィンコポリマー(Cyclo olefin copolymer)及びSBR-CMC(Styrene Butadiene Rubber - Carboxymethyl Cellulose)からなる群から選択される1種以上を含む、リチウム電極の製造方法。 - 前記基材は、ポリエチレンテレフタレート(polyethylene terephthalate、PET)、ポリイミド(polyimide、PI)、ポリメチルメタクリレート(poly(methylmethacrylate)、PMMA)、TAC(cellulose tri-acetate)、ポリプロピレン(Polypropylene)、ポリエチレン(Polyethylene)及びポリカーボネート(Polycarbonate)からなる群から選択される1種以上を含む請求項1に記載のリチウム電極の製造方法。
- 前記蒸着は、真空蒸着法(evaporation deposition)、化学気相蒸着法(CVD、chemical vapor deposition)、及び物理蒸着法(physical vapor deposition)の中で選択される方法によって実施される請求項1に記載のリチウム電極の製造方法。
- 前記リチウム金属層の厚さは、5μmないし50μmである請求項1に記載のリチウム電極の製造方法。
- 前記集電体は、銅、アルミニウム、ニッケル、チタン、焼成炭素及びステンレススチールからなる群から選択される1種を含む請求項1に記載のリチウム電極の製造方法。
- 前記リチウム電極は、集電体;前記集電体上に形成されたリチウム金属層;及び前記リチウム金属層上に形成された保護層を含む請求項1に記載のリチウム電極の製造方法。
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KR1020170094471A KR102148507B1 (ko) | 2017-07-26 | 2017-07-26 | 리튬 전극 및 이의 제조방법 |
KR10-2017-0094471 | 2017-07-26 | ||
PCT/KR2018/007577 WO2019022403A1 (ko) | 2017-07-26 | 2018-07-04 | 리튬 전극의 제조방법 |
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JP2020501322A JP2020501322A (ja) | 2020-01-16 |
JP7037017B2 true JP7037017B2 (ja) | 2022-03-16 |
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EP (1) | EP3547416A4 (ja) |
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WO2024011535A1 (zh) * | 2022-07-14 | 2024-01-18 | 扬州纳力新材料科技有限公司 | 铝复合集流体及其制备方法和应用 |
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CN110249461B (zh) | 2022-06-10 |
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