JP6937901B2 - 分離膜及びこれを含むリチウム二次電池 - Google Patents
分離膜及びこれを含むリチウム二次電池 Download PDFInfo
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Description
多孔性基材と、
前記多孔性基材の少なくとも一面に形成されたコーティング層とを含み、
前記コーティング層は、シート(sheet)形状の部分還元された酸化グラフェンとリチウムイオン伝導性高分子とを含むことを特徴とするリチウム二次電池用分離膜を提供する。
図1はリチウム二次電池10を示す断面図で、負極1にリチウム金属を、正極3に硫黄を含み、これらの間に分離膜5が配置された構造を有する。この時、電解質(未図示)は前記負極1と正極3の間の分離膜5に含浸された形態で存在する。
正極集電体は電池に化学的変化を引き起こさずに高い導電性を有するものであれば特に制限されず、例えば、ステンレススチール、アルミニウム、ニッケル、チタン、焼成炭素、またはアルミニウムやステンレススチールの表面にカーボン、ニッケル、チタン、銀などで表面処理したものなどが使用されてもよい。
実施例1
(1)分離膜製造
多孔性基材で20μmのポリエチレン(気孔度50%)フィルムを準備した。
400℃で熱処理したシート(sheet)形状の部分還元された酸化グラフェン(25μm粒径、グラフェン内の酸素原子の含量は15%)水分散液(0.002重量%濃度)とリチウム置換されたナフィオン(Lithiated Nafion)(Du Pont社)水分散液(0.25 mg/mL濃度)を混合した後、超音波を8時間印加してコーティング液を製造した(部分還元された酸化グラフェン:リチウム置換されたナフィオン=1:12.5の重量比)。
電気伝導性を有する導電性炭素と硫黄を導電性炭素:硫黄の重量比(wt%)30:70(21g:49g)でボールミル工程を通じて混合して硫黄−炭素複合体を得た。正極活物質スラリーの全体重量に対して、前記複合体を含む正極活物質70.0g、導電材としてSuper−P 20.0g、バインダーとしてポリフッ化ビニリデン10.0g及び溶媒としてN−メチル−2−ピロリドン500gの組成で正極活物質スラリーを製造した後、アルミニウム集電体上にコーティングして正極活性部を製造した。
25μm粒径と3μm粒径のシート形状の部分還元された酸化グラフェンを1:1の重量比で混合して使用したことを除いて、前記実施例1と同様に行ってリチウム二次電池を製造した。
3μm粒径のシート(sheet)形状の部分還元された酸化グラフェンを使用したことを除いて、前記実施例1と同様に行ってリチウム二次電池を製造した。
コーティング層を形成せずに、多孔性基材をそのまま分離膜を使用したことを除いて、前記実施例1と同様に行ってリチウム二次電池を製造した。
前記実施例及び比較例で製造されたリチウム二次電池を0.1C/0.1C(2.5サイクル)、[0.2C/0.2C(3サイクル)、0.3C/0.5C(10サイクル)反復]充電/放電する条件下で駆動し、初期充放電容量を測定し、160回のサイクルを行って容量変化を確認した。
1:負極
3:正極
5:分離膜
Claims (15)
- 多孔性基材と、
前記多孔性基材の少なくとも一面に形成されたコーティング層とを含み、
前記コーティング層は、シート(sheet)形状の部分還元された酸化グラフェンとリチウムイオン伝導性高分子とを含み、
前記部分還元された酸化グラフェンは直径が20ないし30μmの第1粒子と、直径が1ないし5μmの第2粒子を含み、
前記部分還元された酸化グラフェンは、第1粒子と第2粒子を重量比で1:1ないし10:1で混合したものであり、
前記リチウムイオン伝導性高分子は、ポリウレタン(polyurethane)、リチウム置換されたナフィオン(lithiated Nafion)、ポリエチレンオキシド(Polyethylene oxide)、ポリプロピレンオキシド(Polypropylene oxide)、ポリシロキサン(Polysiloxane)、ポリスチレン(polystyrene)及びポリエチレングリコール(polyethylene glycol)からなる群から選択される1種以上を含むことを特徴とするリチウム二次電池用分離膜。 - 前記部分還元された酸化グラフェンは厚さが0.1nmないし1μmであることを特徴とする請求項1に記載のリチウム二次電池用分離膜。
- 前記多孔性基材は、厚さが3μmないし100μmで、気孔の大きさが0.01μmないし10μmであることを特徴とする請求項1または2に記載のリチウム二次電池用分離膜。
- 前記多孔性基材は、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリアミド、ポリアセタール、ポリカーボネート、ポリイミド、ポリエーテルケトン、ポリエーテルスルホン、ポリフェニレンオキシド、ポリフェニレンスルフィド、ポリエチレンナフタレン、ポリテトラフルオロエチレン、ポリフッ化ビニリデン、ポリ塩化ビニル、ポリアクリロニトリル、セルロース、ナイロン、ポリパラフェニレンベンズビスオキサゾール、及びポリアリレートからなる群から選択された1種以上の材質を含むことを特徴とする請求項1から3のいずれか一項に記載のリチウム二次電池用分離膜。
- 前記コーティング層は、部分還元された酸化グラフェン及びリチウムイオン伝導性高分子が1:5ないし1:20の重量比で混合されたことを特徴とする請求項1から4のいずれか一項に記載のリチウム二次電池用分離膜。
- 前記コーティング層は、部分還元された酸化グラフェン及びリチウムイオン伝導性高分子が1:10ないし1:15の重量比で混合されたことを特徴とする請求項1から5のいずれか一項に記載のリチウム二次電池用分離膜。
- 前記コーティング層は厚さが50nmないし20μmであることを特徴とする請求項1から6のいずれか一項に記載のリチウム二次電池用分離膜。
- 前記コーティング層は厚さが100nmないし10μmであることを特徴とする請求項1から7のいずれか一項に記載のリチウム二次電池用分離膜。
- 前記コーティング層は厚さが200nmないし3μmであることを特徴とする請求項1から8のいずれか一項に記載のリチウム二次電池用分離膜。
- 前記部分還元された酸化グラフェンは、5ないし100μg/cm2でコーティングされることを特徴とする請求項1から9のいずれか一項に記載のリチウム二次電池用分離膜。
- 前記部分還元された酸化グラフェンは、5ないし40μg/cm2でコーティングされることを特徴とする請求項1から10のいずれか一項に記載のリチウム二次電池用分離膜。
- 前記部分還元された酸化グラフェンは、5ないし20μg/cm2でコーティングされることを特徴とする請求項1から11のいずれか一項に記載のリチウム二次電池用分離膜。
- 請求項1ないし請求項12のいずれか一項に記載の分離膜を含むことを特徴とするリチウム二次電池。
- 前記リチウム二次電池は、正極内に硫黄化合物を含むことを特徴とする請求項13に記載のリチウム二次電池。
- 前記コーティング層が、リチウム二次電池の正極に対向するように配置されたことを特徴とする請求項13または14に記載のリチウム二次電池。
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WO2020235971A1 (ko) * | 2019-05-23 | 2020-11-26 | 주식회사 엘지화학 | 리튬 이차 전지용 분리막, 이의 제조 방법, 및 이를 포함하는 리튬 이차 전지 |
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