JP6768242B2 - 分離膜及びこれを含むリチウム−硫黄電池 - Google Patents
分離膜及びこれを含むリチウム−硫黄電池 Download PDFInfo
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Description
また、本発明は、前記リチウム−硫黄電池用分離膜を含むリチウム−硫黄電池を提供する。
実施例1
(1)分離膜製造
多孔性基材として16μmのポリプロピレン(気孔度50%)フィルムを準備した。
電気伝導性を有してい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して混合し、硫黄−炭素複合体を得た。正極活物質スラリー全体重量に対して、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を製造した。
追加で第2コーティング液を使用して窒化ホウ素層をさらに形成したことを除いて、前記実施例1と同様に行って酸化グラフェン層/窒化ホウ素層/酸化グラフェン層/窒化ホウ素層の4層構造を有する多層コーティング層(総厚さ約2.5±0.5μm)が形成された分離膜及びこれを備えたリチウム−硫黄電池を製造した。
第1コーティング液及び第2コーティング液のコーティング手順を異にしたことを除いて、前記実施例1と同様に行って窒化ホウ素層/酸化グラフェン層/窒化ホウ素層の3層構造を有する多層コーティング層(総厚さ約2.5±0.5μm)が形成された分離膜及びこれを備えたリチウム−硫黄電池を製造した。
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で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−硫黄電池を製造した。
コーティング層で酸化グラフェンを単独で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−硫黄電池を製造した。
前記実施例及び比較例で製造されたリチウム−硫黄電池を0.3C/0.5C充電/放電で条件下で駆動し、初期充放電容量を測定し、200回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 (11)
- 多孔性基材;及び
これの少なくとも一面に形成され、酸化グラフェン層と窒化ホウ素層が積層された多層コーティング層を含み、
前記多層コーティング層は、総厚さが0.5μm〜5μmであることを特徴とするリチウム−硫黄電池用分離膜。 - 前記多孔性基材は、厚さが3ないし100μmであることを特徴とする請求項1に記載のリチウム−硫黄電池用分離膜。
- 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ゾビスオキサゾール、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に記載のリチウム−硫黄電池用分離膜。
- 前記多層コーティング層は、層の総数が2ないし10個からなることを特徴とする請求項1に記載のリチウム−硫黄電池用分離膜。
- 前記酸化グラフェン層の厚さは、0.5nm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−硫黄電池用分離膜。
- 前記酸化グラフェンは、厚さが0.5ないし100nmで、長さが0.1ないし10μmであって、板状のシートまたはフレークであることを特徴とする請求項1に記載のリチウム−硫黄電池用分離膜。
- 前記窒化ホウ素は、厚さが0.05ないし2μmで、長さが0.1ないし10μmであって、板状のシートまたはフレークであることを特徴とする請求項1に記載のリチウム−硫黄電池用分離膜。
- 前記多層コーティング層の最上層は酸化グラフェン層であることを特徴とする請求項1に記載のリチウム−硫黄電池用分離膜。
- 前記多層コーティング層は、バインダー、イオン伝導性高分子及びリチウム塩からなる群から選択された1種以上をさらに含むことを特徴とする請求項1に記載のリチウム−硫黄電池用分離膜。
- 前記多層コーティング層は、酸化グラフェン層と窒化ホウ素層が交互に積層されたことを特徴とする請求項1に記載のリチウム−硫黄電池用分離膜。
- 請求項1ないし10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−硫黄電池。
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KR1020160180436A KR102115599B1 (ko) | 2016-12-27 | 2016-12-27 | 분리막 및 이를 포함하는 리튬-황 전지 |
KR10-2016-0180436 | 2016-12-27 | ||
PCT/KR2017/015248 WO2018124636A1 (ko) | 2016-12-27 | 2017-12-21 | 분리막 및 이를 포함하는 리튬-황 전지 |
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KR102415167B1 (ko) * | 2018-10-26 | 2022-07-01 | 주식회사 엘지에너지솔루션 | 기능성 분리막, 그 제조 방법 및 이를 포함하는 리튬 이차전지 |
WO2020085859A1 (ko) * | 2018-10-26 | 2020-04-30 | 주식회사 엘지화학 | 기능성 분리막, 그 제조 방법 및 이를 포함하는 리튬 이차전지 |
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CN111416089B (zh) * | 2020-04-10 | 2022-06-10 | 吉林师范大学 | 一种诱导和抑制锂枝晶生长的复合隔膜及制备方法和使用该隔膜的锂离子电池 |
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CN106129455A (zh) * | 2016-08-30 | 2016-11-16 | 上海大学 | 锂硫电池 |
KR102115598B1 (ko) | 2016-12-27 | 2020-05-26 | 주식회사 엘지화학 | 분리막 및 이를 포함하는 리튬-황 전지 |
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