JP7244626B2 - リチウム二次電池用正極活物質、その製造方法及びこれを含むリチウム二次電池 - Google Patents
リチウム二次電池用正極活物質、その製造方法及びこれを含むリチウム二次電池 Download PDFInfo
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Description
先ず、硫黄(sulfur)と平均粒度が57.27μmで絡まった(entangled)形状を有するカーボンナノチューブを7.5:2.5の重量比で混合した後、155℃で30分間反応させて第1活物質複合体を製造し、また、硫黄と平均粒度が22.59μmで束(bundle)形状を有するカーボンナノチューブを7.5:2.5の重量比で混合した後、155℃で30分間反応させて第2活物質複合体を製造した。次いで、前記製造された第1活物質複合体と第2活物質複合体を8:2の重量比でスラリーを製造する時、1,500rpmの速度で撹拌混合して正極活物質を製造した。
第1活物質複合体と第2活物質複合体を8:2の重量比の代わりに5:5の重量比に変更して混合したことを除いては、前記実施例1と同様に行って、正極活物質を製造した。
第1活物質複合体と第2活物質複合体を8:2の重量比の代わりに2:8の重量比に変更して混合したことを除いては、前記実施例1と同様に行って、正極活物質を製造した。
硫黄と平均粒度が57.27μmで絡まった(entangled)形状を有するカーボンナノチューブを7.5:2.5の重量比で混合した後、155℃で30分間反応させて正極活物質を製造した(すなわち、前記実施例1の第1活物質複合体に該当)。
硫黄と平均粒度が22.59μmで束(bundle)形状を有するカーボンナノチューブを7.5:2.5の重量比で混合した後、155℃で30分間反応させて正極活物質を製造した(すなわち、前記実施例1の第2活物質複合体に該当)。
リチウム‐硫黄電池用正極の製造
前記実施例1ないし3、比較例1及び2でそれぞれ製造された正極活物質、導電材でsuper‐P及びバインダーでポリフッ化ビニリデン(PVdF)を88:5:7の重量比で混合し、NMP溶媒に分散させてスラリーを製造した後、これをアルミニウム集電体(Al foil)に500μmの厚さでコーティングした後、120℃の真空オーブンで13時間乾燥してリチウム‐硫黄電池用正極を製造した。
前記製造された正極を負極(Li metal foil)と対面するように位置させた後、その間にポリエチレン分離膜を介在し、次いで、ジメチルエーテル溶媒に4M濃度でLiFSIが溶解された電解液を注入してリチウム‐硫黄電池を製造した。
[実験例1]電池の寿命特性評価
前記実施例4ないし6、比較例3及び4で製造されたリチウム‐硫黄電池の充放電を繰り返すことによる残余容量を確認し、各リチウム‐硫黄電池の寿命特性を評価した。図1は本発明の一実施例によるリチウム‐硫黄電池と比較例によるリチウム‐硫黄電池の寿命特性を比較対照したグラフで、図2は本発明の一実施例によるリチウム‐硫黄電池と比較例によるリチウム‐硫黄電池の充電プロファイルを比較対照したグラフである。
Claims (12)
- 硫黄が炭素材に担持された2種以上の活物質複合体を含み、
前記炭素材はカーボンナノチューブで、その形状は絡まりタイプまたは束タイプであり、
前記2種以上の活物質複合体のいずれか一種の活物質複合体に含まれた炭素材は、他の種の活物質複合体に含まれた炭素材と平均粒度及び形状が異なることを特徴とするリチウム二次電池用正極活物質。 - 前記正極活物質は2種の活物質複合体が含まれたもので、前記2種の活物質複合体は1:9ないし9:1の重量比で含まれ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正極活物質。
- 前記炭素材の平均粒度は2μmないし200μmであることを特徴とする、請求項1又は2に記載のリチウム二次電池用正極活物質。
- 前記2種の活物質複合体のうち、いずれか一種の活物質複合体に含まれた炭素材は平均粒度が5μmないし40μmで、他の一種の活物質複合体に含まれた炭素材は平均粒度が15μmないし90μmであることを特徴とする、請求項2に記載のリチウム二次電池用正極活物質。
- 前記2種の活物質複合体のうち、いずれか一種の活物質複合体に含まれた炭素材は平均粒度が5μm以上ないし25μm未満で、他の一種の活物質複合体に含まれた炭素材は平均粒度が25μm以上ないし90μm以下であることを特徴とする、請求項2に記載のリチウム二次電池用正極活物質。
- 前記2種の活物質複合体のうち、いずれか一種の活物質複合体に含まれた炭素材の平均粒度と、他の一種の活物質複合体に含まれた炭素材の平均粒度の差は5μmないし65μmであることを特徴とする、請求項2、4、又は5に記載のリチウム二次電池用正極活物質。
- 前記絡まりタイプのカーボンナノチューブカーボンナノチューブはアスペクト比が1ないし2の粒子を含み、前記束タイプのカーボンナノチューブはアスペクト比が2を超過する粒子を含むことを特徴とする、請求項1~6のいずれか一項に記載のリチウム二次電池用正極活物質。
- (a)平均粒度及び形状が相異なる2種以上の炭素材のそれぞれを硫黄と混合及び反応させ、前記炭素材それぞれに硫黄が担持された2種以上の活物質複合体を製造する段階;及び
(b)前記製造された2種以上の活物質複合体を混合する段階;
を含むリチウム二次電池用正極活物質の製造方法。 - 前記活物質複合体は2種の活物質複合体が含まれたもので、前記2種の活物質複合体は1:9ないし9:1の重量比で混合されることを特徴とする、請求項8に記載のリチウム二次電池用正極活物質の製造方法。
- 前記反応は120℃ないし200℃の温度で5分間ないし60分間行われることを特徴とする、請求項8又は9に記載のリチウム二次電池用正極活物質の製造方法。
- 請求項1~7のいずれか一項に記載のリチウム二次電池用正極活物質を含む正極;リチウム系負極;前記正極と負極の間に介在される電解質;及び分離膜;を含むリチウム二次電池。
- 前記リチウム二次電池はリチウム‐硫黄電池であることを特徴とする、請求項11に記載のリチウム二次電池。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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KR10-2018-0136482 | 2018-11-08 | ||
KR20180136482 | 2018-11-08 | ||
KR1020190133909A KR20200053403A (ko) | 2018-11-08 | 2019-10-25 | 리튬 이차전지용 양극 활물질, 그 제조방법 및 이를 포함하는 리튬 이차전지 |
KR10-2019-0133909 | 2019-10-25 | ||
PCT/KR2019/014328 WO2020096253A1 (ko) | 2018-11-08 | 2019-10-29 | 리튬 이차전지용 양극 활물질, 그 제조방법 및 이를 포함하는 리튬 이차전지 |
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JP2021533551A JP2021533551A (ja) | 2021-12-02 |
JP7244626B2 true JP7244626B2 (ja) | 2023-03-22 |
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EP (1) | EP3817103A4 (ja) |
JP (1) | JP7244626B2 (ja) |
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KR102637750B1 (ko) * | 2022-08-31 | 2024-02-16 | 주식회사 엘지에너지솔루션 | 리튬황 전지용 양극재 이를 포함하는 리튬황 전지 |
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CN104600265B (zh) | 2015-01-06 | 2017-09-29 | 中国科学院化学研究所 | 一种碳硫复合正极材料及其制备方法 |
JP2018500741A (ja) | 2014-12-22 | 2018-01-11 | オキシス エナジー リミテッド | リチウム/硫黄電池用のカソード |
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KR101737217B1 (ko) * | 2014-09-26 | 2017-05-18 | 주식회사 엘지화학 | 황-탄소나노튜브 복합체, 이의 제조방법, 이를 포함하는 리튬-황 전지용 캐소드 활물질 및 이를 포함한 리튬-황 전지 |
CN106207097A (zh) * | 2016-07-30 | 2016-12-07 | 肖丽芳 | 一种锂硫电池极片及其电池的制备方法 |
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- 2019-10-29 CN CN201980051112.0A patent/CN112514112B/zh active Active
- 2019-10-29 JP JP2021507886A patent/JP7244626B2/ja active Active
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JP2018500741A (ja) | 2014-12-22 | 2018-01-11 | オキシス エナジー リミテッド | リチウム/硫黄電池用のカソード |
CN104600265B (zh) | 2015-01-06 | 2017-09-29 | 中国科学院化学研究所 | 一种碳硫复合正极材料及其制备方法 |
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JP2021533551A (ja) | 2021-12-02 |
CN112514112B (zh) | 2024-04-16 |
EP3817103A4 (en) | 2021-08-04 |
CN112514112A (zh) | 2021-03-16 |
KR20200053403A (ko) | 2020-05-18 |
EP3817103A1 (en) | 2021-05-05 |
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