KR20200050054A - 리튬 이차 전지용 음극, 이를 포함하는 리튬 이차 전지 및 이의 제조방법 - Google Patents
리튬 이차 전지용 음극, 이를 포함하는 리튬 이차 전지 및 이의 제조방법 Download PDFInfo
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Abstract
본 발명에 따른 음극은 리튬 박막과 음극 합제층 사이에 리튬 확산 속도 제어층을 구비함으로써 전리튬화 공정에서 리튬이 확산되는 속도를 제어할 수 있으며, 리튬의 손실 또는 리튬의 부반응을 억제하여 사이클 특성을 개선할 수 있다.
또한 본 발명의 제조방법에 따른 리튬 이차 전지의 제조방법은 원자층 증착법에 의해 두께가 매우 얇은 리튬 확산 속도 제어층을 형성시킴으로써, 리튬 확산 속도 제어층의 소재 특성상 가지는 저항 증가를 최소화하는 이점이 있다.
Description
도 2 및 도 3은 본 발명의 일 실시양태에 따른 음극을 제조하는 방법을 도식화하여 나타낸 것이다.
도 4 내지 도 8은 본 발명의 리튬 확산 속도 제어층의 형성을 위한 원자층 증착 공정을 나타낸 모식도이다.
| 전해액 주액 시점 | 구분 | Total dosage (mAh/cm2) |
| 셀 제작 후, 바로 주액 | 비교예 1 | 1.40 |
| 실시예 1 | 1.41 | |
| 셀 제작 후, 2시간 이후에 주액 | 비교예 2 | 1.17 |
| 비교예 3 | 1.17 | |
| 비교예 4 | 1.40 | |
| 실시예 2 | 1.38 | |
| 실시예 3 | 1.41 |
| 전해액 주액 시점 | 구분 | 저항 (@SOC 50, ohm) |
| 셀 제작 후, 2시간 이후에 주액 | 비교예 3 | 0.83 |
| 비교예 4 | 1.05 | |
| 실시예 3 | 0.75 |
30: 금속 원자
30': 화학흡착된 금속 원자의 제1부분
30": 물리흡착되거나 표류하는 금속 원자의 제2부분
30a: 화학흡착된 금속 원자의 제1부분 전구체
40: 산화제
50: 금속산화물층
100: 음극
10', 110: 집전체
20', 120: 음극 합제층
130: 리튬 확산 속도 제어층
20,140: 리튬층
10,150: 박리판
Claims (15)
- 집전체;
상기 집전체 상에 형성된 음극 합제층
상기 음극 합제층 상에 원자층 증착법(Atomic Layer Deposition)에 의해 형성된 리튬 확산 속도 제어층 및
상기 리튬 확산 속도 제어층 상에 형성된 리튬층;
을 포함하는 리튬 이차 전지용 음극. - 제 1 항에 있어서, 상기 리튬 확산 속도 제어층은, 전해액의 주액 시까지 상기 리튬층의 리튬이 음극 합제층으로 확산되는 것을 제어하는 것을 특징으로 하는 리튬 이차 전지용 음극.
- 제 1 항에 있어서, 상기 리튬 확산 속도 제어층은, 최초 충방전 시까지 상기 리튬층의 리튬이 음극 합제층으로 확산되는 것을 제어하는 것을 특징으로 하는 리튬 이차 전지용 음극.
- 제 1 항에 있어서, 상기 리튬 확산 속도 제어층의 두께는 0.1~100nm인 것을 특징으로 하는 리튬 이차 전지용 음극.
- 제 1 항에 있어서, 상기 리튬 확산 속도 제어층의 두께는 0.5~50nm인 것을 특징으로 하는 리튬 이차 전지용 음극.
- 제 1 항에 있어서, 상기 음극 합제층은 SiOx (0< x ≤ 2), SnO 및 SnO2로 이루어진 군으로부터 선택된 1종의 화합물 또는 2종 이상의 혼합물을 포함하는 것을 특징으로 하는 리튬 이차 전지용 음극.
- 제 1 항에 있어서, 상기 리튬 확산 속도 제어층은 Al2O3, TiO2, ZrO2, HfO2, Ta2O5, Nb2O5, Y2O3, MbO, CeO2, SiO2, La2O3, Ln2O3, Lu2O3, PrAlO3, Er2O3, HfAlO, HfSiO, ZrSiO, ZrAlO, HfON, HfSiON, SrTiO3, BaTiO3, BST 및 Laminates로 이루어진 군으로부터 선택된 1종 또는 2종 이상을 포함하는 것을 특징으로 하는 리튬 이차 전지용 음극.
- 제 1 항에 있어서, 상기 리튬 확산 속도 제어층은 Al2O3인 것을 특징으로 하는 리튬 이차 전지용 음극.
- 제 1 항에 있어서, 상기 리튬 확산 속도 제어층 및 리튬층의 두께비는 1:100 내지 1:20000인 것을 특징으로 하는 리튬 이차 전지용 음극.
- (S11) 집전체 상에 음극 합제층을 형성하는 단계;
(S12) 박리판의 표면에 리튬 박막층을 형성하는 단계;
(S13) 상기 리튬 박막층 상에 금속산화물을 도입하는 원자층 증착 공정을 반복하여 리튬 확산 속도 제어층을 형성하는 단계;
(S14) 상기 음극 합제층과 상기 리튬 확산 속도 제어층이 대면하도록 상기 (S11)과 (S13)의 결과물을 적층시켜서 음극을 준비하는 단계;
(S15) 상기 (S14) 단계에서 준비된 음극을 포함하는 전극조립체를 제조하는 단계; 및
(S16) 상기 전극조립체에 전해액을 주액하는 단계;를 포함하는 리튬 이차 전지를 제조하는 방법. - (S21) 집전체 상에 음극 합제층을 형성하는 단계;
(S22) 상기 음극 합제층 상에 금속산화물을 도입하는 원자층 증착 공정을 반복하여 리튬 확산 속도 제어층을 형성하는 단계;
(S23) 상기 리튬 확산 속도 제어층 상에 리튬 박막을 적층하여 음극을 제조하는 단계;
(S24) 상기 (S23)단계에서 제조된 음극을 포함하는 전극조립체를 제조하는 단계; 및
(S25) 상기 전극조립체에 전해액을 주액하는 단계;를 포함하는 리튬 이차 전지를 제조하는 방법. - 제 10 항 또는 제 11 항 중 어느 하나의 항에 있어서, 상기 리튬 확산 속도 제어층의 두께가 0.1~100nm가 될 때까지 상기 원자층 증착 공정을 수행하는 것을 특징으로 하는 리튬 이차 전지를 제조하는 방법.
- 제 10 항 또는 제 11 항 중 어느 하나의 항에 있어서, 상기 리튬 확산 속도 제어층의 두께가 0.5~50nm가 될 때까지 상기 원자층 증착 공정을 수행하는 것을 특징으로 하는 리튬 이차 전지를 제조하는 방법.
- 제 10 항에 있어서, 상기 (S13) 단계는,
(S12)의 결과물을 챔버 내에 위치시키는 단계;
상기 챔버 내에 금속 원자를 공급하는 단계;
상기 챔버 내에 퍼지 가스를 공급하는 단계;
상기 챔버 내에 산화제를 공급하여, 금속산화물층을 형성하는 단계; 및
상기 챔버 내에 퍼지 가스를 공급하여 미반응 산화제를 제거하는 단계를 포함하는 것을 특징으로 하는 리튬 이차 전지를 제조하는 방법. - 제 11 항에 있어서, 상기 (S22) 단계는,
(S21)의 결과물을 챔버 내에 위치시키는 단계;
상기 챔버 내에 금속 원자를 공급하는 단계;
상기 챔버 내에 퍼지 가스를 공급하는 단계;
상기 챔버 내에 산화제를 공급하여, 금속산화물층을 형성하는 단계; 및
상기 챔버 내에 퍼지 가스를 공급하여 미반응 산화제를 제거하는 단계를 포함하는 것을 특징으로 하는 리튬 이차 전지를 제조하는 방법.
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| KR1020180132011A KR102459678B1 (ko) | 2018-10-31 | 2018-10-31 | 리튬 이차 전지용 음극, 이를 포함하는 리튬 이차 전지 및 이의 제조방법 |
| CN201980039436.2A CN112292771B (zh) | 2018-10-31 | 2019-09-26 | 用于锂二次电池的负极、包括所述负极的锂二次电池及其制造方法 |
| EP19878789.7A EP3796428B1 (en) | 2018-10-31 | 2019-09-26 | Negative electrode for lithium secondary battery, lithium secondary battery comprising same, and manufacturing method therefor |
| US17/255,670 US20210242457A1 (en) | 2018-10-31 | 2019-09-26 | Negative electrode for lithium secondary battery, lithium secondary battery comprising same, and manufacturing method therefor |
| PL19878789.7T PL3796428T3 (pl) | 2018-10-31 | 2019-09-26 | Elektroda ujemna dla akumulatora litowego, zawierający ją akumulator litowy i sposób jej wytwarzania |
| JP2021519520A JP7090807B2 (ja) | 2018-10-31 | 2019-09-26 | リチウム二次電池用負極、それを含むリチウム二次電池及びその製造方法 |
| PCT/KR2019/012542 WO2020091234A1 (ko) | 2018-10-31 | 2019-09-26 | 리튬 이차 전지용 음극, 이를 포함하는 리튬 이차 전지 및 이의 제조방법 |
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| KR20220011590A (ko) * | 2020-07-21 | 2022-01-28 | 주식회사 엘지에너지솔루션 | 리튬화 지연층이 도입된 리튬 이차전지용 음극 및 이의 제조방법 |
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| WO2022140967A1 (zh) * | 2020-12-28 | 2022-07-07 | 宁德新能源科技有限公司 | 负极极片、电化学装置和电子装置 |
| CN115548249A (zh) * | 2021-06-30 | 2022-12-30 | 比亚迪股份有限公司 | 负极材料、二次电池以及车辆 |
| KR20230095579A (ko) * | 2021-12-22 | 2023-06-29 | 주식회사 엘지에너지솔루션 | 리튬 이차 전지용 음극의 전리튬화 방법, 리튬 이차 전지용 음극 및 음극을 포함하는 리튬 이차 전지 |
| WO2023214860A1 (ko) * | 2022-05-06 | 2023-11-09 | 주식회사 엘지에너지솔루션 | 전극 전리튬화 방법, 전리튬화된 리튬 이차 전지용 전극 및 전극 전리튬화 장치 |
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2018
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- 2019-09-26 CN CN201980039436.2A patent/CN112292771B/zh active Active
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| JP2013143375A (ja) * | 2012-01-06 | 2013-07-22 | National Taiwan Univ Of Science & Technology | リチウムイオン電池のアノードプロテクタ及びその製造方法 |
| KR20180057513A (ko) | 2016-11-21 | 2018-05-30 | 주식회사 엘지화학 | 전극 및 이를 포함하는 리튬 이차 전지 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220011590A (ko) * | 2020-07-21 | 2022-01-28 | 주식회사 엘지에너지솔루션 | 리튬화 지연층이 도입된 리튬 이차전지용 음극 및 이의 제조방법 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7090807B2 (ja) | 2022-06-24 |
| JP2021527937A (ja) | 2021-10-14 |
| CN112292771B (zh) | 2024-06-14 |
| EP3796428A1 (en) | 2021-03-24 |
| WO2020091234A1 (ko) | 2020-05-07 |
| PL3796428T3 (pl) | 2022-08-22 |
| EP3796428B1 (en) | 2022-06-08 |
| US20210242457A1 (en) | 2021-08-05 |
| EP3796428A4 (en) | 2021-08-11 |
| KR102459678B1 (ko) | 2022-10-28 |
| CN112292771A (zh) | 2021-01-29 |
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