JP2024533464A - 分離膜を含むリチウム二次電池 - Google Patents
分離膜を含むリチウム二次電池 Download PDFInfo
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Abstract
Description
(T1-T2)/T1×100
前記式1において、
T1は、前記分離膜が3枚積層された状態の初期の厚さを意味し、
T2は、前記分離膜を3枚積層した後、ホットプレス(Q-mesys社製QM-940A Grade)で2000kgf、70℃で10秒プレスした後の厚さを意味し、
前記絶縁破壊電圧は、前記分離膜を含むモノセルをChroma社のHipot tester(AC/DC/IR Tester)で0Vから6000Vまで100V/sの速度で昇圧していき、絶縁破壊する時点の電圧を意味する。
(T1-T2)/T1×100
前記式1において、
T1は、前記分離膜が3枚積層された状態の初期厚さを意味し、
T2は、前記分離膜を3枚積層した後、ホットプレス(Q-mesys社製QM-940A Grade)で2000kgf、70℃で10秒プレスした後の厚さを意味し、
前記絶縁破壊電圧は、前記分離膜を含むモノセルをChroma社のHipot tester(AC/DC/IR Tester)で0Vから6000Vまで100V/sの速度で昇圧していき、絶縁破壊する時点の電圧を意味する。
4πA/P2
(T1-T2)/T1×100
前記式1において、
T1は、前記分離膜が3枚積層された状態の初期厚さを意味し、
T2は、前記分離膜を3枚積層した後、ホットプレス(Q-mesys社製QM-940A Grade)で2000kgf、70℃で10秒プレスした後の厚さを意味する。
<負極の製造>
無機Si(Wacker社)とポリアクリルアミド(polyacrylamide、Aldrich社)および導電材(Super-C、Immerys社)を7:2:1の割合でDI水(DI Water)に34wt%濃度で混合してSiスラリーを製造した。
NCMA正極材(LG化学社HN803 Grade)とPVdFバインダー(Arkema社 KF9709)を97.74:2.26の割合でNMP溶媒に混合して固形分濃度75.5%の正極スラリーを製造した。
前記表1の分離膜3枚を積層した後の厚さ(T1)を測定し、ホットプレス(Q-MESYS社QM-940A Grade)で2000kgf、70℃、10秒間プレスした後の厚さ(T2)を測定し、前述の式1に従って計算した。
前記表1の絶縁破壊電圧は、前記分離膜を含む実施例1~実施例4、比較例1および比較例2のモノセルをChroma社のHipot tester(AC/DC/IR Tester)で0Vから6000Vまで100V/sの速度で昇圧しながら絶縁破壊する時点の電圧を測定した。
20 ・・・負極活物質層
30 ・・・分離膜
40 ・・・正極活物質層
50 ・・・正極集電体層
100 ・・・リチウム二次電池用負極
200 ・・・リチウム二次電池用正極
Claims (10)
- シリコン系負極;正極;前記負極と前記正極との間に位置する分離膜;および電解質;を含むリチウム二次電池であって、
前記シリコン系負極は、負極集電体層;および前記負極集電体層の一面または両面に設けられた負極活物質層組成物を含む負極活物質層;を含み、
前記負極活物質層組成物は、シリコン系活物質;負極導電材;および負極バインダーからなる群から選択される少なくとも1つを含み、
前記シリコン系活物質は、SiOx(x=0)およびSiOx(0<x<2)からなる群から選択される少なくとも1つを含み、前記シリコン系活物質100重量部基準で、前記SiOx(x=0)を70重量部以上含み、
前記分離膜は、1μm以上15μm以下の厚さを満たし、下記式1で定義される耐圧縮性が1%以上14.5%以下であり、絶縁破壊電圧が400V以上である、リチウム二次電池:
[式1]
(T1-T2)/T1×100
前記式1において、
T1は、前記分離膜が3枚積層された状態の初期厚さを意味し、
T2は、前記分離膜を3枚積層した後、ホットプレス(Q-mesys社製QM-940A Grade)で2000kgf、70℃で10秒プレスした後の厚さを意味し、
前記絶縁破壊電圧は、前記分離膜を含むモノセルをChroma社のHipot tester(AC/DC/IR Tester)で0Vから6000Vまで100V/sの速度で昇圧していき、絶縁破壊する時点の電圧を意味する。 - 前記分離膜は、湿式分離膜または乾式分離膜である、請求項1に記載のリチウム二次電池。
- 前記分離膜は、多孔性高分子フィルム;多孔性不織布;およびセラミック成分からなる群から選択される少なくとも1つを含む、請求項1に記載のリチウム二次電池。
- 前記分離膜は、単層または2以上の層を含む、請求項1に記載のリチウム二次電池。
- 前記分離膜の気孔サイズは、10nm以上100nm以下である、請求項1に記載のリチウム二次電池。
- 前記負極活物質層組成物100重量部基準に前記シリコン系活物質は、60重量部以上含まれる、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。
- 前記負極導電材は、点状導電材;線状導電材;および面状導電材からなる群から選択される少なくとも1つを含む、請求項1に記載のリチウム二次電池。
- 前記負極活物質層の前記分離膜と接する面の表面粗さ(Ra)は、3μm以上10μm以下である、請求項1に記載のリチウム二次電池。
- 前記負極活物質層の厚さは、10μm以上100μm以下である、請求項1に記載のリチウム二次電池。
- 前記正極は、LiNixCoyMnzO2(x+y+z=1);LiNiaCobMncAldO2(a+b+c+d=1);LiMn2O4;LiNi0.5Mn1.5O2;およびLiMxFeyPO4(M:遷移金属、x+y=1)からなる群から選択される少なくとも1つを含む、請求項1に記載のリチウム二次電池。
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PCT/KR2023/001113 WO2023146258A1 (ko) | 2022-01-28 | 2023-01-25 | 분리막을 포함하는 리튬 이차 전지 |
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JP5252386B2 (ja) | 2007-09-25 | 2013-07-31 | 学校法人東京理科大学 | リチウムイオン電池用負極 |
KR101958835B1 (ko) * | 2016-10-26 | 2019-07-02 | 제일모직 주식회사 | 분리막, 이의 제조방법 및 이를 이용한 전지 |
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