KR20180027143A - 고밀도의 양극재를 통해 고용량을 구현한 이차전지용 양극 및 이를 제조하는 방법 - Google Patents
고밀도의 양극재를 통해 고용량을 구현한 이차전지용 양극 및 이를 제조하는 방법 Download PDFInfo
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- KR20180027143A KR20180027143A KR1020160114353A KR20160114353A KR20180027143A KR 20180027143 A KR20180027143 A KR 20180027143A KR 1020160114353 A KR1020160114353 A KR 1020160114353A KR 20160114353 A KR20160114353 A KR 20160114353A KR 20180027143 A KR20180027143 A KR 20180027143A
- Authority
- KR
- South Korea
- Prior art keywords
- positive electrode
- cathode material
- cathode
- mixture
- transition metal
- Prior art date
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Abstract
R1 / R2 = Rm > 10 [수식 1]
W1 / W2 = Wm > 5 [수식 2]
상기 식에서, R1은 제 1 양극재의 평균 입경(D50)이고; R2는 제 2 양극재의 평균 입경(D50)이며; W1은 양극 활물질의 총 중량 대비 제 1 양극재의 중량%이고; W2는 양극 활물질의 총 중량 대비 제 2 양극재의 중량%이다.
Description
Claims (18)
- 양극 활물질, 도전재 및 바인더를 포함하는 양극 합제가 집전체 상에 도포되어 있는 양극으로서,
상기 양극 활물질은,
하기 수식 1과 수식 2를 만족하는 제 1 양극재 및 제 2 양극재의 혼합물이 도전재 및 바인더와 함께 4.2 g/cm3 이상의 전극 밀도를 가지는 바이모달(bimodal) 형태로 양극 합제에 함유되어 있는 것을 특징으로 하는 양극:
R1 / R2 = Rm > 10 [수식 1]
W1 / W2 = Wm > 5 [수식 2]
상기 식에서,
R1은 제 1 양극재의 평균 입경(D50)이고;
R2는 제 2 양극재의 평균 입경(D50)이며;
W1은 양극 활물질의 총 중량 대비 제 1 양극재의 중량%이고;
W2는 양극 활물질의 총 중량 대비 제 2 양극재의 중량%이다. - 제 1 항에 있어서, 상기 제 1 양극재 및 제 2 양극재는 각각 리튬 코발트 산화물인 것을 특징으로 하는 양극.
- 제 2 항에 있어서, 상기 제 1 양극재 및 제 2 양극재는 서로 독립적으로 하기 화학식 1로 표현되는 리튬 코발트 전이금속 복합 산화물인 것을 특징으로 하는 양극.
LiaCo(1-x-y)MxMeyO2-hAh (1)
상기 식에서, M 및 Me은 서로 독립적으로 Ti, Mg, Al, Zr, Ba, Ca, Nb, Ta 및 Mo으로 이루어진 군으로부터 선택되는 적어도 1종 이상이고, A는 산소 치환형 할로겐이며, 0.95≤a≤1.05, 0≤x≤0.2, 0≤y≤0.2, 0≤x+y≤0.2, 0≤h≤0.001이다. - 제 3 항에 있어서, 상기 제 1 양극재와 제 2 양극재는 조성이 서로 동일한 리튬 코발트 전이금속 복합 산화물인 것을 특징으로 하는 양극.
- 제 4 항에 있어서, 상기 리튬 코발트 전이금속 복합 산화물은, M으로서 Mg를 포함하고, Me으로서 Ti를 포함하는 것을 특징으로 하는 양극.
- 제 3 항에 있어서, 상기 제 1 양극재와 제 2 양극재는 조성이 서로 상이한 리튬 코발트 전이금속 복합 산화물인 것을 특징으로 하는 양극.
- 제 6 항에 있어서, 상기 제 1 양극재는, M으로서 Mg와 Me으로서 Ti를 각각 포함하고, 상기 제 2 양극재는 M으로서 Al을 포함하는 것을 특징으로 하는 양극.
- 제 1 항에 있어서,
상기 제 1 양극재는 R1이 16 마이크로미터 내지 20 마이크로미터인 입자로 구성되어 있고;
상기 제 2 양극재는 R2가 1 마이크로미터 내지 2 마이크로미터인 입자로 구성되어 있는 것을 특징으로 하는 양극. - 제 1 항에 있어서,
상기 도전재는 양극 합제의 총량 대비 0 중량% 초과 내지 3 중량% 이하로 양극 합제에 포함되어 있고;
상기 바인더는 양극 합제의 총량 대비 0 중량% 초과 내지 3 중량% 이하로 양극 합제에 포함되어 있는 것을 특징으로 하는 양극. - 제 1 항에 있어서, 상기 W1은 85 중량% 내지 95 중량%이고, 상기 W2는 5 중량% 내지 15 중량%이며, 상기 Wm은 19 이하인 것을 특징으로 하는 양극.
- 제 1 항에 있어서, 상기 Rm은 20 이하인 것을 특징으로 하는 양극.
- 제 1 항에 있어서, 상기 Rm은 Wm 보다 큰 것을 특징으로 하는 양극.
- 제 1 항에 있어서, 상기 제 1 양극재 및 제 2 양극재의 혼합물이 4.3 g/cm3의 전극 밀도를 가지는 것을 특징으로 하는 양극.
- 제 1 항 내지 제 13 항 중 어느 하나에 따른 양극을 제조하는 방법으로서,
(a) 제 1 전이금속 전구체와 리튬 코발트 전구체를 혼합한 후, 제 1 온도로 소성하여 제 1 양극재를 제조하는 과정;
(b) 제 2 전이금속 전구체와 리튬 코발트 전구체를 혼합한 후, 제 1 온도 대비 상대적으로 저온의 제 2 온도로 소성하여 제 2 양극재를 제조하는 과정;
(c) 상기 Rm이 10 내지 20이고, Wm이 5 내지 19가 만족되도록 제 1 양극재와 제 2 양극재가 혼합된 양극 활물질과 도전재, 및 바인더를 조합하여 양극 합제를 제조하는 과정; 및
(d) 상기 양극 합제를 전극 집전체에 도포한 후, 도포된 양극 합제 층을 건조 및 압연하는 과정;을 포함하는 것을 특징으로 하는 방법. - 제 14 항에 있어서, 상기 제 1 온도는 1000도 내지 1100도이고, 상기 제 2 온도는 제 1 온도 대비 80% 내지 99%의 온도인 것을 특징으로 하는 방법.
- 제 14 항에 있어서, 상기 리튬 코발트 전구체는 Li2CO3인 것을 특징으로 하는 방법.
- 제 14 항에 있어서, 상기 제 1 전이금속 전구체 및 제 2 전이금속 전구체는 각각, MgO, TiO2, ZrO, Al2O3 및 Nb2O5 에서 선택되는 적어도 하나의 금속 산화물인 것을 특징으로 하는 방법.
- 제 1 항 내지 제 13 항 중 어느 하나에 따른 양극과 분리막 및 음극을 포함하는 이차전지.
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