JP2023514346A - リチウム二次電池用正極材、これを含む正極及びリチウム二次電池 - Google Patents
リチウム二次電池用正極材、これを含む正極及びリチウム二次電池 Download PDFInfo
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- JP2023514346A JP2023514346A JP2022549517A JP2022549517A JP2023514346A JP 2023514346 A JP2023514346 A JP 2023514346A JP 2022549517 A JP2022549517 A JP 2022549517A JP 2022549517 A JP2022549517 A JP 2022549517A JP 2023514346 A JP2023514346 A JP 2023514346A
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- positive electrode
- active material
- electrode active
- cathode
- transition metal
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- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
式(1):0<{(B-A)/B}×100≦10
本発明者達は、平均粒径が異なる2種の正極活物質を混合して用い、ただし、相対的に平均粒径が大きい大粒径の第1正極活物質と、相対的に平均粒径が小さい小粒径の第2正極活物質との粒子強度の差を最適化することにより、高い体積エネルギー密度を有しながらも粒子割れ(crack)を抑制することができ、これにより、電池への適用時に高温寿命特性を改善することができることを見出し、本発明を完成した。
式(1):0<{(B-A)/B}×100≦10
[化学式1]
Li1+aNixCoyM1 zM2 wO2
[化学式2]
Li1+aNixCoyMnz1Alz2M2 wO2
式(1):0<{(B-A)/B}×100≦10
また、本発明は、前述した方法により製造された正極材を含むリチウム二次電池用正極を提供する。
また、本発明は、前記正極を含む電気化学素子を製造することができる。前記電気化学素子は、具体的には電池、キャパシタなどであってよく、より具体的にはリチウム二次電池であってよい。
以下の方法通りに製造した第1正極活物質と第2正極活物質を8:2の重量比で混合し、これを正極材として用いた。
NiSO4、CoSO4、MnSO4をニッケル:コバルト:マンガンのモル比が88:5:7となるようにする量で水に溶解して2M濃度の遷移金属含有溶液を準備した。
NiSO4、CoSO4、MnSO4をニッケル:コバルト:マンガンのモル比が83:5:12となるようにする量で水に溶解して2M濃度の遷移金属含有溶液を用い、前駆体の製造時に濃縮過程を2~3回のみ繰り返すことにより、平均粒径(D50)が約5μmとなるまで粒子を成長させた点を除いては、前記第1正極活物質前駆体の製造方法と同一の方法で第2正極活物質前駆体を製造した。
第1正極活物質の製造時の焼成温度を760℃、第2正極活物質の製造時の焼成温度を765℃とした点を除いては、実施例1と同一の方法で正極材を製造した。
第1正極活物質の製造時の焼成温度を760℃、第2正極活物質の製造時の焼成温度を770℃とした点を除いては、実施例1と同一の方法で正極材を製造した。
第1正極活物質前駆体として、Zoomwe社で市販される平均粒径(D50)が約15μmのNi0.88Co0.05Mn0.07(OH)2を用いた点を除いては、実施例1と同一の方法で正極材を製造した。
第1正極活物質前駆体として、Zoomwe社で市販される平均粒径(D50)が約15μmのNi0.88Co0.05Mn0.07(OH)2を用い、第2正極活物質の製造時の焼成温度を765℃とした点を除いては、実施例1と同一の方法で正極材を製造した。
(1)平均粒径(D50)
前記実施例1~2及び比較例1~3で製造した正極活物質それぞれの平均粒径(D50)を測定した。
前記実施例1~2及び比較例1~3で製造した正極活物質粒子のサンプルを採取し、採取されたサンプルに圧力をかけながら粒子にクラックが発生する時点を測定し、圧力単位(MPa)に換算して粒子強度を測定した。測定の結果は、下記表1に示した。
実施例1及び比較例1でそれぞれ製造した正極材と導電材(FX35)とバインダー(KF9700とBM730Hを1.35:0.15重量比で混合)を97.5:1:1.5の重量比でN‐メチル‐2‐ピロリドン(NMP)溶媒中で混合して正極スラリーを製造した。前記正極スラリーをアルミニウム集電体の一面に塗布した後、130℃で乾燥し、空隙率(porosity)が24%となるように圧延して正極を製造した。
実施例1~2及び比較例1~3でそれぞれ製造した正極材と導電材(FX35)とバインダー(KF9700とBM730Hを1.35:0.15の重量比で混合)を97.5:1:1.5の重量比でN‐メチル‐2‐ピロリドン(NMP)溶媒中で混合して正極スラリーを製造した。前記正極スラリーをアルミニウム集電体の一面に塗布した後、130℃で乾燥し、空隙率(porosity)が24%となるように圧延して正極を製造した。
Claims (12)
- 平均粒径(D50)が異なる第1正極活物質及び第2正極活物質を含む正極材であり、
前記第1正極活物質と前記第2正極活物質は、それぞれ独立して、遷移金属中のニッケルのモル比が80モル%以上であるリチウム遷移金属酸化物であり、
前記第1正極活物質の平均粒径(D50)が前記第2正極活物質の平均粒径(D50)より大きく、
下記式(1)を満たし、
式(1):0<{(B-A)/B}×100≦10
前記式(1)中、前記Aは、前記第1正極活物質の粒子強度値であり、前記Bは、前記第2正極活物質の粒子強度値である、正極材。 - 前記第1正極活物質と前記第2正極活物質は、それぞれ独立して、下記[化学式1]で表されるリチウム遷移金属酸化物であり、
[化学式1]
Li1+aNixCoyM1 zM2 wO2
前記化学式1中、
0≦a≦0.3、0.8≦x<1.0、0<y<0.2、0<z<0.2、0≦w≦0.1であり、
M1は、Mn及びAlよりなる群から選択される1種以上であり、
M2は、W、Mo、Cr、Zr、Ti、Mg、Ta及びNbよりなる群から選択される1種以上である、請求項1に記載の正極材。 - 前記第1正極活物質と前記第2正極活物質は、それぞれ独立して、下記[化学式2]で表されるリチウム遷移金属酸化物であり、
[化学式2]
Li1+aNixCoyMnz1Alz2M2 wO2
前記化学式2中、
0≦a≦0.3、0.8≦x<1.0、0<y<0.2、0<z1<0.2、0<z2<0.2、0≦w≦0.1であり、
M2は、W、Mo、Cr、Zr、Ti、Mg、Ta及びNbよりなる群から選択される1種以上である、請求項1に記載の正極材。 - 前記第1正極活物質の全遷移金属中のニッケルのモル比が85モル%以上であるリチウム遷移金属酸化物であり、
前記第2正極活物質の全遷移金属中のニッケルのモル比が80モル%から85モル%であるリチウム遷移金属酸化物である、請求項1に記載の正極材。 - 前記第1正極活物質の粒子強度Aが50MPaから500MPaである、請求項1に記載の正極材。
- 前記第2正極活物質の粒子強度Bが50MPaから500MPaである、請求項1に記載の正極材。
- 前記正極材は、バイモーダル粒度分布を有する、請求項1に記載の正極材。
- 前記第1正極活物質の平均粒径(D50)は、8μm超50μm以下である、請求項1に記載の正極材。
- 前記第2正極活物質の平均粒径(D50)は、0.1μmから8μmである、請求項1に記載の正極材。
- 前記第1正極活物質と前記第2正極活物質は、50:50から99:1の重量比で含まれる、請求項1に記載の正極材。
- 請求項1に記載の正極材を含む正極。
- 請求項11に記載の正極を含むリチウム二次電池。
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WO2019103460A1 (ko) * | 2017-11-21 | 2019-05-31 | 주식회사 엘지화학 | 이차전지용 양극재 및 이를 포함하는 리튬 이차전지 |
WO2019151834A1 (ko) * | 2018-02-01 | 2019-08-08 | 주식회사 엘지화학 | 이차전지용 양극 활물질, 그 제조방법 및 이를 포함하는 리튬 이차전지 |
WO2019163483A1 (ja) * | 2018-02-22 | 2019-08-29 | 三洋電機株式会社 | 非水電解質二次電池 |
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KR20210117212A (ko) | 2021-09-28 |
CN115053368B (zh) | 2023-12-19 |
WO2021187907A1 (ko) | 2021-09-23 |
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US20230073433A1 (en) | 2023-03-09 |
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