JP2023501681A - リチウム二次電池用正極活物質、前記正極活物質の製造方法 - Google Patents
リチウム二次電池用正極活物質、前記正極活物質の製造方法 Download PDFInfo
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- JP2023501681A JP2023501681A JP2022528132A JP2022528132A JP2023501681A JP 2023501681 A JP2023501681 A JP 2023501681A JP 2022528132 A JP2022528132 A JP 2022528132A JP 2022528132 A JP2022528132 A JP 2022528132A JP 2023501681 A JP2023501681 A JP 2023501681A
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- active material
- positive electrode
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- lithium
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 239000002296 pyrolytic carbon Substances 0.000 description 1
- 239000001008 quinone-imine dye Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000002153 silicon-carbon composite material Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical class O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000002733 tin-carbon composite material Substances 0.000 description 1
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 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
[化学式1]
Li1+aNixCoyM1 zBwO2
前記化学式1中、M1は、MnまたはAlのうち少なくともいずれか一つを含み、0≦a≦0.5、0.5≦x<1.0、0<y≦0.4、0<z≦0.4、0<w≦0.1である。
本発明者らは、リチウム遷移金属酸化物の一次粒子のサイズおよび結晶粒のサイズを特定の範囲で制御することで、正極活物質の高温寿命特性、高温貯蔵特性およびガス発生特性を改善することができることを見出し、本発明を完成するに至った。
Li1+aNixCoyM1 zBwO2
次に、本発明による正極活物質の製造方法について説明する。
Nix1Coy1M1 z1(OH)2
また、本発明は、上述の正極活物質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ることができ、より具体的には、リチウム二次電池であることができる。
Ni0.6Co0.2Mn0.2(OH)2で表される前駆体、LiOH・H2OおよびH3BO3を、遷移金属(Me):Li:Bのモル比が0.97:1.02:0.03になるように混合し、780℃で23時間熱処理を行って、Bドープされた正極活物質を製造した。
790℃で熱処理する以外は、前記実施例1と同じ方法で正極活物質を製造した。
750℃で熱処理する以外は、前記実施例1と同じ方法で正極活物質を製造した。
850℃で熱処理する以外は、前記実施例1と同じ方法で正極活物質を製造した。
Ni0.6Co0.2Mn0.2(OH)2で表される前駆体およびLiOH・H2Oを、遷移金属(Me):Liのモル比が1:1.02になるように混合し、740℃で23時間熱処理を行って、正極活物質を製造した。
Ni0.6Co0.2Mn0.2(OH)2で表される前駆体およびLiOH・H2Oを、遷移金属(Me):Liのモル比が1:1.02になるように混合し、850℃で23時間熱処理を行って、正極活物質を製造した。
Ni0.6Co0.2Mn0.2(OH)2で表される前駆体、LiOH・H2OおよびH3BO3を、遷移金属(Me):Li:Bのモル比が0.92:1.02:0.08になるように混合し、780℃で23時間熱処理を行って、Bドープされた正極活物質を製造した。
(1)正極活物質の一次粒子の平均粒径
前記実施例1~2および比較例1~5で製造した正極活物質の一次粒子の平均粒径を測定した。
前記実施例1~2および比較例1~2で製造した正極活物質の一次粒子の結晶粒のサイズを測定した。
実施例1~2および比較例1~5で製造した正極活物質を用いて、二次電池を製造し、前記実施例1~2および比較例1~5の正極活物質を含む二次電池それぞれに対して、高温特性を評価した。
前記実験例2により製造した実施例1~2および比較例1~5の二次電池の高温での貯蔵特性を測定した。
Claims (13)
- 一次粒子が凝集して形成された二次粒子の形態を有し、下記化学式1で表されるリチウム遷移金属酸化物を含む正極活物質であって、
前記リチウム遷移金属酸化物は、結晶粒のサイズが160nm以下であり、一次粒子の平均粒径が0.6μm以上であり、
[化学式1]
Li1+aNixCoyM1 zBwO2
前記化学式1中、
M1は、MnまたはAlのうち少なくともいずれか一つを含み、
0≦a≦0.5、0.5≦x<1.0、0<y≦0.4、0<z≦0.4、0<w≦0.1である、正極活物質。 - 前記リチウム遷移金属酸化物100重量部に対して、ホウ素(B)は、0.02~0.3重量部で含まれる、請求項1に記載の正極活物質。
- 前記リチウム遷移金属酸化物の結晶粒のサイズは、100nm~160nmである、請求項1または2に記載の正極活物質。
- 前記リチウム遷移金属酸化物の一次粒子は、0.6μm~1.3μmの平均粒径を有する、請求項1から3のいずれか一項に記載の正極活物質。
- 前記正極活物質は、二次粒子の平均粒径D50が相違する2種のリチウム遷移金属酸化物を含む、請求項1から4のいずれか一項に記載の正極活物質。
- 前記正極活物質は、二次粒子の平均粒径D50が7μm~20μmである大粒径リチウム遷移金属酸化物と、二次粒子の平均粒径D50が1μm~7μmである小粒径リチウム遷移金属酸化物とを含む、請求項5に記載の正極活物質。
- 遷移金属水酸化物前駆体を準備するステップと、
遷移金属水酸化物前駆体、リチウム原料物質およびホウ素(B)含有原料物質を混合し、760℃~840℃で焼成して、ホウ素(B)ドープされたリチウム遷移金属酸化物を製造するステップとを含み、
前記ホウ素(B)ドープされたリチウム遷移金属酸化物は、下記化学式1で表され、結晶粒のサイズが160nm以下であり、一次粒子の平均粒径が0.6μm以上であり、
[化学式1]
Li1+aNixCoyM1 zBwO2
前記化学式1中、
M1は、MnまたはAlのうち少なくともいずれか一つを含み、
0≦a≦0.5、0.5≦x<1.0、0<y≦0.4、0<z≦0.4、0<w≦0.1である、正極活物質の製造方法。 - 前記遷移金属水酸化物前駆体は、下記化学式2で表され、
[化学式2]
Nix1Coy1M1 z1(OH)2
前記化学式2中、
M1は、MnまたはAlのうち少なくともいずれか一つを含み、
0.5≦x1<1.0、0<y1≦0.4、0<z1≦0.4、x1+y1+z1=1である、請求項7に記載の正極活物質の製造方法。 - 前記遷移金属水酸化物前駆体と前記ホウ素(B)含有原料物質は、遷移金属の総モル数:ホウ素のモル数が0.97:0.03~0.998:0.002になるようにする量で混合される、請求項7または8に記載の正極活物質の製造方法。
- 前記リチウム原料物質は、遷移金属とホウ素の総モル数に対するリチウムのモル数比が1.0~1.2になるようにする量で混合される、請求項7から9のいずれか一項に記載の正極活物質の製造方法。
- 前記焼成は、760℃~800℃で15時間~30時間行われる、請求項7から10のいずれか一項に記載の正極活物質の製造方法。
- 請求項1から6のいずれか一項に記載の正極活物質を含む、リチウム二次電池用正極。
- 請求項12に記載のリチウム二次電池用正極を含む、リチウム二次電池。
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- 2020-12-04 US US17/778,475 patent/US20220416238A1/en active Pending
- 2020-12-04 EP EP20895599.7A patent/EP4047693A4/en active Pending
- 2020-12-04 WO PCT/KR2020/017599 patent/WO2021112606A1/ko unknown
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WO2016006557A1 (ja) * | 2014-07-07 | 2016-01-14 | 日立金属株式会社 | リチウムイオン二次電池用正極材、それを用いたリチウムイオン二次電池用正極及びリチウムイオン二次電池、並びにリチウムイオン二次電池用正極材の製造方法 |
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KR20190086403A (ko) * | 2018-01-12 | 2019-07-22 | 한양대학교 산학협력단 | 양극활물질, 그 제조 방법, 및 이를 포함하는 리튬 이차 전지 |
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EP4047693A4 (en) | 2022-12-21 |
CN114730872A (zh) | 2022-07-08 |
US20220416238A1 (en) | 2022-12-29 |
EP4047693A1 (en) | 2022-08-24 |
WO2021112606A1 (ko) | 2021-06-10 |
KR20210070933A (ko) | 2021-06-15 |
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