[논문]층상계 하이니켈 양극재의 잔류 리튬 생성 및 저감 메커니즘 연구

빈민욱; 나범탁; 홍태은; 김영진

doi:10.22805/jit.2022.42.1.007

층상계 하이니켈 양극재의 잔류 리튬 생성 및 저감 메커니즘 연구
A Mechanism Study on Formation and Reduction of Residual Li of High Nickel Cathode for Lithium-ion Batteries 원문보기

産業技術硏究 : 江原大學校産業技術硏究所 = Journal of industrial technology, v.42 no.1, 2022년, pp.7 - 12

빈민욱 (Research Institute of Advanced Manufacturing Materials Technology, Korea Institute of Industrial Technology) , 나범탁 (Research Institute of Advanced Manufacturing Materials Technology, Korea Institute of Industrial Technology) , 홍태은 (Busan Center, Korea Basic Science Institute) , 김영진 (Department of Materials Science and Engineering, Kangwon National University)

Abstract ▼ AI-Helper

High nickel layered oxide cathodes are gaining increasing attention for lithium-ion batteries due to their higher energy density and lower cost compared to LiCoO2. However, they suffer from the formation of residual lithium on the surface in the form of LiOH and Li2CO3 on exposure to ambient air. The residual lithium causes notorious issues, such as slurry gelation during electrode preparation and gas evolution during cell cycling. In this review, we investigate the residual lithium issues through its impact on cathode slurry instability based on deformed polyvinylidene fluoride (PVdF) as well as its formation and reduction mechanism in terms of inherently off-stoichiometric synthesis of high nickel cathodes. Additionally, new analysis method with anhydrous methanol was introduced to exclude Li+/H+ exchange effect during sample preparation with distilled water. We hope that this review would contribute to encouraging the academic efforts to consider practical aspects and mitigation in global high-energy-density lithium-ion battery manufacturers.

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그림 Fig. 1 (a) A proposed degradation mechanism of PVdF by dehydrofluorination in an alkali solution. Reproduced with permission from ref. 10. Copyright 2020 American Chemical Society (b) A cathode slurry gelation due to high residual lithium content. Reproduced with permission from ref. 11. Copyright 2016 Wiley-VCHEnglish
그림 Fig. 2 (a) Formation of residual lithium compound and their reconstruction strategy via coating in high nickel cathodes, (b) various coating strategies on cathodes: (i) uncoated; (ii) typical coating; and (iii) interdiffusion based coating, Li/Ni mixing in high nickel cathodes (c) before and (d) after interdiffusion based coating, and (e) super-exchange interaction of Ni²⁺-O₂--M: (i) 180° (M: Ni³⁺ and Fe³⁺) and (ii) 90° (M: Co³⁺) super-exchange. Reproduced with permission from ref. 9. Copyright 2021 Wiley-VCH
그림 Fig. 3 Illustration of the Li-leaching mechanism of high nickel cathodes during analyte preparation: (a) Residual lithium compounds (LiOH and Li₂CO₃) can be observed on the surface of LiNi_0.91Mn_0.03Co_0.06O₂ (NMC91), (b) Water for analyte preparation can lead to dissolve residual Li and additional Li+/H+ exchange from NMC91. (c) Co-rich LiNi_xCo_1-xO₂ (yellow) and lower nickel content LiNi_xCo_1-xO₂ (green) were formed on the surface of cobalt hydroxide coated NMC91 (Co-NMC91) after dry cobalt precursor coating on NMC91, and (d) additional Li⁺/H⁺ exchange from NMC91 effectively suppressed with cobalt-rich surface coating layer on the Co-NMC91 in water during analyte preparation. Reproduced with permission from ref. 7. Copyright 2021 American Chemical Society

참고문헌 (17)

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층상계 하이니켈 양극재의 잔류 리튬 생성 및 저감 메커니즘 연구
A Mechanism Study on Formation and Reduction of Residual Li of High Nickel Cathode for Lithium-ion Batteries 원문보기

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층상계 하이니켈 양극재의 잔류 리튬 생성 및 저감 메커니즘 연구 A Mechanism Study on Formation and Reduction of Residual Li of High Nickel Cathode for Lithium-ion Batteries 원문보기

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층상계 하이니켈 양극재의 잔류 리튬 생성 및 저감 메커니즘 연구
A Mechanism Study on Formation and Reduction of Residual Li of High Nickel Cathode for Lithium-ion Batteries 원문보기