Atomic-scale constituting stable interface for improved LiNi0.6Mn0.2Co0.2O2 cathodes of lithium-ion batteries

Wang, Xin; Cai, Jiyu; Liu, Yongqiang; Han, Xiaoxiao; Ren, Yang; Li, Jianlin; Liu, Yuzi; Meng, Xiangbo

doi:10.1088/1361-6528/abd127

Title: Atomic-scale constituting stable interface for improved LiNi_0.6Mn_0.2Co_0.2O₂ cathodes of lithium-ion batteries

Journal Article · Wed Dec 23 00:00:00 EST 2020 · Nanotechnology

DOI:https://doi.org/10.1088/1361-6528/abd127· OSTI ID:1797784

Wang, Xin ^[1]; Cai, Jiyu ^[1]; Liu, Yongqiang ^[2]; Han, Xiaoxiao ^[1]; Ren, Yang ^[3];

^[4]; Liu, Yuzi ^[5];

^[1]

Univ. of Arkansas, Fayetteville, AR (United States)
Univ. of Arkansas, Fayetteville, AR (United States); Univ. of Science and Technology Beijing (China)
Argonne National Laboratory (ANL), Advanced Photon Source (APS)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Ascribed to their higher capacity and lower cost compared to conventional LiCoO₂, the Ni-rich layered LiNi_0.6Mn_0.2Co_0.2O₂ (NMC622) is now considered as one promising cathode for lithium-ion batteries (LIBs). However, it still suffers from some evident performance degradation, especially under high cutoff voltages (i.e., >4.3 V versus Li/Li⁺). The performance degradation typically is exhibited as capacity fading and voltage drop, mainly originating from an instable interface between the NMC622 and electrolyte as well as the evolution of the NMC structure. To improve the interfacial and structural stability of NMC cathodes, herein we deposited an ultrathin layer of Al₂O₃ coatings (<5 nm) conformally over NMC622 composite electrodes directly using atomic layer deposition (ALD). It was found that, under different upper cutoff voltages (4.3, 4.5, and 4.7 V), the ALD Al₂O₃ coatings enable enhanced performance of NMC622 cathodes with better cyclability and higher capacity. Particularly, the beneficial effects of the ALD Al₂O₃ coatings are more remarkable at higher upper cutoff voltages (4.5 and 4.7 V). Furthermore, the ALD coatings can significantly improve the rate capability of NMC622. To this end, we utilized a suite of characterization tools and performed a series of electrochemical tests to clarify the effects of the ALD Al₂O₃ coatings. This study revealed that the beneficial effects of the Al₂O₃ ALD coatings are multiple: (i) serving as an artificial layer of solid electrolyte interphase to mitigate undesirable interfacial reactions; (ii) acting as a physical barrier to inhibit metal dissolution of NMC; and (iii) forming a reinforced networked overcoating to boost the mechanical integrity of NMC cathodes. This study is favorable for designing high-performance NMC cathodes.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC02-06CH11357; OIA-1457888; AC05-00OR22725

OSTI ID:: 1797784

Alternate ID(s):: OSTI ID: 1760109

Journal Information:: Nanotechnology, Vol. 32, Issue 11; ISSN 0957-4484

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Atomic-scale constituting stable interface for improved LiNi0.6Mn0.2Co0.2O2 cathodes of lithium-ion batteries

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Title: Atomic-scale constituting stable interface for improved LiNi_0.6Mn_0.2Co_0.2O₂ cathodes of lithium-ion batteries