Elucidating and Mitigating High-Voltage Interfacial Chemomechanical Degradation of Nickel-Rich Lithium-Ion Battery Cathodes via Conformal Graphene Coating
SCIE
SCOPUS
- Title
- Elucidating and Mitigating High-Voltage Interfacial Chemomechanical Degradation of Nickel-Rich Lithium-Ion Battery Cathodes via Conformal Graphene Coating
- Authors
- Luu, Norman S.; Lim, Jin-Myoung; Torres-Castanedo, Carlos G.; Park, Kyu-Young; Moazzen, Elahe; He, Kun; Meza, Patricia E.; Li, Wenyun; Downing, Julia R.; Hu, Xiaobing; Dravid, Vinayak P.; Barnett, Scott A.; Bedzyk, Michael J.; Hersam, Mark C.
- Date Issued
- 2021-09-28
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Lithium nickel manganese cobalt oxides (NMCs) are promising cathode materials for high-performance lithium-ion batteries. Although these materials are commonly cycled within mild voltage windows (up to 4.3 V vs Li/Li+), operation at high voltages (>4.7 V vs Li/Li+) to access additional capacity is generally avoided due to severe interfacial and chemomechanical degradation. At these high potentials, NMC degradation is caused by exacerbated electrolyte decomposition reactions and non-uniform buildup of chemomechanical strains that result in particle fracture. By applying a conformal graphene coating on the surface of NMC primary particles, we find significant enhancements in the high-voltage cycle life and Coulombic efficiency upon electrochemical cycling. Postmortem X-ray diffraction, X-ray photoelectron spectroscopy, and electron microscopy suggest that the graphene coating mitigates electrolyte decomposition reactions and reduces particle fracture and electrochemical creep. We propose a relationship between the spatial uniformity of lithium flux and particle-level mechanical degradation and show that a conformal graphene coating is well-suited to address these issues. Overall, these results delineate a pathway for rationally mitigating high-voltage chemomechanical degradation of nickel-rich cathodes that can be applied to existing and emerging classes of battery materials. ©
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/107714
- DOI
- 10.1021/acsaem.1c01995
- ISSN
- 2574-0962
- Article Type
- Article
- Citation
- Acs Applied Energy Materials, vol. 4, no. 10, page. 11069 - 11079, 2021-09-28
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.