Long-Lasting Ni-Rich NCMA Cathodes via Simultaneous Microstructural Refinement and Surface Modification
- Authors
- Ryu, Hoon-Hee; Lim, Hyung-Woo; Kang, Gyeong-Cheol; Park, Nam-Yung; Sun, Yang-Kook
- Issue Date
- Mar-2023
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS ENERGY LETTERS, v.8, no.3, pp.1354 - 1361
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS ENERGY LETTERS
- Volume
- 8
- Number
- 3
- Start Page
- 1354
- End Page
- 1361
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185001
- DOI
- 10.1021/acsenergylett.3c00083
- ISSN
- 2380-8195
- Abstract
- Li[Ni1-x-y-zCoxMnyAlz]O2 (NCMA) cathodes have attracted public attention owing to their improved durability by leveraging the advantages of NCM and NCA cathodes. As the Ni content approaches 90%, however, it is challenging to realize high-energy Ni-rich NCMA cathodes without sacrificing durability. Herein, we improve the cycling stability of a Ni-rich Li[Ni0.93Co0.03Mn0.03Al0.01]O2 (NCMA93) cathode using a combination strategy involving microstructural refinement and surface modification. The F-coating-induced protective layer of the F coated, Sb-doped NCMA93 cathode combined with its engineered microstructure enables the formation of a robust cathode-electrolyte interphase (CEI) layer on the cathode surface, which suppresses surface degradation to afford a long battery life. However, the F coating alone does not significantly improve the cycling stability of cathode because it suffers severe microcracking during cycling owing to its suboptimal microstructure. To realize a cathode with a long lifespan, a robust CEI layer should be generated and maintained on the cathode without severe microcracking.
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