Premium
Optimized Ni‐Rich NCMA Cathode for Electric Vehicle Batteries
Author(s) -
Park NamYung,
Ryu HoonHee,
Park GeonTae,
Noh TaeChong,
Sun YangKook
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202003767
Subject(s) - cathode , materials science , electrochemistry , microstructure , electrolyte , transmission electron microscopy , particle (ecology) , chemical engineering , nanotechnology , composite material , electrode , electrical engineering , chemistry , geology , engineering , oceanography
The electrochemical and structural stabilities of a conventional Li[Ni 0.90 Co 0.045 Mn 0.045 Al 0.01 ]O 2 (NCMA90) cathode and a core–shell with concentration gradient cathode (CSG‐NCMA90) are evaluated by cycling the cathodes at different depths of discharge (DoDs). The CSG‐NCMA90 cathode consists of fine, elongated primary particles that are radially aligned from the center of a spherical secondary particle. This unique microstructure effectively suppresses microcrack formation and propagation in the highly charged state. Moreover, microstructural analysis through transmission electron microscopy reveals that the thin elongated primary particles, largely featuring (001) facets on their lateral sides, are tolerant of electrolyte attack, thus suppressing surface degradation. In a full cell, these microstructural features enable the CSG‐NCMA90 cathode to retain 90.7% of its initial capacity after 1000 cycles at 100% DoD. Unlike conventional Ni‐rich layered cathodes whose capacity should be restricted to ≈60–80% to ensure their long service life, the proposed CSG‐NCMA90 cathode can be cycled at full capacity, thus facilitating higher electrochemical performance and realizing the development of economical Li‐ion batteries.