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New Class of Ni‐Rich Cathode Materials Li[Ni x Co y B 1− x − y ]O 2 for Next Lithium Batteries
Author(s) -
Ryu HoonHee,
Park NamYung,
Yoon Dae Ro,
Kim UnHyuck,
Yoon Chong S.,
Sun YangKook
Publication year - 2020
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.202000495
Subject(s) - cathode , microstructure , materials science , texture (cosmology) , crystallography , composite material , analytical chemistry (journal) , chemical engineering , chemistry , artificial intelligence , computer science , image (mathematics) , chromatography , engineering
A new class of layered cathodes, Li[Ni x Co y B 1− x − y ]O 2 (NCB), is synthesized. The proposed NCB cathodes have a unique microstructure in which elongated primary particles are tightly packed into spherical secondary particles. The cathodes also exhibit a strong crystallographic texture in which the a – b layer planes are aligned along the radial direction, facilitating Li migration. The microstructure, which effectively suppresses the formation of microcracks, improves the cycling stability of the NCB cathodes. The NCB cathode with 1.5 mol% B delivers a discharge capacity of 234 mAh g −1 at 0.1 C and retains 91.2% of its initial capacity after 100 cycles (compared to values of 229 mAh g −1 at 0.1 C and 78.8% for pristine Li[Ni 0.9 Co 0.1 ]O 2 ). This study shows the importance of controlling the microstructure to obtain the required cycling stability, especially for Ni‐rich layered cathodes, where the main cause of capacity fading is related to mechanical strain in their charged state.