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In‐Depth TEM Investigation on Structural Inhomogeneity within a Primary Li x Ni 0.835 Co 0.15 Al 0.015 O 2 Particle: Origin of Capacity Decay during High‐Rate Discharge
Author(s) -
Lee Hyesu,
Jo Eunmi,
Chung Kyung Yoon,
Byun Dongjin,
Kim Seung Min,
Chang Wonyoung
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201910670
Subject(s) - spinel , structural stability , cathode , electrochemistry , materials science , cutoff , voltage , electrode , high voltage , structural material , nanotechnology , analytical chemistry (journal) , composite material , chemistry , metallurgy , physics , structural engineering , quantum mechanics , engineering , chromatography
The structural stability of cathode materials during electrochemical reactions, in particular, under high‐rate discharge, is pertinent to the design and development of new electrode materials. This study investigates the structural inhomogeneity that develops within a single LiNi 0.835 Co 0.15 Al 0.015 O 2 (NCA83) particle during a fast discharging process under different cutoff voltages. Some of the NCA83 particles discharged from a high cutoff voltage (4.8 V) developed surface areas in which the layered structure was recovered, although the interiors retained the degraded spinel structure. These micro‐ and nano‐scale structural inversions from high cutoff voltage seem highly correlated with structural evolutions in the initial charged state, and may ultimately degrade the cycling stability. This study advances understanding of the structural inhomogeneity within primary particles during various electrochemical processes and may facilitate the development of new Ni‐rich cathode materials.