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Long‐Range Cationic Disordering Induces two Distinct Degradation Pathways in Co‐Free Ni‐Rich Layered Cathodes.

Authors :
Hua, Weibo
Zhang, Jilu
Wang, Suning
Cheng, Yi
Li, Hang
Tseng, Jochi
Wu, Zhonghua
Shen, Chong‐Heng
Dolotko, Oleksandr
Liu, Hao
Hung, Sung‐Fu
Tang, Wei
Li, Mingtao
Knapp, Michael
Ehrenberg, Helmut
Indris, Sylvio
Guo, Xiaodong
Source :
Angewandte Chemie; 3/13/2023, Vol. 135 Issue 12, p1-14, 14p
Publication Year :
2023

Abstract

Ni‐rich layered oxides are one of the most attractive cathode materials in high‐energy‐density lithium‐ion batteries, their degradation mechanisms are still not completely elucidated. Herein, we report a strong dependence of degradation pathways on the long‐range cationic disordering of Co‐free Ni‐rich Li1−m(Ni0.94Al0.06)1+mO2 (NA). Interestingly, a disordered layered phase with lattice mismatch can be easily formed in the near‐surface region of NA particles with very low cation disorder (NA‐LCD, m≤0.06) over electrochemical cycling, while the layered structure is basically maintained in the core of particles forming a "core–shell" structure. Such surface reconstruction triggers a rapid capacity decay during the first 100 cycles between 2.7 and 4.3 V at 1 C or 3 C. On the contrary, the local lattice distortions are gradually accumulated throughout the whole NA particles with higher degrees of cation disorder (NA‐HCD, 0.06≤m≤0.15) that lead to a slow capacity decay upon cycling. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00448249
Volume :
135
Issue :
12
Database :
Complementary Index
Journal :
Angewandte Chemie
Publication Type :
Academic Journal
Accession number :
162268032
Full Text :
https://doi.org/10.1002/ange.202214880