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Long‐Range Cationic Disordering Induces two Distinct Degradation Pathways in Co‐Free Ni‐Rich Layered Cathodes.
- 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]
- Subjects :
- CATHODES
SURFACE reconstruction
LITHIUM-ion batteries
Subjects
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