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Enhancing Structural Rigidity of Ultrahigh-Ni Oxide Through Al and Nb Dual-Bulk-Doping for High-Voltage Lithium-Ion Batteries.

Enhancing Structural Rigidity of Ultrahigh-Ni Oxide Through Al and Nb Dual-Bulk-Doping for High-Voltage Lithium-Ion Batteries.

Authors :
Liu ZC
Wang F
Wang WN
Liu S
Gao XP
Source :
Small methods [Small Methods] 2024 May 02, pp. e2400224. Date of Electronic Publication: 2024 May 02.
Publication Year :
2024
Publisher :
Ahead of Print

Abstract

The pursuit of high energy densities propels the design of next-generation nickel-based layered oxide cathodes. The utilization of low-cobalt, ultrahigh-nickel layered oxide cathodes, and the extension of operating voltages promise enhanced energy density. However, stability and safety face challenges associated with nickel content, including structural degradation, lattice oxygen evolution, and thermal instability. In this study, a promising strategy of Al and Nb dual-bulk-doping is presented in high-Ni cathode materials of LiNi <subscript>0.96</subscript> Co <subscript>0.04</subscript> O <subscript>2</subscript> (NC) to stabilize the bulk structure, suppress oxygen release, and attain superior electrochemical performance at high voltages. The introduction of Al and Nb effectively raises the migration energy of Ni <superscript>2+</superscript> into Li sites and stabilizes lattice oxygen through strengthened Al─O and Nb─O bonds. Furthermore, the substitution of high-valence Nb ions reduces the charge depletion of lattice oxygen and induces an ordered microstructure. The Al and Nb dual-bulk-doping strategy mitigates strain and stress associated with the H2↔H3 phase transition, reducing the generation and propagation of microcracks. The resulting Li(Ni <subscript>0.96</subscript> Co <subscript>0.04</subscript> ) <subscript>0.985</subscript> Al <subscript>0.01</subscript> Nb <subscript>0.005</subscript> O <subscript>2</subscript> (NCAN) cathode exhibits superior cycling stability, with a capacity retention of 77.8% after 300 cycles, even when operating at a high-voltage of 4.4 V, outperforming the NC (48.5%). This work provides a promising perspective for developing high-voltage and high-Ni cathode materials.<br /> (© 2024 Wiley‐VCH GmbH.)

Details

Language :
English
ISSN :
2366-9608
Database :
MEDLINE
Journal :
Small methods
Publication Type :
Academic Journal
Accession number :
38697931
Full Text :
https://doi.org/10.1002/smtd.202400224