Mitigating Lattice Distortion of High-Voltage LiCoO2 via Core-Shell Structure Induced by Cationic Heterogeneous Co-Doping for Lithium-Ion Batteries

Heterogeneous co-doping High-voltage stability Technology Core-shell structure T Lithium-ion battery LiCoO2 02 engineering and technology 0210 nano-technology Core–shell structure Article
DOI: 10.1007/s40820-023-01269-1 Publication Date: 2023-12-11T17:04:22Z
ABSTRACT
Abstract Inactive elemental doping is commonly used to improve the structural stability of high-voltage layered transition-metal oxide cathodes. However, one-step co-doping strategy usually results in small grain size since low diffusivity ions such as Ti 4+ will be concentrated on boundaries, which hinders growth. In order synthesize large single-crystal cathodes, considering different diffusivities dopant ions, we propose a simple two-step multi-element fabricate core–shell structured LiCoO 2 (CS-LCO). current work, high-diffusivity Al 3+ /Mg 2+ occupy core while enrich shell layer. The -enriched layer (~ 12 nm) with Co/Ti substitution and stronger Ti–O bond gives rise less oxygen ligand holes. In-situ XRD demonstrates constrained contraction c -axis lattice parameter mitigated distortion. Under high upper cut-off voltage 4.6 V, CS-LCO maintains reversible capacity 159.8 mAh g −1 good retention ~ 89% after 300 cycles, reaches specific 163.8 at 5C. proposed can extended other pairs low- (Zr , Ta 5+ W 6+ etc.) cations (Zn Ni Fe for rational design advanced cathodes lithium-ion batteries.
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