Work

Local Charge Distribution Modulation Enables Robust High-Entropy Layered Oxide Cathodes with Suppressed Lattice Strain for Sodium-Ion Batteries

Year: 2026

Type: article

Abstract: Layered oxides have garnered significant attention as cathode materials due to their high theoretical capacity and low cost for sodium-ion batteries (SIBs). However, the crystal structure suffers distortion induced by irreversible phase transitions during charge and discharge processes, and the poor air/moisture stability further constrains their practical application. Herein, we innovatively proposed a local charge distribution modulation strategy to develop a high-entropy NaLi0.05Ni0.3Fe0.15Cu0.05Mn0.35Ti0.1O2 (LNFCMT) cathode materials, both high-voltage lattice distortion was suppressed and air/moisture stability was enhanced, bringing outstanding electrochemical performance and practical usability. By incorporating Li to strengthen the Na-O bond, and utilizing Cu and Ti to regulate interlayer oxygen charge and stabilize the lattice framework, respectively. Consequently, the LNFCMT cathode demonstrates outstanding rate performance (132.5 mAh g-1 at 1 C within 2.0-4.3 V), superior cycling stability (78.6% capacity retention at 1 C after 100 cycles within 2.0-4.3 V), low lattice strain (lattice spacing change of 0.55%), and excellent practical prospects (73.3% capacity retention at 0.2 C after 100 cycles for the full-cell system). This work provides new insights into phase stability and air/moisture stability layered oxide cathodes for SIBs.

Source: Energy & Fuels

DOI: 10.1021/acs.energyfuels.6c00814