Abstract
Sodium-ion batteries (SIBs) are considered as the most promising complementary energy storage system for large-scale application due to the high abundance of sodium. However, the irreversible phase transition and slow diffusion kinetics in O3-type layered transition metals oxides cathodes impede the development of advanced SIBs. Here we address this issue by introducing high-entropy doping regulation strategies, a series of NaNi0.4Mn0.3-xFe0.1Ti0.1SnxLi0.05Sb0.05O2 cathodes exhibit an excellent rate performance (>60 mAh g−1 at 6 A g−1) and prolonged cycle performance (capacity retention >80 % after 300 cycles, at 120 mA g−1). The correlations between the chemical compositions and the electrochemical properties in the designed high-entropy transition metal oxides cathodes were elucidated using a combination of analytical tools including all kinds of electrochemical techniques including galvanostatic intermittent titration technique (GITT) and density functional theory (DFT) calculations, in conjunction with in-situ X-ray diffraction (XRD). These studies revealed a P3-phase dominated solid-solution reaction during the charge/discharge process that boosts the sodium ions migration in the structure. This study provides a model for effective simultaneous electrochemical evaluation and structure evolution analysis of the multi-elements high-entropy metal oxide cathodes. The understanding gained, enables to apply a successful doping regulation procedure, thus paving the way for a rational design of optimal high-entropy multi-component NaTMO2 cathodes for rechargeable Na ions batteries.
Original language | English |
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Article number | 158997 |
Journal | Chemical Engineering Journal |
Volume | 504 |
DOIs | |
State | Published - 15 Jan 2025 |
Bibliographical note
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Keywords
- Cycle stability
- Fast-charge
- High-entropy oxides
- O3-type cathodes
- Sodium-ion batteries