Shaohua Guo and Haoshen Zhou’s Research Groups: Achieving a Deeply Desodiated Stabilized Cathode Material by the High Entropy Strategy for Sodium-ion Batteries
Manganese-based layered oxides are currently of significant interest as cathode materials for sodium-ion batteries due to their low toxicity and high specific capacity. However, the practical applications are impeded by sluggish intrinsic Na+ migration and poor structure stability as a result of Jahn-Teller distortion and complicated phase transition. In this study, a high-entropy strategy is proposed to enhance the high-voltage capacity and cycling stability. The designed P2-Na0.67Mn0.6Cu0.08Ni0.09Fe0.18Ti0.05O2 achieves a deeply desodiation and delivers charging capacity of 158.1 mA h g-1 corresponding to 0.61Na with a high initial Coulombic efficiency of 98.2%. The charge compensation is attributed to the cationic and anionic redox reactions conjunctively. Moreover, the crystal structure is effectively stabilized, leading to a slight variation of lattice parameters. This research carries implications for the expedited development of low-cost, high-energy-density cathode materials for sodium-ion batteries.
Figure a), b) Charge and discharge curves and c) Cycling performances of MCNFT and NMO within a voltage range of 2.0 - 4.5 V at 10 mA g-1. Inset shows the capacity retention over 15 cycles. d) Line-scan EELS spectra recorded from the surface to the bulk. e) Energy barriers and pathways for Na+ migration in Na0.31[TM]O2. f) The lattice parameters with varying Na contents (x) in MCNFT and NMO from x = 0.67 to 0.06
The above result entitled “Achieving a Deeply Desodiated Stabilized Cathode Material by the High Entropy Strategy for Sodium-ion Batteries” is published on Angew. Chem. Int. Ed. Prof. Shaohua Guo and Prof. Haoshen Zhou are the corresponding authors of the paper. Zhaoguo Liu is the first authors. The authors thank the National Key R&D Program of China, the National Natural Science Foundation of China, the Natural Science Foundation of Jiangsu Province, etc for the funding support.
Article Link: https://doi.org/10.1002/anie.202405620
