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Activating Reversible V/V Redox Couple in NASICON-Type Phosphate Cathodes by High Entropy Substitution for Sodium-Ion Batteries.
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January 2025
Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, P. R. China.
Vanadium-based Na superionic conductor (NASICON) type materials (NaVM(PO), M = transition metals) have attracted extensive attention when used as sodium-ion batteries (SIBs) cathodes due to their stable structures and large Na diffusion channels. However, the materials have poor electrical conductivity and mediocre energy density, which hinder their practical applications. Activating the V/V redox couple (V/V≈4.
View Article and Find Full Text PDFMetal-Ligand Spin-Lock Strategy for Inhibiting Anion Dimerization in Li-Rich Cathode Materials.
J Am Chem Soc
January 2025
Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials, School of Materials Science and Engineering, Peking University, Beijing 100871, P. R. China.
Article Synopsis
- Anion dimerization in Li-rich cathode materials hampers the performance of Li-ion batteries by causing rapid capacity loss and poor reaction kinetics.
- The proposed metal-ligand spin-lock strategy utilizes an Fe-Ni couple to stabilize the spin orientations of anion electrons, effectively reducing anion dimerization.
- Experimental results with ID-LTS and other materials showed improved electrochemical performance, validating the potential of this strategy for developing better high-energy-density battery materials.
Atomistic Interpretation of the Oxygen K-Edge X-ray Absorption Spectra of Layered Li-Ion Battery Cathode Materials.
Chem Mater
November 2024
Department of Materials, Oxford University, Oxford OX1 3PH, U.K.
Article Synopsis
- Core loss spectroscopies offer detailed insights into redox processes in Li-ion battery cathodes, necessitating precise interpretation of their spectral features, particularly the oxygen K-edge spectra of lithium transition-metal oxides (LiMO).
- Using density-functional theory (DFT), three exchange-correlation functionals were applied to simulate the spectra, with rSCAN showing a better alignment with experimental data compared to PBE and PBE +, especially for energies near the main edge.
- The study demonstrates that DFT can effectively link experimental spectroscopic signatures to theoretical models, revealing the impact of structural distortions, chemical composition, and magnetism on the differentiation of materials with similar structures and magnetic states.
Strong Magnetic Exchange Interactions and Delocalized Mn-O States Enable High-Voltage Capacity in the Na-Ion Cathode P2-Na[MgMn]O.
Chem Mater
October 2024
Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom.
The increased capacity offered by oxygen-redox active cathode materials for rechargeable lithium- and sodium-ion batteries (LIBs and NIBs, respectively) offers a pathway to the next generation of high-gravimetric-capacity cathodes for use in devices, transportation and on the grid. Many of these materials, however, are plagued with voltage fade, voltage hysteresis and O loss, the origins of which can be traced back to changes in their electronic and chemical structures on cycling. Developing a detailed understanding of these changes is critical to mitigating these cathodes' poor performance.
View Article and Find Full Text PDFRevealing the Role of Ruthenium on the Performance of P2-Type NaMnRuO Cathodes for Na-Ion Full-Cells.
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December 2024
Department of Chemistry, Bogazici University, Istanbul, 34342, Türkiye.
Herein, P2-type layered manganese and ruthenium oxide is synthesized as an outstanding intercalation cathode material for high-energy density Na-ion batteries (NIBs). P2-type sodium deficient transition metal oxide structure, NaMnRuO cathodes where x varied between 0.05 and 0.
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