Environment Development and Sustainability, Journal Year: 2024, Volume and Issue: unknown
Published: Nov. 12, 2024
Language: Английский
EcoEnergy, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 20, 2025
Abstract Ni‐rich cathodes are more promising candidates to the increasing demand for high capacity and ability operate at voltages. However, Ni content creates a trade‐off between energy density cycling stability, mainly caused by chemo‐mechanical degradation. Oxygen evolution, cation mixing, rock salt formation, phase transition, crack formation contribute degradation process. To overcome this problem, strategies such as doping, surface coating, core‐shell structures have been employed. The advantage of doping is engineer cathode surface, structure, particle morphology simultaneously. This review aims summarize recent advances in understanding mechanism role different dopants enhancing thermal stability overall electrochemical performance. pinning pillaring effects on suppressing oxygen transition introduced. It found that higher ionic radii enable reside particles, preserving refining suppress formation. Finally, effect Li ion diffusion, rate capability, long‐term discussed.
Language: Английский
Citations
1
Materials, Journal Year: 2024, Volume and Issue: 17(11), P. 2697 - 2697
Published: June 3, 2024
Sodium-ion batteries (SIBs) have emerged as a promising alternative to lithium-ion (LIBs) due the abundance and low cost of sodium resources. Cathode material plays crucial role in performance ion determining capacity, cycling stability, rate capability. Na3V2(PO4)3 (NVP) is cathode its stable three-dimensional NASICON structure, but discharge capacity decay serious with increase cycle period. We focused on modifying NVP by coating carbon doping Nb5+ ions for synergistic electrochemical properties carbon-coated NVP@C material. X-ray diffraction analysis was performed confirm phase purity crystal structure doped material, which exhibited characteristic peaks that matched well structure. Nb5+-doped NVP@C@Nbx materials were prepared using sol–gel method characterized Diffraction (XRD), Scanning Electron Microscopy (SEM), Raman Brunauer -Emmett-Teller (BET) analysis. First-principles calculations based density functional theory. VASP PAW methods chosen these calculations. GGA PBE framework served exchange-correlation functional. The results showed unit cell consisted six structural motifs, each containing octahedral VO6 tetrahedral PO4 groups form polyanionomer [V2(PO4)3] along c-axis direction groups, had Na1(6b) Na2(18e) sites. And PDOS revealed after Nb doping, d orbitals atoms also contributed electrons concentrated near Fermi surface. Additionally, decrease effective mass indicated could move more freely through implying an enhancement electron mobility. NVP@C@Nb evaluated cyclic voltammetry (CV), galvanostatic charge-discharge tests, impedance spectroscopy (EIS), photoelectric (XPS). NVP@[email protected] achieved initial high 114.27 mAhg−1, 106.38 mAhg−1 maintained 500 cycles at 0.5C, retention composite reached impressive 90.22%. resistance enabling it create vacancies modulate ultimately enhancing NVP. outstanding can be attributed layer, not only improves electronic conductivity shortens diffusion length Na+ electrons, reduces volume changes electrode materials. These preliminary suggested as-obtained novel efficient energy storage.
Language: Английский
Citations
4
Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 19, 2025
Abstract Mn‐based layered oxides are one of the most appealing cathodes for potassium‐ion batteries (PIBs) due to its cost‐effective potassium and manganese resources, high theoretical specific capacity. However, severe phase transitions Jahn‐Teller distortion Mn 3+ have already hindered practical application. To circumvent these issues, a P2‐type K 0.67 0.75 Ni 0.23 Nb 0.02 O 2 (P2‐KMNNb) cathode is proposed where nickel niobium substitution enables increase non‐bonding oxygen states structural stability. Via electrochemical test physicochemical characterizations, it demonstrated that induces redox activity in ion battery system, favoring highly reversible + (de) intercalation capability. The P2‐KMNNb exhibits capacity 134.8 mAh g −1 at current density 10 mA , with retention 85.2% after 150 cycles. full cell, composed hard carbon anode, also shows excellent performance, achieving 63.6 large 200 an initial coulombic efficiency 95.2%. Meanwhile, situ X‐ray powder diffraction patterns Raman spectra show absence stable stacking sequence. These findings provide new strategies modulating reversibility structure.
Language: Английский
Citations
0
Materials Today Chemistry, Journal Year: 2025, Volume and Issue: 44, P. 102606 - 102606
Published: Feb. 26, 2025
Language: Английский
Citations
0
Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 689, P. 137241 - 137241
Published: March 4, 2025
Language: Английский
Citations
0
Journal of Energy Storage, Journal Year: 2025, Volume and Issue: 124, P. 116854 - 116854
Published: May 2, 2025
Language: Английский
Citations
0
Energy & Fuels, Journal Year: 2025, Volume and Issue: unknown
Published: May 21, 2025
Language: Английский
Citations
0
Solid State Ionics, Journal Year: 2025, Volume and Issue: 427, P. 116902 - 116902
Published: May 23, 2025
Language: Английский
Citations
0
Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 680, P. 505 - 517
Published: Nov. 19, 2024
Language: Английский
Citations
3
Journal of Energy Chemistry, Journal Year: 2025, Volume and Issue: unknown
Published: April 1, 2025
Language: Английский
Citations
0