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Related Concept Videos

Processes at Electrodes01:30

Processes at Electrodes

98
The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
98

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High Entropy Fine-Tuning Achieves Fast Li+ Kinetics in High-Performance Co-Free High-Ni Layered Cathodes.

Yang Liu1, Yan Xin1, Bijiao He1

  • 1Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education and School of Energy Power and Mechanical Engineering, and Beijing Laboratory of New Energy Storage Technology, North China Electric Power University, Beijing, 102206, China.

Advanced Materials (Deerfield Beach, Fla.)
|January 27, 2025
PubMed
Summary

This study introduces a novel high-entropy doped cobalt-free high-nickel cathode for advanced lithium-ion batteries. The material demonstrates improved lithium-ion kinetics and stability, paving the way for next-generation energy storage.

Keywords:
co‐free cathode materialfast Li+ kineticshigh‐entropy fine‐tuninglithium‐ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Cobalt-free high-nickel layered oxides (LiNixMeyO2) are crucial for next-generation high-energy lithium-ion batteries (LIBs) due to their high capacity and lower cost.
  • However, challenges like hindered Li+ kinetics and Ni4+ reactivity limit their rate performance and cycling stability.

Purpose of the Study:

  • To design a high-performance, high-entropy doped cobalt-free high-nickel layered cathode material.
  • To overcome the limitations of poor rate capability and cycling stability in current cobalt-free high-nickel cathodes.

Main Methods:

  • Elemental screening and compositional fine-tuning were employed to develop the high-entropy doped cathode LiNi0.9Mn0.03Mg0.02Ta0.02Mo0.02Na0.01O2 (HE-Ni90-1.557).
  • Investigated the synergistic effects of high-entropy dopants on Li+ kinetics, phase transitions, and material stability.

Main Results:

  • Compositional fine-tuning optimized dopant synergy, suppressing Li+/Ni2+ mixing and enhancing Li+ diffusion kinetics.
  • The 'pillar effect' improved Li+ diffusion at high states of charge, while high-entropy doping delayed phase transitions and reduced transition metal dissolution.
  • The HE-Ni90-1.557 cathode achieved an initial capacity of 225.1 mAh g-1 at 0.2 C and 83.1% retention after 1500 cycles at 3C in a full cell.

Conclusions:

  • The developed high-entropy doping strategy significantly enhances Li+ diffusion kinetics at both atomic and particle levels.
  • This research offers a viable pathway for the commercialization of cobalt-free high-nickel cathodes for advanced LIBs.