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Meng Tian1, Yurui Gao2, Ruijuan Xiao1

  • 1Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. zxwang@iphy.ac.cn and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.

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Summary
This summary is machine-generated.

Researchers investigated molybdenum (Mo) ion shuttling in lithium-rich cathode materials. Substituting Mo with antimony (Sb) enhances structural stability and improves rate performance for advanced lithium-ion batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Lithium-molybdenum oxide (Li 2 MoO 3 ) is a promising alternative to lithium-manganese oxide (Li 2 MnO 3 ) for Li-rich cathode materials due to superior physical and electrochemical properties.
  • Molybdenum (Mo) ion migration between Li and Mo layers during electrochemical Li-extraction compromises the structural integrity of Mo-based Li-rich cathodes.

Purpose of the Study:

  • To elucidate the underlying mechanisms of Mo-ion migration in Li 2 MoO 3 .
  • To identify substituent elements capable of mitigating Mo-ion shuttling and enhancing structural stability.
  • To evaluate the impact of substitution on the kinetic properties and rate performance of Li 2 MoO 3 .

Main Methods:

  • First-principles calculations utilizing the nudged energy band method to analyze Mo-ion migration pathways.
  • Molecular dynamics simulations to assess the kinetic behavior of pristine and substituted Li 2 MoO 3 .
  • Screening of various transition metals as potential substituents for Mo.

Main Results:

  • The nudged energy band method identified the fundamental reasons for Mo-ion mobility.
  • Molecular dynamics simulations confirmed the kinetic impact of ion migration.
  • Antimony (Sb) emerged as a highly effective substituent, significantly improving structural stability.

Conclusions:

  • Antimony (Sb) substitution is a viable strategy to enhance the structural robustness of Li 2 MoO 3 -based Li-rich cathode materials.
  • Sb substitution not only stabilizes the structure but also improves the rate capability of the material.
  • This study provides a computational framework for designing stable and high-performance Li-rich cathode materials.