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Defects and lithium migration in Li2CuO2.

Apostolos Kordatos1, Navaratnarajah Kuganathan2, Nikolaos Kelaidis1

  • 1Faculty of Engineering, Environment and Computing, Coventry University, Priory Street, Coventry, CV1 5FB, United Kingdom.

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|May 2, 2018
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Summary
This summary is machine-generated.

Defect engineering in lithium copper oxide (Li2CuO2) enhances lithium ion battery performance. Aluminium doping effectively increases lithium vacancies, crucial for faster ion transport in cathodes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Materials Science

Background:

  • Lithium copper oxide (Li2CuO2) is a promising cathode material for lithium-ion batteries.
  • Understanding defect processes and lithium migration is key to optimizing its electrochemical performance.

Purpose of the Study:

  • To investigate defect mechanisms, electronic structure, and lithium migration in Li2CuO2 using atomistic simulations.
  • To explore defect engineering strategies, specifically doping, to enhance lithium vacancy concentration and mobility.

Main Methods:

  • Atomistic simulation methods were employed.
  • Calculations included defect energies, electronic structure, and migration barriers.
  • The effects of aluminium doping on defect formation and migration were analyzed.

Main Results:

  • The intrinsic lithium migration energy via the vacancy mechanism is low (0.11 eV).
  • High lithium Frenkel energy (1.88 eV/defect) necessitates defect engineering.
  • Aluminium doping significantly reduces lithium vacancy formation energy to 0.97 eV but slightly increases migration barrier to 0.22 eV.
  • Aluminium doping introduces electronic states into the band gap.

Conclusions:

  • Aluminium doping is an effective strategy to increase lithium vacancy concentration in Li2CuO2.
  • This doping approach enhances lithium self-diffusion kinetics with a minimal impact on migration barriers.
  • The findings provide insights for designing improved cathode materials for lithium-ion batteries.