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LiCoO2 cathode surface modification with optimally structured Li3PO4 for outstanding high-voltage cycling

Yuxuan Ji1, Jian Wei1, Di Liang1

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Researchers developed a cost-effective method to coat lithium cobalt oxide (LCO) cathodes with lithium phosphate (Li3PO4). This enhances battery performance and safety by improving conductivity and stability for high-voltage applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Increasing operating voltage of lithium cobalt oxide (LCO) cathodes boosts specific capacity but causes capacity decay and safety issues.
  • Lithium phosphate (Li3PO4) coating enhances energy density in lithium-ion batteries through ionic conduction.
  • Improved cathode material conductivity is crucial for high-voltage operation to meet market demands.

Purpose of the Study:

  • To develop a facile and economical method for coating LCO with Li3PO4.
  • To balance ionic conductivity and chemical stability of LCO cathodes.
  • To improve the performance and cycle life of high-voltage LCO cathodes.

Main Methods:

  • Direct facile coprecipitation method used for coating crystallized Li3PO4 onto an LCO surface.
  • Characterization of the LCO@Li3PO4 composite material.
  • Electrochemical testing of the optimized LP-3 cathode.

Main Results:

  • The LCO@Li3PO4 composite exhibits superior electrical contact and stabilizes the cathode surface by reducing SEI/CEI formation.
  • Optimized LP-3 cathode delivered a high initial discharge capacity of 181 mA h g⁻¹ at 0.5C.
  • Achieved 75% capacity retention after 200 cycles, indicating prolonged cycle life.

Conclusions:

  • The coprecipitation method provides a viable and economical strategy for producing high-voltage LCO cathodes.
  • Li3PO4 coating effectively enhances ionic conductivity and chemical stability, leading to improved battery performance.
  • This approach offers a competitive solution for advanced lithium-ion battery applications.