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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state thin-film lithium batteries (TFBs) are vital for microelectronics but face challenges with interfacial instability and poor solid contact between cathode and electrolyte films.
  • These limitations hinder the application of high-voltage TFBs, necessitating improved interface engineering.

Purpose of the Study:

  • To enhance the interfacial contact and stability of high-voltage LiCoO2 (LCO)/LiPON thin-film lithium batteries.
  • To investigate the effect of a LiF interlayer on suppressing interfacial deterioration and improving battery performance.

Main Methods:

  • Fabrication of preferentially orientated LiCoO2 (LCO) nanocolumns and LCO/LiPON/Li TFBs using in situ heating sputtering.
  • Introduction of a LiF interlayer between the LCO cathode and LiPON electrolyte.
  • In situ and ex situ characterization techniques to analyze elemental diffusion, morphology, and interfacial properties.

Main Results:

  • The LiF interlayer significantly improved the solid contact at the LCO/LiPON interface.
  • Elemental diffusion, morphology changes, and interfacial deterioration were effectively suppressed.
  • The LCO/LiF/LiPON/Li TFB demonstrated superior stability and higher capacity compared to TFBs without the LiF interlayer.

Conclusions:

  • Introducing a LiF interlayer is an effective strategy to enhance solid contact and improve the performance of high-voltage all-solid-state thin-film lithium batteries.
  • This work provides valuable insights for designing more robust and efficient solid-state batteries for advanced electronic devices.