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Endowing an Intrinsic High-Capacity Primary Thin-Film Cathode With Cyclability.

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  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, Hubei, P. R. China.

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Summary

This study introduces an annealing-free Ag2O/V2O5 thin-film cathode for integrated micro-power sources. This novel material offers high energy density and process compatibility for Internet of Things (IoT) devices.

Keywords:
Ag2O/V2O5 composite filmsall‐solid‐state thin‐film batteriesannealing‐free cathodehigh‐capacity materialsmagnetron sputtering

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • The Internet of Things (IoT) requires advanced micro-power sources for on-chip integration.
  • All-solid-state thin-film batteries (ATFBs) are promising but limited by low cathode capacity and high-temperature processing.
  • Conventional methods are incompatible with temperature-sensitive electronic components.

Purpose of the Study:

  • To develop an annealing-free, high-performance thin-film cathode for ATFBs.
  • To enhance energy density and process compatibility for microelectronic applications.
  • To address limitations of current cathode materials and fabrication techniques.

Main Methods:

  • Fabrication of Ag2O/V2O5 composite thin-film cathode using magnetron co-sputtering at room temperature.
  • Utilizing the nanoconfinement effect of an amorphous V2O5 matrix.
  • Integration into ATFBs for performance evaluation.

Main Results:

  • The Ag2O/V2O5 cathode exhibits excellent lithium storage, with an initial discharge capacity of 171.0 µAh cm-2 µm-1.
  • Achieved 73% capacity retention after 1000 cycles, outperforming LiCoO2.
  • Demonstrated stable performance in ATFBs (71% retention over 400 cycles) and successfully powered sensors.

Conclusions:

  • The annealing-free Ag2O/V2O5 cathode offers a viable solution for high-energy-density, process-compatible micro-power sources.
  • This approach overcomes critical challenges in fabricating integrated power solutions for IoT and microelectronics.
  • Presents a new pathway for advanced battery materials in miniaturized electronic systems.