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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Current lithium-ion battery power is limited by cathode thickness, hindering electric transport electrification.
  • Specific power is restricted to a few thousand W kg-1, insufficient for advanced applications.

Purpose of the Study:

  • To present a novel design for monolithically-stacked thin-film cells to enhance battery power capability.
  • To demonstrate a proof-of-concept for this new battery architecture.

Main Methods:

  • Fabrication of monolithically-stacked thin-film cells with silicon anodes, solid-oxide electrolytes, and lithium cobalt oxide cathodes.
  • Experimental cycling of the stacked cells.
  • Utilizing a thermo-electric model for performance prediction.

Main Results:

  • Demonstrated a functional proof-of-concept with two stacked thin-film cells.
  • The battery achieved over 300 cycles between 6 and 8 V.
  • Predicted specific energies exceeding 250 Wh kg-1 at C-rates above 60.

Conclusions:

  • The monolithically-stacked thin-film battery design has the potential to increase power ten-fold.
  • This technology can achieve specific powers of tens of kW kg-1.
  • Enables high-end applications such as drones, robots, and electric vertical take-off and landing aircraft.