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High Energy Density Solid State Lithium Metal Batteries Enabled by Sub-5 µm Solid Polymer Electrolytes.

Fei He1,2, Wenjing Tang1, Xinyue Zhang2

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Advanced Materials (Deerfield Beach, Fla.)
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Summary

This study introduces an ultrathin solid-state electrolyte for safer, high-energy solid-state batteries (SSBs). The novel design achieves high energy density and long lifespan, paving the way for advanced energy storage solutions.

Keywords:
3D ceramic fillershigh energy densitysolid-state Li metal batteriesultrathin polymer electrolytes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Solid-state batteries (SSBs) offer enhanced safety and energy density compared to traditional lithium-ion batteries.
  • Achieving high energy density in SSBs requires thin, lightweight solid-state electrolytes (SSEs) compatible with high-voltage cathodes and lithium metal anodes.
  • Current SSEs face challenges with mechanical integrity and safety risks as thickness decreases.

Purpose of the Study:

  • To develop a high-energy-density SSB with improved safety features.
  • To demonstrate a novel ultrathin bilayer SSE that addresses the limitations of existing solid-state electrolytes.
  • To enable practical application of SSBs by enhancing safety and performance.

Main Methods:

  • Fabrication of an ultrathin (4.2 µm) bilayer SSE incorporating a porous ceramic scaffold and a double-layer Li+-conducting polymer.
  • Characterization of the SSE's mechanical strength, electrochemical window, and ion conductivity.
  • Assembly and testing of SSBs using the developed SSE with LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes.

Main Results:

  • The composite SSE exhibits enhanced safety and mechanical strength due to the ceramic scaffold.
  • The bilayer polymer structure ensures compatibility with Li metal anodes and high-voltage cathodes.
  • Achieved high energy densities of 506 Wh kg-1 and 1514 Wh L-1 with a long cycle life (>3000 h).
  • Demonstrated high-energy-density anode-free cells.

Conclusions:

  • The proposed ultrathin bilayer SSE effectively balances high energy density and safety in solid-state batteries.
  • The ceramic scaffold and bilayer polymer design are crucial for improved ionic conduction, Li deposition regulation, and interfacial stability.
  • This work represents a significant advancement towards the commercialization of safe and high-performance solid-state batteries.