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Double-Layer Polymer Electrolyte for High-Voltage All-Solid-State Rechargeable Batteries.

Weidong Zhou1, Zhaoxu Wang2, Yuan Pu1

  • 1Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China.

Advanced Materials (Deerfield Beach, Fla.)
|December 6, 2018
PubMed
Summary
This summary is machine-generated.

A novel double-layer polymer electrolyte enables stable, high-voltage lithium-metal battery cycling. This innovative material facilitates dendrite-free lithium plating and efficient ion extraction without electrolyte oxidation, enhancing battery performance and safety.

Keywords:
interfaceslithium batteriespolymer Li+ conductivityrechargeable batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • High-voltage lithium-metal batteries require electrolytes with wide energy gaps to prevent anode dendrites and cathode oxidation.
  • Existing single-layer electrolytes fail to meet these demanding requirements for stable cycling.

Purpose of the Study:

  • To investigate a double-layer polymer electrolyte for high-voltage lithium-metal batteries.
  • To achieve dendrite-free lithium plating and stable Li+ extraction from oxide cathodes.

Main Methods:

  • Fabrication of a double-layer polymer electrolyte using poly(ethylene oxide) and poly(N-methyl-malonic amide).
  • Testing the electrolyte in a 4 V lithium-metal cell under charge/discharge cycling at 65 °C.
  • Analysis of interface stability and Li+ conductivity.

Main Results:

  • The double-layer electrolyte demonstrated dendrite-free lithium plating and stable Li+ extraction.
  • No electrolyte oxidation was observed at the cathode interface during high-voltage operation.
  • Stable charge/discharge cycling was achieved at 65 °C.
  • Interfaces between the polymer layers remained stable with no significant loss of Li+ conductivity.

Conclusions:

  • A double-layer polymer electrolyte effectively addresses the limitations of single-layer electrolytes in high-voltage lithium-metal batteries.
  • This approach offers a promising pathway for developing safer and more efficient energy storage systems.