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Elastomeric Electrolyte for High Capacity and Long-Cycle-Life Solid-State Lithium Metal Battery.

Zekun Zhou1, Zengren Tao1, Ruiyong Chen2

  • 1Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.

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Summary

Researchers developed a novel solid-state polymer electrolyte (SSPE) for lithium metal batteries. This SSPE exhibits high ionic conductivity and excellent stability, paving the way for safer, high-performance batteries.

Keywords:
elastomerslithium metal batteriespolymer-in-saltsolid-state electrolytesstructure-property correlation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid-state electrolytes are crucial for lithium metal batteries, requiring high ionic conductivity and compatibility with battery components.
  • Existing electrolytes often face challenges with interfacial stability and performance at room temperature.

Purpose of the Study:

  • To develop a solid-state polymer electrolyte (SSPE) with enhanced ionic conductivity and electrochemical stability.
  • To investigate the structural properties influencing ion transport and interfacial behavior.
  • To evaluate the performance of the SSPE in lithium metal battery applications.

Main Methods:

  • Preparation of SSPE using two-roll milling and interface wetting techniques.
  • Characterization of ionic conductivity, electrochemical stability, and interfacial properties.
  • Advanced structural analysis using synchrotron radiation Fourier-transform infrared microscopy and X-ray scattering techniques.
  • Electrochemical testing of Li||SSPE||LFP coin cells at room temperature.

Main Results:

  • The SSPE achieved a high room temperature ionic conductivity of 4.6×10-4 S cm-1.
  • Demonstrated excellent electrochemical oxidation stability up to 5.08 V and improved interface stability.
  • Li||SSPE||LFP coin cells showed high capacity (161.5 mAh g-1 at 0.1 C) and long cycle life (50% capacity retention after 2000 cycles).
  • Good rate capability was observed, with performance maintained up to 5 C.

Conclusions:

  • The developed SSPE meets critical electrochemical and mechanical requirements for practical lithium metal batteries.
  • Continuous ion conductive paths formed within the electrolyte contribute to its high performance.
  • This study presents a promising solid-state electrolyte for advancing lithium metal battery technology.