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Multiscale Engineered Bionic Solid-State Electrolytes Breaking the Stiffness-Damping Trade-Off.

Junyu Hou1, Wu Sun1, Qunyao Yuan1

  • 1Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200438, P. R. China.

Angewandte Chemie (International Ed. in English)
|January 18, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a bionic composite solid-state electrolyte inspired by tooth enamel. This innovative material overcomes the stiffness-damping trade-off, enabling safer and more efficient all-solid-state lithium metal batteries.

Keywords:
All-Solid-State Lithium Metal BatteriesAmorphous Ceramic ArraysBiomimetic SynthesisSolid-State Electrolytes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state lithium metal batteries (LMBs) offer enhanced safety and energy density for next-generation energy storage.
  • Key challenges include lithium dendrite formation and poor mechanical compatibility of solid-state electrolytes with electrodes, often involving a trade-off between stiffness and damping.

Purpose of the Study:

  • To develop a composite solid-state electrolyte that simultaneously achieves high stiffness and damping, addressing the inherent trade-off.
  • To inhibit lithium dendrite growth and ensure intimate electrode contact for improved battery performance.

Main Methods:

  • A bionic composite solid-state electrolyte was engineered, mimicking the superstructure of tooth enamel.
  • The electrolyte consists of amorphous ceramic nanotube arrays intertwined with solid polymer electrolytes.
  • Material properties, including stiffness, damping, ionic conductivity, and Li+ transference number, were characterized.

Main Results:

  • The bionic electrolyte demonstrated high stiffness (Young's modulus=15 GPa, hardness=0.13 GPa) and damping (tanδ=0.08), successfully breaking the stiffness-damping trade-off.
  • It effectively inhibited lithium dendrite growth and maintained intimate contact with electrodes.
  • The electrolyte exhibited a Li+ transference number of 0.62 and room temperature ionic conductivity of 1.34×10⁻⁴ S cm⁻¹.
  • Assembled Li symmetric batteries showed ultra-stable cycling (>2000 hours at 0.1 mA cm⁻² at 60°C).
  • All-solid-state full cells (LiFePO4/Li and LiNi0.8Co0.1Mn0.1O2/Li) demonstrated excellent cycling performance.

Conclusions:

  • The bionic composite solid-state electrolyte provides a promising strategy for developing high-performance and safe all-solid-state lithium metal batteries.
  • The biomimetic design effectively addresses critical challenges in solid-state electrolyte development, paving the way for advanced energy storage solutions.