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Updated: Aug 6, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Ultra-Thin Lithium Silicide Interlayer for Solid-State Lithium-Metal Batteries.

Jaekyung Sung1,2, So Yeon Kim1, Avetik Harutyunyan3

  • 1Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.

Advanced Materials (Deerfield Beach, Fla.)
|March 19, 2023
PubMed
Summary

A novel nanoporous interlayer stabilizes solid-state batteries by controlling lithium metal deposition. This enhances battery performance and longevity for next-generation energy storage.

Keywords:
all-solid-state-batteryinterlayerlithium metal anodemixed ionic and electronic conductor

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state batteries (ASSBs) with metallic lithium anodes are crucial for high-energy-density storage.
  • Instability at the solid electrolyte/lithium metal interface impedes ASSB performance and safety.
  • Developing stable interfaces is key to realizing practical ASSBs.

Purpose of the Study:

  • To engineer an ultra-thin, nanoporous interlayer to stabilize the lithium metal anode interface in ASSBs.
  • To investigate the interlayer's role in regulating lithium deposition/stripping and mechanical behavior.
  • To evaluate the performance of ASSBs utilizing the novel interlayer.

Main Methods:

  • Fabrication of a nanoporous mixed ionic and electronic conductor (MIEC) interlayer composed of lithium silicide and carbon nanotubes.
  • Characterization of the MIEC interlayer's physical, chemical, and electrochemical properties.
  • Assembly and testing of full ASSB cells with the MIEC interlayer and a LiNi0.8Co0.1Mn0.1O2 cathode.

Main Results:

  • The MIEC interlayer (≈3.25 µm) is thermodynamically stable and lithiophilic, promoting uniform lithium deposition.
  • Nanopores (<100 nm) in the interlayer confine lithium, leveraging "smaller is much softer" plasticity to prevent mechanical damage to the solid electrolyte.
  • Full cells achieved a high specific capacity (207.8 mAh g⁻¹), 92.0% initial Coulombic efficiency, and 88.9% capacity retention over 200 cycles.
  • Excellent rate capability was demonstrated, retaining 76% capacity at 5 C.

Conclusions:

  • The developed MIEC interlayer effectively addresses the SE/Li interface instability in ASSBs.
  • The interlayer's unique nanoporous structure and material properties enable stable cycling and improved battery performance.
  • This work presents a promising strategy for developing high-performance and safe metallic lithium-based ASSBs.