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Lignin-Based Separators for Lithium-Ion Batteries via a Dry Fibrillation Method.

Huanhuan Jia1, Jingjing Liu1, Boling Liu1

  • 1Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, 48824, USA.

Advanced Materials (Deerfield Beach, Fla.)
|March 26, 2025
PubMed
Summary

Researchers developed a novel, ultrathin lignin-based separator for lithium-ion batteries. This sustainable separator enhances thermal stability and cycling performance, offering a promising alternative for electric vehicles.

Keywords:
dry processsulfonate‐derived SEIthermally stable separatorultrathin lignin‐based separator

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Chemistry

Background:

  • Separators are vital in lithium-ion batteries (LIBs) for safety and performance.
  • Current polyolefin separators have limitations like poor thermal stability and wettability.
  • These limitations impact the safety and lifespan of LIBs, especially in electric vehicles.

Purpose of the Study:

  • To develop a novel, single-layer ultrathin separator for LIBs using lignin.
  • To evaluate the thermal stability and cycling performance of the lignin-based separator.
  • To explore the potential of sustainable, bio-derived materials in advanced battery technologies.

Main Methods:

  • Fabrication of a 15 µm single-layer separator from lignosulfonate via dry fibrillation.
  • Assessment of intrinsic thermal stability and wettability.
  • Electrochemical testing in graphite||NMC811 and Si-Gr||NMC811 cells to evaluate cycling performance.

Main Results:

  • Demonstrated an ultrathin (15 µm) lignin-based separator with exceptional thermal stability.
  • Achieved improved cycling performance in LIBs attributed to sulfonate groups promoting stable interfaces.
  • The dry fibrillation method showed low energy consumption and high material conversion (100%).

Conclusions:

  • Lignin-based separators offer a sustainable and high-performance alternative to conventional polyolefin separators.
  • The abundant sulfonate groups enhance interfacial stability and reduce resistance in LIBs.
  • This work provides inspiration for next-generation functional separators for high-performance LIBs.