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Batteries and Fuel Cells03:12

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Updated: Jun 28, 2025

Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing
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Dry-processed technology for flexible and high-performance FeS2-based all-solid-state lithium batteries at low stack

Chao Shen1, Libin Hu1, Haihua Tao2

  • 1School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.

Journal of Colloid and Interface Science
|April 13, 2024
PubMed
Summary

A new dry process using polytetrafluoroethylene (PTFE) binder enables scalable fabrication of flexible all-solid-state lithium batteries (ASSLBs) with iron disulfide (FeS2) cathodes. This method achieves high performance and stability under low pressure, advancing ASSLB technology.

Keywords:
All-solid-state lithium batteriesDry electrode technologyFeS(2) cathodeFlexible electrode membraneLow stacking pressure

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state lithium batteries (ASSLBs) offer high energy density and safety but face fabrication challenges with sulfide cathodes.
  • Conventional methods require ultrahigh pressure, hindering scalable production of transition metal sulfide-based ASSLBs.

Purpose of the Study:

  • To develop a scalable dry process for fabricating flexible FeS2-based ASSLBs using a polytetrafluoroethylene (PTFE) binder.
  • To investigate the impact of low stack pressure and PTFE binder on ASSLB performance and stability.

Main Methods:

  • A dry process methodology utilizing fibrous PTFE to create interweaving between Li6PS5Cl electrolyte particles and FeS2 cathode components.
  • Formation of flexible electrolyte and composite cathode membranes with enhanced adhesion under low stacking pressure (100 MPa).
  • Electrochemical characterization, including rate performance, cyclic stability, and detailed dQ/dV analysis.

Main Results:

  • Fabrication of flexible FeS2-based ASSLBs with outstanding rate performance and cyclic stability under low stack pressure.
  • Achieved a reversible discharged capacity of 370.7 mAh g-1 at 0.3C after 200 cycles.
  • Demonstrated that PTFE binder effectively integrates discharge products (Li2S and Fe) into the conductive network, preventing electrochemical inactivation.

Conclusions:

  • The PTFE-based dry process is a feasible and scalable technology for manufacturing high-performance ASSLBs.
  • This method overcomes the limitations of conventional high-pressure fabrication, paving the way for practical applications of ASSLBs.
  • The study provides valuable insights into binder strategies for enhancing the electrochemical performance and stability of sulfide-based ASSLBs.