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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Synergistic Co-Optimization Strategy for Electron-Ion Transport Kinetics in all-Solid-State Sulfurized

Xuemei Ren1, Tianyu Lei1, Miao He1

  • 1State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China.

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Researchers developed a novel nanofibrous sulfurized polyacrylonitrile (SPAN) cathode for all-solid-state lithium-sulfur batteries. This design overcomes conductivity issues, significantly boosting battery performance and stability.

Keywords:
all‐solid‐state lithium‐sulfur batteriesconductive networkinterfacial evolutionsulfurized polyacrylonitrile cathodes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Sulfurized polyacrylonitrile (SPAN) cathodes offer high conductivity for lithium-sulfur batteries.
  • Current micron-sized granular SPAN (GSPAN) cathodes face limitations in all-solid-state lithium-sulfur batteries (ASSLSBs) due to poor electron/ion transport.
  • These limitations hinder electrochemical performance in ASSLSBs.

Purpose of the Study:

  • To address the electrochemical performance limitations of SPAN cathodes in ASSLSBs.
  • To design and fabricate a nanofibrous SPAN cathode (FSPAN) with enhanced charge transport pathways.
  • To validate a materials design strategy for improving ASSLSB performance.

Main Methods:

  • Fabrication of a nanofibrous SPAN cathode (FSPAN) using electrospinning and programmed pyrolysis.
  • Characterization of the 3D-interwoven nanofiber architecture for continuous conductive networks.
  • Evaluation of electrochemical performance, including specific capacity and rate capability.

Main Results:

  • The FSPAN cathode exhibits a 3D-interwoven nanofiber architecture facilitating efficient charge-carrier migration.
  • Optimized ion/electron transport dynamics significantly reduce interfacial resistance and enhance redox kinetics.
  • Achieved a high reversible specific capacity of 1467.2 mAh g-1 at 0.2 C.
  • Demonstrated a stable discharge capacity of ≈500 mAh g-1 at 2 C, a fivefold improvement over GSPAN.

Conclusions:

  • The nanofibrous architecture of FSPAN effectively overcomes the kinetic limitations of conventional SPAN cathodes in ASSLSBs.
  • Spatially synergistic optimization of charge transport pathways is a viable strategy for enhancing ASSLSB performance.
  • The developed FSPAN cathode represents a significant advancement for high-performance all-solid-state lithium-sulfur batteries.