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Amorphous Titanium Polysulfide Composites with Electronic/Ionic Conduction Networks for All-Solid-State Lithium

Wentong Fan1,2, Miao Jiang1,3, Gaozhan Liu1,3

  • 1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.

ACS Applied Materials & Interfaces
|April 7, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel cathode material for all-solid-state lithium batteries using amorphous TiS4 and Super P. This advanced material enhances conductivity and suppresses volume expansion, leading to high-capacity, stable energy storage.

Keywords:
20 percent Super P/a-TiS4@Li7P3S11 compositeall-solid-state lithium batterieselectronic/ionic conduction networkhigh loadinginterfacial contact

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state lithium/sulfide batteries offer high energy density and safety.
  • Sulfide cathodes face challenges with low conductivity and significant volume expansion.
  • Developing stable and efficient solid electrolytes is crucial for next-generation batteries.

Purpose of the Study:

  • To engineer a cathode material that overcomes the limitations of amorphous TiS4 (a-TiS4) in all-solid-state lithium batteries.
  • To enhance electronic conductivity and mitigate volume expansion issues in sulfide cathodes.
  • To create efficient ionic and electronic conduction pathways at the cathode-electrolyte interface.

Main Methods:

  • Incorporation of Super P into amorphous TiS4 (a-TiS4) to form a 20% Super P/a-TiS4 composite.
  • In situ coating of Li7P3S11 solid electrolyte onto the 20% Super P/a-TiS4 surface.
  • Fabrication and electrochemical performance testing of a Li/Li7P3S11/20% Super P/a-TiS4@Li7P3S11 all-solid-state battery.

Main Results:

  • The composite cathode demonstrated suppressed volume expansion and increased electronic conductivity.
  • The in situ coated Li7P3S11 facilitated close interfacial contact, forming favorable ionic conduction paths.
  • The assembled battery achieved a high reversible capacity of 507.4 mAh g-1 after 100 cycles at 0.1 A g-1.
  • Excellent rate capability was observed, with a reversible capacity of 349.8 mAh g-1 after 200 cycles at 1.0 A g-1.

Conclusions:

  • The 20% Super P/a-TiS4@Li7P3S11 composite material effectively addresses key challenges in sulfide cathodes.
  • The integrated electronic and ionic conduction networks are crucial for high-performance all-solid-state lithium batteries.
  • This cathode material represents a promising advancement for safe, high-energy-density solid-state batteries.