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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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Interface design for all-solid-state lithium batteries.

Hongli Wan1, Zeyi Wang1, Weiran Zhang2

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Summary
This summary is machine-generated.

New interlayers for solid-state lithium-metal batteries prevent lithium dendrite growth and reduce resistance. This enables high energy density and fast charging even at low stack pressures.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-energy all-solid-state lithium-metal batteries face challenges with lithium dendrite growth and high interfacial resistance at low stack pressures.
  • These issues hinder battery performance and safety, limiting their practical application.

Purpose of the Study:

  • To design novel interlayers for lithium anodes and cathodes to overcome the limitations of low stack pressure operation in all-solid-state lithium-metal batteries.
  • To improve the stability and performance of lithium-metal batteries by suppressing dendrite formation and reducing interfacial resistance.

Main Methods:

  • A Mg16Bi84 interlayer was developed for the Li/Li6PS5Cl interface to suppress lithium dendrite growth.
  • A fluorine-rich interlayer was applied to LiNi0.8Mn0.1Co0.1O2 (NMC811) cathodes to reduce interfacial resistance.
  • In-situ structural and chemical analysis during plating-stripping cycles to understand interlayer mechanisms.

Main Results:

  • The Mg16Bi84 interlayer transformed into a multifunctional LiMgSx-Li3Bi-LiMg structure, acting as a solid electrolyte interphase, porous Li3Bi sublayer, and solid binder.
  • The Li3Bi sublayer facilitated uniform lithium deposition and stress amelioration during cycling.
  • The fluorine-rich interlayer stabilized NMC811 cathodes by forming F-doped NMC811, enabling operation at 4.3 V.
  • NMC811/Li6PS5Cl/Li cells achieved 7.2 mAh cm-2 at 2.55 mA cm-2, and LiNiO2/Li6PS5Cl/Li cells reached 11.1 mAh cm-2 with 310 Wh kg-1 energy density at 2.5 MPa stack pressure.

Conclusions:

  • The developed anode and cathode interlayers provide a general strategy for enhancing all-solid-state lithium-metal batteries.
  • This approach enables high energy density and fast charging capabilities under low stack pressure conditions.
  • The study offers a promising solution for the next generation of advanced battery technologies.