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Anja Bielefeld1,2, Dominik A Weber2, Jürgen Janek1,3

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Solid-state batteries offer advantages but require careful electrode design. Even small amounts of polymeric binder significantly hinder ion transport and reduce performance in composite electrodes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Solid-state batteries are crucial for future mobility, offering high energy density and power.
  • Incorporating polymeric binders in composite electrodes is necessary for cost-effective, large-scale production.
  • Binder content presents a trade-off between mechanical stability and electrochemical performance.

Purpose of the Study:

  • To investigate the impact of cathode design and binder content on solid-state battery performance.
  • To establish a link between microstructure and electrode properties, focusing on lithium-ion transport.
  • To evaluate the influence of active material particle size and void space on ionic conductivity.

Main Methods:

  • Utilized three-dimensional microstructure models of active material, solid electrolyte, and binder.
  • Employed flux-based simulations to evaluate effective ionic conductivity and tortuosity.
  • Simulated ion transport in four-phase composites and estimated limiting current densities.

Main Results:

  • Binder content, even in small quantities, strongly negatively affects ion transport pathways and active surface area.
  • Electrode composition, active material particle size, void space, and binder content were analyzed for their influence.
  • Microstructure-level design parameters directly impact electrode performance and limiting current densities.

Conclusions:

  • Optimizing binder content and microstructure is critical for enhancing solid-state battery performance.
  • Application-driven cell design must consider microstructural characteristics for efficient lithium-ion transport.
  • Understanding these relationships enables the development of more efficient and powerful solid-state batteries.