Unified Platform for Ion Transport in Inorganic Glasses, Polymers and Composite Solid Electrolytes

Conductivity of composites is governed by the ratio of the morphology factor, f, and tortuosity, τ. Theoretical predictions for composites as a function of morphology and the conducting phase volume fraction, fc, are shown.

Scientific Achievement

In this review paper, ion transport parameters  in seemingly different solid electrolytes – glasses, polymers, and composites  – were presented on a unified platform.

Significance and Impact

The performance of all-solid batteries is limited by ion transport parameters in the electrolyte. The work covers both soft polymers and hard inorganic materials.  Ion transport through composites depends on morphology. The simplest systems are predicted to follow the curve shown in the figure.

Research Details

  • A new dimensionless number (Ne) is presented for quantifying the efficacy of all electrolytes.
  • Block copolymer composites with one conducting domain is examined with the consideration of morphology factor and tortuosity.
  • The mismatch in transference numbers in composites of polymers and inorganic composite electrolyte is shown to be an important transport bottleneck.
  • In addition to bulk transport, factors that affect the electrochemical reactions between solid electrolytes and electrodes are addressed.

DOI: 10.1557/mrs.2018.212

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