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Related Concept Videos

Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
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Analysis of Interfacial Effects in All-Solid-State Batteries with Thiophosphate Solid Electrolytes.

Anton Neumann1,2, Simon Randau3,4, Katharina Becker-Steinberger1,2

  • 1German Aerospace Center (DLR) , Institute of Engineering Thermodynamics , Pfaffenwaldring 38-40 , 70569 Stuttgart , Germany.

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|February 11, 2020
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Summary

All-solid-state batteries (ASSBs) using composite cathodes show good cycle life but limited capacity. Simulations reveal low electronic conductivity in Li(Ni0.6Mn0.2Co0.2)O2 (NMC622) restricts performance.

Keywords:
3D microstructure-resolved simulationsall-solid-state batteriesimpedance analysismicrocomputer tomographynickel-rich layered oxidesthiophosphate solid electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • All-solid-state batteries (ASSBs) are crucial for next-generation safe, high-power energy storage.
  • Composite cathodes offer higher energy density than thin-film ASSBs.
  • β-Li3PS4 (β-LPS) and Li(Ni0.6Mn0.2Co0.2)O2 (NMC622) composites are investigated for enhanced ASSB performance.

Purpose of the Study:

  • Investigate the performance limitations of composite cathodes in ASSBs.
  • Correlate microstructure properties with electrode performance and impedance.
  • Identify key factors affecting cathode utilization and capacity retention.

Main Methods:

  • Fabrication and testing of ASSB cells with β-LPS/NMC622 composite cathodes.
  • 3D microstructure-resolved simulations using X-ray tomography data.
  • Analysis of electrode performance, impedance, and capacity retention.

Main Results:

  • Composite cathodes exhibit satisfactory capacity retention and cycle life.
  • Cathode utilization in ASSBs is lower than in liquid electrolyte systems.
  • Low electronic conductivity of fully lithiated NMC622 is a primary performance bottleneck.
  • Microstructure geometry and morphological changes significantly impact capacity retention at high currents.

Conclusions:

  • The intrinsic electronic conductivity of NMC622 limits cathode utilization in ASSBs.
  • Interface phenomena and microstructural characteristics critically influence ASSB performance.
  • Further research should focus on improving NMC622 conductivity and understanding microstructure-interface interactions for better ASSB design.