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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Grain Boundary Electronic Insulation for High-Performance All-Solid-State Lithium Batteries.

Xiaofei Yang1, Xuejie Gao1,2, Ming Jiang3

  • 1Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, N6A 5B9, Canada.

Angewandte Chemie (International Ed. in English)
|November 29, 2022
PubMed
Summary

Researchers developed a grain-boundary electronic insulation strategy to improve all-solid-state lithium batteries. This method enhances cycling life and reduces self-discharge in sulfide electrolytes by blocking electron transport.

Keywords:
All-Solid-State Lithium BatteriesGrain BoundariesHumidity StabilityLithium DendriteSelf-Discharging

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Sulfide electrolytes are crucial for all-solid-state lithium batteries due to high ionic conductivity.
  • Non-negligible electronic conductivity in sulfides causes lithium dendrite formation and self-discharge.

Purpose of the Study:

  • To propose a grain-boundary electronic insulation (GBEI) strategy to mitigate electronic conductivity issues in sulfide electrolytes.
  • To enhance the performance and stability of all-solid-state lithium batteries.

Main Methods:

  • Development and application of a GBEI strategy to block electron transport across grain boundaries in sulfide electrolytes.
  • Fabrication and testing of lithium-lithium symmetric cells and lithium-lithium cobalt oxide full cells.

Main Results:

  • GBEI strategy significantly extended cycling life of Li-Li symmetric cells (30x longer).
  • Reduced self-discharge rate by three times in Li-LiCoO2 full cells compared to pristine electrolytes.
  • Achieved 80% capacity retention over 650 cycles and stable cycling for over 2600 cycles at 0.5 mA/cm² in Li-LiCoO2 ASSLBs.

Conclusions:

  • The GBEI strategy effectively suppresses electron transport, improving ASSLB performance.
  • Tailoring electronic conductivity at grain boundaries offers a novel approach for high-performance ASSLBs.
  • This work paves the way for more stable and efficient solid-state battery technologies.