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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Addressing the Interface Issues in All-Solid-State Bulk-Type Lithium Ion Battery via an All-Composite Approach.

Ru-Jun Chen1, Yi-Bo Zhang1, Ting Liu1

  • 1School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University , Beijing 100084, China.

ACS Applied Materials & Interfaces
|March 1, 2017
PubMed
Summary

This study presents a novel all-composite approach for flexible all-solid-state lithium ion batteries (LIBs). This method enhances specific capacity and improves performance under demanding conditions, addressing key limitations in current battery technology.

Keywords:
Li7La3Zr2O12,PEObulk-type all-solid-state batterycompositelithium ion batterysolid-state electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Conventional lithium ion batteries (LIBs) pose safety risks due to flammable liquid electrolytes.
  • All-solid-state LIBs offer enhanced safety but face challenges like low active material loading and high interface resistance.
  • These limitations result in poor rate and cyclic performance in bulk-type solid-state LIBs.

Purpose of the Study:

  • To develop a synergistic all-composite approach for fabricating flexible all-solid-state LIBs.
  • To overcome the limitations of low specific surface capacity and high interface resistance in bulk-type solid-state LIBs.
  • To demonstrate a fabrication method for monolithic, high-performance solid-state LIBs.

Main Methods:

  • Fabrication of thick PEO-based composite cathode layers (LiFePO4 particles) and composite electrolyte layers (Al-LLZTO particles).
  • Layer-by-layer stacking of composite cathode, composite electrolyte, and lithium foil negative layers.
  • Hot-pressing the stacked layers to form a monolithic, flexible all-solid-state LIB.

Main Results:

  • Achieved a high specific discharge capacity of 155 mAh/g and an ultrahigh surface capacity of 10.8 mAh/cm².
  • Demonstrated excellent capacity retention over at least 10 cycles.
  • Confirmed proper functionality under harsh conditions, including bending and sectioning.

Conclusions:

  • The all-composite approach effectively improves both mesoscopic and microscopic interfaces within the solid-state LIB.
  • This method offers a promising new strategy for the design and fabrication of advanced all-solid-state LIBs.
  • The developed flexible LIBs show potential for safer and more robust energy storage solutions.