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Summary

This study introduces a novel composite electrolyte for solid-state batteries using gradient Li₂TiO₃/Li₄Ti₅O₁₂ (LTO) fillers. This design enhances ionic conductivity and effectively suppresses lithium dendrite growth for safer, high-performance batteries.

Keywords:
built‐in electric fieldgradient‐heterojunctionsolid‐state lithium batteriesstable cathode/anode interface

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Solid-state batteries (SSBs) offer high energy density and safety but are limited by low ionic conductivity and lithium dendrite formation in polymer electrolytes.
  • Lithium metal anodes in SSBs require stable interfaces to prevent dendrite growth and ensure long cycle life.

Purpose of the Study:

  • To develop a composite electrolyte with enhanced ionic conductivity and dendrite suppression capabilities for solid-state batteries.
  • To investigate the effect of gradient Li₂TiO₃/Li₄Ti₅O₁₂ (LTO) heterojunction fillers on ionic transport and interfacial stability.

Main Methods:

  • Fabrication of a composite electrolyte incorporating gradient Li₂TiO₃/Li₄Ti₅O₁₂ (LTO) heterojunction fillers.
  • Characterization of ionic conductivity and electrochemical performance of the composite electrolyte in symmetric Li||Li cells and full SSBs.
  • Analysis of the built-in electric field (IEF) generation and particle redistribution within the gradient structure.

Main Results:

  • Achieved an ionic conductivity of 0.83 mS cm⁻¹ at room temperature due to enhanced Li salt dissociation and continuous ion pathways facilitated by the LTO heterojunction.
  • Demonstrated stable cycling of symmetric Li||Li cells for over 1000 hours at 1 mA cm⁻² by effectively blocking dendrite propagation through gradient IEF and reinforced mechanical strength.
  • Achieved 94.6% capacity retention after 5000 cycles at 5C in SSBs, showcasing excellent long-term performance.

Conclusions:

  • Gradient IEF engineering using LTO heterojunction fillers is a viable strategy for simultaneously improving ionic conductivity and interfacial stability in SSBs.
  • The developed composite electrolyte enables fast-charging, dendrite-free solid-state batteries with enhanced safety and long-term cycling performance.