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Gradiently Polymerized Solid Electrolyte Meets with Micro-/Nanostructured Cathode Array.

Wei Dong1,2, Xian-Xiang Zeng3, Xu-Dong Zhang1,2

  • 1CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education, Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences (CAS) , Beijing 100190 , P. R. China.

ACS Applied Materials & Interfaces
|May 3, 2018
PubMed
Summary

This study introduces an innovative solid Li metal battery design using gradiently polymerized solid electrolyte (GPSE) to reduce interfacial resistance. This design enhances high rate capability and cycle stability for next-generation energy storage.

Keywords:
allied micro-arraycathode designgradient polymerizationinterface modificationsolid-state electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Poor contact between solid-state electrolytes and cathode materials causes high interfacial resistance.
  • This resistance severely limits the rate capability of solid lithium metal batteries.

Purpose of the Study:

  • To introduce an integrative battery design to overcome interfacial resistance in solid Li metal batteries.
  • To improve the rate capability and cycle stability of solid-state batteries.

Main Methods:

  • Developed a gradiently polymerized solid electrolyte (GPSE) integrated with a microchannel current collector array and nanosized cathode particles.
  • Engineered an in situ formed GPSE to encapsulate cathode nanoparticles, reducing interfacial impedance.
  • Designed a GPSE with a stiff surface layer to suppress lithium dendrite growth.

Main Results:

  • Achieved an outstanding high rate response (90.3% capacity retention at 5 C) with a Li-free V2O5-H cathode.
  • Demonstrated ultralow capacity fade rate (0.07% per cycle over 300 cycles).
  • Showcased effective operation of LiFePO4 and LiNi0.5Mn0.3Co0.2O2 cathodes at high rates.

Conclusions:

  • The integrative battery design effectively lowers interfacial impedance and suppresses dendrite growth.
  • This approach significantly enhances the rate capability and long-term stability of solid Li metal batteries.
  • The interfacial engineering strategy offers insights for developing other solid metal batteries.