Solid Polymer Electrolytes with Enhanced Electrochemical Stability for High-Capacity Aluminum Batteries

Oi Man Leung, Leo W. Gordon, Robert J. Messinger, Themis Prodromakis, Julian A. Wharton, Carlos Ponce de León, Theresa Schoetz

Research output: Contribution to journalArticlepeer-review


Chloroaluminate ionic liquids are commonly used electrolytes in rechargeable aluminum batteries due to their ability to reversibly electrodeposit aluminum at room temperature. Progress in aluminum batteries is currently hindered by the limited electrochemical stability, corrosivity, and moisture sensitivity of these ionic liquids. Here, a solid polymer electrolyte based on 1-ethyl-3-methylimidazolium chloride-aluminum chloride, polyethylene oxide, and fumed silica is developed, exhibiting increased electrochemical stability over the ionic liquid while maintaining a high ionic conductivity of ≈13 mS cm−1. In aluminum–graphite cells, the solid polymer electrolytes enable charging to 2.8 V, achieving a maximum specific capacity of 194 mA h g−1 at 66 mA g−1. Long-term cycling at 2.7 V showed a reversible capacity of 123 mA h g−1 at 360 mA g−1 and 98.4% coulombic efficiency after 1000 cycles. Solid-state nuclear magnetic resonance spectroscopy measurements reveal the formation of five-coordinate aluminum species that crosslink the polymer network to enable a high ionic liquid loading in the solid electrolyte. This study provides new insights into the molecular-level design and understanding of polymer electrolytes for high-capacity aluminum batteries with extended potential limits.

Original languageEnglish (US)
Article number2303285
JournalAdvanced Energy Materials
Issue number8
StatePublished - Feb 23 2024


  • aluminum–graphite batteries
  • chloroaluminate ionic liquids
  • fast-charging
  • nuclear magnetic resonance spectroscopy
  • solid polymer electrolytes

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science


Dive into the research topics of 'Solid Polymer Electrolytes with Enhanced Electrochemical Stability for High-Capacity Aluminum Batteries'. Together they form a unique fingerprint.

Cite this