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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Closed-Loop Recyclable Solid-State Polymer Electrolytes Enabled by Reversible Lithium Salt Catalysis.

Pei Chen1,2, Shunjie Liu1,2, Hao Zhou1,2

  • 1School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui 230027, China.

Journal of the American Chemical Society
|February 24, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel closed-loop recycling method for solid polymer electrolytes (SPEs) in lithium batteries. The process efficiently recovers key components, paving the way for more sustainable battery technology.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Growing lithium battery production necessitates sustainable end-of-life solutions, particularly for electrolyte recycling.
  • Current battery recycling efforts primarily focus on cathode materials, neglecting valuable electrolyte components.

Purpose of the Study:

  • To develop an innovative closed-loop recycling system for solid polymer electrolytes (SPEs) in lithium batteries.
  • To enable reversible polymerization and depolymerization of SPEs using a catalyst-free approach.

Main Methods:

  • Designed SPEs using reversible catalysis of lithium bis(trifluoromethane) sulfonimide (LiTFSI) for polymerization and depolymerization.
  • Initiated in situ ring-opening polymerization of Li+-activated trimethylene carbonate (TMC) via a hydrogen-bonded adduct.
  • Achieved selective depolymerization of the SPE at 180 °C to recover TMC monomer and LiTFSI.

Main Results:

  • Developed SPEs with ionic conductivity of 1.62 × 10-3 S cm-1 at room temperature and high-voltage stability (up to 4.7 V).
  • Demonstrated robust cycling performance in Li||NCM811 batteries, retaining 88% capacity after 100 cycles.
  • Successfully recovered >90% TMC monomer and >98% LiTFSI via catalyst-free depolymerization.

Conclusions:

  • This work presents a significant advancement in closed-loop recyclable SPEs for sustainable lithium battery technology.
  • The proposed method offers efficient recovery of electrolyte components, reducing waste and environmental impact.