One-Step In Situ Polymerization: A Facile Design Strategy for Block Copolymer Electrolytes

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Optimizing lithium-ion transport is crucial for high-performance lithium metal batteries (LMBs).
• Block copolymer electrolytes (BCPEs) offer tunable properties for advanced battery applications.
• In situ fabrication methods can improve electrode-electrolyte interfaces.

Purpose of the Study:

• To develop a one-step in situ fabrication method for BCPEs in LMBs.
• To enhance lithium-ion (Li+) transport and interfacial stability.
• To evaluate the electrochemical performance of the fabricated BCPEs.

Main Methods:

• Fabrication of BCPEs via a one-step combination of reversible addition-fragmentation chain transfer (RAFT) polymerization and carboxylic acid-catalyzed ring-opening polymerization (ROP).
• In situ assembly of LMBs with the synthesized BCPEs.
• Electrochemical characterization, including cycling performance and capacity retention.

Main Results:

• The BCPEs effectively balanced Li+ coordination, enabling rapid Li+ migration.
• The carboxylic acid acted as a catalyst for ROP and stabilized the electrode/electrolyte interface.
• The in situ assembled Li/BCPE4/LFP demonstrated high capacity retention (92%) after 400 cycles at 1C.

Conclusions:

• The one-step in situ fabrication of BCPEs is a viable strategy for optimizing LMBs.
• This method enhances Li+ transport and interfacial stability, leading to improved battery performance.
• The approach provides a new direction for designing advanced polymer electrolytes for energy storage devices.