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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Structure of liquid PEO-LiTFSI electrolyte

Mao¹, Saboungi, Price

¹Argonne National Laboratory, Argonne, Illinois 60439, USA.

Physical Review Letters

|September 16, 2000

Summary

This summary is machine-generated.

The polymer electrolyte P(EO)7.5LiN(SO 2CF (3))(2) features lithium ions bonded to ether oxygens in PEO coils. This ordered structure creates pathways for ion conduction, enabling independent anion and cation movement.

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Published on: December 20, 2016

Area of Science:

Polymer science
Solid-state chemistry
Materials science

Background:

Polymer electrolytes are crucial for advanced battery technologies.
Understanding the nanoscale structure of polymer electrolytes is key to optimizing ion transport.
Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is a common salt used in polymer electrolytes.

Purpose of the Study:

To elucidate the detailed structure of the polymer electrolyte P(EO)7.5LiN(SO 2CF (3))(2).
To investigate the coordination environment of lithium ions within the polymer matrix.
To correlate the observed structure with ion conduction mechanisms.

Main Methods:

Neutron diffraction with isotropic substitution was employed to determine the structure.
Analysis focused on the arrangement of polymer chains and the coordination of lithium ions.
Interionic distances were analyzed to assess ion pairing.

Main Results:

Lithium ions are coordinated by an average of five ether oxygens from PEO coils.
The PEO coils exhibit extended-range order, forming well-defined pathways for ion conduction.
No significant ion pairing was observed below 4.8 Å, indicating free ion migration.

Conclusions:

The ordered structure of P(EO)7.5LiN(SO 2CF (3))(2) facilitates efficient lithium ion transport.
The absence of ion pairing suggests high ionic conductivity, similar to other high-performance polymer electrolytes.
This structural insight is valuable for designing next-generation solid-state electrolytes.