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Scalable Manufacturing of Hybrid Solid Electrolytes with Interface Control.
Marm B Dixit, Wahid Zaman, Yousuf Bootwala1
1George W. Woodruff School of Mechanical Engineering , Georgia Institute of Technology , Atlanta , Georgia 30313 , United States.
ACS Applied Materials & Interfaces
|November 6, 2019
Summary
This study introduces a new coextrusion method for manufacturing hybrid solid electrolytes for lithium batteries. This scalable technique enables tailored ion transport pathways, enhancing battery performance and safety.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Hybrid solid electrolytes are crucial for developing high energy density lithium batteries.
- Controlling ion transport in solid-state devices is key to improving lithium stripping and deposition.
- Scalable manufacturing methods are needed for advanced multi-material electrolytes.
Purpose of the Study:
- To demonstrate a novel roll-to-roll compatible coextrusion device for manufacturing hybrid solid electrolytes.
- To investigate mesostructural control during the manufacturing of PEO-LLZO electrolytes.
- To analyze the impact of compositional gradients on ion conductivity.
Main Methods:
- Utilized a coextrusion device to create multi-material solid electrolyte films in a single pass.
- Investigated electrolytes with 25 wt % and 75 wt % PEO-LLZO compositions.
- Employed distribution of relaxation times and effective mean field theory calculations, alongside computational simulations.
Main Results:
- Successfully processed multi-material films with controlled compositional gradients.
- Achieved an average manufacturing thickness variability of 5.75 ± 1.2 μm.
- Coextruded membranes exhibited higher room temperature conductivity (8.8 × 10-6 S cm-1) than single-material films.
Conclusions:
- The coextrusion method enables scalable manufacturing of hybrid solid electrolytes with tailored structures.
- The interface between PEO and LLZO materials significantly contributes to ion transport properties.
- Computational simulations confirm the influence of macroscale interfaces on ion conductivity in these advanced electrolytes.
