3D-Printed Ultra-Thin Solid Polymer Electrolytes with Superior Dielectric Properties for Wide Temperature Range...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• All-solid-state batteries (ASSBs) are crucial for improved safety and performance over conventional lithium-ion batteries.
• Solid polymer electrolytes (SPEs) offer advantages in processability but exhibit low ionic conductivity at room temperature.
• Liquid crystal electrolytes (LCEs) utilize self-assembling mesophases for enhanced ion transport, yet require precise manufacturing for device integration.

Purpose of the Study:

• To engineer a novel 3D-printed, ultra-thin composite LCE membrane for high-performance ASSBs.
• To enhance ionic conductivity and dielectric properties through molecular design and advanced manufacturing.
• To demonstrate the efficacy of the LCE membrane in enabling stable and durable ASSB cycling.

Main Methods:

• Fabrication of a 20 µm composite LCE membrane using 3D printing technology.
• Incorporation of a PVDF polymer matrix, a polymer network from LC monomer RM257 and thiol monomers, and 5CB high-dielectric LC.
• Integration of the LCE membrane into ASSBs with lithium metal anodes and LiCoO2 cathodes for performance evaluation.

Main Results:

• The composite LCE membrane achieved a high dielectric constant (εr' ~ 40) and ionic conductivity (~10⁻³ S cm⁻¹).
• ASSBs utilizing the printed LCE membrane demonstrated exceptional long-term cycling stability, retaining 76.6% capacity after 3000 cycles.
• The study successfully linked molecular design principles with additive manufacturing for superior battery performance.

Conclusions:

• 3D printing of composite LCE membranes is a viable strategy for developing advanced ASSBs.
• The engineered LCE membrane significantly improves ionic conductivity and electrochemical stability.
• This approach offers a pathway to high-performance, durable, and safe solid-state battery technologies.