Advanced Nanoclay-Based Nanocomposite Solid Polymer Electrolyte for Lithium Iron Phosphate Batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• High-performance solid polymer electrolytes (SPEs) are crucial for advanced lithium batteries.
• Nanostructured fillers can improve SPE properties, but are often expensive and complex to produce.
• Halloysite nanotubes (HNTs) offer a low-cost alternative with desirable geometric features.

Purpose of the Study:

• To overcome the poor performance of HNT/SPEs in lithium iron phosphate (LFP) batteries.
• To enhance the compatibility between LFP electrodes and SPEs.
• To develop a modified HNT/SPE for improved all-solid-state LFP battery performance.

Main Methods:

• Incorporation of a minor addition of LFP during the preparation of HNT/SPE composite.
• Characterization of ionic conductivity, electrochemical stability window, and lithium-ion transference number.
• Fabrication and testing of all-solid-state LFP batteries using the modified electrolyte.

Main Results:

• Achieved good ionic conductivity (9.23 × 10^-5 S cm^-1 at 25 °C).
• Enhanced compatibility between LFP electrodes and the electrolyte.
• Demonstrated an electrochemical stability window of 5.14 V and a lithium-ion transference number of 0.46.
• All-solid-state LFP batteries exhibited excellent cycling performance.

Conclusions:

• A simple modification of HNT/SPE by adding LFP significantly improves its suitability for LFP batteries.
• This cost-effective approach enables high-performance all-solid-state lithium batteries.
• The modified HNT/SPE offers a promising solution for next-generation energy storage.