Enhancing Li-ion conduction in composite polymer electrolytes using Li_0.33La_0.56TiO₃ nanotubes

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Solid-state batteries require advanced electrolytes for improved safety and energy density.
• Polymer electrolytes offer flexibility but often suffer from low ionic conductivity.
• Interface engineering is crucial for enhancing ion transport in composite polymer electrolytes.

Purpose of the Study:

• To develop a novel composite polymer electrolyte (CPE) with enhanced lithium-ion (Li-ion) conductivity.
• To investigate the effect of lithium lanthanum titanium oxide (LLTO) nanotube fillers on CPE performance.
• To evaluate the suitability of the developed CPE for all-solid-state batteries.

Main Methods:

• Synthesis of poly(vinylidene fluoride) (PVDF)-based CPEs incorporating LLTO nanotube fillers.
• Characterization of Li-ion conductivity and interfacial properties.
• Electrochemical testing of Li plating/stripping and Li|CPE|LiFePO4 cells.

Main Results:

• LLTO nanotube fillers significantly increased the interfacial area between PVDF and LLTO, facilitating Li-ion transport.
• The CPE exhibited improved Li plating and stripping cycling performance (205 h at 0.1 mA cm⁻²).
• Li|CPE|LiFePO4 cells demonstrated a discharge capacity of 120 mA h g⁻¹ after 100 cycles at 0.5C at room temperature.

Conclusions:

• The unique LLTO nanotube structure effectively enhances Li-ion conduction in PVDF-based CPEs.
• The developed CPE shows promising performance for all-solid-state battery applications.
• Interfacial engineering using nanotube fillers is a viable strategy for designing high-performance solid-state electrolytes.