A study on Li_0.33La_0.55TiO₃ solid electrolyte with high ionic conductivity and its application in flexible...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Flexible all-solid-state batteries offer enhanced safety and portability for wearable devices.
• Improving ionic conductivity of solid-state electrolytes is crucial for battery performance.
• Electrode volume changes during cycling lead to battery failure.

Purpose of the Study:

• To prepare and characterize lithium lanthanum titanium oxide (LLTO) solid-state electrolytes.
• To investigate the impact of heat treatment on LLTO ionic conductivity.
• To develop stable and high-performance flexible solid-state batteries for energy storage applications.

Main Methods:

• Magnetron sputtering was used to prepare crystallized and amorphous LLTO electrolytes.
• Heat treatment was applied to optimize LLTO ionic conductivity.
• LiNi0.5Co0.3Mn0.2O2 (NCM) cathodes and Li4Ti5O12 (LTO) anodes were employed due to their low volume change rates.

Main Results:

• The LLTO electrolyte achieved a maximum ionic conductivity of 9.44 × 10-5 S cm-1 at 140 °C.
• A single-layer NCM/LLTO/LTO battery exhibited an output voltage of 2-2.4 V, while a two-layer configuration reached 4.8 V.
• The battery demonstrated excellent cycle stability, retaining 89.2% of its initial capacity after 500 cycles and bending.

Conclusions:

• Optimized LLTO electrolytes enhance the performance of flexible solid-state batteries.
• The use of low-volume-change electrodes (NCM and LTO) significantly improves cycle life.
• These flexible batteries show promise for next-generation wearable energy storage solutions.