Two-dimensional LiTi₂(PO₄)₃ flakes for enhanced lithium ions battery anode

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-ion batteries (LIBs) are crucial for energy storage.
• Developing high-capacity anode materials is essential for improving LIB performance.
• Existing anode materials face challenges in terms of capacity and cycling stability.

Purpose of the Study:

• To synthesize lamellar lithium titanium phosphate (LTP) flakes using a template method.
• To investigate the electrochemical properties of lamellar LTP as an anode material for LIBs.
• To compare the performance of lamellar LTP with granular LTP for high-capacity applications.

Main Methods:

• Template-assisted synthesis of LiTi2(PO4)3 (LTP) flakes.
• Characterization of the 2D layered structure and active sites of LTP.
• Electrochemical testing, including cyclic voltammetry and galvanostatic charge-discharge cycles.
• Measurement of Li+ diffusion coefficients in lamellar and granular LTP anodes.

Main Results:

• Lamellar LTP exhibits a significantly higher Li+ diffusion coefficient (3.12 × 10^-8 cm^2 s^-1) compared to granular LTP (5.01 × 10^-10 cm^2 s^-1).
• The lamellar LTP anode delivers a high initial discharge capacity of 986.8 mAh·g^-1 at 0.1 A·g^-1.
• Superior cycling stability was observed, with the lamellar LTP anode retaining 231.1 mAh·g^-1 after 100 cycles, outperforming granular LTP.

Conclusions:

• The 2D layered structure of lamellar LTP promotes Li+ diffusion kinetics and increases the electrolyte-electrode contact area.
• Lamellar LTP demonstrates excellent potential as a high-performance anode material for lithium-ion batteries.
• The fast charge-discharge performance and superior cycling stability make lamellar LTP a promising candidate for next-generation energy storage devices.