Low Temperature Fast-Charging Li Ion Batteries Enabled by f-Orbital Hybridization Induced TiNb₂O₇ Electronic...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-ion batteries (LIBs) are crucial for electric vehicles and aviation, demanding fast charging, extended cycle life, and broad operating temperatures.
• Current anode materials struggle to provide high capacity and stability under rapid charge/discharge rates, hindering LIB advancement.

Purpose of the Study:

• To engineer novel anode materials that overcome the limitations of existing LIB anodes.
• To enhance ion transport kinetics and electrochemical stability through the strategic incorporation of lanthanide elements.

Main Methods:

• Synthesized a novel anode material, Tm$_{0.01}$-TNO, incorporating lanthanide elements with f-orbital configurations.
• Utilized X-ray absorption spectroscopy to analyze the structural and electronic properties of the modified anode.
• Conducted electrochemical performance testing under various temperature conditions, including low temperatures (-30 °C).

Main Results:

• The introduction of lanthanide elements widened ion transport channels and modified electronic structure, accelerating kinetics.
• Tm$_{0.01}$-TNO demonstrated a high specific capacity of 150.9 mAh g$^{-1}$ at 50 °C.
• Achieved excellent low-temperature performance with 100% capacity retention over 500 cycles at 1 °C, even at -30 °C.

Conclusions:

• Lanthanide incorporation offers a promising strategy to enhance LIB anode performance, particularly for high-rate and low-temperature applications.
• The developed Tm$_{0.01}$-TNO material shows significant potential for scalable use in demanding environments like electric vehicles and aviation.
• This research paves the way for next-generation LIBs with improved energy density and operational stability across wide temperature ranges.