Novel LiAlO₂ Material for Scalable and Facile Lithium Recovery Using Electrochemical Ion Pumping

Area of Science:

• Materials Science
• Electrochemistry
• Environmental Science

Background:

• Lithium recovery from aqueous resources is crucial for sustainable energy.
• Developing efficient and cost-effective electrode materials is essential for lithium extraction.

Purpose of the Study:

• To investigate alpha-lithium aluminate (α-LiAlO₂) as a novel positive electrode material for lithium recovery.
• To evaluate the synthesis, electrochemical properties, and Li⁺ capture performance of α-LiAlO₂.

Main Methods:

• Hydrothermal synthesis and air annealing for material fabrication.
• Electrochemical activation to form Li⁺-intercalating sites (AlO₂*).
• Testing selective Li⁺ capture in various aqueous solutions.

Main Results:

• Successfully synthesized α-LiAlO₂ phase using low-cost, low-energy methods.
• Electrochemical activation created AlO₂* sites capable of intercalating Li⁺.
• Achieved selective Li⁺ capture between 100 mM and 25 mM concentrations, with an adsorption capacity of 8.25 mg g⁻¹ in 25 mM LiCl.
• Demonstrated performance in complex solutions like reverse osmosis brine.

Conclusions:

• α-LiAlO₂ is a viable and selective electrode material for lithium recovery from aqueous resources.
• The developed synthesis and activation methods are cost-effective and energy-efficient.
• This approach shows potential for practical lithium extraction from diverse water sources.