Topological lithium coordination engineering enables near-complete lithium utilization in O2-type layered cathodes

Area of Science:

• Materials Science
• Electrochemistry
• Battery Technology

Background:

• Layered transition metal oxides are crucial for high-energy-density lithium-ion batteries.
• Achieving high lithium utilization in these cathodes remains a significant challenge.
• Current strategies often compromise structural integrity or cycle life.

Purpose of the Study:

• To develop a new strategy for maximizing active lithium utilization in layered cathodes.
• To enhance the electrochemical performance and reversibility of Li-rich layered oxides.
• To provide a pathway for designing next-generation high-energy-density battery materials.

Main Methods:

• Topological lithium coordination engineering was employed on an O2-Li0.67Ni0.33Mn0.67O2 layered cathode.
• The Li-O coordination environment was reconstructed to stabilize delithiated states.
• Electrochemical performance, including lithium de-intercalation/intercalation, was evaluated.

Main Results:

• Near-complete active lithium utilization (approximately 98%) was achieved.
• The layered transition metal-oxygen framework was preserved.
• A reconstructed Li-O coordination environment effectively stabilized highly delithiated states.
• Highly reversible lithium de-intercalation and intercalation were demonstrated.

Conclusions:

• Topological lithium coordination engineering is a viable strategy for enhancing lithium utilization in layered cathodes.
• The developed cathode material exhibits potential for high-energy-density applications.
• This approach offers a new direction for designing advanced cathode materials for next-generation batteries.