Textile Inspired Lithium-Oxygen Battery Cathode with Decoupled Oxygen and Electrolyte Pathways

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-air (Li-O₂) batteries offer ultrahigh energy density, making them promising for next-generation energy storage.
• Conventional porous carbon cathodes suffer from performance limitations due to competing transport pathways for oxygen and electrolyte.
• Efficient management of multi-phase reactions is crucial for advanced electrochemical devices.

Purpose of the Study:

• To develop a novel textile-based air cathode for lithium-air (Li-O₂) batteries.
• To address the challenge of competing transport pathways in conventional Li-O₂ battery cathodes.
• To enhance the overall performance and stability of Li-O₂ batteries through a unique structural design.

Main Methods:

• Fabrication of a novel textile-based air cathode with a hierarchical, conductive textile network.
• Implementation of a triple-phase structure to create decoupled transport pathways for oxygen gas and electrolyte.
• Characterization of the textile-based cathode's electrochemical performance, including discharge capacity and overpotential.

Main Results:

• The textile-based cathode demonstrated decoupled transport pathways, allowing oxygen flow through the mesh and electrolyte diffusion along fibers.
• Achieved a high discharge capacity of 8.6 mAh cm^-2 and a low overpotential of 1.15 V.
• Exhibited stable operation for over 50 cycles, indicating improved durability and performance.

Conclusions:

• The novel textile-based air cathode design effectively overcomes the limitations of conventional cathodes by enabling noncompetitive transport.
• This approach significantly enhances the performance and stability of lithium-air (Li-O₂) batteries.
• The textile-based structure shows potential for flexible/wearable Li-O₂ batteries and other multi-phase reaction applications like fuel cells and water splitting.