Integrated solid electrolyte with porous cathode by facilely one-step sintering for an all-solid-state Li-O₂ battery.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• All-solid-state lithium-oxygen (Li-O₂) batteries offer a safer alternative to liquid electrolyte systems.
• Challenges include limited cathode reaction sites and complex fabrication for good interfacial contact.

Purpose of the Study:

• To develop an integrated solid electrolyte cathode assembly (SECA) for improved Li-O₂ battery performance.
• To address limitations of traditional sandwiched battery structures and complex sintering processes.

Main Methods:

• Fabrication of a SECA using a dense Li_1.5Al_0.5Ge_1.5P₃O₁₂ (LAGP) layer and a carbon-coated porous LAGP layer.
• One-step sintering process for facile fabrication.
• Testing of Li-O₂ batteries utilizing the SECA.

Main Results:

• Achieved a discharge capacity of 0.48 mAh cm^-2 at 5 μA cm^-2.
• Sustained six full cycles with a capacity of 0.08 mAh cm^-2 at 10 μA cm^-2.
• High capacity attributed to the increased surface area of the porous cathode structure.

Conclusions:

• The developed SECA effectively enhances Li-O₂ battery performance.
• The facile one-step sintering process simplifies fabrication.
• The porous cathode structure is key to achieving high discharge capacity.