Dense All-Electrochem-Active Electrodes for All-Solid-State Lithium Batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Conventional lithium-ion batteries have limited energy density due to inactive electrode components like electrolytes, binders, and carbon additives.
• These inactive materials reduce the utilization of gravimetric and volumetric energy density at the electrode level, below 84 wt% and 62 vol% respectively.
• Optimizing energy density is crucial for advancing battery technology.

Purpose of the Study:

• To propose a dense "all-electrochem-active" (AEA) electrode design for all-solid-state lithium batteries.
• To minimize the gap between accessible and theoretical energy density at the electrode level.
• To enhance the energy storage capabilities of lithium batteries.

Main Methods:

• Fabrication of a dense AEA electrode entirely from mixed electronic-ionic-conducting cathodes.
• Development of a hybrid sulfur (S)-based AEA electrode.
• Characterization of the electrode's compacted filling rate and energy density.

Main Results:

• The AEA electrode design eliminates non-electrochemical active parts, maximizing energy density.
• The self-supported ionic-electronic-conductive network within the AEA cathode enables a high compacted filling rate of 91.8%.
• The hybrid sulfur-based AEA electrode achieved high energy densities of 777 W h kg⁻¹ and 1945 W h L⁻¹ at the electrode level at 70 °C.

Conclusions:

• The AEA electrode represents a significant advancement in maximizing energy density for all-solid-state lithium batteries.
• This approach overcomes the limitations of conventional electrodes by utilizing only electrochemically active materials.
• The high energy densities achieved demonstrate the potential of AEA electrodes for next-generation energy storage solutions.