SnO₂-Embedded Nanoporous Carbon Electrode with a Reaction-Buffer Space for Stable All-Solid-State Li Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Conventional solid-state batteries require dense electrode-electrolyte interfaces.
• Alloy/conversion materials face challenges due to large volume changes during cycling.
• Mechanical stress in dense interfaces limits performance of active materials.

Purpose of the Study:

• To develop a novel electrode structure for solid-state batteries using SnO2.
• To investigate the role of porous carbon in accommodating volume expansion.
• To optimize electrode parameters for high capacity and cyclability.

Main Methods:

• Fabrication of SnO2-embedded porous carbon electrodes.
• Investigation of structural parameters and electrochemical performance.
• Analysis of lithium-ion conduction pathways within the carbon nanopores.

Main Results:

• SnO2-embedded porous carbon electrodes exhibit high capacity (1023 mAh/g-SnO2) and cyclability.
• Nanopores effectively buffer volume changes during SnO2-Sn conversion and alloying reactions.
• Performance at room temperature surpasses that of organic liquid electrolyte systems.

Conclusions:

• Porous carbon structures provide essential buffer space for high-volume-change materials in solid-state batteries.
• Optimized SnO2 loading (75 wt%) in carbon nanopores leads to superior electrochemical performance.
• This approach offers a promising alternative for developing advanced solid-state batteries.