High capacity and stable all-solid-state Li ion battery using SnO₂-embedded nanoporous carbon

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• High-performance all-solid-state lithium-ion batteries are pursued for enhanced safety, stability, and capacity.
• Conventional methods struggle with high-capacity materials like tin oxide (SnO2) due to significant volume changes during cycling.
• This volume change compromises electrode integrity and battery performance in traditional solid-state battery designs.

Purpose of the Study:

• To investigate tin oxide (SnO2)-embedded nanoporous carbons as a stable anode material for all-solid-state batteries.
• To address the challenge of volume expansion in high-capacity anode materials.
• To evaluate the performance of a full cell utilizing this novel anode.

Main Methods:

• Fabrication of tin oxide (SnO2) nanoparticles embedded within a nanoporous carbon structure.
• Utilizing the nanoporous carbon to confine volume changes of SnO2 during electrochemical cycling.
• Assembly and testing of a prototype all-solid-state full cell with a LiNi1/3Co1/3Mn1/3O2 cathode.

Main Results:

• The SnO2-embedded nanoporous carbon anode demonstrated effective confinement of volume changes within the nanopores.
• This approach maintained electrode integrity and enabled stable cycling for the high-capacity SnO2 material.
• The prototype full cell achieved a specific energy of 2040 Wh/kg (based on anode weight).

Conclusions:

• SnO2-embedded nanoporous carbons are a promising anode material for stable and high-capacity all-solid-state batteries.
• Confining volume reactions within nanopores is an effective strategy for managing materials with large volume changes.
• This technology offers a pathway towards next-generation solid-state energy storage solutions.