The Need
Current solid-state batteries (SSBs) offer high energy density and improved safety but require high stack pressures for stable operation, limiting their practicality in electric vehicles and consumer electronics. Silicon anodes, while promising for their high capacity, suffer from rapid degradation due to volume expansion and particle pulverization, especially under low-pressure conditions. There is a critical need for anode materials that maintain performance and stability at commercially viable, low operating pressures.

The Technology
This technology, developed by OSU engineers, introduces a composite anode material comprised of silicon nanoparticles encapsulated within chemically modified graphene oxide. The unique structure leverages graphene’s mechanical strength and conductivity to buffer silicon’s volume changes during cycling, enhancing interfacial stability and reducing impedance growth. When paired with a LiNbO3-coated NMC622 cathode, the full cell demonstrates superior rate performance and cycle life under low stack pressures, outperforming conventional silicon anodes.

Commercial Applications
• Electric vehicle batteries
• Portable consumer electronics
• Grid-scale energy storage systems
• Aerospace and defense applications

Benefits/Advantages
• Operates reliably at low stack pressures
• Extends cycle life and capacity retention
• Reduces mechanical degradation and impedance growth
• Supports fast charge/discharge rates