AI Insight
Researchers developed millimeter-thick microsupercapacitors that maintain high energy and power densities as thickness increases, overcoming a key limitation in energy storage devices. By creating a multilayer "electron highway" architecture with vertically aligned carbon nanotubes and graphene layers, the devices achieve linear scaling of performance with thickness rather than the typical degradation. The thickest devices (1.3 mm) demonstrated energy densities of 1.4 Wh/cm³ and power densities of 0.7 W/cm³.
Why it matters
This advancement could enable more compact, higher-capacity energy storage for portable electronics, electric vehicles, and renewable energy systems. The ability to increase device thickness while maintaining performance efficiency allows for greater design flexibility and energy storage capacity in space-constrained applications.
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