The methodology, as detailed in a recent article published in the International Journal of Extreme Manufacturing, holds significant promise for advancing the capabilities of future microelectronic devices, especially those utilized in challenging or space-limited environments.
Central to this technology is a straightforward yet highly effective laser process. The research team harnessed the power of a CO₂ laser to convert sheets of commercial polyimide (PI) paper into 3D graphene, a superior material for electricity storage and conduction. This graphene paper serves multiple functions within the device, acting as the energy-storing electrode, electrical connector, and structural support all at once.
“Conventional supercapacitors rely on bulky metal elements and intricate wiring to interconnect multiple cells,” explained Prof. Huilong Liu, the corresponding author of the study and an associate professor at GDUT’s State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment. “Our approach simplifies both the materials and the design process while still achieving exceptional voltage output and stable performance.”
The team conducted a thorough investigation into how various laser parameters—including scan density, power, and speed—affect the structure and conductivity of the graphene material. Through these optimizations, they consistently produced graphene sheets with minimal electrical resistance and robust electrochemical properties.
In this novel design, the hydrogel electrolyte serves a dual purpose as a separator, with the PI paper dictating the shape of each cell. The self-supporting graphene layers allow for tight stacking of all components, resulting in a compact device without compromising performance. Importantly, all TFSCs—from individual cells to a complete 160-cell stack—exhibited uniform performance.
“The primary advantage lies in the elimination of metal current collectors and external connectors,” noted co-author Prof. Yun Chen. “By streamlining the materials and assembly process, we can scale up to achieve high-voltage outputs while maintaining an ultra-compact form factor.”
The team’s future endeavors will focus on enhancing the energy density and voltage range of these devices. Their ultimate goal is to enable this technology to power wearable sensors, flexible electronics, and other small-scale systems requiring dependable energy sources in demanding or space-constrained settings.
