Laser-assisted mask-free patterning strategy for high-performance hybrid micro-supercapacitors with 3D current collectors

Planar micro-supercapacitors (MSCs) as a promising energy storage device have been widely used in portable, wearable, and implantable electronics. However, the energy density is still limited by the plane configuration and relatively low loading of electrode active material. Here, we reported a facile approach to fabricate the inter-digitated current collectors architecture by direct laser engraving of nickel (Ni) foams, followed by electrode-position of pseudocapacitive materials for fabricating all-solid-state 3D MSCs devices. The fabricated hybrid AMSC (Ni foam-MnO2//Ni foam-PPy) presented a large areal capacitance of 59.29 mF/cm(2) at 1 V/s and excellent capacity retention of 95.6% after 10,000 cycles. Moreover, the hybrid Ni foam-based AMSC exhibited a high areal energy density range from 42.99 to 77.94 mu Wh/cm(2) with a corresponding power density range from 0.272 to 6.818 mW/cm(2). This prototype of laser-assisted all-solid-state AMSC demonstrates the potential of Ni foam-based energy storage devices applications for 3D MSCs that require high energy density.

Automated summary

This study presents a facile approach to fabricating all-solid-state 3D MSCs devices using laser-engraved nickel foams as inter-digitated current collectors and electrode-positioning pseudocapacitive materials. The hybrid AMSC (Ni foam-MnO2//Ni foam-PPy) exhibits a large areal capacitance, excellent capacity retention, and high energy/power density.