Picosecond ultraviolet laser patterned in-plane asymmetric micro-supercapacitors with high-precision capacity matching

Extensive exploratory research on in-plane asymmetric micro-supercapacitors (AMSCs) involves developing various fabrication techniques for in-plane electrodes to streamline the manufacturing process and expanding the operating voltage window (OVW) to increase energy density. Herein, we prepare MXene (Ti3C2Tx) and laserinduced graphene (LIG) electrodes using picosecond ultraviolet laser etching and laser direct writing, respectively, to construct in-plane MXene//LIG AMSCs. The high precision of laser technology guarantees the preparation of in-plane asymmetric electrodes with an interelectrode spacing of 100 mu m. Additionally, we adjust the electrode width ratio of the positive and negative electrodes to attain high-precision capacity matching. This capacity matching method not only broadens OVW to 1.2 V, but also increases the energy density up to 1.9 times. The picosecond laser patterning construction approach and the capacity matching method in this work provide new perspectives for in-plane asymmetric supercapacitors.