A dual‐ion battery‐supercapacitor hybrid device (DIB‐SCHD), cleverly integrating a dual‐ion battery (DIB) and a supercapacitor (SC), is expected to endow both the high energy density of dual‐ion battery and the high power density of supercapacitor. Benefitting from the similar features of the electrolyte and symmetrical electrode configuration, a state‐of‐the‐art DIB‐SCHD is developed by using N‐doped micropores‐dominant carbon(N‐MPC) as the electrode and LiCl in a room‐temperature ion liquid hybrid as the electrolyte, which deliver an ultrahigh mass capacitance of 374 F g−1 with a high voltage of 3.5 V and a remarkable specific energy of 208 Wh kg−1 at 1144 W kg−1 and an ultrahigh specific power of 22834 W kg−1 at 77 Wh kg−1. Combined with ex situ characterizations and theoretical calculations, the assembled DIB‐SCHD presents a synergistic energy storage mechanism simultaneously involving ion intercalation/deintercalation and adsorption/desorption processes, which can promote the reaction kinetics and achieve exceptional electrochemical performance. The perfect integration of the dual‐ion battery‐type and supercapacitor‐type electrodes provides a new strategy toward high energy and power density electrochemical energy storage devices.

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The popularity of portable and wearable electronic equipment increases the demand for rapid, low-cost, and scalable production of microsupercapacitors (MSCs). However, the synthesis of two-dimensional materials and the fabrication of the reported MSCs are considerably time-consuming and intricate processes. Herein, we developed the low-cost and scalable fabrication of biomassbased planar MSCs with desirable flexibility, shape diversity, and tailorable voltage and capacitance output. The prepared N,S-doped carbon (KNSC) possesses a tunable specific surface area of 1323−2116 m 2 •g −1 , hierarchical porous structure, and superior conductivity and delivers a high specific capacitance of 481 F•g −1 . On the basis of the KNSC ink and screen-printing technique, we can also facilely extend this to construction of hundreds and thousands of MSCs connected in a serial and parallel fashion on a target substrate. As a proof of concept, the resulting stripes integrated MSCs with a complex connection fashion of 11 cells in series and 3 cells in a parallel pattern presented a record voltage output of 8.8 V and exceptional areal capacitance of 102.7 mF•cm −2 , which can efficiently light up a white light-emitting diode.