A High‐Performance Dual‐Ion Battery‐Supercapacitor Hybrid Device Based on LiCl in Ion Liquid Dual‐Salt Electrolyte

Abstract

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.

Calcium Based All‐Organic Dual‐Ion Batteries with Stable Low Temperature Operability

“…The reduced intensities of these peaks in the sample at discharged state could be assigned to the disassociation of ClO 4 − (Figure S11c, Supporting Information). [29,30] In the N 1s spectra of the PTPAn cathode at charged state, a new peak located at 401.78 eV appeared, which ascribed to the formation of N radical cation, [31] which was severely weakened in the discharged state, implying the reduction of N radical cation (Figure S11d, Supporting Information). According to these results, the working mechanism of CAN-ODIB was illustrated in Figure S12 in the Supporting Information.…”

Lignocellulose Biopolymers and Electronically Conducting Polymers: Toward Sustainable Energy Storage Applications

“…Conventional electrolytes used in batteries are liquid in nature, made up of carbonate based organic solvents with high ionic conductivity such as ethylene carbonate, diethyl carbonate, dimethyl carbonate, etc . These electrolytes, despite their success, suffer from several shortcomings such as their reactivity toward electrodes, flammable nature of organic solvents, and the possibility of leakage of the liquid electrolytes .…”

A Chlorine-Based Redox Electrochemical Capacitor

“…16 Not surprisingly, there have been few reports of chlorine oxidation in the field of electrochemical capacitors, although the intercalation behavior of chloride ions has been reported in hybrid devices. 17 This is because the reaction potential of chlorine exceeds the stable voltage window of aqueous electrolytes and the gaseous oxidation products have difficulty achieving reversibility in the liquid phase. 18 From the perspective of the energy-storage mechanism of redox additives in electrolytes, under an applied bias, the redox species in the pores of electrode materials are the most adaptable to the electrosorption process and undergo electron transfer to convert into oxidized/reduced states.…”

“…Chlorine has the highest standard redox potential (1.358 V vs SHE (standard hydrogen electrode)) and lowest molecular weight in the halogen family, except for fluorine, implying its potential to provide high capacity . Not surprisingly, there have been few reports of chlorine oxidation in the field of electrochemical capacitors, although the intercalation behavior of chloride ions has been reported in hybrid devices . This is because the reaction potential of chlorine exceeds the stable voltage window of aqueous electrolytes and the gaseous oxidation products have difficulty achieving reversibility in the liquid phase .…”