Ion regulation of ionic liquid electrolytes for supercapacitors

Feng, Jianze; Wang, Yan; Xu, Yongtai; Sun, Yinglun; Tang, Yu; Yan, Xingbin

doi:10.1039/d0ee04002a

Cited by 91 publications

(53 citation statements)

References 169 publications

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“…Furthermore, the presence of LiCl in EMIMBF 4 can effectively improve intrinsic shortcomings of room‐temperature ionic liquid, that is low conductivity, resulting in high equivalent series resistance, which greatly promoted the maximum usage of power performance of EDLCs. [ 35,36 ] The Nyquist plots (Figure 3c) of EMIMBF 4 , LiCl/EMIMBF 4 and NaCl/EMIMBF 4 , and KCl/EMIMBF 4 well coincided with our conclusion. It was expected that simultaneously increasing the capacitance and conductivity ultimately led to the significant improvement in specific energy and specific power.…”

Section: Resultssupporting

confidence: 87%

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

Xiong

Guo

Yang

et al. 2021

Advanced Energy Materials

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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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Section: Resultssupporting

confidence: 87%

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

Xiong

Guo

Yang

et al. 2021

Advanced Energy Materials

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“…The ionic liquids (ILs) are used for electrolytes because of the inherent features of nonflammability, nontoxicity, and low vapor pressure. [ 115–117 ] Albert organic electrolytes can improve the electrochemical window and electrochemical stability to some extent, low ion conductivity and poor specific capacity limit the practical application limit the practical application. [ 118 ] As a promising candidate to replace the traditional liquid electrolyte, the ILs have a stable electrochemical window, a higher ion conductivity, and excellent compatibility with conventional electrolytes.…”

Section: Organic Electrolytes For Zibsmentioning

confidence: 99%

Recent Advances in Electrolytes for “Beyond Aqueous” Zinc‐Ion Batteries

et al. 2021

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Designing high performance electrolyte is an efficient strategy to circumvent these problems. As one of the most important components, electrolytes provide the basic operating environment to guarantee the transmission of the Zn 2+ between the two electrodes during the charge-discharge processes, affect the Zn 2+ /Zn plating/ stripping on the anode and deciding the electrochemically stable potential windows. [12] Since the utilization of alkaline electrolytes in batteries in earlier studies, Zn|KOH|MnO 2 batteries became a hot topic. [13] However, the using of an alkaline electrolyte always leads to the growth of Zn dendrites and the corrosion of the anode, resulting in rapid capacity fading. [14][15][16] Until 1986, the replacement of corrosive alkaline electrolyte systems by neutral aqueous electrolytes greatly improved the performance and safety of ZIBs. [17] Although the aqueous electrolytes alleviated the corrosion of the Zn electrode in some extent, the problems related to the growth of dendrites and the dissolution of the cathode, especially the limited electrochemical stability window (≈1.23 V) still are the challenge in the application of ZIBs. [18][19][20] The aqueous electrolytes of ZIBs often suffer from the water splitting process, including hydrogen evolution reaction and oxygen evolution reaction. [21][22][23] Therefore, in order to overcome the problems mentioned above, "beyond aqueous" electrolytes for ZIBs have attracted extensive attention in recent years. [24][25][26] At present, the "beyond aqueous" electrolytes for ZIBs have been reported mainly include liquid organic electrolytes and solid electrolytes. Zn anode in the organic electrolytes have high thermodynamic stability, avoiding the appearance of passivation products inevitably generated in traditional aqueous solution, i.e., ZnO and Zn(OH) 4 −2. [27] Solid-state electrolytes have sufficient mechanical strength to inhibit the growth of dendrites. [28] Moreover, the "beyond aqueous" electrolytes without water fundamentally avoid the decomposition of water and the formation of side products related to water. Compared with aqueous electrolytes, the "beyond aqueous" electrolytes exhibit a wide electrochemical stability window (Figure 1) and excellent thermodynamic stability of Zn anode leading to Zn plating/ stripping high reversibility with higher Coulombic efficiencies (CEs). [29] Although significant advances have been made in improving the electrochemical performance of the "beyond aqueous" electrolytes for ZIBs, several severe issues still exist, which largely prevent the development of "beyond aqueous" ZIBs. [30][31][32][33][34][35] The main issues of "beyond aqueous" electrolytes With the growing demands for large-scale energy storage, Zn-ion batteries (ZIBs) with distinct advantages, including resource abundance, low-cost, high-safety, and acceptable energy density, are considered as potential substitutes for Li-ion batteries. Although numerous efforts are devoted to design and develop high performance cathodes and aqueous electrolyt...

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“…Ionic liquids with the advantages of low volatility, high electrochemical stability, wide liquidus range, and considerable ionic conductivity are used as electrolytes for EES devices. [116,117] Some ionic liquids can remain liquid state at subzero temperatures, such as 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF 4 ), which enables the supercapacitor to operate at −20 °C. [118,119] However, as the operating temperature continues to decrease, the viscosity of ionic liquids increases substantially, and ionic liquids are finally crystallized.…”

Section: Ionic Liquid Electrolytesmentioning

confidence: 99%

Ions Transport in Electrochemical Energy Storage Devices at Low Temperatures

Sun

Liu

et al. 2021

Adv Funct Materials

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The operation of electrochemical energy storage (EES) devices at low temperatures as normal as at room temperature is of great significance for their lowtemperature environment application. However, such operation is plagued by the sluggish ions transport kinetics, which leads to the severe capacity decay or even failure of devices at low-temperature conditions. In this review, the difficulties of ions transport in electrolyte, electrolyte/electrode interface, and electrode material at low temperatures are discussed in depth, and the reported strategies to solve the corresponding problems are surveyed subsequently. Finally, the views on how to build high-performance low-temperatureavailable EES devices as well as their development directions are put forward.

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Ion regulation of ionic liquid electrolytes for supercapacitors

Abstract: As a member of the liquid electrolyte family, ionic liquids (ILs) possess distinctive chemical and electrochemical stability, offering a pathway to realize supercapacitors (SCs) with both outstanding energy density and...

Cited by 91 publications

References 169 publications

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

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

Recent Advances in Electrolytes for “Beyond Aqueous” Zinc‐Ion Batteries

Ions Transport in Electrochemical Energy Storage Devices at Low Temperatures

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