Electrolyte Engineering: Optimizing High‐Rate Double‐Layer Capacitances of Micropore‐ and Mesopore‐Rich Activated Carbon

Chen, Ting Hao; Yang, Cheng; Su, Ching Yuan; Lee, Tai Chou; Dong, Quan; Chang, Jeng‐Kuei

doi:10.1002/cssc.201701476

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…Ta ble 3s hows that the AC meso capacitances measured in variousI Ls at 0.5 Ag À1 are all within 80-83 Fg À1 .F or AC meso ,t he type of IL constituent ion does not appear to significantly affect the capacitance. Better AC micro pore/ion size matching, which facilitates the dissociation of ion pairs and aggregations, [35][36][37] could explain the higherc apacitances obtained for the AC micro cells compared to those for the AC meso cells at 0.5 Ag À1 .T he rate capability of the AC meso cells decreased in the order […”

Section: Resultsmentioning

confidence: 99%

“…For AC meso , the type of IL constituent ion does not appear to significantly affect the capacitance. Better AC micro pore/ion size matching, which facilitates the dissociation of ion pairs and aggregations, could explain the higher capacitances obtained for the AC micro cells compared to those for the AC meso cells at 0.5 A g −1 . The rate capability of the AC meso cells decreased in the order [EMI][FSI]>[PMP][FSI]>[BMP][FSI]>[EMI]BF 4 >[EMI][TFSI], which is consistent with that for the AC micro cells.…”

Section: Resultsmentioning

confidence: 99%

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Supercapacitive Properties of Micropore‐ and Mesopore‐Rich Activated Carbon in Ionic‐Liquid Electrolytes with Various Constituent Ions

et al. 2019

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Ionic‐liquid (IL) electrolytes, characterized by large potential windows, intrinsic ionic conductivity, low environmental hazard, and high safety, are used for micropore‐ and mesopore‐rich activated‐carbon (ACmicro and ACmeso) supercapacitors. IL electrolytes consisting of various cations [1‐ethyl‐3‐methylimidazolium (EMI+), N‐propyl‐N‐methylpyrrolidinium (PMP+), and N‐butyl‐N‐methylpyrrolidinium (BMP+)] and various anions [bis(trifluoromethylsulfonyl)imide (TFSI−), BF4−, and bis(fluorosulfonyl)imide (FSI−)] are investigated. The electrolyte conductivity, viscosity, and ion transport properties at the ACmicro and ACmeso electrodes are studied. In addition, the capacitance, rate capability, and cycling stability of the two types of AC electrodes are systematically examined and post‐mortem material analyses are conducted. The effects of IL composition on the charge–discharge capacitances of the ACmicro electrodes are more pronounced than those for the ACmeso electrodes. The FSI‐based IL electrolytes, for which electrochemical properties are cation dependent, are found to be promising. Incorporating EMI+ with FSI− results in a low electrolyte viscosity and a fast ion transport, giving rise to optimized electrode capacitance and rate capability. Replacing EMI+ with PMP+ increases the cell voltage (to 3.5 V) and maximum energy density (to 42 Wh kg−1) of the ACmicro cell at the cost of cycling stability.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Supercapacitive Properties of Micropore‐ and Mesopore‐Rich Activated Carbon in Ionic‐Liquid Electrolytes with Various Constituent Ions

et al. 2019

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“…Figure e shows the EIS spectra of various cells. The Nyquist plots are characterized by a semicircle (associated with interfacial contact resistance) at high frequency, a nearly 45° sloping line (associated with ion diffusion impedance within AC pores) at intermediate frequency, and a quasi-vertical line (associated with capacitive behavior) at low frequency. ,, The equivalent circuit used to fit the EIS data is shown in the inset. As shown in Table , the interfacial contact resistance ( R inter ) values of the AC-P, AC-MEL, AC-NH 3 , and AC-NO cells were 3.3, 1.8, 2.1, and 1.6 Ω, respectively.…”

Section: Resultsmentioning

confidence: 99%

Manipulation of Nitrogen-Heteroatom Configuration for Enhanced Charge-Storage Performance and Reliability of Nanoporous Carbon Electrodes

Sutarsis

Patra

et al. 2020

ACS Appl. Mater. Interfaces

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In this study, various nitrogen-containing functional groups, namely, pyridine (N-6), pyrrole (N-5), oxidized N (N–O), and quaternary N (N-Q), are created on activated carbon (AC) surface via melamine, ammonia, and nitric oxide doping methods. N-5 and N-6 groups markedly alter the specific surface area and pore size of AC. N–O is found to affect electrolyte wettability, and the N-Q content is closely associated with AC electronic conductivity. The nitrogen-containing groups do not contribute to pseudocapacitance in propylene carbonate and acetonitrile electrolytes. However, the nitric-oxide-treated carbon (AC-NO) exhibits the best high-rate charge–discharge performance among the investigated materials. The N-Q-enriched and N-5/N-6-depleted AC-NO most effectively suppresses the leakage current and gas evolution of supercapacitors. Online gas chromatography is used to analyze the gaseous species produced from AC electrodes. With an appropriate surface functionality on carbon, the cell voltage can be increased to ∼3 V, increasing the energy and power densities. The aging behavior of the carbon electrodes with and without nitrogen modification after being floated at 2.5 V and 70 °C for 3 days is investigated. An effective strategy for enhancing supercapacitor performance and reliability is proposed.

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Ordered nano-structured mesoporous CMK-8 and other carbonaceous positive electrodes for rechargeable aluminum batteries

Rath

et al. 2021

Chemical Engineering Journal

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Electrolyte Engineering: Optimizing High‐Rate Double‐Layer Capacitances of Micropore‐ and Mesopore‐Rich Activated Carbon

Cited by 5 publications

References 33 publications

Supercapacitive Properties of Micropore‐ and Mesopore‐Rich Activated Carbon in Ionic‐Liquid Electrolytes with Various Constituent Ions

Supercapacitive Properties of Micropore‐ and Mesopore‐Rich Activated Carbon in Ionic‐Liquid Electrolytes with Various Constituent Ions

Manipulation of Nitrogen-Heteroatom Configuration for Enhanced Charge-Storage Performance and Reliability of Nanoporous Carbon Electrodes

Ordered nano-structured mesoporous CMK-8 and other carbonaceous positive electrodes for rechargeable aluminum batteries

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