Temperature stable supercapacitors based on ionic liquid and mixed functionalized carbon nanomaterials

Borges, Raquel S.; Ribeiro, Hélio; Lavall, Rodrigo L.; Silva, Glaura G.

doi:10.1007/s10008-012-1785-5

Cited by 43 publications

(28 citation statements)

References 41 publications

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“…Of these systems, the use of activated carbon and graphene electrode materials and ionic liquids electrolytes (PYR, BMI, BMP with 1 m LiTFSI) are common. At 80 °C, the highest reported capacitance ranges from 125 to 158 F g −1 with the PYR and BMP electrolytes at scan rates between 5 and 20 mV s −1 . Upon further increasing the temperature to 100 °C, a value of 130 F g −1 at 5 mV s −1 and 39 F g −1 at 100 mV s −1 is reported for PYR14 TFSI and BMMI TFSI electrolyte systems, respectively.…”

Section: Resultsmentioning

confidence: 97%

“…At 80 °C, the highest reported capacitance ranges from 125 to 158 F g −1 with the PYR and BMP electrolytes at scan rates between 5 and 20 mV s −1 . Upon further increasing the temperature to 100 °C, a value of 130 F g −1 at 5 mV s −1 and 39 F g −1 at 100 mV s −1 is reported for PYR14 TFSI and BMMI TFSI electrolyte systems, respectively. However higher capacitance materials, titanium carbide carbide‐derived carbon (TiC‐CDC), double wall carbon nanotubes (CNT) and graphene oxide, were used as electrodes.…”

Section: Resultsmentioning

confidence: 97%

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Synthesis of an Environmentally Friendly Alkyl Carbonate Electrolyte Based on Glycerol for Lithium‐Ion Supercapacitor Operation at 100 °C

Salari

Cooper

Zhang

et al. 2017

Advanced Sustainable Systems

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LICs) are being investigated as LICs possess favorable performance features of the two former technologies. [1] Significant progress has been made for room temperature LICs during the last several years, however, operation at elevated temperatures (40-150 °C) remains a major challenge and a continuing interest.The most common LICs systems contain well-studied electrode materials such as Li foil, lithiated metal oxides, or carbonaceous materials (graphite, activated carbon, and graphene) and organic solvent electrolytes such as ethylene carbonate (EC) or diethyl carbonate (DEC). Considering the diversity of the active components and electrolyte compositions used in both LIB and ECs systems, a variety of material combinations are available for fabrication of a LIC. Of particular interest to us, are the LICs composed of nonlithiated electrode materials with one of the above mentioned organic solvents containing a Li-salt, as a source of Li-ions, to enhance the electrolyte transport properties. [1f,2] Such LICs exhibit enhanced electrochemical performance.With respect to electrical energy storage device performance and stability at elevated temperatures, the low flash and boiling points of the electrolytes are key limitations of current devices. In the best-case scenario, the device stops working, and in the worst-case scenario, thermal runaway reactions afford a catastrophic failure with a resultant explosion. To address this unmet need, nonflammable and nonvolatile electrolytes based on room temperature ionic liquids (RTILs), [2h,3] ionic liquidcarbonate solvent electrolytes, [4] a composite of Bentonite clay and RTIL, [5] and solid polymer electrolytes [6] are being explored to improve the thermal stability of the devices. However, sacrificed electrochemical performance exists such as a decrease in specific capacitance, rate capability, and/or stability. As an alternative to the above electrolyte formulations for high temperature use, while being cognizant of the design requirement to use greener or more environmentally friendly (biodegradation, renewable, or recyclability) material, we are investigating glycerol carbonate-based electrolytes. Given that carbonate-based electrolytes such as ethylene carbonate dissolve high molar concentrations of Li-salts and perform especially well at RT in LIBs, we reasoned that a small molecule carbonate electrolyte based The increased number of electrical energy storage (EES) systems utilized in everyday products along with the demand for more reliable and safer products that provide high energy densities with faster response times over an extended range of temperatures are catalyzing advances across all areas of EES technology. Here, the preparation and performance evaluation at 100 °C of a high voltage lithium-ion supercapacitor (LIC), comprised of activated carbon electrodes and a novel, environmentally friendly alkyl carbonate electrolyte based on glycerol containing 1 m LiTFSI, are reproted. Use of this ethoxy propylene carbonate electrolyte affords a high capacitance ...

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Synthesis of an Environmentally Friendly Alkyl Carbonate Electrolyte Based on Glycerol for Lithium‐Ion Supercapacitor Operation at 100 °C

Salari

Cooper

Zhang

et al. 2017

Advanced Sustainable Systems

View full text Add to dashboard Cite

show abstract

“…As a result, the latter delivered the highest specific energy density (67 W h kg À1 at 1 A g À1 ), which was much higher than the former (20 W h kg À1 ). 262 [TFSI]based AEDLC could operate within a wide temperature range from À30 to 60 1C at a high operative cell voltage of 3.7 V. A high cycling stability was also observed for these IL-based AEDLCs with a capacitance loss of 2% over 27 000 deep cycles at 60 1C. [259][260][261] For example, Kong et al 259 reported that the addition of small amounts of single walled CNTs (e.g., 0.1 and 0.5 wt%) into the [EMIM][BF 4 ] IL electrolyte could increase the ionic conductivity of the electrolyte.…”

Section: View Article Onlinementioning

confidence: 99%

A review of electrolyte materials and compositions for electrochemical supercapacitors

et al. 2015

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Electrolytes have been identified as some of the most influential components in the performance of electrochemical supercapacitors (ESs), which include: electrical double-layer capacitors, pseudocapacitors and hybrid supercapacitors. This paper reviews recent progress in the research and development of ES electrolytes. The electrolytes are classified into several categories, including: aqueous, organic, ionic liquids, solid-state or quasi-solid-state, as well as redox-active electrolytes. Effects of electrolyte properties on ES performance are discussed in detail. The principles and methods of designing and optimizing electrolytes for ES performance and application are highlighted through a comprehensive analysis of the literature. Interaction among the electrolytes, electro-active materials and inactive components (current collectors, binders, and separators) is discussed. The challenges in producing high-performing electrolytes are analyzed. Several possible research directions to overcome these challenges are proposed for future efforts, with the main aim of improving ESs' energy density without sacrificing existing advantages (e.g., a high power density and a long cycle-life) (507 references).

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“…15,18 Interestingly, very little research has been carried out on hybrid SCs using ionic liquids (ILs), 11 a family of compounds, that because of their properties, it is thought would make very promising electrolytes. [19][20][21] These materials achieve conductivities of the order of 10 -2 and 10 -1 S cm -1 , are not prone to flammability and have a large electrochemical stability window that can exceed 4 V under certain conditions. [22][23] Devices constructed with ILs offer greater security in situations of overpotential, of high temperatures, and their high electrochemical stability window allows the cell to operate at high voltages, thereby maximizing their energy and power density.…”

Section: Introductionmentioning

confidence: 99%

LiFePO₄/Mesoporous Carbon Hybrid Supercapacitor Based on LiTFSI/Imidazolium Ionic Liquid Electrolyte

et al. 2018

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A hybrid SC prepared with mesoporous carbon as the negative electrode, LiFePO 4 as the positive electrode and a LiTFSI/imidazolium ionic liquid solution as electrolyte is presented. The cell was conceived on the basis that it offers all the safety features of ionic liquids (IL) and LiFePO 4 , in addition to the advantages of a high energy density device.Most of the high performance hybrids so far reported in the literature employ aqueous or organic electrolytes, whereas studies of hybrid cells based on IL still rare. Here, a fundamental study was conducted to understand how the different interfaces and mechanisms operate in a hybrid system based on IL electrolyte, and how this affects cell performance. This device was mainly characterized using cyclic chronopotentiometry that allows cell voltage and electrode potentials to be simultaneously recorded. By means of this technique, it was possible to evaluate the overall behavior of the hybrid cell and the faradaic and capacitive electrodes simultaneously, and to compare it with the performance of selected standard cells. The results show that the cell is able to attain an energy density of 43.3 W h kg -1 at 0.010 A g -1 (C/5 in relation to LiFePO 4 ), while maintaining a good cycling performance.

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Temperature stable supercapacitors based on ionic liquid and mixed functionalized carbon nanomaterials

Cited by 43 publications

References 41 publications

Synthesis of an Environmentally Friendly Alkyl Carbonate Electrolyte Based on Glycerol for Lithium‐Ion Supercapacitor Operation at 100 °C

Synthesis of an Environmentally Friendly Alkyl Carbonate Electrolyte Based on Glycerol for Lithium‐Ion Supercapacitor Operation at 100 °C

A review of electrolyte materials and compositions for electrochemical supercapacitors

LiFePO₄/Mesoporous Carbon Hybrid Supercapacitor Based on LiTFSI/Imidazolium Ionic Liquid Electrolyte

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Temperature stable supercapacitors based on ionic liquid and mixed functionalized carbon nanomaterials

Cited by 43 publications

References 41 publications

Synthesis of an Environmentally Friendly Alkyl Carbonate Electrolyte Based on Glycerol for Lithium‐Ion Supercapacitor Operation at 100 °C

Synthesis of an Environmentally Friendly Alkyl Carbonate Electrolyte Based on Glycerol for Lithium‐Ion Supercapacitor Operation at 100 °C

A review of electrolyte materials and compositions for electrochemical supercapacitors

LiFePO4/Mesoporous Carbon Hybrid Supercapacitor Based on LiTFSI/Imidazolium Ionic Liquid Electrolyte

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LiFePO₄/Mesoporous Carbon Hybrid Supercapacitor Based on LiTFSI/Imidazolium Ionic Liquid Electrolyte