Ways to form electrodes for supercapacitors with aqueous and organic electrolytes and specific features of these methods

Киселева, Е. А.; Lelin, Fedor; Zhurilova, M. A.; Школьников, Е. И.

doi:10.1134/s107042721705007x

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…Most likely, this is due to the peculiarities of the formation of the electrode structure for various methods of their manufacture. Sputtered electrodes have a more friable structure [2]. Their density is lower than that of electrodes made by calendering.…”

Section: Introductionmentioning

confidence: 98%

Gaz Diffusion Layers from functional carbon materials for fuel cells used in energy installations

Киселева

Vasilenko

2018

MATEC Web Conf.

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Abstract. Gas Diffusion Layers (GDL) for fuel cells are two-dimensional carbon materials designed to obtain a smaller thickness, greater bending stiffness, lower residual deformation and lower compressibility compared to analogs. To produce it, functional carbon materials were used: activated carbon of own production, from vegetable raw materials, acetylene black and single-walled Tuball nanotubes. Dependence on the amount of binder is shown, as are the properties of electrodes made by calendering. The resistance of the rolled electrodes is much lower than that of the sputtered electrodes. There are proposed 4 variants of electrodes, which can be used in fuel cells and are used in power energy installations.

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Section: Introductionmentioning

confidence: 98%

Gaz Diffusion Layers from functional carbon materials for fuel cells used in energy installations

Киселева

Vasilenko

2018

MATEC Web Conf.

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“…Such a process has been the topic of many modeling and experimental studies in the field of lithium-ion batteries [ 22 , 23 , 24 , 25 , 26 , 27 ], organic lithium-ion batteries [ 28 ], lithium-sulfur batteries [ 29 ] or zinc-based batteries [ 30 ]. It is most rarely reported for supercapacitors [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Electrode Design for MnO2-Based Aqueous Electrochemical Capacitors: Influence of Porosity and Mass Loading

Douard¹,

Athouël²,

Brown³

et al. 2021

Materials

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The purpose of this study is to highlight the influence of some fabrication parameters, such as mass loading and porosity, which are not really elucidated and standardized during the realization of electrodes for supercapacitors, especially when using metal oxides as electrode materials. Electrode calendering, as one stage during the fabrication of electrodes, was carried out step-by-step on manganese dioxide electrodes to study the decreasing porosity effect on the electrochemical performance of a MnO2 symmetric device. One other crucial parameter, the mass loading, which has to be understood and well used for realistic supercapacitors, was investigated concurrently. Gravimetric, areal and volumetric capacitances are highlighted, varying the porosity for low-, medium- and large-mass loading. Low-loading leads to the best specific capacitances but is not credible for realistic supercapacitors, except for microdevices. Down 50% porosities after calendering, capacitances are increased and become stable faster, suggesting a faster wettability of the dense electrodes by the electrolyte, especially for high-mass loading. EIS experiments performed on electrodes without and with calendering lead to a significant decrease of the device’s time response, especially at high loading. A high-mass loading device seems to work as a power battery, whereas electrode calendaring, which allows decreasing the time response, leads to an electrical behavior closer to that expected for a supercapacitor.

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“…[11][12][13] By modeling advanced transport properties, it is possible to address the specific role of the cation-solvent couple [14,15] and to clarify the importance of the anion in the ACbased EDLC performances. [16] Various types of liquid electrolytes have been developed for SCs and can be further grouped into aqueous, [17,18] organic, [19,20] ionic liquids [21,22] or deep eutectic solvents. [23,24] In organic media, the electrolytes are composed of salts dissolved in a pure solvent or a mixture of solvents such as nitriles, [25,26] alkylcarbonates [27,28] or ethers.…”

Section: Introductionmentioning

confidence: 99%

Role of FTFSI Anion Asymmetry on Physical Properties of AFTFSI (A=Li, Na and K) Based Electrolytes and Consequences on Supercapacitor Application

2021

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This study compares the physicochemical properties of six electrolytes comprising of three salts: LiFTFSI, NaFTFSI and KFTFSI in two solvent mixtures, the binary (3EC/7EMC) and the ternary (EC/PC/3DMC). The transport properties (conductivity, viscosity) as a function of temperature and concentration were modeled using the extended Jones-Dole-Kaminsky equation, the Arrhenius model, and the Eyring theory of transition state for activated complexes. Results are discussed in terms of ionicity, solvation shell, and cross-interactions between electrolyte components. The application of the six formulated electro-lytes in symmetrical activated carbon (AC)//AC supercapacitors (SCs) was characterized by cyclic voltammetry (CV), galvanostatic cycling with potential limitation (GCPL), electrochemical impedance spectroscopy (EIS) and accelerated aging. Results revealed that the geometrical flexibility of the FTFSI anion allows it to access and diffuse easily in AC whereas its counter ions (Li + , Na + or K + ) can remain trapped in porosity. However, this drawback was partially resolved by mixing LiFTFSI and KFTFSI salts in the electrolyte.

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Ways to form electrodes for supercapacitors with aqueous and organic electrolytes and specific features of these methods

Cited by 5 publications

References 7 publications

Gaz Diffusion Layers from functional carbon materials for fuel cells used in energy installations

Gaz Diffusion Layers from functional carbon materials for fuel cells used in energy installations

Electrode Design for MnO2-Based Aqueous Electrochemical Capacitors: Influence of Porosity and Mass Loading

Role of FTFSI Anion Asymmetry on Physical Properties of AFTFSI (A=Li, Na and K) Based Electrolytes and Consequences on Supercapacitor Application

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