The Influence of Specific Surface Area on the Capacitance of the Carbon Electrodes Supercapacitor

Wang, Chih–Ming; Wen, Chih-Yu; Chen, Ying–Chung; Chang, Jui-Yang; Ho, Chia-Wei; Kao, K. C.; Shih, Wei-Che; Chiu, Chun-Ming; Shen, Y. R.

doi:10.12792/iciae2015.077

Cited by 16 publications

(10 citation statements)

References 13 publications

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“…The total capacitance of electrodes was calculated using , where Z i is the imaginary impedance for each electrode at f = 0.1 Hz. C total is directly proportional to the remaining electrochemically active surface area of the electrodes . Therefore, any decrease in capacitance value after SEI is grown indicates the blocking of sites accessible for direct Na + ion adsorption.…”

Section: Results and Discussionmentioning

confidence: 99%

Improvement of Hard Carbon Electrode Performance by Manipulating SEI Formation at High Charging Rates

Rangom

Gaddam

Duignan

et al. 2019

ACS Appl. Mater. Interfaces

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There is a growing demand for high-rate rechargeable batteries for powering electric vehicles and portable electronics. Here, we demonstrate a strategy for improving electrode performance by controlling the formation of solid electrolyte interphase (SEI). A composite electrode consisting of hard carbon (HC) and carbon nanotubes (CNTs) was used to study the formation of the SEI at different charging rates in an electrolyte consisting of 1 M NaClO 4 in a mixed solvent with ethylene carbonate (EC) and propylene carbonate (PC), as well as fluoroethylene carbonate (FEC) additive. The half-cell method was used to form the SEI at different charging rates (e.g., 1, 10, and 100 A/g). Symmetric capacitor cells were employed to study ion transport properties through the SEI. It was found that the SEI is a primary factor responsible for limiting the capacity of the composite anode material in conventional ester-based electrolytes. The electrode with the SEI formed at 100 A/g exhibited the lowest impedance and delivered nearly twice the capacity of the electrode with the SEI formed at 1 A/g. This significant difference is due to a thin SEI formed at the fast charging rate, as has been observed with ether-based electrolytes. An identical decay rate (0.11 mA h/g per cycle) was observed on the electrodes with SEIs formed at different charging rates in an ester electrolyte. No chemical difference among the three SEI layers was found. However, morphological differences of the SEI layers were observed. This difference is believed to account for the different electrochemical behaviors of the electrodes. This work shows that high charging rates can result in the formation of an optimal SEI layer, contradicting the widely accepted practice of using low charging rates during the SEI formation in alkali-ion batteries.

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Section: Results and Discussionmentioning

confidence: 99%

Improvement of Hard Carbon Electrode Performance by Manipulating SEI Formation at High Charging Rates

Rangom

Gaddam

Duignan

et al. 2019

ACS Appl. Mater. Interfaces

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“…An increasing demand for EDLCs implies the need for large amounts of electrode materials which, at best, exhibit high specific surface areas (SSA), tailored pore size distributions, and certain surface functionalities (Frackowiak & Béguin, 2001;Ghosh & Hee, 2012;Hu et al, 2010;Pandolfo & Hollenkamp, 2006;Wang et al, 2015). By carbonization of biomass under inert conditions (pyrolysis), it is possible to produce environmentally friendly materials with the above-mentioned properties (Raymundo-Piñero, Cadek, & Béguin, 2009).…”

Section: Introductionmentioning

confidence: 99%

Study of the electrical conductivity of biobased carbonaceous powder materials under moderate pressure for the application as electrode materials in energy storage technologies

et al. 2018

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This study focusses on the assessment of the electrical conductivity (EC) of biobased electrode materials for the application in energy storage devices and presents a simple and reproducible method to measure the EC of carbonaceous powders under moderate pressure (10–50 N). Based on the pyrolysis of corncob at three different temperatures (600, 800, and 900°C) and further treatments of the biochar obtained at 600°C, 11 different carbonaceous powder materials were produced including biochars, activated carbons, and composites. Composite materials were obtained by adding either metal oxide (RuO2 or Fe3O4) in different proportions or additives which are commonly used in electrode production (5 wt% binder and 15 wt% conductive additive). Furthermore, one physically activated commercial AC based on peat with a known EC of 33 S/m was treated with additives and used as a reference. For all materials, an increase of applied pressure resulted in higher EC values due to closer particle contact. The comparison of two methods (with and without preload) showed that a prepelletization of the samples is not necessary to obtain reliable results. By analyzing the obtained EC values while taking mechanical and physicochemical properties into account, it could be shown that a high carbonization temperature and high specific surface area favor the increase of EC. Furthermore, certain proportions of metal oxides lead to an improvement of EC (40 wt% RuO2, 10 wt% Fe3O4), while the treatment with additives leads to a decrease of EC. The EC values among all samples varied between 0.8 S/m (biochar) and 408 S/m (AC/RuO2 composite) at the highest pressure level (637 kPa). Thus, promising biobased electrode materials for environmentally friendly energy storage technologies are presented with the aim of contributing to the establishment of a biobased resource and product platform for bioeconomy.

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“…The specific capacitance values for the activated carbon electrodes in aqueous electrolytes (between 100 to 300 F•g −1 ) is higher than in organic solution (<150 F•g −1 ), since the size of the ions for the organic electrode is larger [11,95] [72].…”

Section: Activated Carbon Materials (Acs)mentioning

confidence: 94%

“…The capacitance of the electrodes extremely relies upon the SSA. Consequently, owing to the large SSA and the high porosity of the carbonaceous materials, they have displayed enhanced capacitance [72].…”

Section: Nanostructured Carbon-based Materialsmentioning

confidence: 99%

Electrode Materials for Supercapacitors: A Review of Recent Advances

2020

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The advanced electrochemical properties, such as high energy density, fast charge–discharge rates, excellent cyclic stability, and specific capacitance, make supercapacitor a fascinating electronic device. During recent decades, a significant amount of research has been dedicated to enhancing the electrochemical performance of the supercapacitors through the development of novel electrode materials. In addition to highlighting the charge storage mechanism of the three main categories of supercapacitors, including the electric double-layer capacitors (EDLCs), pseudocapacitors, and the hybrid supercapacitors, this review describes the insights of the recent electrode materials (including, carbon-based materials, metal oxide/hydroxide-based materials, and conducting polymer-based materials, 2D materials). The nanocomposites offer larger SSA, shorter ion/electron diffusion paths, thus improving the specific capacitance of supercapacitors (SCs). Besides, the incorporation of the redox-active small molecules and bio-derived functional groups displayed a significant effect on the electrochemical properties of electrode materials. These advanced properties provide a vast range of potential for the electrode materials to be utilized in different applications such as in wearable/portable/electronic devices such as all-solid-state supercapacitors, transparent/flexible supercapacitors, and asymmetric hybrid supercapacitors.

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The Influence of Specific Surface Area on the Capacitance of the Carbon Electrodes Supercapacitor

Cited by 16 publications

References 13 publications

Improvement of Hard Carbon Electrode Performance by Manipulating SEI Formation at High Charging Rates

Improvement of Hard Carbon Electrode Performance by Manipulating SEI Formation at High Charging Rates

Study of the electrical conductivity of biobased carbonaceous powder materials under moderate pressure for the application as electrode materials in energy storage technologies

Electrode Materials for Supercapacitors: A Review of Recent Advances

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