High-energy density graphite/AC capacitor in organic electrolyte

Khomenko, Volodymyr; Raymundo-Piñero, E.; Béguin, François

doi:10.1016/j.jpowsour.2007.11.101

Cited by 444 publications

(270 citation statements)

References 21 publications

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“…This combination allows taking advantage of the high capacitances of pseudocapacitive materials, while the operational voltage window and cell capacitance is enhanced by the wise selection of a porous carbon material that takes the role of the electrode where the pseudocapacitive material shows no redox contribution and low stability. This configuration have been profited for the development of Li-ion capacitors that combines an activated carbon electrode with graphite (Khomenko et al, 2008) or crystalline intercalation compounds (Amatucci et al, 2001). Wide voltage in water-based electrolytes capacitors can be also achieved using in the same cell an electrode made with transition metal oxides (Cottineau et al, 2006;Khomenko et al, 2006) and conducting polymers (Laforgue et al, 2001;Salinas-Torres et al, 2013) supported over a carbon material and combined with an activated carbon electrode.…”

Section: Introductionmentioning

confidence: 99%

Design of Activated Carbon/Activated Carbon Asymmetric Capacitors

et al. 2016

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Supercapacitors are energy storage devices that offer a high power density and a low energy density in comparison with batteries. Their limited energy density can be overcome by using asymmetric configuration in mass electrodes, where each electrode works within their maximum available potential window, rendering the maximum voltage output of the system. Such asymmetric capacitors are optimized using the capacitance and the potential stability limits of the electrodes, with the reliability of the design largely depending on the accuracy and the approach taken for the electrochemical characterization. Therefore, the performance could be lower than expected and even the system could break down, if a well thought out procedure is not followed.In this work, a procedure for the development of asymmetric supercapacitors based on activated carbons is detailed. Three activated carbon materials with different textural properties and surface chemistry have been systematically characterized in neutral aqueous electrolyte. The asymmetric configuration of the masses of both electrodes in the supercapacitor has allowed to cover a higher potential window, resulting in an increase of the energy density of the three devices studied when compared with the symmetric systems, and an improved cycle life.

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Section: Introductionmentioning

confidence: 99%

Design of Activated Carbon/Activated Carbon Asymmetric Capacitors

et al. 2016

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“…Electrochemical double-layer capacitors (EDLCs) [1], also known as supercapacitors or ultracapacitors, are fast energy storage and delivery devices, with power and energy density performance in between traditional dielectric capacitors which have high power output, and batteries/fuel cells which have large energy storage. They can be used as alternative or complementary power sources in various applications including telecommunication devices, standby power systems, portable electronic devices and hybrid electric vehicles [2].…”

Section: Introductionmentioning

confidence: 99%

Phenolic carbon cloth-based electric double-layer capacitors with conductive interlayers and graphene coating

et al. 2015

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Phenolic resin-derived activated carbon (AC) cloths are used as electrodes for large-scale electric doublelayer capacitors or supercapacitors. To increase the energy and power density of the supercapacitor, the contact resistance between the carbon cloth and the aluminium foil current collector is reduced by modifying the Al current collectors. Different modified Al current collectors, including Toyal-Carbo Ò (surface-modified Al), DAG Ò (deflocculated Acheson TM graphite) coating and poly(3,4-ethylenedioxythiophene) (PEDOT) coating, have been tested and compared. The use of modified Al current collectors are shown to greatly reduce the contact resistance between the AC cloth and the Al foil. Another solution investigated in this study is to coat AC cloth with graphene through electrophoretic deposition (EPD). The graphene coated AC cloth is shown increased the capacitance and greatly reduced internal resistance.Graphical Abstract

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“…Several strategies have been promoted [1][2][3][4][5]. One of these methods is combining the high specific power of the supercapacitors with the high specific energy of the batteries, named lithium-ion capacitors (LICs).…”

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confidence: 99%

“…The most widely investigated approach is internal serial hybridization. Amatucci et al [1] developed the first internal serial non-aqueous hybrid device using a Li + intercalation negative electrode based on Li 4 Ti 5 O 12 , with activated carbon as an electrical double layer positive electrode. However, Cericola et al [6] reported that parallel hybridization is superior to the serial approach.…”

mentioning

confidence: 99%

“…The device demonstrated good rate capability and a specific energy of 40 W h kg −1 . Hu et al [9,10] In respect that graphite materials [11], the best choice for the negative electrode of lithium-ion batteries, can be intercalated by Li + at more negative potentials and are environment friendly, the graphite/AC LICs were also studied [4]. Still, employing graphite as negative electrode in LICs resulted in inevitable irreversible capacity loss (ICL) [11], which prevents the positive electrode from discharging fully [5], and leads to lower efficiency as well as poor electrochemical performance.…”

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confidence: 99%

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Electrochemical performance of MCMB/(AC+LiFePO4) lithium-ion capacitors

et al. 2013

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Lithium-ion capacitors (LICs) were fabricated using mesocarbon microbeads (MCMB) as a negative electrode and a mixture of activated carbon (AC) and LiFePO 4 as a positive electrode (abbreviated as LAC). The phase structure and morphology of LAC samples were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The electrochemical performance of the LICs was studied using cyclic voltammetry, charge-discharge rate measurements, and cycle performance testing. A LIC with 30 wt% LiFePO 4 was found to have the best electrochemical performance with a specific energy density of 69.02 W h kg −1 remaining at 4 C rate after 100 cycles. Compared with an AC-only positive electrode system, the ratio of practical capacity to theoretical calculated capacity of the LICs was enhanced from 42.22% to 56.59%. It was proved that adding LiFePO 4 to AC electrodes not only increased the capacity of the positive electrode, but also improved the electrochemical performances of the whole LICs via Li + pre-doping.

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High-energy density graphite/AC capacitor in organic electrolyte

Cited by 444 publications

References 21 publications

Design of Activated Carbon/Activated Carbon Asymmetric Capacitors

Design of Activated Carbon/Activated Carbon Asymmetric Capacitors

Phenolic carbon cloth-based electric double-layer capacitors with conductive interlayers and graphene coating

Electrochemical performance of MCMB/(AC+LiFePO4) lithium-ion capacitors

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