All-solid-state flexible supercapacitors based on papers coated with carbon nanotubes and ionic-liquid-based gel electrolytes

Kang, Yu; Chung, Haegeun; Han, Chi Hwan; Kim, Woong

doi:10.1088/0957-4484/23/28/289501

Cited by 65 publications

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“…Approaches including CVD/floating catalyst CVD [41][42][43][44][45][46][47], vacuum filtration [48][49][50][51][52], interfacial reaction [53,54], and printing [55] have been developed to fabricate CNT films for use in flexible supercapacitor applications.…”

Section: Cnt Filmsmentioning

confidence: 99%

Recent advances in flexible supercapacitors based on carbon nanotubes and graphene

Zhang

2017

Sci. China Mater.

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Section: Cnt Filmsmentioning

confidence: 99%

Recent advances in flexible supercapacitors based on carbon nanotubes and graphene

Zhang

2017

Sci. China Mater.

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“…[26][27][28][29][30][31][32] Recent work shows that integrated SC confi gurations can be achieved using gel electrolyte as both the electrolyte and thinner separator. [ 26,27,29,33,34 ] Compared to conventional SC confi gurations, the novel and simplifi ed SC designs signifi cantly improve the fl exibility of SC devices. The salient features of various nanocarbon-based materials and SC devices based on then are summarized in Table 2 , 3 , 4 , and 5 .…”

Section: Introductionmentioning

confidence: 99%

Programmable Nanocarbon‐Based Architectures for Flexible Supercapacitors

Niu

Liu

Zhang

et al. 2015

Advanced Energy Materials

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Supercapacitors (SCs), also called electrochemical capacitors, often show high power density, excellent charge/discharge rates, and long cycle life. The recent development of flexible and wearable electronic devices requires that their power sources be sufficiently compact and flexible to match these electronic components. Therefore, flexible SCs have attracted much attention to power current advanced electronics that can be flexible and wearable. In the past several years, many different strategies have been developed to programmably construct different nanocarbon materials into bendable electrode architectures. Furthermore, flexible SC devices with simplified configurations have also been designed based on these nanocarbon‐based architectures. Here, recent developments in the programmable assembly of bendable architectures based on nanocarbon materials are presented. Additionally, the design of flexible nanocarbon‐based SC devices with various configurations is highlighted. The progress made recently paves the way for further development of nanocarbon architectures and corresponding flexible SC devices. Future development and prospects in this area are also analyzed.

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“…Capacitive behavior is clearly retained at frequencies above 1 kHz. Ultimately our plan is to use a solid-state ionic liquid electrolyte, [16][17][18][19] which should allow high temperature operation and potentially higher cell operating voltage. …”

mentioning

confidence: 99%

Vertically-Oriented Graphene Electric Double Layer Capacitor Designs

Miller

Outlaw

2015

J. Electrochem. Soc.

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High-voltage electric double layer capacitors (EDLCs) capable of efficient AC line-filtering have been developed. They were fabricated with vertically-oriented graphene nanosheet (VOGN) electrodes using a planar design. Two approaches were examined to series connect EDLC cells and thus achieve high-voltage operation. Electrical performance of VOGN electric double layer capacitors fabricated with an ionic liquid electrolyte was measured at temperatures up to 125 • C. Volume comparisons are made between VOGN electric double layer capacitors and aluminum electrolytic capacitors. A practical design is presented that provides the VOGN electric double layer capacitor with more than an order-of-magnitude higher ripple-current filtering performance Efficient AC line-filtering (120 Hz) by an electric double layer capacitor (EDLC) was first demonstrated in 2010 using electrodes of vertically-oriented graphene (VOGN) grown directly on nickel.1 This electrode material and its structure ( Figure 1) reduce series resistance to an absolute minimum value and effectively eliminate distributed charge storage, i.e. porous electrode behavior with its corresponding transmission-line-like electrical response. In brief, EDLC electrodes are made by growing the VOGN on bare nickel current collectors using radio frequency plasma enhanced chemical vapor deposition of CH 4 /H 2 or C 2 H 2 /H 2 feed gases.2,3 Growth temperature is typically in the 550 to 850• C range. No catalytic seed material is required or added to the nickel surface. Growth proceeds by Volmer-Weber island impingement, 4 which yields an upturned structure at carbon island boundaries. There is significant carbon dissolution into the nickel during growth that helps ensure low-resistance ohmic connection between the high-conductivity graphene sheets and the metal current collector. Typical characteristic VOGN spacing is ∼200 nm and heights ∼1 μm, a void length-to-width ratio that thwarts porous electrode behavior as found with activated-carbon. 5Generally the Raman D band to G band intensity ratio decreases with growth time indicating that crystalline order of the VOGN increases with nanosheet height, which increases approximately linearly with time at growth rates of 70 nm/minute using CH 4 and 190 nm/minute using C 2 H 2 .6 Electrode capacitance at 120 Hz typically is in the 200 to 300 μF/cm 2 range, depending on VOGN growth conditions and growth time. The frequency response reported for EDLCs made using other external-surface-area nanomaterials is generally below that demonstrated by VOGN grown on nickel because of higher series resistance and/or distributed charge storage behavior. 7-12State of the art commercial EDLCs, which use internal-surface-area activated carbon electrode materials, typically have a -45• phase angle at ∼0.2 Hz and show inductive behavior (positive phase angle) at 120 Hz, rendering them totally useless for AC line filtering. 13 EDLC DesignsA conventional EDLC "sandwich" design, as depicted in Figure 2, is poorly suited for capacitors made using V...

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All-solid-state flexible supercapacitors based on papers coated with carbon nanotubes and ionic-liquid-based gel electrolytes

Abstract: The full text of the corrigendum is available in the pdf provided.

Cited by 65 publications

References 0 publications

Recent advances in flexible supercapacitors based on carbon nanotubes and graphene

Recent advances in flexible supercapacitors based on carbon nanotubes and graphene

Programmable Nanocarbon‐Based Architectures for Flexible Supercapacitors

Vertically-Oriented Graphene Electric Double Layer Capacitor Designs

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