Flexible supercapacitor yarns with coaxial carbon nanotube network electrodes

Smithyman, Jesse; Liang, Richard

doi:10.1016/j.mseb.2014.01.013

Cited by 24 publications

(17 citation statements)

References 43 publications

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“…32 At lower voltages 2.0 V to 2.5 V, capacitance remains close to 20-24 F/g, in line with literature data. 28,31,37 More interestingly, Figure 4b shows that all CV curves are butterfly-shaped, with current changing substantially with applied voltage. Such behaviour is common in quasi-metallic carbons and has been observed in HOPG, 58,59 highly graphitic carbon fibre derived from phenolic resin, 60 some activated carbons, 61 graphene 62 and SWCNT.…”

Section: Electrochemical Characterization Of Cnt Fibres In 3electrodementioning

confidence: 89%

Macroscopic fibres of CNTs as electrodes for multifunctional electric double layer capacitors: from quantum capacitance to device performance

et al. 2016

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In this work we present a combined electrochemical and mechanical study of mesoporous electrodes based on CNT fibres in the context of electric double layer capacitors. We show that through control of the synthetic and assembly processes of the fibres, it is possible to obtain an active material that combines a surface area of 250 m(2) g(-1), high electrical conductivity (3.5 × 10(5) S m(-1)) and mechanical properties in the high-performance range including toughness (35 J g(-1)) comparable to that of aramid fibre (e.g. Kevlar). These properties are a consequence of the predominant orientation of the CNTs, observed by wide- and small-angle X-ray diffraction, and to the exceptionally long CNT length on the millimetre scale. Cyclic voltammetry measurements in a three-electrode configuration and using 1-butyl-3-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (PYR14TFSI) ionic liquid electrolyte, show that the CNT fibres have a large quantum capacitance, evidenced by the near linear dependence of geometric capacitance (and conductivity) on potential bias. This reflects the low dimensionality of the CNT building blocks, which were purposely synthesised to have 1-5 layers and a high degree of graphitization. From the charge-discharge measurements of supercapacitor devices with symmetric CNT fibre electrodes we obtain power and energy densities as high as 58 kW kg(-1) and 14 Wh kg(-1), respectively. These record-high values for CNT fibre-based supercapacitors, are a consequence of the low equivalent series resistance due to the high conductivity of the fibres, the large contribution from quantum capacitance, and the wide stability window of the ionic liquid (3.5 V). Cycle life experiments demonstrate stable capacitance and energy retention over 10,000 cycles of charge-discharge at 3.5 V.

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Section: Electrochemical Characterization Of Cnt Fibres In 3electrodementioning

confidence: 89%

Macroscopic fibres of CNTs as electrodes for multifunctional electric double layer capacitors: from quantum capacitance to device performance

et al. 2016

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“…Yarn supercapacitors that have the merits of tiny volume, high flexibility and wearability are promising for the next generation of wearable electronic devices . CNT yarn is a promising flexible electrode material because they are very strong and flexible for seamlessly weaving and knitting into fabrics . Vertically aligned CNT forests can be drawn into continuous webs that may be further converted into CNT yarns by twist insertion, mechanical rubbing and liquid densification .…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13][14] CNT yarn is a promising fl exible electrode material because they are very strong and fl exible for seamlessly weaving and knitting into fabrics. [15][16][17] Vertically aligned CNT forests can be drawn into continuous webs that may be further converted into CNT yarns by twist insertion, mechanical rubbing and liquid densifi cation. [18][19][20] Besides the high strength and excellent fl exibility, the resulting CNT yarns have a porous structure and are electrically conductive.…”

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confidence: 99%

High-Performance Two-Ply Yarn Supercapacitors Based on Carbon Nanotube Yarns Dotted with Co₃O₄and NiO Nanoparticles

Miao

2014

Small

236

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Yarn supercapacitors are promising power sources for flexible electronic applications that require conventional fabric-like durability and wearer comfort. Carbon nanotube (CNT) yarn is an attractive choice for constructing yarn supercapacitors used in wearable textiles because of its high strength and flexibility. However, low capacitance and energy density limits the use of pure CNT yarn in wearable high-energy density devices. Here, transitional metal oxide pseudocapacitive materials NiO and Co3 O4 are deposited on as-spun CNT yarn surface using a simple electrodeposition process. The Co3 O4 deposited on the CNT yarn surface forms a uniform hybridized CNT@Co3 O4 layer. The two-ply supercapacitors formed from the CNT@Co3 O4 composite yarns display excellent electrochemical properties with very high capacitance of 52.6 mF cm(-2) and energy density of 1.10 μWh cm(-2) . The high performance two-ply CNT@Co3 O4 yarn supercapacitors are mechanically and electrochemically robust to meet the high performance requirements of power sources for wearable electronics.

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“…The porous CNTCP has excellent flexibility and conductivity. It has a broad application prospect for LIB applications including lithium-sulfur battery [1-15], Nano-SnO 2 anode , silicone anode [44-56], Li/CFx battery [57][58][59][60][61][62][63], and supercapacitors [64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80]. In this paper, we report the porous CNTCP applications as current collector and electrode for lithium ion battery and supercapacitor, respectively.…”

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confidence: 99%

The Porous Carbon Nanotube-Cellulose Papers as Current Collector and Electrode for Lithium Ion Battery and Supercapacitor Applications

Sun¹,

Cai²,

Chen³

et al. 2018

Carbon Nanotubes - Recent Progress

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Lithium ion batteries (LIB) and supercapacitors (electric double-layer capacitors (EDLCs) and lithium ion capacitors (LIC)) are the most energy storage service for mobile application. Lithium ion batteries are currently the most popular type of battery for powering portable electronic devices and are growing in popularity for defense, automotive and aerospace applications. The investigation of supercapacitors (SCs) has also achieved significant progresses. Although they have shown remarkable commercial successes, the electrodes and their constituent materials are still the subject of intensive research. Our research focused on a new type of carbon nanotube-cellulose composite materials as current collector of LIBs and as electrodes of SCs for improving and enhancing the energy/ power density and cyclic performance of them. Carbon nanotubes (CNTs) have been widely used as conductive agent for both anodes and cathodes to replace super carbon black to satisfy the multifunctional requirements for LIBs. Applications of carbon nanotubes (CNTs) in lithium ion battery and supercapacitorLithium ion batteries (LIBs) and supercapacitors (SCs) are considered to be the most promising energy storage devices because of their relatively high energy density, good cycle performance, power performance, longer service life, and green environmental characteristics. LIBs have a broad application prospects in portable electronic equipment, electric vehicles, and hybrid vehicles [1,2].The electrodes of LIB commonly use copper foil or aluminum foil as a current collector, and the active material is coated on the current collector. Carbon nanotubes (CNTs) have unique features of one-dimension, large surface area and high conductivity, which contribute to electrochemical performance of LIBs and SCs [3][4][5]. Thus, many investigations in terms of electrode materials are focused on CNTs. Compared with aluminum foil or copper foil, metal-free current collector is a research hotspot, CNT film or cellulose papers used as negative electrode, or anode current collector was applied in flexible lithium ion battery in many researches [6,7]. CNT-cellulose papers (CNTCPs) are very good host for activated materials, which have a porous structure, easy formability, flexibility, and excellent physical and chemical properties. The porous CNTCP has excellent flexibility and conductivity. It has a broad application prospect for LIB applications including lithium-sulfur battery [1-15], Nano-SnO 2 anode , silicone anode [44-56], Li/CFx battery [57][58][59][60][61][62][63], and supercapacitors [64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80]. In this paper, we report the porous CNTCP applications as current collector and electrode for lithium ion battery and supercapacitor, respectively. Moreover, the CNTs used in this study are whisker multiwalled carbon nanotubes.The fabrication process of the papers is simple and scalable, similar to those technology widely used for paper making in industry. The porous CNTCP with interconnected channel ...

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Flexible supercapacitor yarns with coaxial carbon nanotube network electrodes

Cited by 24 publications

References 43 publications

Macroscopic fibres of CNTs as electrodes for multifunctional electric double layer capacitors: from quantum capacitance to device performance

Macroscopic fibres of CNTs as electrodes for multifunctional electric double layer capacitors: from quantum capacitance to device performance

High-Performance Two-Ply Yarn Supercapacitors Based on Carbon Nanotube Yarns Dotted with Co₃O₄and NiO Nanoparticles

The Porous Carbon Nanotube-Cellulose Papers as Current Collector and Electrode for Lithium Ion Battery and Supercapacitor Applications

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Flexible supercapacitor yarns with coaxial carbon nanotube network electrodes

Cited by 24 publications

References 43 publications

Macroscopic fibres of CNTs as electrodes for multifunctional electric double layer capacitors: from quantum capacitance to device performance

Macroscopic fibres of CNTs as electrodes for multifunctional electric double layer capacitors: from quantum capacitance to device performance

High-Performance Two-Ply Yarn Supercapacitors Based on Carbon Nanotube Yarns Dotted with Co3O4and NiO Nanoparticles

The Porous Carbon Nanotube-Cellulose Papers as Current Collector and Electrode for Lithium Ion Battery and Supercapacitor Applications

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High-Performance Two-Ply Yarn Supercapacitors Based on Carbon Nanotube Yarns Dotted with Co₃O₄and NiO Nanoparticles