Multilayer‐Folded Graphene Ribbon Film with Ultrahigh Areal Capacitance and High Rate Performance for Compressible Supercapacitors

Sheng, Lizhi; Jin, Chao; Jiang, Lili; Jiang, Zimu; Liu, Zheng; Wei, Tong; Fan, Zhuangjun

doi:10.1002/adfm.201800597

Cited by 163 publications

(110 citation statements)

References 66 publications

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“…[9d,10] The mechanical stress developed in these dense‐packing PPy composites due to ion exchange in charging/discharging process would aggravate the cracking of PPy electrodes, leading to degradation of electrochemical and mechanical performance under extended periods of physical stress . Moreover, the dense structure greatly impedes electrolyte penetration and ion transport, which deteriorates the electrochemical performance at high charging/discharging rates . Therefore, designing flexible PPy composite electrodes with porous structure for effective stress relief and ion transfer is crucial for fabrication of 3D stretchable supercapacitors.…”

Section: Methodsmentioning

confidence: 99%

Honeycomb‐Lantern‐Inspired 3D Stretchable Supercapacitors with Enhanced Specific Areal Capacitance

et al. 2018

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The demand for energy storage systems for powering wearable and medical devices has motivated the development of functional supercapacitors. [1] Specifically, stretchable supercapacitors are regarded as a promising energy storage device to power wearable and stretchable electronics for communication, fitness, and healthcare applications. [2] Currently, the reported stretchable supercapacitors are mainly based on 2D shapes, which rely on the design of planar stretchable electrodes, such as prestretched waveor wrinkle-like electrode, [3] bridgeisland electrode, [4] and textile electrode [5] (Scheme 1a). However, these 2D stretchable supercapacitors usually require thin electrode (<100 µm, Table S1, Supporting Information) for high stretchability (>100%), which restricts active material loading in the vertical direction (z-axis), leading to low specific areal capacitance. [1c,3a,b,d,6] Moreover, the 2D stretchable supercapacitors are limited to the 2D surface, leading to poor utilization of the entire 3D space of the wearable device. To overcome the above-mentioned limitations of 2D stretchable supercapacitors, 3D stretchable supercapacitors with higher mass loading and enhanced specific areal capacitance are highly desired. In conventional 2D stretchable supercapacitors, extended device thickness with higher mass loading corresponding to thicker electrode would suffer from longer ionic transport path, which increases the internal resistance and deteriorates the enhancement of the specific areal capacitance (Scheme 1b; Figure S1, Supporting Information). Additionally, the peak strains of stretchable electrodes are increased with increasing electrode thickness, which restricts the stretchability of the supercapacitors (Scheme 1b). [2b,7] Therefore, in order to achieve 3D stretchable supercapacitors with simultaneous improved specific areal specific capacity and stretchability, the critical challenge is to design thicker supercapacitors with device-thickness-independent ion transport path and good stretchability.The honeycomb lantern is made by attaching pieces of paper with adhesives into a 3D stretchable artefact, with an internally Traditional stretchable supercapacitors, possessing a thin electrode and a 2D shape, have limited areal specific areal capacitance and are incompatible with 3D wearables. To overcome the limitations of 2D stretchable supercapacitors, it is highly desirable to develop 3D stretchable supercapacitors with higher mass loading and customizable shapes. In this work, a new 3D stretchable supercapacitor inspired by a honeycomb lantern based on an expandable honeycomb composite electro de composed of polypyrrole/black-phosphorous oxide electrodeposited on carbon nanotube film is reported. The 3D stretchable supercapacitors possessing device-thickness-independent ion-transport path and stretchability can be crafted into customizable device thickness for enhancing the specific areal energy storage and integrability with wearables. Notably, a 1.0 cm thick rectangular-shaped supercapacitor shows...

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Section: Methodsmentioning

confidence: 99%

Honeycomb‐Lantern‐Inspired 3D Stretchable Supercapacitors with Enhanced Specific Areal Capacitance

et al. 2018

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“…The gravimetric, areal and volumetric energy densities of the 3D-printed AC/CNT/rGO-1, 2, 4, and 10 symmetric supercapacitors as a function of scan rate were summarized in Figures S20-S22 (Supporting Information). In general, our assembled ultrathick AC/CNT/rGO-10 symmetric supercapacitor can deliver a maximum areal energy density of 0.63 mWh cm −2 , which compares favorably with many advanced energy storage devices, such as a-MEGO, [37] F-GRF, [38] CAEGO, [39] PANI/N-C/SS, [40] Ni 3 S 2 //Pen Ink, [41] NiCo(OH) 2 //Zn, [42] GO MSCs, [22] PPy-GA, [23] MnO 2 NWs@ CFC, [43] rGO@PPyNT, [44] Bi 2 O 3 //MnO 2 , [45] RGO/PEDOT:PSS, [46] Bi 2 O 3 NT5-GF, [47] VO x /rGO//G-VNQDs/rGO, [26] CNT// CNT, [48] Pd-TRGO, [49] and AC//AC symmetric/asymmetric cells (Figure 5d). [50] Meanwhile, benefiting from the compact electrode architecture and abundant hierarchical pores, the volumetric energy density of the 3D-printed ultrathick AC/CNT/ rGO-10 symmetric supercapacitor can reach 1.43 mWh cm −3 , which is superior than those recently reported supercapacitors, such as CNT//CNT, [48] LSG-EC, [51] Ti 3 C 2 T x paper, [52] VN// VO x , [53] MVNN/CNT, [54] Ni/MnO 2 //Ni/AC, [55] α-Fe 2 O 3 @PANI// PANI, [56] MnO 2 //C, [57] MPG-MSCs, [58] C/MnO 2 , [59] 3D-GCA SSC, [18] PPy-GA, [23] NCF-SSC, [60] K 2 Co 3 (P 2 O 7 ) 2 ·2H 2 O//Graphene, [61] and GRO-PE fMSC cells.…”

Section: Figure 1amentioning

confidence: 98%

3D Printing of Tunable Energy Storage Devices with Both High Areal and Volumetric Energy Densities

Gao

Zhou

et al. 2018

Advanced Energy Materials

149

134

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materials play a determined role in offering high performance for supercapacitors. There are usually two ways to enhance the electrochemical performance of supercapacitors. One is exploring new electrode materials with high surface area and conductivity, such as advanced carbonbased materials, and the other one is constructing reasonable electrode structure with unimpeded electron and ion pathways. [4][5][6][7][8] To date, many efforts have been dedicated to developing a variety of carbonaceous materials with different morphologies, such as CNT, AC, graphene, carbon nanofibers, whereas less attention has been focused on the optimization of carbon-based electrode structures. [9][10][11][12][13] How to properly design and regulate the electrode microstructures (electrode architecture engineering) based on the existed materials using advanced fabrication and assembly methods to further optimize the performance is also of great significance.A few fabrication and assembly methods, such as vacuum filtration, [14] freeze-casting, [15] solvothermal gelation, [16] and chemical vapor deposition (CVD), [17] have been proposed to adjust the carbon-based electrode architectures. However, for the CVD method, it is expensive and not scalable, and the obtained electrode structures are generally fragile. The electrode architecture prepared by the vacuum filtration, freeze-casting and solvothermal gelation is largely stochastic and highly tortuous, which greatly hinders electrolyte ion transport. Thus, the controllable and scalable electrode fabrication with tailored architectures remains a great challenge. [18] The extrusion-based Developing advanced supercapacitors with both high areal and volumetric energy densities remains challenging. In this work, self-supported, compact carbon composite electrodes are designed with tunable thickness using 3D printing technology for high-energy-density supercapacitors. The 3D carbon composite electrodes are composed of the closely stacked and aligned active carbon/carbon nanotube/reduced graphene oxide (AC/CNT/rGO) composite filaments. The AC microparticles are uniformly embedded in the wrinkled CNT/rGO conductive networks without using polymer binders, which contributes to the formation of abundant open and hierarchical pores. The 3D-printed ultrathick AC/CNT/rGO composite electrode (ten layers) features high areal and volumetric mass loadings of 56.9 mg cm −2 and 256.3 mg cm −3 , respectively. The symmetric cell assembled with the 3D-printed thin GO separator and ultrathick AC/CNT/rGO electrodes can possess both high areal and volumetric capacitances of 4.56 F cm −2 and 10.28 F cm −3 , respectively. Correspondingly, the assembled ultrathick and compact symmetric cell achieves high areal and volumetric energy densities of 0.63 mWh cm −2 and 1.43 mWh cm −3 , respectively. The all-component extrusion-based 3D printing offers a promising strategy for the fabrication of multiscale and multidimensional structures of various high-energy-density electrochemical energy storage devices. 3D-Printed S...

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“…Several carbon nanostructures with good mechanical properties, excellent electrical conductivity, excellent chemical resistance, and high SSA, such as carbon nanotube (CNT) and graphene, have been employed. Individual CNT has a strength of over 10 GPa (reported also to be as high as 100 GPa) and a modulus of over 320 GPa, and graphene has a strength of over 12 GPa and a modulus around 1 TPa .…”

Section: Introductionmentioning

confidence: 99%

“…Although the individual CNT and graphene have excellent mechanical properties, the structural performance of the electrode made with graphene and CNT is still far from the ideal; the specific capacitance and strength of graphene and CNT‐based electrode from literature are summarized in Figure . Plain graphene electrodes usually show a tensile strength less than 10 MPa 8a,d. Many researchers attempt to improve the mechanical properties of graphene electrodes by adding reinforcement and binders 8b,c,12.…”

Section: Introductionmentioning

confidence: 99%

Promising Trade‐Offs Between Energy Storage and Load Bearing in Carbon Nanofibers as Structural Energy Storage Devices

Chen

Amiri

Boyd

et al. 2019

Adv Funct Materials

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Structural energy storage materials refer to a broad category of multifunctional materials which can simultaneously provide load bearing and energy storage to achieve weight reduction in weight-sensitive applications. Reliable and satisfactory performance in each function, load bearing or energy storage, requires peculiar material design with potential trade-offs between them. Here, the trade-offs between functionalities in an emerging class of nanomaterials, carbon nanofibers (CNFs), are unraveled. The CNFs are fabricated by emulsion and coaxial electrospinning and activated by KOH at different activation conditions. The effect of activation on supercapacitor performance is analyzed using two electrode test cells with aqueous electrolyte. Porous CNFs show promising energy storage capacity (191.3 F g −1 and excellent cyclic stability) and load-bearing capability (σ f > 0.55 ± 0.15 GPa and E > 27.4 ± 2.6 GPa). While activation enhances surface area and capacitance, it introduces flaws in the material, such as nanopores, reducing mechanical properties. It is found that moderate activation can lead to dramatic improvement in capacitance (by >300%), at a rather moderate loss in strength (<17%). The gain in specific surface area and capacitance in CNFs is many times those observed in bulk carbon structures, such as carbon fibers, indicating that activation is mainly effective near the free surfaces and for low-dimensional materials.

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Multilayer‐Folded Graphene Ribbon Film with Ultrahigh Areal Capacitance and High Rate Performance for Compressible Supercapacitors

Cited by 163 publications

References 66 publications

Honeycomb‐Lantern‐Inspired 3D Stretchable Supercapacitors with Enhanced Specific Areal Capacitance

Honeycomb‐Lantern‐Inspired 3D Stretchable Supercapacitors with Enhanced Specific Areal Capacitance

3D Printing of Tunable Energy Storage Devices with Both High Areal and Volumetric Energy Densities

Promising Trade‐Offs Between Energy Storage and Load Bearing in Carbon Nanofibers as Structural Energy Storage Devices

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