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MINI REVIEW article

Front. Mater., 26 March 2020
Sec. Energy Materials
This article is part of the Research Topic Chemistry, Synthesis, and Interaction of Advanced Electrolyte Materials for High-Energy-Density Batteries View all 8 articles

Recent Progress in Textile-Based Flexible Supercapacitor

\r\nAwais Sattar Ghouri*Awais Sattar Ghouri1*Rabya AslamRabya Aslam2Muhammad Saqib SiddiquiMuhammad Saqib Siddiqui3Syed Kamran SamiSyed Kamran Sami1
  • 1Department of Chemical Engineering, Faculty of Engineering & Architecture, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, Pakistan
  • 2Institute of Chemical Engineering & Technology, University of the Punjab, Lahore, Pakistan
  • 3Department of Textile Engineering, Faculty of Engineering & Architecture, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, Pakistan

In the backdrop of the growing requirement of flexible and wearable energy storage systems, textile-based supercapacitors having characteristic flexibility, superior charging-discharging rates, and low cost are ideal energy storage devices for wearable applications. Lightweight and flexible textile-based supercapacitors characterized by high conductivity, thermal, and environmental stability with negligible degradation under repeated use are required for multifunctional wearable electronics. Herein, supercapacitor based upon textile fabrics will be reviewed from the perspective of electrochemical, mechanical, and thermal properties without compromising flexibility, durability, and comfort of textile fabric.

Introduction

Today, the world is facing overwhelming concerns pertaining to environmental pollution and energy shortage due to increased demand for energy consumption. The fulfillment of the energy needs by continuous reliance on conventional fossil fuels has reduced the energy sources significantly (González et al., 2016). These problems can be very well managed by proper utilization of clean and renewable energy sources like geothermal energy, wind energy, solar energy, and ocean energy but require feasible geographical distribution coupled with reliable, durable, efficient, and cost-effective energy storage technology (Xu et al., 2019).

In this regard, batteries are deemed as a promising alternative for power sources and energy storage systems. Although batteries have good energy capabilities but suffer from a series of drawbacks such as sluggish irreversible chemical reaction, low specific power, poor cycling performance, and inferior charge-discharge rate capability (González et al., 2016; Muzaffar et al., 2019; Yu and Feng, 2019). For flexible and wearable healthcare and portable electronic devices, supercapacitors have emerged as a superior alternative having enhanced energy storage capability ranging from a hundred to many thousands in the same volume as compared to batteries (Lee et al., 2013; González et al., 2016). Although the power output of the supercapacitor is comparatively low but possesses higher specific energy than a traditional electrolytic capacitor. A supercapacitor is bridging up the performances of both electrolytic capacitors and batteries. Supercapacitor offers long charge-discharge cycling stability and can withstand millions of cycles with sound coulombic efficiency without much decay in performances (González et al., 2016; Cheng et al., 2018; Muzaffar et al., 2019; Yu and Feng, 2019).

Rapid development in modern digital communication, smart electronic devices for healthcare and wearable applications have augmented demand toward the formulation and design of improved and better flexible energy storage systems. To further enhance the characteristics of a supercapacitor, extensive efforts have been dedicated to the facile fabrication of supercapacitors with advanced materials (Lima et al., 2019).

Meanwhile, Fiber and fabric-based materials are being researched and employed as potential ingredients for supercapacitor applications. Textile-based flexible supercapacitors are lightweight, flexible, economical, and viable alternative to their conventional rigid and bulky counterparts. Due to having congenital flexibility and small volume, textile-based can be transformed into various shapes and structures, which in turns supports its integration with miniaturized futuristic wearable electronic devices and gadgets through well-established textile manufacturing technologies (Lee et al., 2013; Gulzar et al., 2016; Hong et al., 2019).

Textile-Based Flexible Supercapacitor

To cope up with the issues related to flexibility, wearability, and durability, research in respect of making the combination of supercapacitors with flexible textile fabric is bringing a revolution in our lives due to its lightweight, cost-effectiveness, human-safe usage, flexibility, comfort, and good electrochemical performance.

Concomitantly, utilization of flexible substrate for supercapacitor fabrication with the capacity to accommodate stretching, deformation, and bending is springing up with a rapid pace and potential utilization of new and advanced materials with diverse properties is being explored and harnessed.

In consequence, the production of more efficient textile-based supercapacitors with a number of novel features and functions must be focused for next-generation flexible electronics (Liu et al., 2015).

A new asymmetric supercapacitor prepared from a composite of horizontally aligned carbon nanotube array (HACNTs) and poly (3-methylthiophene) (P3MT) depicted high areal capacitance of 3.1F cm−2 at 5mA cm−2 and sustained the areal capacitance of 1.8F cm−2 even at the current density of 200mA cm−2. Although little structural change observed during the charge/discharge process due to change in volume of conducting polymer under high strain in as-prepared supercapacitor performance but shows good electrochemical and mechanical stability of electrode material (Zhou et al., 2019). Cheng et al. prepared high-performance flexible supercapacitor consisting of PANI/SWCNT/cloth composite electrode, which delineated specific capacitance of 410 Fg–1 and good cycle life and stability similar to other electrodes (Wang et al., 2011). The energy density of 6.6Whkg−1 is being observed at power density of 7,000Wkg−1. It is important to note that, at the same power density PANI/SWCNT/cloth depicts high energy density, rate capability, stability, and capacitance than supercapacitor made from PANI/cloth and SWCNT/cloth-based electrode. The obtained results enlighten the potential utilization of PANI/SWCNT/cloth-based supercapacitor for flexible and wearable applications (Cheng et al., 2018).

Cotton cloth is known for its intrinsic porosity, hydrophilicity, and flexibility. A low-cost all-solid-state and flexible supercapacitor using cotton cloth has been developed by Wang et al. via the facile electroplating method. In their work, cotton cloth is initially made conductive by sputtering 99.99% pure Copper (Cu) and subsequent electrodeposition of tremella-like nickel-cobalt-sulfide (Ni-Co-S) nanoflakes on it. An asymmetric supercapacitor containing Ni-Co-S as the cathode, activated carbon as the anode, and PVA/KOH as the solid-state electrolyte has been fabricated. The as-fabricated asymmetric flexible supercapacitor displayed the energy density of 48.9W h kg−1 at 390W kg−1 with capacitance retention of 70% after 5,000 cycles. The developed textile-based asymmetric flexible supercapacitor with good rate capability, bendability, and flexibility possesses practical applications in wearable energy storage devices (Wang et al., 2020).

Wearable Applications of Textile-Based Flexible Supercapacitor

Applicability of supercapacitor in the field of wearable electronics with a diverse application is being focused on research works with an aim to explore its energy storage performance. Most recently, high-performance textile electrodes by applying a coating of polypyrrole (PPy) using improved in situ polymerization technique have been developed with a resistance less than 10Ωcm−2 and the highest capacitance of 4848mFcm−2 at 1mAcm−2. Increased resistance of fabric was observed using water washing but depicted unchanged conductivities using dichloromethane as a washing agent even after 20 laundering cycles. Further, no alteration in conductivity occurred during mechanical deformation, sewing, and cutting process (Lv et al., 2019b).

Similarly, in their subsequent work, polypyrrole (PPy) was coated on knitted cotton fabric using improved in situ chemical polymerization technique. Three samples were prepared using a molar ratio of pyrrole monomer to ferric trichloride hexahydrate (FeCl3.6H2O) of 0.5, 1, and 2. The prepared textile electrode samples were named as PPy-0.5, PPy-1, and PPy-2, respectively. As compared to PPy-0.5 and PPy-1, PPy-2 textile electrode exhibited superior conductivity and high mass loading of active material. PPy-2 fabric electrode showed specific areal capacitance of 5073mFcm−2 at 1mAcm−2 with excellent flexibility and cycle stability. In addition, an all-solid-state symmetric supercapacitor was fabricated using two PPy-2 fabric electrodes, LiCl/PVA gel electrolyte, a cellulosic separator (TF4030, NKK), and two silver foils. The fabricated symmetric all-solid-state supercapacitor demonstrated high specific areal capacitance of 1167.9mFcm−2 and 904.2mFcm−2 at 1mAcm−2 and 20  mA  cm−2, respectively. The supercapacitor has displayed energy density and power density of 102.4μWhcm−2 and 0.39mWcm−2, respectively. The resultant electrochemical performance enables the transformation of textile-based supercapacitors into wearable energy storage devices (Lv et al., 2019a).

All-solid-state flexible supercapacitor based upon carbon woven fabric/PANI/graphene composite having appealing potential for wearable applications has been fabricated using in situ growth and wrapping method, displaying a high areal capacitance (790Fcm−2) at a current density of 1Acm−2 and high areal energy of 28.21uWhcm−2 at a power density of 0.12mWcm−2 under bending conditions. In the as-assembled flexible supercapacitor, graphene improved the flexibility, performance, and conductivity of the electrode. In addition, rGO nanosheets combined well with PANI particle limiting volume change during charge/discharge cycles by exhibiting enhanced stability with 88.9% capacitance retention (Lin et al., 2018). In the work of Ismail and coworkers, a flexible electrode for supercapacitor having cycling stability up to 35,000 cycles have been synthesized by dipping and drying method using carbon nanotubes cotton super-fiber. The CNT cotton super-fiber can be twisted and woven into fiber and fabric, respectively. The prepared CNT cotton super-fiber based supercapacitor has superior flexibility, strength, electric, and thermal conductivity (Ismail et al., 2019).

All-solid-state supercapacitor (ASSSC) having great potential for wearable energy storage devices has been developed by Wang and coworkers by facile in situ chemical polymerization method using polypyrrole and knitted cotton fabric as substrate. ASSSC exhibited good stretching stability and hydrophobicity with a water-contact-angle above 133°. The ASSSC displayed areal capacitance of 450mFcm−2 @ 5mVs−1 and 1mAcm−2, energy density and power density of 0.4Whcm−2 and 10Wm−2, respectively. Even under 40% strain, stretching of 1,000 times, ASSSC maintained initial capacitance about 78–91% at different current densities and depicted an increase in areal capacitance of 160% @ 5mAcm−2. Apart from above, ASSC set backed in cycling stability using gel electrolyte primarily due to expulsion of moisture from gel electrolyte, resulting in the retention of 30% of initial capacitance after 500 cycles. On the other hand, retention of 53% of initial capacitance at 5,000th cycles was observed, when aqueous electrolyte was used (Wang et al., 2019a). Textile-based flexible supercapacitor for wearable application has been developed by Lima and coworkers using graphene nanoplatelets/CNT/polypyrrole composite on cotton electrode exhibiting good cyclability, high specific capacitance of 45.5Fg−1, and capacitance retention of 70% after 2,000 cycle of use. The electrochemical performance of the prepared flexible supercapacitor is better than CNT/polypyrrole composite-based flexible supercapacitor. Further, varying relative proportions of GNP/CNT ratio also improved the electrochemical performance of as-prepared flexible supercapacitor (Lima et al., 2019).

A hierarchical wearable solid-state supercapacitor yarn for electrode preparation with excellent volumetric energy density and power density has been synthesized using graphene-metallic textile composite. The prepared rGo/Ni cotton yarn presented enhanced combined capacitance, high energy and power density, exceptional mechanical durability, and superior flexibility having huge potential for scalability because of ease of material synthesis and device fabrication. Using embroidery and weaving techniques, rGo/Ni cotton yarn can be integrated into the wearable application. The rGo/Ni cotton yarn supersedes the electrochemical performance of other available yarn-based supercapacitor due to having a large surface area of active material and providing enough excess to the electrolyte to form an electric double layer. In principle, the fabricated rGo/Ni cotton yarn-based supercapacitor can be well amalgamated with other textile scaffolds and active materials and can be used as effective and efficient energy-storage devices for next-generation flexible, portable, and wearable electronics (Liu et al., 2015).

Sami et al. fabricated lightweight and flexible all-solid-state 1D-1D hybrid supercapacitor composed of zinc oxide nanorods @ PEDOT:PSS coated electrospun P(VDF-TrFE) nanofibers exhibiting gravimetric specific capacitance of 59.55Fg−1 and 56.99Fg−1 determined from cyclic voltammogram and galvanostatic charge-discharge curve. The high areal capacitance of 1.22mFcm−2at the current density of 0.1mAcm−2indicates the possibility of developing a next-generation integrated flexible power source for wearable applications. Moreover, excellent rate capability and mechanical robustness ascertain its usability for high performance flexible energy storage devices (Sami et al., 2017). A flexible textile-based supercapacitor with good flexibility and specific capacitance of 578Fg−1 at scan rate of 5mVs−1 has been developed by incorporating vertical array of Co-Ni layered double hydroxide (Co-Ni LDH) on conductive graphene/cotton fabric (G/CF) by a chemical deposition method. The prepared Co-Ni LDH/G/CF has a significant impact on developing flexible energy storage devices for wearable applications (Wang et al., 2019b).

Design Strategies for Textile-Based Flexible Supercapacitor

Textile fabric can be made conductive by applying a suitable coating of conducting polymers on them. Conductive fabric offers good electrochemical properties and is therefore well suited for diverse applications ranging from smart textiles to energy storage purposes. This is because conventional textiles have their own innate breathability, pliability, conformability, and wearability. Recently, a simple and scalable interface engineering processing has been developed for exfoliating graphene nanoplatelets (GNP) on polyamide fabric using a low boiling solvent. After 4 h of coating, the resultant GNP/polyamide fabric displayed a decrease in surface resistivity from infinity (∞) to 40kΩ. Further, the minimal effect on fabric crystallinity and uniform coating of GNP nanoplatelets on polyamide fabric has been confirmed by XRD and SEM results, respectively. This interface engineering approach is used for coating any polymeric fabric to produce E-textile related material (Barjasteh et al., 2019).

Several flexible heating devices based upon polypyrrole/cotton fabric are being prepared by variable pyrrole/FeCl3 molar concentrations. It has been noted that flexible heating devices displayed low resistivity, i.e., 0.37Ωcm, better tensile strength than raw cotton fabric, i.e.,  58MPa (as shown in Figure 1). In contrast to the tensile strength of the raw cotton fabric, i.e., 8.9MPa, the improvement in tensile strength of PPy/composites, i.e., 58MPa is not significantly affected by Py/FeCl3 concentration ratios but is attributed to the attachment of PPy on the cotton fabric. Further, the electrothermal performance of prepared PPy/cotton composites was presented in the temperature-time curve of Figure 2 under different Py/FeCl3 concentration ratios and voltage inputs (1−16V). It is depicted from the temperature-time curve in Figure 2 that the temperature of PPy/cotton composites rises sharply within few seconds under certain voltage input, and after attaining peak value, the temperature remains almost constant throughout the heating period. The higher the temperature rise, the slower it drops to room temperature. It is noted that PPy/cotton composites quickly reach the temperature value of 168.3°C after 3 min at the applied voltage of 5 V, whereas, the capability of PPy/cotton composites strongly depends upon high conductivity under certain input voltage. In the context of the above results, the flexible heating devices exhibit good electric, mechanical, and thermal properties. It is also expected that an as-prepared flexible heating device can be well integrated with the fabric-based supercapacitor (Xie et al., 2019).

FIGURE 1
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Figure 1. Tensile properties of raw cotton (warp) and PPy/cotton composites with different Py/FeCl3 ratios. Reproduced from Xie et al. (2019) under the Creative Commons CC-BY license.

FIGURE 2
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Figure 2. Temperature–time curve changes of PPy/cotton composites with different Py/FeCl3 ratios (A) 1:4, (B) 1:1, (C) 1:2, (D) 2:1, (E) 3:1, and (F) 4:1 at different applied voltages of 1–16 V. Reproduced from Xie et al. (2019) under the Creative Commons CC-BY license.

In addition, the utilization of flexible and wearable supercapacitor in electronic textile and energy storage system is on the upswing. In contrast to conductive fabric, fibers, threads, and yarns are also being made conductive by means of applying the coating of conducting polymers using numerously available and well-established coating techniques. As consistent with above, Lee et al. have prepared electrode material having high energy density, power density, and cycle life for redox supercapacitor using a novel gradient biscrolling process. In this technique, hundreds of carbon nanotubes infiltrated by conducting polymers were scrolled into ∼20μm diameter yarn. Subsequently, scrolled yarn was plied with metal wires to enhance its power generation capability. The resultant electrode material for supercapacitor exhibited volumetric capacitance of ∼179Fcm−3 and discharge current for the plied yarn displayed a linear rise with a voltage scan rate of ∼20Vs−1 and ∼80Vs−1for solid and liquid electrolytes, respectively (Lee et al., 2013).

Successful commercialization of smart electronic textile and textile-based supercapacitor relies upon flexible and wearable substrates, whereas, traditional electrochemical energy storage devices are too bulky and rigid to be used for the said purpose. Much of the practical efforts have been dedicated to developing fiber/fabric-based supercapacitor but, still needs focused work in respect of supercapacitor stability, scalability, wearability, and fabrication efficiency. From this perspective, the one-step wet spinning method with a high degree of production rate, i.e., 118 m/h for developing supercapacitor fiber having sound electrochemical properties has been proposed by Hong et al. The unique two-circle-in-one-circle structural design of supercapacitor fiber displays good electrochemical stability on bending for 105 cycles and can be woven into a flexible and wearable power scarf and fabric. In general, this facile and scalable synthesis approach can pave the way for designing fiber-shaped healthcare devices, solar cells, batteries, sensors, etc (Hong et al., 2019).

For the first time, Cheng et al. have reported the fabrication of novel textile-based flexible supercapacitor using a conventional dyeing process following the coating of PEDOT:PSS on PET fabric. In this study, organic dyes, i.e., C.I. Disperse Blue 79 (DB 79) and C.I. Disperse Red 60 (DR 60) was absorbed on the PET fabric using a well-known textile dyeing process to improve capacitance performance of the fabric, whereas, the poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) solution was coated on dyed PET fabric by the spray-coating method to enhance the conductivity of the fabric. It was noted that the introduction of organic dyes on the PET fabric can ameliorate the electrochemical performance of PEDOT:PSS-coated PET Fabric. It is worth noting that DB 79 improved the areal capacitance of fabric from 50.92mFcm−2 to 74.99mFcm−2 at the current density of 0.5mAcm−2. Meanwhile, the assembled symmetric supercapacitor based upon PEDOT:PSS@DR60@PET fabric electrode displayed the energy density of 4.10mWhcm−2 at 400.03mWcm−2 with capacitance retention of 87% after 200 cycles. The assembled all-organic supercapacitor can power an LED, demonstrating its potential application in wearable electronics (Cheng et al., 2020).

Commercial polyester conductive fabric coated with nickel and copper (PCF) is used as a composite electrode for flexible supercapacitor by Qi and coworkers. In this work, Qi et al. firstly prepared composite fabric electrode by physically depositing graphene oxide (GO) followed by thermal and ascorbic acid-assisted reduction of graphene oxide. Subsequently, a uniform layer of nickel-cobalt layered double hydroxide (Ni-Co LDH) having 1.4 μm thickness is electrodeposited on reduced graphene oxide (rGo) surface. The NiCo−LDH@rGoPCF composite electrode exhibits specific capacitance of 1220.5Fg−1 at the current density of 1Ag−1 with capacitance retention of 84.1% after 5,000 cycles at the current density of 8Ag−1. An asymmetric flexible supercapacitor containing Fe2O3/N−rGo as the cathode, NiCo−LDH@rGoPCF as the anode, and PVA-KOH as the solid-state electrolyte have been fabricated. The as-fabricated asymmetric flexible supercapacitor displayed the energy density of 61.1Whkg−1 at 856.1Whkg−1 with remarkable cycling stability of 90.6% capacitance retention after 5,000 cycles. The prepared asymmetric flexible supercapacitor has a significant impact on developing flexible energy storage devices for wearable applications (Qi et al., 2020). To this end, commendable efforts have been dedicated in the fabrication of flexible supercapacitor electrodes based upon waste cotton fabric, carbon woven fabric, carbonized cotton fabric, activated carbon fabric by many researchers for high energy storage applications (González et al., 2016; Kim et al., 2018; Ippili et al., 2019; Jin et al., 2019; Lin et al., 2019; Reece et al., 2019; Wang et al., 2019c; Xu et al., 2019).

Conclusion and Future Perspectives

Keeping in view widespread applications of flexible supercapacitor in wearable electronics, modification methodologies in respect of fabrication, electrochemical performance, choosing reliable and smart advanced materials, electrolyte selection, etc. are being discovered to bring forward lightweight and flexible supercapacitor owing high energy and power density, safe and easy operation in conjunction with good interface with human posture (Lin et al., 2018). Therefore, the need of the time is to develop a cost-effective and efficient energy storage system by keeping in view the latest available technological aspects, which can deliver high power and high energy rates. In view of the above, still, the textile-based fabric has the capability of being further explored and tested as a good ingredient for supercapacitors. Previously, textile-based supercapacitors having both synergetic effects of electric double-layer capacitance combined with pseudocapacitance of conducting polymers have not been reported yet. Although, work has been done regarding incorporation of conducting polymer on polyimide (PI) matrix, which gave better results related to thermal, mechanical, environmental stability along with excellent electroactivity (Arbizzani et al., 1996; González et al., 2016), but the same composite comprised of conductive polymers has not been tested upon any textile fabric for supercapacitor applications. In addition, the incorporation of stretchable electrodes having improved electrochemical performance of power/energy density must be focused for tangible outcomes. Low energy density observed in wearable textile-based flexible supercapacitors can be well addressed by extending the working potential window, which can be done by exploring new and improved electrolytes, whereas, appropriate chemical modification of electrode can enhance specific capacitance of textile-based flexible supercapacitor (Lima et al., 2019). Preparation of ameliorated conducting polymer composite having superior and tunable conductivities and flexibility is a feasible key factor in bringing about desired and improved electrochemical characteristics in textile-based flexible supercapacitor (Le et al., 2017).

Author Contributions

AG, RA, MS, and SS contributed equally in mini review article write-up.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

I feel extremely grateful to my colleagues who supported me extensively throughout the work and provided their valuable and expert opinion on each topic.

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Keywords: flexible supercapacitor, textile fabric, wearable applications, energy storage, conducting polymer

Citation: Ghouri AS, Aslam R, Siddiqui MS and Sami SK (2020) Recent Progress in Textile-Based Flexible Supercapacitor. Front. Mater. 7:58. doi: 10.3389/fmats.2020.00058

Received: 28 December 2019; Accepted: 26 February 2020;
Published: 26 March 2020.

Edited by:

Cheng Zhong, Tianjin University, China

Reviewed by:

Bin Liu, Tianjin University, China
Huanan Duan, Shanghai Jiao Tong University, China

Copyright © 2020 Ghouri, Aslam, Siddiqui and Sami. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Awais Sattar Ghouri, ghouriasg@gmail.com

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.