A study of low-temperature solid-state supercapacitors based on Al-ion conducting polymer electrolyte and graphene electrodes

Liu, Jianghe; Khanam, Zeba; Ahmed, Sultan; Wang, Hengtai; Wang, Ting; Song, Shenhua

doi:10.1016/j.jpowsour.2021.229461

Cited by 46 publications

(25 citation statements)

References 81 publications

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“…The electrochemical performance of the prepared electrode materials displays a superior energy–power feature in comparison to some advanced carbon‐based materials reported in recent literatures. [ 10,15,18,36,38,50,51 ] All of these reveal that the as‐prepared SACA‐350//SACA‐350 device is an efficient supercapacitor.…”

Section: Resultsmentioning

confidence: 97%

“…[5][6][7] However, the relatively low energy density of the supercapacitors is still the main obstacle to their wide range of commercial applications. [8][9][10] Consequently, how to enhance the energy density of carbon-based supercapacitors without sacrificing power density has attracted considerable attention.The specific capacitance and rate capability of supercapacitors, or more intuitively, the number of adsorbed charges and the rate of electron transfer, are mainly controlled by the electrode materials. [11][12][13] To achieve excellent electrochemical performance, the desirable carbon electrode materials of the supercapacitors should possess large specific surface area (SSA), adjustable pore structure/rational hierarchical porosity, and outstanding interface activity, so that it can achieve more efficient absorption, transfer and infiltration of the electrolyte ion.…”

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confidence: 99%

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confidence: 99%

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Pore‐ and Heteroatom‐Controlled Superabsorbent‐Resin‐Derived Carbon Aerogels for Supercapacitors via Adjusting the Methylene Blue Concentration

Dai

Ren

Chen

et al. 2021

Adv Materials Inter

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rapid charging characteristics, long cyclic life, and high power density. [5][6][7] However, the relatively low energy density of the supercapacitors is still the main obstacle to their wide range of commercial applications. [8][9][10] Consequently, how to enhance the energy density of carbon-based supercapacitors without sacrificing power density has attracted considerable attention.The specific capacitance and rate capability of supercapacitors, or more intuitively, the number of adsorbed charges and the rate of electron transfer, are mainly controlled by the electrode materials. [11][12][13] To achieve excellent electrochemical performance, the desirable carbon electrode materials of the supercapacitors should possess large specific surface area (SSA), adjustable pore structure/rational hierarchical porosity, and outstanding interface activity, so that it can achieve more efficient absorption, transfer and infiltration of the electrolyte ion. [14][15][16][17][18] Since the smaller pore size of the electrode material is conducive to the higher SSA, massive micropores and mesopores should be introduced to the electrode materials, in order to provide abundant adsorbed sites for charged ions. [19,20] However, the markedly reduced pore size will result in the impermeability of electrolyte ions among the near-confined pores, thus significantly decrease the electrochemical performance. Hence, the optimization of the pore structure and the regulation of the pore distribution are key strategies to improve the device performance.Heteroatom doping of carbon materials can also greatly impact the electrochemical performance of the supercapacitors. [21][22][23] On one hand, the heteroatoms including oxygen (O), nitrogen (N), sulfur (S), and phosphorus (P) elements can increase the total capacitance of supercapacitors by inducing pseudocapacitance in Faradaic redox processes. On the other hand, the decoration of O/N/S functional groups on the surface of the microporous and mesoporous carbon materials can considerably accelerate the migration of aqueous electrolyte ions by decreasing the migration resistance. [5,8] Thus, in order to fabricate high-performance supercapacitors, it is extremely necessary to design a kind of electrode materials with adjustable pore structure, rational hierarchical porosity, and appropriate heteroatom doping. Despite that the pore engineering and elemental doping have been demonstratedThe porous structure and heteroatom doping are crucial for the electrochemical performance of carbon materials for supercapacitors. However, designing carbon materials with appropriate pore sizes and heteroatom content is still facing daunting challenges. Herein, simultaneous regulation of porous structure and heteroatom doping in superabsorbent resin (SAR)-based activated carbon aerogels (SACAs) is implemented by facilely immersing superabsorbent resin in methylene blue (MB) solution with different concentrations, and then followed by freeze-drying and carbonization. The resulting SACAs possess variable oxygen/nitro...

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Section: Resultsmentioning

confidence: 97%

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confidence: 99%

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Pore‐ and Heteroatom‐Controlled Superabsorbent‐Resin‐Derived Carbon Aerogels for Supercapacitors via Adjusting the Methylene Blue Concentration

Dai

Ren

Chen

et al. 2021

Adv Materials Inter

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“…Moreover, polymer-based gel electrolytes are usually difficult to use at low temperatures due to the low ionic conductivity of the gel state at low temperatures. [25][26][27][28] In this study, after GO modification, oxygen-containing functional groups of GO could accelerate Li + transport, thereby enabling their application at a low temperature of −15°C, with 92.7% of its room-temperature capacity. In addition, as GPEs are spun directly to the surface of electrodes, the interface affinity between the electrodes and the GPEs is significantly improved.…”

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confidence: 88%

Fibrous gel polymer electrolyte for an ultrastable and highly safe flexible lithium‐ion battery in a wide temperature range

Shen

et al. 2021

Carbon Energy

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Replacement of flammable liquid electrolytes with gel polymer electrolytes (GPEs) is a promising route to improve the safety of lithium-ion batteries (LIBs). However, polymer-based electrolytes have limited suitability at low/high temperatures due to the instability of the polymer at high temperatures and the low ionic conductivity of the gel state at low temperatures. Herein, an integrated design of electrodes/fibrous GPEs modified with graphene oxide (GO) is reported. Due to the integrated structure of electrodes/GPEs, the strong interface affinity between electrodes and GPEs ensures that the GPEs spun on electrodes do not shrink at high temperatures (160-180°C), thus preventing a short circuit of electrodes. Moreover, after GO modification, oxygen-containing functional groups of GO can accelerate Li + transport of GO-GPEs even at a low temperature of −15°C. When these GPEs are applied to flexible LIBs, the LIBs show excellent electrochemical performance, with satisfactory cycling stability of 82.9% at 1 C after 1000 cycles at 25°C. More importantly, at a high temperature of 160°C, the LIBs can also discharge normally and light the green light-emitting diode. Furthermore, at a low temperature of −15°C, 92.7% of its roomtemperature capacity can be obtained due to the accelerated Li + transport caused by GO modification, demonstrating the great potential of this electrolyte and integrated structure for practical gel polymer LIB applications.flexible battery, gel polymer electrolyte, graphene oxide, safe lithium-ion battery | INTRODUCTIONFlexible electronics have received considerable attention in recent years. These devices are part of our daily lives and are of interest in the development of futuristic electronics. 1,2 Flexible electronics should be flexible, bendable, or naturally foldable for integration with the human body to develop the ubiquitous applications that are considered as the next-generation revolution. [3][4][5] The technology trends of flexible electronics may advance

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“…While they have good mechanical properties and are very suited to flexible devices, the solid electrolytes typically show low ionic conductivity and overall performance. Gel polymer electrolytes (GE) are a great compromise between Molecules 2021, 26, 2631 2 of 12 the liquid and solid, have relatively good mechanical properties, are lightweight, can be packaged easily, and can have higher ionic conductivity than the solids [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Nano Carbon Doped Polyacrylamide Gel Electrolytes for High Performance Supercapacitors

et al. 2021

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Novel polyacrylamide gel electrolytes (PGEs) doped with nano carbons with enhanced electrochemical, thermal, and mechanical properties are presented. Carboxylated carbon nanotubes (fCNTs), graphene oxide sheets (GO), and the hybrid of fCNT/GO were embedded in the PGEs to serve as supercapacitor (SC) electrolytes. Thermal stability of the unmodified PGE increased with the addition of the nano carbons which led to lower capacitance degradation and longer cycling life of the SCs. The fCNT/GO-PGE showed the best thermal stability, which was 50% higher than original PGE. Viscoelastic properties of PGEs were also improved with the incorporation of GO and fCNT/GO. Oxygen-containing functional groups in GO and fCNT/GO hydrogen bonded with the polymer chains and improved the elasticity of PGEs. The fCNT-PGE demonstrated a slightly lower viscous strain uninform distribution of CNTs in the polymer matrix and the defects formed within. Furthermore, ion diffusion between GO layers was enhanced in fCNT/GO-PGE because fCNT decreased the aggregation of GO sheets and improved the ion channels, increasing the gel ionic conductivity from 41 to 132 mS cm−1. Finally, MnO2-based supercapacitors using PGE, fCNT-PGE, GO-PGE, and fCNT/GO-PGE electrolytes were fabricated with the electrode-specific capacitance measured to be 39.5, 65.5, 77.6, and 83.3 F·g−1, respectively. This research demonstrates the effectiveness of nano carbons as dopants in polymer gel electrolytes for property enhancements.

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A study of low-temperature solid-state supercapacitors based on Al-ion conducting polymer electrolyte and graphene electrodes

Cited by 46 publications

References 81 publications

Pore‐ and Heteroatom‐Controlled Superabsorbent‐Resin‐Derived Carbon Aerogels for Supercapacitors via Adjusting the Methylene Blue Concentration

Pore‐ and Heteroatom‐Controlled Superabsorbent‐Resin‐Derived Carbon Aerogels for Supercapacitors via Adjusting the Methylene Blue Concentration

Fibrous gel polymer electrolyte for an ultrastable and highly safe flexible lithium‐ion battery in a wide temperature range

Nano Carbon Doped Polyacrylamide Gel Electrolytes for High Performance Supercapacitors

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