MnO2@KCu7S4 NWs hybrid compositions for high-power all-solid-state supercapacitor

Dai, Shuge; Hu, Chenguo; Yue, Xule; Cheng, Lei; Guo, Wang

doi:10.1016/j.jpowsour.2014.10.075

Cited by 34 publications

(7 citation statements)

References 43 publications

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“…Figure B shows the Ragone plot obtained from the total mass of active materials for both the positive and the negative electrodes. The result of Ragone plot for NaCl–AGAR showed a compatible performance compared with the recently reported MnO 2 based flexible supercapacitors. ,,− …”

Section: Results and Discussionsupporting

confidence: 63%

A Biodegradable Gel Electrolyte for Use in High-Performance Flexible Supercapacitors

Moon

Kim

Lee

et al. 2015

ACS Appl. Mater. Interfaces

170

115

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Despite the significant advances in solid polymer electrolytes used for supercapacitors, intractable problems including poor ionic conductivity and low electrochemical performance limit the practical applications. Herein, we report a facile approach to synthesize a NaCl-agarose gel electrolyte for use in flexible supercapacitors. The as-prepared agarose hydrogel consists of a three-dimensional chemically interconnected agarose backbone and oriented interparticular submicropores filled with water. The interconnected agarose matrix acts as a framework that provides mechanical stability to the gel electrolyte and hierarchical porous networks for optimized ion transport. The developed pores with the water filler provide an efficient ionic pathway to the storage sites of electrode. With these properties, the gel electrolyte enables the supercapacitor to have a high specific capacitance of 286.9 F g(-1) and a high rate capability that is 80% of specific capacitance obtained in the case of a liquid electrolyte at 100 mV s(-1). In addition, attributed to the simple procedure and its components, the gel electrolyte is highly scalable, cost-effective, safe, and nontoxic. Thus, the developed gel electrolyte has the potential for use in various energy storage and delivery systems.

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Section: Results and Discussionsupporting

confidence: 63%

A Biodegradable Gel Electrolyte for Use in High-Performance Flexible Supercapacitors

Moon

Kim

Lee

et al. 2015

ACS Appl. Mater. Interfaces

170

115

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show abstract

“…Figure g and Table S3 show a Ragone plot and the comparison of electrochemical performance for the recently reported all-solid-state-supercapacitors, respectively. From this result, it can be confirmed that our flexible IGPE supercapacitor has a compatible performance to those shown by other reported data. ,− ,− …”

Section: Results and Discussionsupporting

confidence: 89%

Highly Flexible and Stable Solid-State Supercapacitors Based on a Homogeneous Thin Ion Gel Polymer Electrolyte Using a Poly(dimethylsiloxane) Stamp

Lee

Song

Choi

et al. 2019

ACS Appl. Mater. Interfaces

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To achieve both high structural integrity and excellent ion transport, designing ion gel polymer electrolytes (IGPEs) composed of an ionic conducting phase and a mechanical supporting polymer matrix is one of the promising material strategies for the development of next-generation all-solid-state energy storage systems. Herein, we prepared an IGPE thin film, in which an ion-diffusing phase containing ionic liquids and lithium salts was bicontinuously intertwined with a cross-linked epoxy phase, using a silicon elastomer-based stamping method, thus producing a homogeneous IGPE-based thin film with low surface roughness (R rms = 0.5 nm). Following the optimization of the IGPE thin film in terms of the concentrations of ionic constituents, the film thickness, and various process parameters, the IGPE itself showed a high ionic conductivity of 0.23 mS/cm with a low activation energy for lithium-ion transport, as well as the high capacitance of approximately 10 μF/cm2 based on the metal–insulator–metal configuration. Furthermore, an all-solid-state supercapacitor containing two IGPE coating-activated carbon electrodes produced using our poly(dimethylsiloxane) (PDMS) stamping method exhibited high energy and power densities (44 W h/kg at 875 W/kg and 28 kW/kg at 3 W h/kg). It was also found that this supercapacitor showed a dramatic reduction (more than 50%) of the current–resistance (IR) drop, which is an indicator of low interface resistance, while maintaining the initial electrochemical performance even after severe mechanical deformation such as bending or rolling. Therefore, all these results support the fact that our developed PDMS stamping method enables the rendering of a high-performance ion gel polymer thin-film-based electrolyte with acceptable stability and mechanical flexibility for all-solid-state wearable energy storage devices.

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“…Also, its structural defect severely limits the further improvement of the electrochemical performance of electrode materials. Recent studies have found that metal sulfides have better electrical conductivity than metal oxides, which provides a route for improving oxides or hydroxides. − Nickel–cobalt sulfide (NiCo 2 S 4 ) has low resistivity and rich Faraday reaction. − Also, various electrode materials with excellent morphology can be prepared by different methods. For instance, Li et al prepared hierarchical NiCo 2 S 4 @Co(OH) 2 nanotube arrays supported on nickel foam through a facile and commendable method .…”

Section: Introductionmentioning

confidence: 99%

Sulfur-Doped Nickel–Cobalt Double Hydroxide Electrodes for High-Performance Asymmetric Supercapacitors

Shi

Zhu

et al. 2020

ACS Appl. Energy Mater.

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In this work, an effective strategy was proposed to improve the electrochemical performance of nickel–cobalt layered double hydroxide (NiCo-LDH) by controlling the sulfur doping. The prepared NiCo-LDH material with a 7.5% mol S dopant compared to LDH (NiCo-LDH-S7.5) possesses a unique nanosheet spherical structure, so it can expose more active sites and make better contact with the electrolyte. The synthesized NiCo-LDH-S7.5 has an outstanding specific capacitance of 2417.7 F g–1 at 1 A g–1. Meanwhile, the sulfur dopant significantly improves the electrical conductivity of the electrode material, enhancing the rate performance of the electrode. When the current density increases from 1 to 20 A g–1, the electrode retains a specific capacitance of 81.8%. In addition, we also manufactured an asymmetric supercapacitor using NiCo-LDH-S7.5 and activated carbon as positive and negative electrodes, respectively. Also, it exhibits an exceptionally high energy density of 73.54 Wh kg–1 at a power density of 375 W kg–1 and excellent cyclic stability (90.19% performance remained after 5000 cycles at 2 A g–1). The supercapacitor has been tested to power 88 LEDs (∼2 V) in series, indicating great potential for practical application.

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MnO2@KCu7S4 NWs hybrid compositions for high-power all-solid-state supercapacitor

Cited by 34 publications

References 43 publications

A Biodegradable Gel Electrolyte for Use in High-Performance Flexible Supercapacitors

A Biodegradable Gel Electrolyte for Use in High-Performance Flexible Supercapacitors

Highly Flexible and Stable Solid-State Supercapacitors Based on a Homogeneous Thin Ion Gel Polymer Electrolyte Using a Poly(dimethylsiloxane) Stamp

Sulfur-Doped Nickel–Cobalt Double Hydroxide Electrodes for High-Performance Asymmetric Supercapacitors

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