Quasi-solid-state gel polymer electrolyte for a wide temperature range application of acetonitrile-based supercapacitors

Yong, Hansol; Park, Habin; Jung, Cheolsoo

doi:10.1016/j.jpowsour.2019.227390

Cited by 33 publications

(14 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[32,33] As shown in Figure 3c, as the lithium salt concentration increases, the peak of the free DMF molecules (red peak, 663 cm À 1 ) gradually disappear, and the peak of the solvated DMF (blue peak, 676 cm À 1 ) gradually increases, indicating the formation of solvent-separated-ion-pair (SSIP) (Figure 3d left). [34] In SSIP, the interaction between Li(DMF) 4 + solvation sphere and TFSI À anion is relatively weak, which is also reflected in the SÀ NÀ S peak of the TFSI À anion. There are almost no changes of the SÀ NÀ S peak in the low salt concentration of 1-2 mol L À 1 .…”

Section: Resultsmentioning

confidence: 99%

“…With the rapid development of electric vehicles and portable wearable electronic devices, the demand for energy storage devices such as lithium-ion batteries and supercapacitors is increasing. [1][2][3][4][5][6] Electrolyte, as an important part of energy storage devices, has attracted great attention. Currently, most electrolytes used in energy storage devices are a combination of organic liquids (an organic ester or ether) and a lithium salt.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flame‐Retardant, Highly Conductive, and Low‐Temperature‐Resistant Organic Gel Electrolyte for High‐Performance All‐Solid Supercapacitors

Wang

Yang

et al. 2021

ChemSusChem

View full text Add to dashboard Cite

Traditional liquid electrolytes are volatile, flammable, and easy to leak, which makes the energy storage device easy to burn and explode in the case of overcharge and short circuit. Here, by utilizing the active PÀ H bond of a flame retardant (DOPO) to graft onto the polymer chain, flame-retardant organic gel electrolytes were fabricated to address these issues. The gel electrolyte had good ionic conductivity of 4 mS cm À 1 at 20°C and good flame retardant ability. By changing the molar ratio of the monomers and the salt concentrations, the mechanical strength of the gel electrolyte could be adjusted (maximum stress � 28 KPa, maximum strain � 305 %). The transport mecha-nism of lithium ions in the gel polymer electrolyte was proposed. The gel electrolyte-assembled supercapacitor (SC) possessed better electrochemical properties than that of SC assembled by liquid electrolyte. Importantly, the gel-based SC remained basically unchanged under multiple bending cycles. Additionally, the gel electrolyte had good low-temperature tolerance (0.1 mS cm À 1 at À 40°C). The gel electrolyte-assembled SC could work normally in the temperature range of À 20 to 60°C. The multiple advantages of gel electrolyte expand the applications in ionic conductor and energy storage devices.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flame‐Retardant, Highly Conductive, and Low‐Temperature‐Resistant Organic Gel Electrolyte for High‐Performance All‐Solid Supercapacitors

Wang

Yang

et al. 2021

ChemSusChem

View full text Add to dashboard Cite

show abstract

“…Rct normally involves the charge transfer process stem from redox-active materials. However, in AC supercapacitors, many studies found the Rct exists too [24,28,29]. Since the pseudocapacitance in the activated carbon is insignificant, the Rct is mainly dominated by the adsorption/desorption of ions, or in other words, pore accessibility [29].…”

Section: Evaluation and Optimization Of Gpementioning

confidence: 99%

“…Compared with liquid electrolytes, gel polymer electrolytes composed of the same liquid electrolytes typically show lower ionic conductivity because the polymer matrix impedes free ion movement [23,24], which affects the rate capability of supercapacitors. The rate performance of GPE supercapacitors can hardly exceed that of liquid-electrolyte supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Coherent Integration of Organic Gel Polymer Electrolyte and Ambipolar Polyoxometalate Hybrid Nanocomposite Electrode in a Compact High-Performance Supercapacitor

2022

View full text Add to dashboard Cite

We report a gel polymer electrolyte (GPE) supercapacitor concept with improved pathways for ion transport, thanks to a facile creation of a coherent continuous distribution of the electrolyte throughout the electrode. Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) was chosen as the polymer framework for organic electrolytes. A permeating distribution of the GPE into the electrodes, acting both as integrated electrolyte and binder, as well as thin separator, promotes ion diffusion and increases the active electrode–electrolyte interface, which leads to improvements both in capacitance and rate capability. An activation process induced during the first charge–discharge cycles was detected, after which, the charge transfer resistance and Warburg impedance decrease. We found that a GPE thickness of 12 μm led to optimal capacitance and rate capability. A novel hybrid nanocomposite material, formed by the tetraethylammonium salt of the 1 nm-sized phosphomolybdate cluster and activated carbon (AC/TEAPMo12), was shown to improve its capacitive performance with this gel electrolyte arrangement. Due to the homogeneous dispersion of PMo12 clusters, its energy storage process is non-diffusion-controlled. In the symmetric capacitors, the hybrid nanocomposite material can perform redox reactions in both the positive and the negative electrodes in an ambipolar mode. The volumetric capacitance of a symmetric supercapacitor made with the hybrid electrodes increased by 40% compared to a cell with parent AC electrodes. Due to the synergy between permeating GPE and the hybrid electrodes, the GPE hybrid symmetric capacitor delivers three times more energy density at higher power densities and equivalent cycle stability compared with conventional AC symmetric capacitors.

show abstract

“…[35][36][37] In addition, organic electrolytes, such as acetonitrile or propylene carbonate can only be operated at temperatures below 60 °C and produce safety issues at high temperatures. [38][39][40][41] In this regard, ionic liquids (ILs) have attracted much attention because of their large voltage window, negligible vapor pressure, flammability, and high thermal stability, which make ILs promising electrolytes for the construction of high-temperature supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

In Situ Growing BCN Nanotubes on Carbon Fibers for Novel High‐Temperature Supercapacitor with Excellent Cycling Performance

Liang

Shi

et al. 2021

Small

View full text Add to dashboard Cite

communication stations of switching 5G signal are inevitable. In that case, supercapacitors that can work at high temperatures must be explored to expand the application range and improve equipment security. However, studies on the development of high-temperature supercapacitors are few because of several challenges, such as: poor cycling stability of the electrode material at high temperature and low boiling point of the electrolyte. [11][12][13] Therefore, supercapacitors operating at high temperatures impose strict requirements on materials and electrolytes.Carbon-based supercapacitors have elicited extensive attention because of their rapid charge/discharge rate, high electrical conductivity, and good thermostability. [14][15][16][17][18][19][20] Extensive effort has been exerted to obtain high-temperature, carbon-based supercapacitors with improved the performance. For example, Yury et al. reported on wide range of temperature supercapacitors based on active carbon (AC). By adjusting the size and shape of AC, the double-layer capacitors could be operated in a wide range of temperature from −100 to 60 °C. [21] Bao et al. reported an all-solid-state planar with activated graphene as the cathode; the planar showed excellent electrochemical performance and safety at 80 °C. [22] However, the cycling stability was unsatisfactory, and the inherent low energy density of pure carbon resulted in a limited application. Motivated by this challenging issue, researchers have conducted studies to improve the electrochemical property. Recent research has shown that the doping of nitrogen (N), boron (B), phosphorus (P), sulfur (S), and fluorine (F) heteroatoms in carbon frame can improve the stability and energy density of carbon materials. [23][24][25][26][27] For example, Feng et al. reported graphene aerogels with N and B doping; the aerogels showed an enhanced energy density of 8.65 W h kg −1 and improved cycling stability close to 100% after 1000 cycles. [28] Our previous work also proved that the introduction of B and N can alter the electrostatic attraction of materials, thereby expanding the operating voltage window to 4.8 V and resulting in a high energy density of 200 Wh kg −1 . [29] Furthermore, the inserted B and N in C lattice structures can effectively improve the charge density and activate the C electron around B and N. [30] Carbon nanomaterials have elicited much research interest in the energy storage field, but most of them cannot be used at high temperatures. Thus, a supercapacitor with high energy and desired stability at high temperatures is urgently required. Herein, BCN nanotubes (BCNNTs) with excellent performance at high temperatures are generated on carbon fibers by optimizing the ratio of B and N. The nanotubes' morphology can effectively alleviate the structural damage caused by the rapid adsorption/ desorption of the electrolyte during long-time charge/discharge cycles at high temperatures, thus improving the high-temperature cycle stability. The symmetric supercapacitors that are assembled with...

show abstract

Quasi-solid-state gel polymer electrolyte for a wide temperature range application of acetonitrile-based supercapacitors

Cited by 33 publications

References 52 publications

Flame‐Retardant, Highly Conductive, and Low‐Temperature‐Resistant Organic Gel Electrolyte for High‐Performance All‐Solid Supercapacitors

Flame‐Retardant, Highly Conductive, and Low‐Temperature‐Resistant Organic Gel Electrolyte for High‐Performance All‐Solid Supercapacitors

Coherent Integration of Organic Gel Polymer Electrolyte and Ambipolar Polyoxometalate Hybrid Nanocomposite Electrode in a Compact High-Performance Supercapacitor

In Situ Growing BCN Nanotubes on Carbon Fibers for Novel High‐Temperature Supercapacitor with Excellent Cycling Performance

Contact Info

Product

Resources

About