Application of electrospun polyimide-based porous nano-fibers separators in ionic liquid electrolyte for electrical double-layer capacitors

Wang, Zhenzhen; Zhang, Bing; Weng, Xin; Yu, Xiaodong; Liu, Xia; He, Tieshi

doi:10.1016/j.polymer.2022.124945

Cited by 5 publications

(2 citation statements)

References 40 publications

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“…The distortion effect was particularly pronounced at higher scan rates. This effect may be attributed to the gradual intrusion of the ohmic resistance for ion motion in the pores, or even in the bulk phase, at higher scan rates [ 28 , 32 , 33 ]. In particular, the presence of ohmic-resistance results in a potential gradient, which decreases the capacitance of the electrodes at high charge-storage rates.…”

Section: Resultsmentioning

confidence: 99%

Electrospun Benzimidazole-Based Polyimide Membrane for Supercapacitor Applications

Wang

Tsai

et al. 2022

Membranes

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A benzimidazole-containing diamine monomer was prepared via a simple one-step synthesis process. A two-step procedure involving polycondensation in the presence of aromatic dianhydrides (4,4′-oxydiphthalic anhydride, ODPA) followed by thermal imidization was then performed to prepare a benzimidazole-based polyimide (BI-PI). BI-PI membranes were fabricated using an electrospinning technique and were hot pressed for 30 min at 200 °C under a pressure of 50 kgf /cm2. Finally, the hot-pressed membranes were assembled into supercapacitors, utilizing high-porosity-activated water chestnut shell biochar as the active material. The TGA results showed that the BI-PI polymer produced in the two-step synthesis process had a high thermal stability (Td5% = 527 °C). Moreover, the hot-press process reduced the pore size in the BI-PI membrane and improved the pore-size uniformity. The hot-press procedure additionally improved the mechanical properties of the BI-PI membrane, resulting in a high tensile modulus of 783 MPa and a tensile strength of 34.8 MPa. The cyclic voltammetry test results showed that the membrane had a specific capacitance of 121 F/g and a capacitance retention of 77%. By contrast, a commercial cellulose separator showed a specific capacitance value of 107 F/g and a capacitance retention of 49% under the same scanning conditions. Finally, the membrane showed both a small equivalent series resistance (Rs) and a small interfacial resistance (Rct). Overall, the results showed that the BI-PI membrane has significant potential as a separator for high-performance supercapacitor applications.

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Section: Resultsmentioning

confidence: 99%

Electrospun Benzimidazole-Based Polyimide Membrane for Supercapacitor Applications

Wang

Tsai

et al. 2022

Membranes

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“…Separators, as an indispensable part of SCs, are mainly employed to prevent short circuits caused by the direct contact of electrodes and ensure the rapid transport of ions without influencing the stability of electrolytes under charge/discharge conditions, which are critical for SCs to maintain excellent performance. 5,6 Commonly used separators for SCs are usually divided into four categories, namely, cellulose separators, [7][8][9] polymer separators, [10][11][12] electrospinning separators, [13][14][15] and biological separators. [16][17][18] Among them, cellulose separators are highly favored because of their merits of low cost, high porosity and good saturation rates.…”

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confidence: 99%

Dielectric Modified Separators for High-Voltage and High-Rate Supercapacitors

Bai¹,

Li²,

Yuan³

et al. 2022

J. Electrochem. Soc.

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Widening the operational voltage window of electrolytes has long attracted researchers’ attention as an effective solution for improving the energy density of supercapacitors (SCs). However, the application of commercial cellulose separators in SCs under high voltage is impeded because of the hygroscopic property of hydroxyl functional groups and high self-discharges. Herein, the dielectric materials poly(vinylidene fluoride-co-hexafluoropropylene) PVDF-HFP and TiO2 are employed to modify the surfaces of cellulose separators, which has improved the rate (100% capacitance retention at 20 A g−1) and cyclic (over 83% capacitance retention after 10000 cycles) performance of SCs significantly. In addition, the OVW of the organic electrolyte is widened from 2.7 to 3.8 V. The possible mechanism underlying the function of dielectric materials in SCs is discussed by establishing a model and performing inferential calculation.

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Introducing hydrophilic cellulose nanofiber as a bio-separator for “water-in-salt” based energy storage devices

Deerattrakul

Sakulaue

Bunpheng

et al. 2023

Electrochimica Acta

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Application of electrospun polyimide-based porous nano-fibers separators in ionic liquid electrolyte for electrical double-layer capacitors

Cited by 5 publications

References 40 publications

Electrospun Benzimidazole-Based Polyimide Membrane for Supercapacitor Applications

Electrospun Benzimidazole-Based Polyimide Membrane for Supercapacitor Applications

Dielectric Modified Separators for High-Voltage and High-Rate Supercapacitors

Introducing hydrophilic cellulose nanofiber as a bio-separator for “water-in-salt” based energy storage devices

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