Electrochemical characteristics of new electric double layer capacitor with acidic polymer hydrogel electrolyte

Wada, Hajime; Kumiko, Yoshikawa; Nohara, Shinji; Furukawa, N.; Inoue, Hiroshi; Sugoh, Nozomu; Iwasaki, Hideharu; Iwakura, Chiaki

doi:10.1016/j.jpowsour.2005.11.073

Cited by 81 publications

(52 citation statements)

References 10 publications

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“…In the present MnO 2 -based ECs, Mn ions in the range of 0.1-0.5 ppm were detected in the liquid electrolytes, presumably dissolved by dispropornation reaction [6,8]. The leakage current might thus be related to the shuttle reaction of the impurity of Mn ions, and the similar restraineddiffusion model as suggested by Wada et al [21] might also be operative in the present case to cause reduction in leakage current.…”

Section: Resultssupporting

confidence: 76%

“…7 shows the change in current necessary to maintain the cell at 0.8 V. The leakage current in the gel electrolyte is in fact lower than that in 1 M KCl liquid electrolyte. Significant reduction in leakage current when liquid electrolyte is replaced with a gel one has also been noted in the RuO 2 -based ECs by Wada et al [21] and Ni-metal hydride batteries by Iwakura et al [22]. The mechanisms of self-discharge for ECs reported in the literature mainly include the shuttle reaction of impurity metal ions in electrolytes, short-circuit of electrode materials (e.g.…”

Section: Resultsmentioning

confidence: 85%

“…carbon) penetrating the separator, and so on. In the study by Wada et al [21], the leakage current was attributed to the shuttle reaction of impurity Fe ions, and the use of the gel electrolyte, in replacing the liquid electrolyte counterpart, was suggested to restrain diffusion of the impurity ions and hence suppress the leakage current. In the present MnO 2 -based ECs, Mn ions in the range of 0.1-0.5 ppm were detected in the liquid electrolytes, presumably dissolved by dispropornation reaction [6,8].…”

Section: Resultsmentioning

confidence: 99%

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Manganese oxide electrochemical capacitor with potassium poly(acrylate) hydrogel electrolyte

Lee

2008

Journal of Power Sources

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

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Manganese oxide electrochemical capacitor with potassium poly(acrylate) hydrogel electrolyte

Lee

2008

Journal of Power Sources

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“…Gel polymer electrolytes (GPE) Nagatomo et al, 1987;Peramunage et al, 1995) are capable of giving sufficient rigidity for enhancing device safety and provide much higher ionic conductivity than the polymeric solid electrolytes. There has recently been increasing interest in applying GPE to Ecs (Wada et al, 2004;Wada et al, 2006;Choudhury et al, 2006). More recently, a gel-type electrolyte has been tentatively applied in MnO 2 -based systems.…”

Section: Solid Electrolytesmentioning

confidence: 99%

Nanostructured MnO2 for Electrochemical Capacitor

Xu¹,

Bao²

2011

Energy Storage in the Emerging Era of Smart Grids

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“…6-11 By swelling with an aqueous solution, the gel electrolyte showed high conductivity, leading to high specific capacity. [6][7][8][9] In either case, the all-solid-state capacitors were not operated at high temperature because the organic polymers generally show low thermal stability and the electrolyte solutions evaporate at high temperatures. However, inorganic materials generally have thermal stability.…”

mentioning

confidence: 99%

All-Solid-State Electric Double-Layer Capacitor Using Ion Conductive Inorganic–Organic Hybrid Membrane Based on 3-Glycidoxypropyltrimethoxysilane

Aoki

Tadanaga

Tatsumisago

2010

Electrochem. Solid-State Lett.

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An all-solid-state electric double-layer capacitor was fabricated with an inorganic-organic hybrid membrane from 3-glycidoxypropyltrimethoxysilane, tetraethoxysilane, and orthophosphoric acid as an electrolyte, and activated carbon fiber cloth as polarized electrodes. The electrochemical properties of the capacitor were studied in a temperature range from room temperature to 100°C. The specific capacitance of the capacitor was 41 F/g at 100°C with 12% relative humidity, and the capacitor showed good cycle performance.Electric double-layer capacitors ͑EDLCs͒ have recently attracted attention because of their practical applications as energy storage devices for memory backups, electric vehicles, and other devices. [1][2][3][4][5][6][7][8][9][10][11] Typical EDLCs are composed of two polarized electrodes and a liquid electrolyte. 1-3 The use of a liquid electrolyte causes some disadvantages such as electrolyte leakage, solvent corrosion, packing difficulty, and less compactness. To overcome these disadvantages, replacing a liquid electrolyte with a solid or gel electrolyte is proposed. In addition, the operation at high temperatures is required. However, the EDLCs using a liquid electrolyte are unable to operate at high temperatures because of volatilization of the solvent. By using a solid or gel electrolyte, the operation at high temperatures would be possible. Thus, all-solid-state capacitors have been strongly desired in recent years. All-solid-state capacitors were investigated during the past decades. 4-11 For example, Staiti et al. fabricated an all-solid-state EDLC using Nafion as a solid electrolyte. 4,5 The characteristics of the capacitor were studied in a voltage window of 0-1 V. The cyclic voltammograms were almost rectangular, and the charge-discharge curves were linear, suggesting the ideal capacitive behavior. A gel electrolyte impregnated with an aqueous or organic electrolyte solution in an organic polymer matrix was also used. 6-11 By swelling with an aqueous solution, the gel electrolyte showed high conductivity, leading to high specific capacity. [6][7][8][9] In either case, the all-solid-state capacitors were not operated at high temperature because the organic polymers generally show low thermal stability and the electrolyte solutions evaporate at high temperatures. However, inorganic materials generally have thermal stability.We have fabricated all-solid-state EDLCs using acid-doped inorganic silica gels as an electrolyte and activated carbon powders hybridized with the gels as polarized electrodes, and the capacitance of these all-solid-state capacitors was comparable to that of the capacitors with liquid electrolytes. 12-14 However, these gels were obtained as powders and have poor shaping ability. The use of organic polymer components should contribute to changing these gel powders to flexible membranes. We have reported that proton conductive inorganic-organic hybrid membranes from 3-glycidoxypropyltrimethoxysilane ͑GPTMS͒, tetraethoxysilane ͑TEOS͒, and phosphoric acid were flexible and s...

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Electrochemical characteristics of new electric double layer capacitor with acidic polymer hydrogel electrolyte

Cited by 81 publications

References 10 publications

Manganese oxide electrochemical capacitor with potassium poly(acrylate) hydrogel electrolyte

Manganese oxide electrochemical capacitor with potassium poly(acrylate) hydrogel electrolyte

Nanostructured MnO2 for Electrochemical Capacitor

All-Solid-State Electric Double-Layer Capacitor Using Ion Conductive Inorganic–Organic Hybrid Membrane Based on 3-Glycidoxypropyltrimethoxysilane

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