The possible use of polymer gel electrolytes in nickel/metal hydride battery

Iwakura, Chiaki

doi:10.1016/s0167-2738(02)00092-9

Cited by 127 publications

(74 citation statements)

References 9 publications

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“…The degree of network formation depends upon the pH and ionic strength of the medium and also the type of counter ion and functional charge-density of the polymer. 46 Iwakura et al 83,84 have prepared PAAK-KOH-H 2 O hydrogel electrolyte and subsequently employed them in Ni/MH batteries. Iwakura et al, 85 Nohara et al, 86 and Wada et al 87,88 have reported ECs employing alkaline cross-linked potassium poly(acrylate) hydrogel, namely PAAK-KOH-H 2 O, as electrolyte and compared the performance with an EC employing 10 M KOH aqueous electrolyte; the performances of the ECs are found to be similar.…”

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confidence: 99%

Hydrogel-polymer electrolytes for electrochemical capacitors: an overview

Choudhury

Sampath

Shukla

2009

Energy Environ. Sci.

379

260

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Electrochemical capacitors are electrochemical devices with fast and highly reversible charge-storage and discharge capabilities. The devices are attractive for energy storage particularly in applications involving high-power requirements. Electrochemical capacitors employ two electrodes and an aqueous or a non-aqueous electrolyte, either in liquid or solid form; the latter provides the advantages of compactness, reliability, freedom from leakage of any liquid component and a large operating potential-window. One of the classes of solid electrolytes used in capacitors is polymer-based and they generally consist of dry solid-polymer electrolytes or gel-polymer electrolyte or composite-polymer electrolytes. Dry solid-polymer electrolytes suffer from poor ionic-conductivity values, between 10 À8 and 10 À7 S cm À1 under ambient conditions, but are safer than gel-polymer electrolytes that exhibit high conductivity of ca. 10 À3 S cm À1 under ambient conditions. The aforesaid polymer-based electrolytes have the advantages of a wide potential window of ca. 4 V and hence can provide high energy-density. Gel-polymer electrolytes are generally prepared using organic solvents that are environmentally malignant. Hence, replacement of organic solvents with water in gel-polymer electrolytes is desirable which also minimizes the device cost substantially. The water containing gel-polymer electrolytes, called hydrogel-polymer electrolytes, are, however, limited by a low operating potential-window of only about 1.23 V. This article reviews salient features of electrochemical capacitors employing hydrogel-polymer electrolytes.

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confidence: 99%

Hydrogel-polymer electrolytes for electrochemical capacitors: an overview

Choudhury

Sampath

Shukla

2009

Energy Environ. Sci.

379

260

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“…Reportedly, organic PGEs have been used in both lithium batteries 5 and electrochemical double-layer capacitors ͑EDLC͒. 33,34 have found applications in nickel-metal hydride batteries and EDLCs. However, an aqueous PGE suitable to acidic, alkaline and neutral environments is lacking in the literature.…”

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Cross-Linked Polymer Hydrogel Electrolytes for Electrochemical Capacitors

Choudhury

Shukla

Sampath

et al. 2006

J. Electrochem. Soc.

108

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Acidic polyvinyl alcohol/polyacrylic acid blend hydrogel electrolytes ͑BHEs͒ were prepared by cross-linking with glutaraldehyde and perchloric acid. These acidic BHEs were treated suitably to realize alkaline and neutral BHEs. Amorphicity of BHEs was followed by differential scanning calorimetry. Ionic conduction in acidic BHEs was found to take place by a Grötthus-type mechanism whereas in alkaline and neutral BHEs it was due to a segmental motion mechanism. Ionic conductivity of BHEs was found to range between 10 −3 and 10 −2 S cm −1 . Electrochemical capacitors assembled with acidic polyvinyl alcohol hydrogel electrolyte yielded a maximum capacitance of ϳ60 and 1000 F g −1 with BP carbon and RuO x ·xH 2 O/C electrodes, respectively.

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“…Iwakura et al firstly prepared a polymer hydrogel electrolyte (PHE) in which a KOH aqueous solution was held in a network structure of the cross-linked potassium poly(acrylate) (PAAK). They found that the PHE had liquidlike ionic conductivity, and applied it to all solid state Ni-MH batteries [8][9][10]. Inoue et al developed a clay-based inorganic hydrogel electrolyte using hydrotalcite (HT) and KOH aqueous solution, and clarified that it had ionic conductivity comparable to the PHE [11].…”

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confidence: 99%

Preparation and Characterization of Organic-Inorganic Hybrid Hydrogel Electrolyte Using Alkaline Solution

et al. 2011

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Organic-inorganic hybrid hydrogel electrolytes were prepared by mixing hydrotalcite, cross-linked potassium poly(acrylate) and 6 M KOH solution. The organicinorganic hybrid hydrogel electrolytes had high ionic conductivity (0.456-0.540 S cm −1 ) at 30 °C. Moreover, the mechanical strength of the hydrogel electrolytes was high enough to form a 2-3 mm thick freestanding membrane because of the reinforcement with hydrotalcite.

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The possible use of polymer gel electrolytes in nickel/metal hydride battery

Cited by 127 publications

References 9 publications

Hydrogel-polymer electrolytes for electrochemical capacitors: an overview

Hydrogel-polymer electrolytes for electrochemical capacitors: an overview

Cross-Linked Polymer Hydrogel Electrolytes for Electrochemical Capacitors

Preparation and Characterization of Organic-Inorganic Hybrid Hydrogel Electrolyte Using Alkaline Solution

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