Das, Solanky and Mondal, Dhananjoy and Bardhan, Souravi and Roy, Shubham and Chanda, Dipak Kr and Maity, Anupam and Dutta, Subhojit and Mukherjee, Kamalakanta and Das, Kaustuv (2022) Particle size mediated investigation of various physicochemical properties of kaolinite clay for fabricating the separator layer of green capacitors. Journal of Materials Science-Materials in Electronics, 33 (9). pp. 7119-7133. ISSN 0957-4522

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Abstract

This article reports size fractionation of a natural clay namely kaolinite for fabricating cost-effective green separator material for energy storage devices. kaolinite is reportedly biocompatible and abundantly available in nature, which makes it cost-effective. Such a low-cost clay is found to be in the nano regime when treated in a ball-milling machine for a prolonged duration (12 h). The enhancement in porosity and surface area have also been observed in the treated nano-clay, which subsequently renders it's dielectric constant (similar to 5000 at 40 Hz frequency) remarkably. Henceforth, it can be argued that crystallinity and aspect ratio (S/V) has a prominent impact on the electrical properties of this natural clay. Cyclic voltammetry and galvanostatic charging-discharging measurements depict high specific capacitance (similar to 185 F g(-1)) in the nano-clay sample without the presence of any redox peak making it a good separator material. The slow electrical discharge rate also approves the storage property of this clay sample quite effectively. Abundance, augmented permittivity with a relatively low tangent loss, high specific capacitance and significant resistivity through the material make this nano-clay material a promising `green' dielectric separator for energy storage applications.

Item Type:	Article
Subjects:	Structural Clay Products Electronics
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	29 Aug 2023 10:25
Last Modified:	29 Aug 2023 10:25
URI:	http://cgcri.csircentral.net/id/eprint/5440

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