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Multi-component Olivine for Lithium-Ion Hybrid Capacitor

Minakshi, Manickam and Duraisamy, Shanmughasundaram and Tirupathi, Penki Rao and Kandhasamy, Sathiyaraj and Nookala, Munichandraiah (2014) Multi-component Olivine for Lithium-Ion Hybrid Capacitor. In: INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE, 9 (11). pp. 5974-5992.

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A lithium-ion hybrid capacitor comprising of a battery type multi-component olivine (LiMn1/3Co1/3Ni1/3PO4) cathode and a capacitive type carbon negative electrode is reported. Olivine phosphate synthesized with chelating agent's polyvinylpyrrolidone (PVP) or triethanolamine (TEA) showed uniform carbon coating through in-situ process exhibiting a surface area 5.1 m(2)/g with porosity 0.02 cm(3)/g. The surface area for commercial carbon electrode was observed to be 1450 m(2)/g with high porosity 0.76 cm(3)/g. Galvanostatic charge/discharge cycling tests were conducted in the coin cells, olivine vs. Li, offering a cell voltage of 4.75 V vs. Li with a maximum specific capacitance of 125 F/g. In the case of olivine vs. carbon in a lithium-ion hybrid device delivered a high discharge capacitance of 86 F/g at a specific current of 0.12 A/g with a cycling retention of 53 F/g (38% loss) after 250 cycles. The obtained performance of PVP synthesized olivine material is manifested to uniform carbon coating and the trapped organic products that provide pathways for facile electrochemical reactions than their TEA counterparts.

Item Type: Journal Article
Publisher: ESG
Additional Information: Copyright for this article belongs to the ESG, BORIVOJA STEVANOVICA 25-7, BELGRADE, 11000, SERBIA
Keywords: Olivine; Lithium-ion; Hybrid; Capacitor; Polymer; Carbon; Porosity
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 29 Dec 2014 05:01
Last Modified: 29 Dec 2014 05:01
URI: http://eprints.iisc.ac.in/id/eprint/50532

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