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Polymer template-assisted microemulsion synthesis of large surface area, porous Li2MnO3 and its characterization as a positive electrode material of Li-ion cells

Penki, Tirupathi Rao and Shanmughasundaram, D and Munichandraiah, N (2013) Polymer template-assisted microemulsion synthesis of large surface area, porous Li2MnO3 and its characterization as a positive electrode material of Li-ion cells. In: JOURNAL OF SOLID STATE ELECTROCHEMISTRY, 17 (12, SI). pp. 3125-3136.

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Official URL: http://dx.doi.org/10.1007/s10008-013-2221-1

Abstract

Lithium-rich manganese oxide (Li2MnO3) is prepared by reverse microemulsion method employing Pluronic acid (P123) as a soft template and studied as a positive electrode material. The as-prepared sample possesses good crystalline structure with a broadly distributed mesoporosity but low surface area. As expected, cyclic voltammetry and charge-discharge data indicate poor electrochemical activity. However, the sample gains surface area with narrowly distributed mesoporosity and also electrochemical activity after treating in 4 M H2SO4. A discharge capacity of about 160 mAh g(-1) is obtained. When the acid-treated sample is heated at 300 A degrees C, the resulting porous sample with a large surface area and dual porosity provides a discharge capacity of 240 mAh g(-1). The rate capability study suggests that the sample provides about 150 mAh g(-1) at a specific discharge current of 1.25 A g(-1). Although the cycling stability is poor, the high rate capability is attributed to porous nature of the material.

Item Type: Journal Article
Additional Information: copyright for this article belongs to SPRINGER USA
Keywords: Lithium-ion cell; Mesoporous; Lithium excess manganese oxide; Microemulsion route; Polymer template; High rate capability
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 19 Dec 2013 10:17
Last Modified: 19 Dec 2013 10:17
URI: http://eprints.iisc.ac.in/id/eprint/47942

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