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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

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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 °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.

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Acknowledgments

The authors thank Renault Nissan Technology and Business Centre India Pvt. Ltd. for financial support, and Dr. Subramani and Dr. Arockia Vimal for helpful discussions. The authors also thank Dr. C. Shivakumara for his help in analysis of XRD patterns.

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  1. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India

    Tirupathi Rao Penki, D. Shanmughasundaram & N. Munichandraiah

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  1. Tirupathi Rao Penki
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  2. D. Shanmughasundaram
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  3. N. Munichandraiah
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Correspondence to N. Munichandraiah.

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Penki, T.R., Shanmughasundaram, D. & Munichandraiah, N. Polymer template-assisted microemulsion synthesis of large surface area, porous Li2MnO3 and its characterization as a positive electrode material of Li-ion cells. J Solid State Electrochem 17, 3125–3136 (2013). https://doi.org/10.1007/s10008-013-2221-1

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  • DOI: https://doi.org/10.1007/s10008-013-2221-1

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