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High-Capacity Layered-Spinel Cathodes for Li-Ion Batteries

Nayak, Prasant Kumar and Levi, Elena and Grinblat, Judith and Levi, Mikhael and Markovsky, Boris and Munichandraiah, N and Sun, Yang Kook and Aurbach, Doron (2016) High-Capacity Layered-Spinel Cathodes for Li-Ion Batteries. In: CHEMSUSCHEM, 9 (17). pp. 2404-2413.

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Official URL: http://dx.doi.org/10.1002/cssc.201600576

Abstract

Li and Mn-rich layered oxides with the general structure xLi(2)MnO(3)(1-x)LiMO2 (M=Ni, Mn, Co) are promising cathode materials for Li-ion batteries because of their high specific capacity, which may be greater than 250mAhg(-1). However, these materials suffer from high first-cycle irreversible capacity, gradual capacity fading, limited rate capability and discharge voltage decay upon cycling, which prevent their commercialization. The decrease in average discharge voltage is a major issue, which is ascribed to a structural layered-to-spinel transformation upon cycling of these oxide cathodes in wide potential ranges with an upper limit higher than 4.5V and a lower limit below 3V versus Li. By using four elements systems (Li, Mn, Ni, O) with appropriate stoichiometry, it is possible to prepare high capacity composite cathode materials that contain LiMn1.5Ni0.5O4 and LixMnyNizO2 components. The Li and Mn-rich layered-spinel cathode materials studied herein exhibit a high specific capacity (200mAhg(-1)) with good capacity retention upon cycling in a wide potential domain (2.4-4.9V). The effect of constituent phases on their electrochemical performance, such as specific capacity, cycling stability, average discharge voltage, and rate capability, are explored here. This family of materials can provide high specific capacity, high rate capability, and promising cycle life. Using Co-free cathode materials is also an obvious advantage of these systems.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 07 Dec 2016 05:14
Last Modified: 07 Dec 2016 05:14
URI: http://eprints.iisc.ac.in/id/eprint/55485

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