Cobalt-free spinel�layered structurally integrated Li0.8Mn0.64Ni0.183Fe0.091O2 cathodes for lithium-ion batteries

Enale, H and Surendran, A and Thottungal, A and Sarapulova, A and Punetha, P and Thankappakurup, S and Dixon, D and Nukala, P and Nishanthi, ST and Knapp, M and Bhaskar, A (2024) Cobalt-free spinel�layered structurally integrated Li0.8Mn0.64Ni0.183Fe0.091O2 cathodes for lithium-ion batteries. In: Journal of Energy Storage, 100 .

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Abstract

Cobalt-free, Li-rich layered-spinel structurally integrated positive electrode (cathode) materials for lithium-ion batteries (LIBs), with nominal composition 0.6(Li1.2Mn0.56Fe0.08Ni0.16O2)�0.4(LiFe0.2Mn1.4Ni0.4O4) which can otherwise be written as Li0.8Mn0.64Ni0.183Fe0.091O2 (FeSL) are synthesized via simple citric acid-assisted sol-gel route. Four different final annealing temperatures (550 °C, 650 °C, 750 °C, and 850 °C) were chosen to investigate their influence on electrochemical performance. The obtained composite materials contain spinel (space group Fd3¯m) as well as Li-rich layered phases (space group C2/m) as revealed by X-ray diffraction (XRD), HRTEM and cyclic voltammetry investigations. The excellent electrochemical performance of the composite material could be attributed to the structural stability achieved by the integration of spinel and layered components. Selected synthesized composite materials exhibit high discharge capacities close to 200 mAh g�1. The FeSL750 shows better capacity retention (92(3) at the 50th cycle and 82(5) at the 70th cycle) and rate capability than the FeSL550 and FeSL650 samples. However, the FeSL850 sample shows different charge-discharge behaviour. The charge capacity corresponding to FeSL850 is found to increase up to the 20th cycle, then stabilizes and displays a capacity retention of almost 100 at the 50th cycle and 91(1) at the 70th cycle. The electrochemical mechanism of FeSL750 was elucidated via in operando XAS investigations, which reveal electrochemical activity from all transition metals. © 2024 Elsevier Ltd

Item Type:	Journal Article
Publication:	Journal of Energy Storage
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Publisher.
Keywords:	Cobalt; Layered semiconductors; Manganese alloys; Manganese compounds; Sol-gel process, Cobalt free; Composites material; Fe-containing; High capacity; High-capacity; In operando XAS; Ion batteries; Operando; Positive electrodes; Spinel-layered, Cyclic voltammetry
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	20 Sep 2024 09:45
Last Modified:	20 Sep 2024 09:45
URI:	http://eprints.iisc.ac.in/id/eprint/86112

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